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Product Description
LM2596S DC-DC step-down power module 3A adjustable step-down module LM2576 super regulator
Dense vias, heat and strong!
Increase in the input and output terminals respectively X7R high-Q high frequency bypass capacitor, electromagnetic compatibility super!
Input voltage range: DC 3.2V to 35V (input voltage must be higher than the voltage output to 1.5V or more can not be boosted.)
Output Voltage Range: 1.25V to 30V DC voltage is continuously adjustable, high efficiency (maximum 92% ) of the maximum output current of 3A.
Found 12V input, load regulation 5V 1A output current is lower than 1%
Note: The input and output can not be reversed, reverse might burn chips;
This is a step-down module, the input voltage is higher than the required output voltage;
Output 2A or less long period of time without additional heat sink output current is greater than 2.5A (or output power greater than 10W) to work long hours please add heat sink.
Electrical parameters:
Input: DC 3.2V to 35V (input voltage must be more than the output voltage can not be higher than boost 1.25v.)
Output: 1.25V to 30V DC voltage is continuously adjustable, high efficiency and maximum output current of 3A.
Features: All solid capacitors using SANYO, 36u thick circuit boards, high-Q inductors with high power output LED indicator
Size: 41 (L) * 20 (W) * 14 (H) mm (including potentiometers) Taobao minimum with locating hole with LED indicator DC-DC

Instructions:
Access to power (3-35V), adjust the blue potentiometer knob (clockwise rotation generally boost, buck counterclockwise rotation) and with a multimeter to monitor the output voltage reaches the required voltage.

Wiring:
1. welding, welded directly to the power line input (output) port;
2. solder pins, or pins can be inserted through the lead insertion use in tunnel plate; soldered directly to the PCB after another or add pins.
Application examples:
1. The vehicle power supply, only need to enter this module termination point the car cigarette power supply, you can adjust the potentiometer, the output voltage can be adjusted in 1.25-30V, for your phone, MP3, MP4, PSP charging many devices powered, very simple and convenient.
2. The power to the electronic device when the device needs 3-30V power supply voltage corresponding to the hand while using this module you can easily put the voltage to the desired voltage and solve problems.
3. The system voltage test can be used to make this project a variety of debugging module voltage test system operating voltage range, very easy and convenient.

Description:
This is a breakout board for the Silicon Laboratories Si4703 FM tuner chip. Beyond being a simple FM radio, the Si4703 is also capable of detecting and processing both Radio Data Service (RDS) and Radio Broadcast Data Service (RBDS) information. The Si4703 even does a very good job of filtering and carrier detection. It also enables data such as the station ID and song name to be displayed to the user.


Using this board we are able to pick up multiple stations just as well as with a standard FM radio.
The board breaks out all major pins and makes it easy to incorporate this great chip into your next radio project. Also, by plugging headphones into the 3.5mm audio jack,
you effectively use the cable in your headphones as an antenna!
Therefore, this board does not require an external antenna if using headphones or
a 3.5mm audio cable longer than 3 feet.


Package Included:

1 x Breakout Board Si4703 FM RDS Tuner For AVR ARM PIC

Product Description
The MH-ET LIVE Tiny88(16.0Mhz) based microcontroller development board similar to the arduino line, only cheaper, smaller, and a bit less powerful. With the ability to use the familiar arduino IDE the MH-ET LIVE Tiny88(16.0Mhz) is a great board to jump into electronics, or perfect for when an other board is too big or too much.The MH-ET LIVE Tiny88(16.0Mhz) is shipped fully assembled except for the headersincluded and easy to solder them by yourself.
Specs:
Support for the arduino IDE 1.0 (OSX/Win/Linux)
1. Power via USB or External Source - 5v or 7-35v (12v or less recommended,
automatic selection)
2. On-board 500ma 5V Regulator
3. Built-in USB
4. 26 I/O Pins (2 are used for USB only if your program actively communicates over USB, otherwise you can use all 6 even if you are programming via USB)
5. 8k Flash Memory (about 6k after bootloader)
6. I2C and SPI
7. 26-PWM (26 pins with Software PWM,only two(D9,D10) with hardware PWM )
8. ADC on 8 pins
9. Power LED and Test/Status LED
10. Size(mm):44.5x18.3x3
PinOut:
Installation Instructions:
First download the appropriate arduino package at the Arduino.cc website: http://www.arduino.cc/en/Main/Software
If using Arduino 1.6.6 or higher and windows - you will need to download and install the drivers manually. Download, unzip and run “Install Drivers” (on 32bit systems) or “DPInst64” (on 64bit systems). The driver files are located here: http://github.com/MHEtLive/MHEtLiveArduino/releases/download/1.0.0/
2.0a4.rar
Install or Unzip the arduino application.
Run the arduino application.
In the arduino application go to the “File” menu and select “Preferences”,In the box labeled “Additional Boards Manager URLs” enter:
http://raw.githubusercontent.com/MHEtLive/arduino-boards-index/master/p
ackage_mhetlive_index.json and click OK;
Go to the "Tools" menu, and then in the "Board" sub-menu-select "Board Manager from the Type drop-down list", and then down select "Submission":
Select the "MH-ET LIVE Boards" package and click the "Install" button.
You will see the download progress on the bottom bar of the "Boards Manager" window, and "Installed" will be displayed next to the item in the list after completion.
WINDOWS users: After the installation is complete, a driver installation wizard window will pop up, please click "Next" in this window to install the MH-ET LIVE driver
Boards (if you have already installed them, this installer will update them and install any missing ones).
After the installation is complete, close the "Boards Manager" window and select MH-ET LIVE Boards "MH-ET LIVE Tiny88(16.0Mhz)" from the Tools→Boards menu.
Choose the example that comes with Arduino IDE: select the development board as MH-ET LIVE Tiny88 in the toolbar, open the program in File>> Example>>Basic>>Blink, and change the port 13 in the program to 0. Follow the above method to transplant, compile and download to MH-ET LIVE Tiny88 (16.0Mhz), you can see the onboard LED light flashes according to the prompt
(Note: When downloading the program, do not connect the module first. After the compilation is completed, wait for the prompt to insert the module, then insert it, and wait for the automatic download to complete).

Product Description
PWM DC Motor Speed Controller Switch DC 20A Current Voltage Regulator 10-60V PWM High Power Drive Module 60A 12 V 24 V 36 V 48 V
Product Discription:
Operating voltage: DC 10V-60V
Output Current: 0 to 20A.
Frequency:25KHz.
Continuous power: Max 1200W
Speed range: Motor zero speed to maximum motor speed
The maximum current up to 20A radiator or heat required to increase the fan
Material: Plastic, metal
Size (L*W*H):76mm*44mm*26mm
Package Included:
1 x 20A Universal DC10-60V PWM HHO RC Motor Speed Regulator Controller Switch

Product Description
1 RS422 interface, two-way communication. A B Y Z ultra-long distance transmission 1000 meters
2 The module has 15KV ESD protection.
3 Add a 10 ohm current-limiting and over-current protection resistor on the board.
4 The module has a TVS diode. Anti-lightning and anti-peak voltage.
5 The module has 120 ohm terminal resistance, which can effectively reduce the interference of long-distance communication echo.
6 There is a power indicator light and a data transceiver indicator light. The data status has a panoramic view.
7 Module TTL side Use 5v DC power supply RXD TXD compatible with 5V logic signal.
The 8 module adopts the original imported MAX490 chip, the stability and communication speed far exceed the domestic products, up to 2.5MBPS.
9 Module size: 5.0cm*2.7cm

Introduction
Voltage Supply: 9-12V DC Input
Waveforms: Square, Sine & Triangle
Impedance: 600 Ohm 10%
Frequency: 1Hz - 1MHz
SINE WAVE
Amplitude: 0 - 3V at 9V DC input
Distortion: Less than 1% (at 1kHz)
Flatness: 0.05dB 1Hz - 100kHz
SQUARE WAVE
Amplitude: 8V (no load) at 9V DC input
Rise Time: Less than 50ns (at 1kHz)
Fall Time: Less than 30ns (at 1kHz)
Symmetry: Less than 5% (at 1kHz)
TRIANGLE WAVE
Amplitude: 0 - 3V at 9V DC input
Linearity: Less than 1% (up to 100kHz) 10mA
Feature
The welding installation considerations, follow these steps:
1. The components are welding the front board, from low to high principles, namely the first low welding components, such as, capacitor, resistor, diode, etc.
2.Welding IC socket, terminal blocks, finally power socket, adjustable potentiometer.
3.The back with a diagonal cutting pliers to cut short the pins as far as possible
Debugging steps:
1After completion of welding on IC, XR2206, pay attention to the direction of IC, insert the might damage the chip!
2. check the IC whether against, such as anti please timely correction.
3. Insert the power supply, power supply for 5.5 * 2.1 port, inside outside is negative polarity. For 9-12 v power supply voltage. The waveform may not be stable for more than 12 v
Using the step
1. J1 jumper cap plug in, SIN/TRI blue terminals output sine wave (note J1, J2 can only insert one of)
2. J2 jumper cap plug in, SIN/TRI blue terminals output triangular wave (note J1, J2 can only insert one of)
3. SQU blue terminals output pulse
4. AMP : Sine wave, triangle wave amplitude adjustment
5. FINE : Frequency fine adjustment
6. Coarse : Frequency of coarse adjustment
Schematic diagram of Function Generatorc

1.3 inch OLED 7 Pin
Driver chip SH1106
Support interface SPI
Resolution 128×64
Display size 1.3 inches
Display color: white/blue/
Dimensions 35.5X33.7X1.2(mm)
Glass size 34.5X23X1.45(mm)
Display area 29.42X14.7(mm)
Positive and negative tolerance 0.2mm
Number of needles 7 needles
Viewing angle >160°
Working temperature -40℃~80℃
Storage temperature -45℃~85℃
Working voltage 3.3V / 5V

1.3 inch OLED 4 Pin
Driver chip SH1106
Support interface IIC
Resolution 128×64
Display size 1.3 inches
Display color: white/blue
Dimensions 35.5X33.7X1.2(mm)
Glass size 34.5X23X1.45(mm)
Display area 29.42X14.7(mm)
Positive and negative tolerance 0.2mm
Number of needles 4 needles
Viewing angle >160°
Working temperature -40℃~80℃
Storage temperature -45℃~85℃
Working voltage 3.3V / 5V

1.3 inch OLED 7 Pin
Driver chip SH1106
Support interface SPI
Resolution 128×64
Display size 1.3 inches
Display color: white/blue/
Dimensions 35.5X33.7X1.2(mm)
Glass size 34.5X23X1.45(mm)
Display area 29.42X14.7(mm)
Positive and negative tolerance 0.2mm
Number of needles 7 needles
Viewing angle >160°
Working temperature -40℃~80℃
Storage temperature -45℃~85℃
Working voltage 3.3V / 5V

1.3 inch OLED 4 Pin
Driver chip SH1106
Support interface IIC
Resolution 128×64
Display size 1.3 inches
Display color: white/blue
Dimensions 35.5X33.7X1.2(mm)
Glass size 34.5X23X1.45(mm)
Display area 29.42X14.7(mm)
Positive and negative tolerance 0.2mm
Number of needles 4 needles
Viewing angle >160°
Working temperature -40℃~80℃
Storage temperature -45℃~85℃
Working voltage 3.3V / 5V

1.3 inch OLED 7 Pin
Driver chip SH1106
Support interface SPI
Resolution 128×64
Display size 1.3 inches
Display color: white/blue/
Dimensions 35.5X33.7X1.2(mm)
Glass size 34.5X23X1.45(mm)
Display area 29.42X14.7(mm)
Positive and negative tolerance 0.2mm
Number of needles 7 needles
Viewing angle >160°
Working temperature -40℃~80℃
Storage temperature -45℃~85℃
Working voltage 3.3V / 5V

1.3 inch OLED 4 Pin
Driver chip SH1106
Support interface IIC
Resolution 128×64
Display size 1.3 inches
Display color: white/blue
Dimensions 35.5X33.7X1.2(mm)
Glass size 34.5X23X1.45(mm)
Display area 29.42X14.7(mm)
Positive and negative tolerance 0.2mm
Number of needles 4 needles
Viewing angle >160°
Working temperature -40℃~80℃
Storage temperature -45℃~85℃
Working voltage 3.3V / 5V

1.3 inch OLED 7 Pin
Driver chip SH1106
Support interface SPI
Resolution 128×64
Display size 1.3 inches
Display color: white/blue/
Dimensions 35.5X33.7X1.2(mm)
Glass size 34.5X23X1.45(mm)
Display area 29.42X14.7(mm)
Positive and negative tolerance 0.2mm
Number of needles 7 needles
Viewing angle >160°
Working temperature -40℃~80℃
Storage temperature -45℃~85℃
Working voltage 3.3V / 5V

1.3 inch OLED 4 Pin
Driver chip SH1106
Support interface IIC
Resolution 128×64
Display size 1.3 inches
Display color: white/blue
Dimensions 35.5X33.7X1.2(mm)
Glass size 34.5X23X1.45(mm)
Display area 29.42X14.7(mm)
Positive and negative tolerance 0.2mm
Number of needles 4 needles
Viewing angle >160°
Working temperature -40℃~80℃
Storage temperature -45℃~85℃
Working voltage 3.3V / 5V

Features:
Material: PCB board and electronic components
Color: as shown
Input voltage: 5-40V
Output voltage: 1.2-35V (continuously adjustable)
Output current: 9A (The temperature of the power tube exceeds 65°C, please add a cooling fan)
Constant current range: 0.2-9A (adjustable)
Output power: The maximum power is about 300W (the temperature of the power tube exceeds 65°C, please add a cooling fan)
Size: about 2.55 * 1.88 * 0.94inch / 6.5 * 4.8 * 2.4cm (length * width * thickness)

Features:
Material: PCB board and electronic components
Color: as shown
Input voltage: 5-40V
Output voltage: 1.2-35V (continuously adjustable)
Output current: 9A (The temperature of the power tube exceeds 65°C, please add a cooling fan)
Constant current range: 0.2-9A (adjustable)
Output power: The maximum power is about 300W (the temperature of the power tube exceeds 65°C, please add a cooling fan)
Size: about 2.55 * 1.88 * 0.94inch / 6.5 * 4.8 * 2.4cm (length * width * thickness)

Features
1, using CY7C68013A-56 chip: low-power version of the enhanced 51-core, 16KB program data areas, frequency of 48Mhz, 480Mbps high-speed transmission protocol standards, in line with USB2.0 specification, backward compatible with USB1.1.

2, firmware, EEPROM: Complete in-system programming solution with a USB cable directly to download firmware, on-board to provide 16K (24LC128) a large program memory (EEPROM), used as storage VID / PID and the USB firmware, the program space to meet the CY7C68013A needs.

3, all the GPIO pin through the 2.54mm standard leads to very convenient for learners to expand their own design.

4, with the appropriate board firmware can be achieved through the core function of the logic analyzer

5, PDF format, provide the schematic and the Related information.

Package including
1 xCY7C68013A core board

•High quality rotary electric appliance, stable performance smooth movement
•Output 0 - VCC analog voltage signal
Specification:
1.Size: 26*20mm
2.Weight: 5g
3.Voltage: 3.3V, 5V
4.Port: Analog
5.Resistance: 100K
6.Rotation angle: 270 degrees
7.Platform: Arduino, MCU, ARM, Raspberry Pi

Description
Module nature: non-isolated step-down module (BUCK)
Input voltage: 4-38V (please try not to exceed 38V for input)
Output voltage: 1.25-36V continuously adjustable
Output current: 0-5A
Output power: 75W
Working temperature: -40~ 85 degrees
Working frequency: 180KHz
Conversion efficiency: 96%
Load regulation rate: S (I) ≤ 0.8% (input 24V, output 12V, measured when the load changes from 1 to 4.5A)
Voltage adjustment rate: S (u) ≤ 0.8% (when output 12V, 4A, the voltage is measured from 18~32V)
Power indicator: Yes
Short circuit protection: Yes (limited current 8A)
Over-temperature protection: Yes (automatically shut down the output after over-temperature)
Input reverse connection protection: None, (if necessary, please insert a high-current diode in series in the input)
Installation method: 2 3mm screws
Connection method: welding, V-IN is input, V-OUT is output
Module size: length 54mm width 23mm height 15mm
Application range:
This module can be used in step-down fields where the input voltage is higher than the output voltage, such as batteries, power transformers, DIY adjustable regulated power supplies, 24V car pen-based power supplies, industrial equipment step-down, 12V to 3.3V, 12V to 5V, 24V to 5V, 24V to 12V, 36V to 24V, etc.

First, the parameters:
1. Size: 28.2mm (length) * 13.1mm (width) * 5.5mm (height)
2. Weight: 5g
3. Operating voltage: 3V - 5.5V
4. Sensor Model: DS18B20
5. The signal output format: digital signal
6. Temperature measurement range: -55 'C --125 ‘C
7. Measuring accuracy: 0.5 'C
8. Resolution: 9--12 bits
9. with fixing screw holes for easy installation and fixation. Aperture 2.6mm

Second, the wiring instructions:
" ": Positive power supply
"-": Negative one
"Out": connected microcontroller IO port

Description
Module name: 500W boost constant current module

Module nature: Non-isolated boost module (BOOST)

Input voltage: DC8.5V-48V

Input current: 15A (MAX) over 8A, please strengthen heat dissipation, otherwise it may be damaged
Quiet working current: 10mA (when 12V rises to 20V, the higher the output voltage, the higher the quiescent current will increase)

Output voltage: 10-50V continuously adjustable

Output current: 10A MAX (related to the input and output pressure difference, the greater the pressure difference, the smaller the output current, if the output current exceeds 5A, add a heat sink or fan for heat dissipation)

Constant current range: 0.2-10A

Output power: = input voltage*10A,
such as: input 12V*15A=180W, input 24V*15A=360W,
Input 36V*10A=360W, input 48V*10A=480W,,,
If you need more power, you can use two modules in parallel. For example, if the output is 10A, you can use two modules in parallel and adjust the current of each module to 5A.

Working temperature: -40~ 85 degrees (please strengthen heat dissipation when the ambient temperature is too high)

Working frequency: 150KHz

Conversion efficiency: up to 96% (efficiency is related to input, output voltage, current, and pressure difference)

Overcurrent protection: Yes (output over 10A, automatic protection, there is a certain range of error. The protection mode is to stop the boost, the output still has voltage)

Input reverse connection protection: Yes, (less than 5A, if you need more reverse connection current, please connect a diode in series with the input)

Product application:
DIY a regulated power supply, input 12V, output can be adjusted from 12-50V.

To supply power to your electronic equipment, you can set the output value according to your system voltage.

As a car power supply, it can power your laptop, PDA or various digital products.

DIY a high-power laptop mobile power supply: equipped with a large-capacity 12V lithium battery pack, so that your books can be bright wherever you go.

The solar panel is stabilized.

Charge storage batteries, lithium batteries, etc.

Precautions
Do not adjust the current in a short-circuit method. The circuit structure of the boost module cannot be adjusted in a short-circuit method. Please make sure that the output voltage is greater than the input voltage; when large current output, please ensure good heat dissipation; when the load is large, the module must first be connected to the input Voltage, then connect the load.

Product Description
The PCB Is Red
76-108MHz FM Stereo Radio DIY Kit Wireless FM Receiver Module Frequency Modulation Electronics Soldering Practice Project DC 2.7V-3.3V
Note: Please don't use 18650 battery, if not it will damage the item.
Description:
- The YFM-2 type radio circuit is very simple.
- The total number of components does not exceed 19.
- Although the number of components is not large, it includes two types of components: SMD and DIP which are suitable for novices and friends who want to practice soldering of SMD components.
Features:
1>.Built-in digital automatic gain control (AGC) circuit
2>.Support the global frequency band 76-108Mhz
3>.DIY manual welding
4>.Simple and easy to operate
5>.Support radio memory function
Parameter:
1>.Item name: FM Stereo Radio Module DIY Kit
2>.Item Mode:YFM-2
3>.Work Voltage:DC 3V
4>.Work Current:19mA
5>.Work Frequency:76-108Mhz
6>.Output impedance:32ohm
7>.Work Temperature:-40℃~85℃
8>.Work Humidity:0% ~95% RH
9>.Size(Installed):57*32*20mm
Applicable:
1>.Training welding skills
2>.Student school
3>.DIY production
4>.Project Design
5>.Electronic competition
6>.Graduation design
7>.Crafts collection
8>.Home decoration
9>.Souvenir collection
Installation Tips:
1>.User needs to prepare the welding tool at first.
2>.Please be patient until the installation is complete.
3>.The package is DIY kit.It need finish install by user.
4>.The soldering iron can't touch the components for a long time(1.0 second), otherwise it will damage the components.
5>.Pay attention to the positive and negative of the components.
6>.Strictly prohibit short circuit.
7>.Install complex components preferentially.
8>.Make sure all components are in right direction and right place.
9>.It is strongly recommended to read the installation manual before starting installation!!!
Installation Steps(Please be patient install!!!):
1>.Step 1: Install 1pcs SOP-16 RDA5807PF at U1.There is a dot on one corner of the IC and there is a rectangle pad on PCB where the Pin1 of IC can place on.These two marks are corresponding to each other and are used to specify the installation direction of the IC.
2>.Step 2: Install 1pcs 30K ohm Resistor at R1.
3>.Step 3: Install 1pcs 0.1uH Inductor at L1.
4>.Step 4: Install 2pcs 1uH Inductor at L2,L3.
5>.Step 5: Install 1pcs 32.768KHz Crystal Oscillator at Y1.
6>.Step 6: Install 1pcs 24pF Ceramic Capacitor at C1.
7>.Step 7: Install 1pcs 0.01pF(103) Ceramic Capacitor at C2.
8>.Step 8: Install 1pcs 0.022pF(223) Ceramic Capacitor at C3.
9>.Step 9: Install 5pcs 6*6*5mm Switch at S1-S5.
10>.Step 10: Install 1pcs 100uF 16V Electrolytic Capacitor at C4,C5. Please pay attention to the positive and negative poles. The shorter pin is the negative pole.
11>.Step 11: Install 1pcs 3.5mm Audio Jack at J1.
12>.Step 12: Connect battery box.Pay attention to positive and negative.
13>.Step 13: Use a cable tie to fasten the battery box.
14>.Step 14: Connect to power supply and enjoy the effect.

Features:
100% Brand new and high quality.
Material: Electronic components PCB
Size: About 31 * 19 * 29mm / 1.22" * 0.75" * 1.14"
Main color: Black
Working voltage: 5V
Pulse circle: 20
By rotating the rotary encoder can be counted in the positive direction and the reverse direction during rotation of the output pulse frequency, unlike rotary potentiometer count, this rotation counts are not limited. With the buttons on the rotary encoder can be reset to its initial state, that starts counting from 0.


Package Included:

5 x Rotary Encoder Module Brick Sensor Development Board

Product Description
Stereo Bluetooth Digital Amplifier Board
Amplifier chip: YDA138
Operating voltage: 8.5~14VDC (power input with polarity protection)
Recommended power supply: 12V DC current 2A
Output power: 2X10W (8 ohms), 15W 15W (4 ohms)
Output impedance: 4~10 Ohm
Specifications Model: SW-HF187
Size:40x60mm
weight:14g



Packaging:

1pcs × YDA138 Bluetooth Amplifier Board Module

Description:
100% brand new and high quality
Material: Electrical components
Color: See pictures
HW-586 battery capacity tester discharge type 1.2-12V external load capacity of the battery and other tests 18650
Tools, single-function, by controlling the load off and get real-time integrated discharge current capacity results
Maximum support 15V 3A discharged through the discharge voltage and current, itself does not discharge
Maximum capacity statistics support 9999Ah (9999000mAh)
Automatically identify and develop appropriate battery termination voltage can also be manually adjusted
Specifications:
Power supply voltage: DC4.5-6V (micro USB connector)
Operating Current: less than 70mA
Discharge voltage: 1.00V-15.00V 0.01V resolution
Termination voltage range: 0.5-11.0V
Supported by current: 3.000A 0.001A resolution
Maximum voltage measurement error: 1% 0.02V
Maximum current measurement error: 1.5% - 0.008A
Maximum battery capacity range: 9999Ah (1Ah = 1000mAh) greater value by shifting the decimal point to switch, when the display is less than 10Ah X.XXX, as shown above to achieve 10Ah XX.XX, and so on.
Board size: 50mmX37mm
Finished Size: 50mmX37mmX17mm (length X width X height maximum position size, contains copper foot height)
Instructions:
1. The first test should be fully charged battery.
2. Connect the battery to be tested positive to positive input, a negative input to the negative, can not be reversed (with load reversal may damage the circuit)! Load connected to the output of the positive and negative output, to work through the tester micro USB power supply (not available desktop or laptop USB powered), then the battery voltage.
3. Direct start test need only one press of the "OK" button, the tester can automatically develop an appropriate termination voltage of the battery full charge voltage, and will start flashing after the test three times. Need to develop artificial termination voltage only when the battery voltage display state by pressing " " or "-" buttons to modify the termination voltage display beginning with P, behind the representative voltage resolution 0.1V, set up after pressing the "OK "start testing.
4. After the start of the test the tester will control the load of the electronic switch is turned on, the test data shows that the process will release capacity (Ah), current discharge current (A) and battery voltage (V) between the wheel was. When the battery voltage reaches the set cut-off voltage, load control switches off the tester display data stays in capacity (Ah) and above and the corresponding indicator flashes quickly together, now displays the actual capacity of the battery is discharging capacity, about the press "OK" to terminate flashing allows stable data display, press again "OK" button to return to the power-on state can just replace the battery test the next section ......
Error codes and their meanings:
Err1: battery voltage is above 15V
Err2: battery voltage is lower than the termination voltage
Err3: Battery can not afford to load or discharge current line too much resistance
Err4: overcurrent (current exceeds 3.1A)
Note:
Use the resistance of the discharge process, resistive load will seriously heat, please pay attention to safety!
This circuit voltage in order to improve the measurement accuracy, specially designed DC bias, when the terminal displays nothing then a small voltage does not affect the actual measurement, if you are shorting the input terminals (absolute 0V) will show 0
No retail package
Quantity:1Pc
Note: Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thank you!!
Package Included:
1Pc x battery capacity tester
2Pc x Load resistors

Product Description
Onboard 8P-chip carrier, can support AT24C256 series chips;
Pin power supply, on-board power indicator;
on-board pull-up resistor for I2C communications required ;
All pins leads out and be marked, the address input and the write-protect pin direct jumper settings;
PCB board size: 36.5 (mm) x12 (mm)

Product Description
Onboard 8P-chip carrier, can support AT24C256 series chips;
Pin power supply, on-board power indicator;
on-board pull-up resistor for I2C communications required ;
All pins leads out and be marked, the address input and the write-protect pin direct jumper settings;
PCB board size: 36.5 (mm) x12 (mm)

Product Description
Onboard 8P-chip carrier, can support AT24C256 series chips;
Pin power supply, on-board power indicator;
on-board pull-up resistor for I2C communications required ;
All pins leads out and be marked, the address input and the write-protect pin direct jumper settings;
PCB board size: 36.5 (mm) x12 (mm)

Product Description
Onboard 8P-chip carrier, can support AT24C256 series chips;
Pin power supply, on-board power indicator;
on-board pull-up resistor for I2C communications required ;
All pins leads out and be marked, the address input and the write-protect pin direct jumper settings;
PCB board size: 36.5 (mm) x12 (mm)

Product Description
Onboard 8P-chip carrier, can support AT24C256 series chips;
Pin power supply, on-board power indicator;
on-board pull-up resistor for I2C communications required ;
All pins leads out and be marked, the address input and the write-protect pin direct jumper settings;
PCB board size: 36.5 (mm) x12 (mm)

Product Description
Onboard 8P-chip carrier, can support AT24C256 series chips;
Pin power supply, on-board power indicator;
on-board pull-up resistor for I2C communications required ;
All pins leads out and be marked, the address input and the write-protect pin direct jumper settings;
PCB board size: 36.5 (mm) x12 (mm)

Product Description
Onboard 8P-chip carrier, can support AT24C256 series chips;
Pin power supply, on-board power indicator;
on-board pull-up resistor for I2C communications required ;
All pins leads out and be marked, the address input and the write-protect pin direct jumper settings;
PCB board size: 36.5 (mm) x12 (mm)

Product Description
Onboard 8P-chip carrier, can support AT24C256 series chips;
Pin power supply, on-board power indicator;
on-board pull-up resistor for I2C communications required ;
All pins leads out and be marked, the address input and the write-protect pin direct jumper settings;
PCB board size: 36.5 (mm) x12 (mm)

Product Description
After the output voltage (any value of 1.25V-26V) is determined, it has nothing to do with the input voltage (input any value of 3.5V-28V), and the module will automatically increase and decrease the voltage.
Adapt to solar panels! Brand new masterpiece! ! Wide voltage DC-DC buck-boost module
LM2577S LM2596S dual chip!
Appearance size length * width * height 5.3cm*3.8cm*1.5cm (with fixed column)
Boost mode: input 3.5-28V output 1.25V-26V
The output voltage has nothing to do with the input voltage (input any value of 3.5V-28V, output any value of 1.25V-26V)
Buck mode:
The current input is three amps, and the output is three amps.
Rated input 1A, output 1A
Note: Because the switching frequency is low, the inductor will have some high-frequency noise when the input current is large, which does not affect the use

Feature:
Onboard two the L9110S motor control chip
the module can simultaneously drive two DC motors or a 4-wire 2-phase stepper motor
the 800mA continuous current output capability per channel
Low static work current
Each channel has 800mA continuous current output
Low saturation pressure drop
TTL/CMOS output level compatible, can be connected directly to the CPU
Output built-in clamping diode, apply to the perceptual load
Control and drive integrate in IC
Have pin high pressure protection function
Specifications:
Working temperature: 0-80 °
Size:29.2(mm)x23(mm)
the module input voltage :2.5-12V
Power supply voltage: DC2.5-12V
Package includes:
1x L9110S H-bridge Stepper Motor Dual DC motor Driver Controller Board

Product Description
1. Description:
This product is a stereo Bluetooth amplifier module. The Bluetooth version is 4.2.
2. Features:
1>. The version is 4.2. It can be compatible with all mobile phones and Bluetooth adapters on the market.
2>. The distance is 15 meters in open space.
3>. It supports automatically connecting devices that have been paired and playing music automatically.
4>. F class power amplifier 5W 5W, high power output, over 8002 sound quality.
5>. It supports USB sound card, no drive, plug and play.
6>. Good sound quality, suitable for upgrading and refitting the idle sound box and DIY production.
3. Instructions:
1>. Support USB sound card, free drive, plug and play (normal lithium battery power supply situation).
2>. This product has dual 5W power amplifier circuit. It can not be used in addition to the power amplifier. The output of two amplifiers can not be connected in parallel or connected to the negative electrode, otherwise the power amplifier chip will be damaged.
3>. There are two 2-8 European and 3-10W speakers respectively, and 3 European 5W and 4 European 10W horn are used. The output is stereo.
4>. Maximum working current is 5V 2A, using 5V 2A or more voltage power supply, sound quality will be better.
5>.It is suggested that a 3.7-5V lithium battery (the lithium battery needs a protective plate! It can charge a lithium battery with a USB rechargeable battery, and the USB port can not be used as a power supply port.) or a 5V adapter be used for power supply. It can not use voltage and current unstable power supply, such as dry battery, portable charger, multi-function transformer and so on.
6>. When the Bluetooth board is installed, the antenna should not be close to the metal parts so as not to affect the transmission distance.
4. Operation:
Start the cell phone Bluetooth, scan the device, find the "DW-CT14 " to click connection.
5. Note:
The charging interface of this product is a current limiting charging mode without charge management. For your safety, be sure to use a regular lithium-ion battery with a protective plate, which can cause loss due to improper use.
6. Package list:
Main board plug line

Parameter :
Shot : 1/4 5M
Aperture : 2.9
Focal length : 3.29
FOV : 65 degree
Sensor type : OmniVision OV5647 Color CMOS QSXGA (5-megapixel)
Sensor size : 3.67 x 2.74 mm (1/4" format)
Pixel Count : 2592 x 1944
Pixel Size : 1.4 x 1.4 um
Lens : f=3.6 mm, f/2.9
Angle of View : 54 x 41 degrees
Field of View : 2.0 x 1.33 m at 2 m
Full-frame SLR lens equivalent: 35 mm
Fixed Focus : 1 m to infinity
Video : 1080p at 30 fps with codec H.264 (AVC)
Up to 90 fps Video at VGA
Board size : 25 x 24 mm (not including flex cable)
Support Raspberry Pi 3 Model B

Package include
25*1N4148 switching signal Doide DO-35
25*1N4007 1A 1000V Rectifier Diode DO-41
10*1N5819 1A 40V SCHOTTKY DIODE DO-41
10*1N5399 1.5A 1000V 4.8W Rectifier Diode DO-15
10*FR107 Fast Recovery Diodes FR107 1A 1000V DO-41
10*FR207 2A 1000V Fast Recovery Diodes DO-41
5*1N5408 Diode Rectifier 3.0 amp 1000V DO-201AD
5*1N5822 40V 3A SCHOTTKY DIODE DO-201AD

Specifications as follows:
2pF         3pF        5pF       10pF     15pF     22pF
30pF      33pF       47pF     68pF     75pF   82pF
100pF    150pF      220pF   330pF   470pF   680pF
1nF         1.5nF      2.2nF    3.3nF     4.7nF   6.8nF
10nF       15nF       22nF     47nF      68nF   100nF
each 10pcs

Description:
Input Voltage: DC 3V-35V
Output Voltage: DC 4V-40V (continuously adjustable)
Efficiency: 94% (MAX)
Size:L37mm*W32mm*H15mm
Working Temperature: -40°- 85°
Load capacity:Max 80W
The way of Connection: the connection terminal is does not need to be welded, the "IN" is the input,
and the "OUT" is the output.
Note:
When the output voltage is closer to the output voltage,the carrying capacity is higher,and the efficiency is
also higher.Package included: 1PCS DC-DC Adjustable Step-up Boost Power Supply Module
Package included:
1*3V 5V 12V to 19V 24V 30V 36V Adjustable DC-DC 1A Step Up Power Supply Module

Description:
Size: 5mm/3mm
Length: 37mm.
Emitted Colour : Infrared.
Lens Color : Black/Clear.
wavelength: 940nm.
Forward Voltage (V) : 1.2-1.4V.
Forward Current (mA): 100mA.
Transmitting and receiving distance: about 7 - 8 M.

Description:
Size: 5mm/3mm
Length: 37mm.
Emitted Colour : Infrared.
Lens Color : Black/Clear.
wavelength: 940nm.
Forward Voltage (V) : 1.2-1.4V.
Forward Current (mA): 100mA.
Transmitting and receiving distance: about 7 - 8 M.

Features:
1. Use with D1 MINI
2. Arduino compatible, use Arduino IDE for programming
3.11XI/O pin
4.1XADC pin (input 0-3.3V)
5. Support OTA online

Delivery list (packed in electrostatic bag):
1. Long female row X2PCS
2. Short header X2PCS
3. Ordinary pin header X2PCS
4. DS18B20 temperature measurement module (FOR D1-MINI) X1PCS
Shipping list:
1.Long female pins x2pcs

2.Short female pins x2pcs

3.Normal pins x2pcs
4.DS18B20 Shield x1pcs
Pin definition (DS18B20 temperature measurement module VCC and GND are connected to the D1 MINI motherboard, and the occupied data IO port is D2)

Description:
Plug and play, easy to use. Compatible with the mainstream 2.54 interfaces and 4-Pin Grove interfaces in the market.
With use of M4 standard fixed holes, compatible with M4-standard kits such as Lego and Makeblock.
Specifications:
PCB size 33.0mm X 14.0mm X 1.6mm
Working voltage 5V DC
Operating voltage 5V DC
Compatible interfaces 2.54 3-pin interface and 4-pin Grove interface(1)
Note 1: S for digital output port, N for not used pin, V and G for voltage at the common collector and ground respectively. When there is no operation, digital output is VDD; when the button is pressed down, the digital output is 0V.
Electrical characteristics:
Parameter Min. Typical Max. Unit
Working voltage 4.5 5 5.5 VDC
Digital output voltage(VCC=5V) 0 - 5 V
Working current(5V)
- 260 - uA
Frequency range 100 - 10000 Hz
Sensitivity - -50 - dB
DEMO:
1const int ledPin = 13; // the number of the LED pin
2const int thresholdvalue=400; //The threshold to turn the led on
3void setup() {
4pinMode(ledPin, OUTPUT);
5}
6void loop() {
7 int sensorValue = analogRead(A0); //use A0 to read the electrical signal
8 if(sensorValue>thresholdvalue)
9digitalWrite(ledPin,HIGH); //if the value read from A0 is larger than 400,then light the LED
10 delay(200);
11 digitalWrite(ledPin,LOW);

description
This tiny board is designed based on VS1053B . VS1053 is a versatile MP3 codec processor that is capable of decoding a variety of music formats,including Ogg Vorbis/MP3/AAC/WMA/MIDI audio. For the best headphone listening experience, the VS1053 includes EarSpeaker spatial processing which accurately simulates how a room with stereo loudspeakers would sound. In addition to being able to decode all major formats, VS1053 is capable of recording in Ogg Vobis file.

With the SD card slot on the other side of the board, you can play mp3 files from SD card using this breakout. It is easily to drop it in your project or make a mp3 player using your For Arduino or other microcontroller.

Features

Can play a variety of music formats, support for OGG encoding real-time recording
SPI interface, the control signal lines are led out
A headphone and stereo output
A microphone for recording
A line_in input interface

Power indicator

3.3V and 2.8V of LDO chip AMS-1117 on board, provides up to 800mA current
A single power supply: 5 VDC
12.288 Mhz crystal
SD card slot

Decodes formats Ogg Vorbis

MP3 = MPEG 1 & 2 audio layer III (CBR VBR ABR)
MP1 & MP2 = MPEG 1 & 2 audio layers I & II optional
MPEG4 / 2 AAC-LC( PNS), HE-AAC v2 (Level 3) (SBR PS)
WMA4.0/4.1/7/8/9 all profiles (5-384 kbps)
FLAC lossless audio with software plugin (upto 24 bits, 48 kHz)
WAV (PCM IMA ADPCM)
General MIDI 1 / SP-MIDI format 0
Encodes formats from mic/line Ogg Vorbis with software plugin
IMA ADPCM
16-bit PCM

Product Description
Power supply:3v-5v
MMA8452 module, high-precision tilt sensor module 14BIT-digit
Mounting hole diameter: 3mm
Pitch: 15mm
Size: Approx. 14.5mm x 20.5 mm /0.57''x0.80''
Package Included:
1 x GY-45 MMA8452 Digital Triaxial Accelerometer Tilt Sensor Module

The AHT10, a new generation of temperature and humidity sensors, sets a new standard in size and intelligence: it is embedded in a dual-row flat leadless SMD package for reflow soldering with a 4 x 5mm bottom and a height of 1.6mm. The sensor outputs a calibrated digital signal in standard I 2C format. The AHT10 is equipped with a newly designed ASIC-specific chip, an improved MEMS semiconductor capacitive humidity sensing element and a standard on-chip temperature sensing element. Its performance has been greatly improved beyond the reliability level of previous generation sensors. The first generation of temperature and humidity sensors have been improved to make them more stable in harsh environments.
Characteristic:
1. Module size: 16*11 mm
2. Interface type: I2C
3. Working voltage: 1.8 - 6.0 V
4. Interface size: 4*2.54mm pitch
5. Humidity accuracy: typical ± 2%
6. Humidity resolution: 0.024%
7. Temperature accuracy: typical ± 0.3 ° C
8. Temperature resolution: Typical 0.01 °C
9. Working temperature: -40°C--85°C

Product Description
1. Signal voltage at the drive end: 3.6-24V
2. Output voltage range: 3.6-30V (The output current depends on the specific situation but not 10MA, the total power is certain, and the voltage and current are inversely proportional)
3. The jumper cap can realize whether the output terminal is high-potential output or pull-down output.
4. The 4 817 channels on the board are all independent, which can realize simultaneous control of different voltages, etc.
5: Board size: length: 48mm; width: 38mm; long side hole distance: 42mm; wide side hole distance: 32mm
When encountering the need for isolation control and voltage conversion in actual work, this module will be used.
It can realize 3.3V or 5V control 3.6---24V voltage level interface. After the control terminal is turned on, the controlled terminal will also be turned on.
The photoelectric isolation has strong anti-interference ability. Later, it can drive high-power transistors, MOS tubes and other occasions that require high-voltage drive, and can also directly drive low-power 24V relays to work.
If it is a pulse signal, please note that the limit of 817 is below 4KHZ, please do not use this module for control signals greater than 4KHZ, it will not work properly.

Product Description
1. Signal voltage at the drive end: 3.6-24V
2. Output voltage range: 3.6-30V (The output current depends on the specific situation but not 10MA, the total power is certain, and the voltage and current are inversely proportional)
3. The jumper cap can realize whether the output terminal is high-potential output or pull-down output.
4. The 4 817 channels on the board are all independent, which can realize simultaneous control of different voltages, etc.
5: Board size: length: 48mm; width: 38mm; long side hole distance: 42mm; wide side hole distance: 32mm
When encountering the need for isolation control and voltage conversion in actual work, this module will be used.
It can realize 3.3V or 5V control 3.6---24V voltage level interface. After the control terminal is turned on, the controlled terminal will also be turned on.
The photoelectric isolation has strong anti-interference ability. Later, it can drive high-power transistors, MOS tubes and other occasions that require high-voltage drive, and can also directly drive low-power 24V relays to work.
If it is a pulse signal, please note that the limit of 817 is below 4KHZ, please do not use this module for control signals greater than 4KHZ, it will not work properly.

Product Description
1. Signal voltage at the drive end: 3.6-24V
2. Output voltage range: 3.6-30V (The output current depends on the specific situation but not 10MA, the total power is certain, and the voltage and current are inversely proportional)
3. The jumper cap can realize whether the output terminal is high-potential output or pull-down output.
4. The 4 817 channels on the board are all independent, which can realize simultaneous control of different voltages, etc.
5: Board size: length: 48mm; width: 38mm; long side hole distance: 42mm; wide side hole distance: 32mm
When encountering the need for isolation control and voltage conversion in actual work, this module will be used.
It can realize 3.3V or 5V control 3.6---24V voltage level interface. After the control terminal is turned on, the controlled terminal will also be turned on.
The photoelectric isolation has strong anti-interference ability. Later, it can drive high-power transistors, MOS tubes and other occasions that require high-voltage drive, and can also directly drive low-power 24V relays to work.
If it is a pulse signal, please note that the limit of 817 is below 4KHZ, please do not use this module for control signals greater than 4KHZ, it will not work properly.

Product Description
[SYN115]
On-board single-chip ASK transmitter chip SYN115/F115
The module transmitting frequency: 433MHz
Module output power: <10dBm
The module trans rate: <10kbps
The module supply voltage :1.8-3.6V

[SYN480R]
On-board single-chip wireless SYN480R ASK/OOK receiver chip
The module receiving frequency: 433MHz
Module receiver sensitivity: -107dBm
The module transfer rate: 2.5kbps(SWP), 10kbps (FIXED)
The module supply voltage: 3.3-5.5V

Product Description
[SYN115]
On-board single-chip ASK transmitter chip SYN115/F115
The module transmitting frequency: 433MHz
Module output power: <10dBm
The module trans rate: <10kbps
The module supply voltage :1.8-3.6V

[SYN480R]
On-board single-chip wireless SYN480R ASK/OOK receiver chip
The module receiving frequency: 433MHz
Module receiver sensitivity: -107dBm
The module transfer rate: 2.5kbps(SWP), 10kbps (FIXED)
The module supply voltage: 3.3-5.5V