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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

D1 Mini ESP8266 ESP-12 ESP-12F CH340G CH340 V2 USB WeMos WIFI Development Board D1 Mini NodeMCU Lua IOT Board 3.3V With Pins

D1 Mini ESP8266 ESP-12 ESP-12F CH340G CH340 V2 USB WeMos WIFI Development Board D1 Mini NodeMCU Lua IOT Board 3.3V With Pins

D1 Mini ESP8266 ESP-12 ESP-12F CH340G CH340 V2 USB WeMos WIFI Development Board D1 Mini NodeMCU Lua IOT Board 3.3V With Pins

D1 Mini ESP8266 ESP-12 ESP-12F CH340G CH340 V2 USB WeMos WIFI Development Board D1 Mini NodeMCU Lua IOT Board 3.3V With Pins

D1 Mini ESP8266 ESP-12 ESP-12F CH340G CH340 V2 USB WeMos WIFI Development Board D1 Mini NodeMCU Lua IOT Board 3.3V With Pins

D1 Mini ESP8266 ESP-12 ESP-12F CH340G CH340 V2 USB WeMos WIFI Development Board D1 Mini NodeMCU Lua IOT Board 3.3V With Pins

D1 Mini ESP8266 ESP-12 ESP-12F CH340G CH340 V2 USB WeMos WIFI Development Board D1 Mini NodeMCU Lua IOT Board 3.3V With Pins

D1 Mini ESP8266 ESP-12 ESP-12F CH340G CH340 V2 USB WeMos WIFI Development Board D1 Mini NodeMCU Lua IOT Board 3.3V With Pins

D1 Mini ESP8266 ESP-12 ESP-12F CH340G CH340 V2 USB WeMos WIFI Development Board D1 Mini NodeMCU Lua IOT Board 3.3V With Pins

D1 Mini ESP8266 ESP-12 ESP-12F CH340G CH340 V2 USB WeMos WIFI Development Board D1 Mini NodeMCU Lua IOT Board 3.3V With Pins

D1 Mini ESP8266 ESP-12 ESP-12F CH340G CH340 V2 USB WeMos WIFI Development Board D1 Mini NodeMCU Lua IOT Board 3.3V With Pins

D1 Mini ESP8266 ESP-12 ESP-12F CH340G CH340 V2 USB WeMos WIFI Development Board D1 Mini NodeMCU Lua IOT Board 3.3V With Pins

Description
In various bridge circuit, in order to adjust the bridge balance, the potentiometer must be adjusted many times, can the balance bridge, during use, when the potentiometer is subjected to vibration, shock, temperature, humidity and other external environmental factors, the potential of the location and parameters will change, causing the system to change the index, for the system to reach the status quo, must be adjusted, which caused a lot of inconvenience to use, for the bridge arm circuit using an array of potentiometers and digital technology, not only to overcome the above drawbacks, but also can greatly improve the accuracy of the system. X9C104 100 order digital potentiometer, specifically X9C102 / 103/104/503 series, the resistance in the range of 40R ~ 100K, X9C104 contains 99 internal resistor arrays, there is slid in between each unit and the two endpoints tap access point unit, the position of the slide unit by the CS, U / D and INC three inputs control, but a location is selected, can be stored in non-volatile memory and can be recalled after the power on next time. Digital potentiometer changes are stepped or incremental change in resistance changes linearly. For example X9C104, resistance range 40R ~ 100K, divided into 100 bands, the incremental point for each tap 1010R. Temperature compensation function: resistance error endpoints: ± 20% ; wiper position data can be stored for long periods, the time for 100 years; resistance higher resolution: 1% .

1. Working voltage (V): 5

2. Total resistance (kΩ): 100

3. The terminal voltage (V): -5 ~ 5

4. The number of taps: 100

5. Interface: CS, U / D, INC

6. The increase in resistance mode: Linear

7. Operating Current (mA): 3

8. Package / Temperature ('c): 8SOIC / -40 ~ 85

9. Description: tap position automatic storage

The product features:
1. current: 50A;
2. voltage: 1000V;
3. small pass general-purpose size "vacuum oxygen protection" welding technology;
4. glass passivation diode chip;
5. excellent strength / volume ratio;
6. high thermal conductivity package.
The typical application:
1. rectifier power supply
2. industrial automation and control
3. CNC machinery, remote control system

Features:
Specification:
Material: abs
Model: FT232 B female
Applicable: for Windows system
Type: Module
Size: approx. 3.9*2.9*1.3 cm / 1.5*1.1*0.5 inch

Product Description
Screen Size: 64x48 pixels (0.66” Across)Operating Voltage: 3.3VDriver IC: SSD1306Interface: IIC(I2C)IIC Address: 0x3C or 0x3D

Features:
Sound quality is very good by using this module.
Mono digital audio power amplifier chip.
30W output and low power consumption.
Applicable speaker impedance: 4/6/8 ohm(8 ohm is the best).

Specifications:
Amplifier Chip: TPA3110
Working Voltage: DC 8-26V
Output Power: 1*30W
Applicable Speaker Impedance: 4/6/8 ohm(8 ohms Best)
PCB Board Size: 42 * 30mm / 1.65 * 1.18in
Weight: 10g / 0.35oz

Package List:
1 * TPA3110 PBTL Mono Amplifier Board

Description
1. Function: Use low level to control high level. For example, the 3V or 5V voltage of the single-chip microcomputer is used to control the 9V or 12V voltage.
2. HVCC should not exceed 24V. The output current of the output port OUT1/OUT2/OUT3/OUT4 is equal to HVCC/5.1K, and the absorption current is 500ma.
3. This module uses Toshiba TLP281 chip
4. Schematic diagram:
5. Input and output description:
Input terminal: IN1/IN2/IN3/IN4, connected to the IO port of the microcontroller or arduino, and GND is connected to the GND of the microcontroller or the rrduino development board. IN1/IN2/IN3/IN4 respectively control OUT1/OUT2/OUT3/OUT4.
Output terminal: OUT1/OUT2/OUT3/OUT4
Output terminal: HVCC: connected to the controlled high-voltage positive pole, HGND connected to the controlled high-voltage negative pole
Use: When IN1 is high, the voltage of OUT1 is equal to HVCC, when IN1 is low, the voltage of OUT1 is equal to HGND
6. Examples of use
The following example shows how to use the IO port of the single-chip microcomputer to control the rotation of a 24V motor. The working voltage of the motor in the picture is 24V, the red " " indicates the positive pole of the motor's power supply, and the black "-" indicates the negative pole of the motor's power supply. When the IO_0 port of the single-chip microcomputer outputs high level, the motor rotates, and when the IO_0 port outputs low level, the motor stops rotating.

Description
1. This module complies with international safety standards, and there are isolation slots in the control area and the load area;
2, using genuine relays;
3, with power and relay action instructions, pull-in light, disconnection does not light;
4. When there is a signal at the signal input terminal, the common terminal and the normally open terminal will conduct;
5, can be used as a microcontroller development board module, can be used as home appliance control;
6, control DC or AC signal, can control 220V AC load;
7. There is one normally open and one normally closed contact;
8. The blue KF301 terminal is more convenient to connect to the control line.

Description
1. This module complies with international safety standards, and there are isolation slots in the control area and the load area;
2, using genuine relays;
3, with power and relay action instructions, pull-in light, disconnection does not light;
4. When there is a signal at the signal input terminal, the common terminal and the normally open terminal will conduct;
5, can be used as a microcontroller development board module, can be used as home appliance control;
6, control DC or AC signal, can control 220V AC load;
7. There is one normally open and one normally closed contact;
8. The blue KF301 terminal is more convenient to connect to the control line.

Description
1. This module complies with international safety standards, and there are isolation slots in the control area and the load area;
2, using genuine relays;
3, with power and relay action instructions, pull-in light, disconnection does not light;
4. When there is a signal at the signal input terminal, the common terminal and the normally open terminal will conduct;
5, can be used as a microcontroller development board module, can be used as home appliance control;
6, control DC or AC signal, can control 220V AC load;
7. There is one normally open and one normally closed contact;
8. The blue KF301 terminal is more convenient to connect to the control line.

Product Description
Features: Based on the I2C interface I / O expansion modules, use two I / O scalability eight I / O (up to 8 simultaneous use PCF8574, expanded to 64 I / O)
The most important feature: 1. Support two interface types access target board: Pin or row seat
2. Supports I2C bus cascade (by pin, row seat docking method, which can use multiple I2C modules)
Typical applications: for I / O resources were scarce MCU I / O expansion
The main resource: PCF8574, I2C interfaces, eight parallel

Product Description
This project uses bright infrared (IR) LED and a phototransistor to detect the pulse of the finger, a red LED flashes with each pulse.
Pulse monitor works as follows: The LED is the light side of the finger, and phototransistor on the other side of the finger, phototransistor used to obtain the flux emitted, when the blood pressure pulse by the finger when the resistance of the phototransistor will be slight changed.
We chose a very high resistance resistor R1, because most of the light through the finger is absorbed,it is desirable phototransistor sensitive enough.Resistance can be selected by experiment to get the best results.
The most important is to keep the shield stray light into the phototransistor. For home lighting that is particularly important because the lights at home mostly based 50HZ or 60HZ fluctuate, so faint heartbeat will add considerable noise.

Introduction
1. Color:As pictures
2. Structure:Fixed capacitors
3. Capacitor Length:5mm/0.19''
4. Capacitor Range : 10pf~100nf
5. Capacitor Tolerance: ±10% .
6. Working Voltage: 50V
7. Quantity:300PCS(30PCS in each type)
8. Durable and easy to install
9. Very convenient and practical
10. High precision and stability
11. Very popular among the electronic lovers
12. Many type of metal film resistors assorted,can meet your different demand.
package include:
300 x Electrolytic Capacitor
1 x Plastic Box
10Value Multilayer Ceramic Capacitor Assortment Kit Each 30pcs
10pF 20pF 30pF 47pF 56pF
68pF 100pF 1nF 10nF 100nF

Description
1.Series 3144, hall switch integrated circuit using hall effect principle, USES the semiconductor integrated technology manufacturing magnetic susceptibility of the circuit, it is by the voltage regulator, hall voltage generator, differential amplifier, schmidt triggers, temperature compensation and the open collector output stage circuit composed of magnetic sensitive sensor circuit, its input for the magnetic induction intensity, the output is a digital voltage signal.

2.Hall magnetic sensor module and a digital 13 interface with LED build a simple circuit, to produce a magnetic flasher .Use digital 13 interface with the LED, the Hall magnetic sensor connected to the force plate number 3 ARDUINO interface. When the Hall magnetic sensor to a magnetic field signal , LED lights on, versa lights off.

PAM8403
Product Name: Bluetooth Digital Power Amplifier Board
Product model: XH-A150
Chip model: PAM8403
Transmission distance: up to 20 meters (no blocking)
Supply voltage: 5V (Micro-input)
Color: green
material: metal
Number of channels: 2
Maximum power: 5W 5W
Product net weight: 42g
Product size: 102*69*24mm
Instructions for use:
1. Install the TR18650 battery first, pay attention to the positive and negative points! (Battery is purchased by yourself)
2. Two wire link audio speakers, red is positive, black is negative
3. Insert an SD card with song files in the SD card slot or a USB flash drive with song files inserted in the USB interface.
4. Open the open key, it will automatically read your SD card or USB flash drive, and start playing songs. If the SD card and USB flash drive are installed at the same time, it will read the SD card file and play it by default.
Package Contents:
1* Amplifier Board
Only the above package content, other products are not included.
Note: Light shooting and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is /- 1-3cm.

XH-A153
Reference description:

Product name: Bluetooth audio amplifier board
Function type: Amplify audio
Supply voltage: DC5V
Bluetooth version: 5.0
Chip type: PAM8403*1
Number of channels: two-channel stereo
Output power: 3W× 2
Magnification: 4 times
Appearance size: 93*42*25mm
Installation hole distance: 86*35mm
Product weight: 27g
Package Included:
1 x Bluetooth power amplifier board(without Battery)
2 x 2P connection line

PAM8403
Product Name: Bluetooth Digital Power Amplifier Board
Product model: XH-A150
Chip model: PAM8403
Transmission distance: up to 20 meters (no blocking)
Supply voltage: 5V (Micro-input)
Color: green
material: metal
Number of channels: 2
Maximum power: 5W 5W
Product net weight: 42g
Product size: 102*69*24mm
Instructions for use:
1. Install the TR18650 battery first, pay attention to the positive and negative points! (Battery is purchased by yourself)
2. Two wire link audio speakers, red is positive, black is negative
3. Insert an SD card with song files in the SD card slot or a USB flash drive with song files inserted in the USB interface.
4. Open the open key, it will automatically read your SD card or USB flash drive, and start playing songs. If the SD card and USB flash drive are installed at the same time, it will read the SD card file and play it by default.
Package Contents:
1* Amplifier Board
Only the above package content, other products are not included.
Note: Light shooting and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is /- 1-3cm.

XH-A153
Reference description:

Product name: Bluetooth audio amplifier board
Function type: Amplify audio
Supply voltage: DC5V
Bluetooth version: 5.0
Chip type: PAM8403*1
Number of channels: two-channel stereo
Output power: 3W× 2
Magnification: 4 times
Appearance size: 93*42*25mm
Installation hole distance: 86*35mm
Product weight: 27g
Package Included:
1 x Bluetooth power amplifier board(without Battery)
2 x 2P connection line

Specifications:
Model: XH-M203
Working voltage: AC/DC12V
Output capacity: 10A
Output type: relay output
Control type: full automatic
Size: 6x3.8cm/2.36x1.50inch
Installation: M3 screw hole
Applications: When the water level is higher than the upper line, it will stop to add water automatically, no need for manual management, full automatic. Easy installation, and simple to operate. Widely used in water conservancy project, water tower, water bucket, water tank, water pond, etc
Quantity: 1 Pc
Note:
Please allow 1-3mm error due to manual measurement. pls make sure you do not mind before you bid
Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thank you!

Product Description
This module absolutely adopts original imported chips, and the performance is very good. You can easily get ±12V voltage as long as you have a 3V~5V battery (lithium battery, Ni-MH battery, etc.).
Ultra-small size and easy to install.

Module parameters:
Input voltage range: 2.8V~5.5V
Output voltage: ±12V (V is 12V, V- is -12V)
Output current: 12V can stably output 50ma current capacity, -12V
Stable output current capacity of 30ma, almost meets all
ADC, DAC and amplifier applications.
Size: 2.4*1.2CM
Application: This module can be used as a power supply for ADC, DAC or amplifier, etc.
Electricity. It cannot be used as a power supply for high-power loads.

Note: Due to the voltage divider effect of the diode, the -12V power supply is 0.4-0.6V lower than the 12V power supply.

This module is not a power type, do not connect to a high-power load.

Package include
20pcs RM065 Trimpot Trimmer Potentiometer

Package include
20pcs RM065 Trimpot Trimmer Potentiometer

Package include
20pcs RM065 Trimpot Trimmer Potentiometer

Package include
20pcs RM065 Trimpot Trimmer Potentiometer

Package include
20pcs RM065 Trimpot Trimmer Potentiometer

Package include
20pcs RM065 Trimpot Trimmer Potentiometer

Package include
20pcs RM065 Trimpot Trimmer Potentiometer

Package include
20pcs RM065 Trimpot Trimmer Potentiometer

Package include
20pcs RM065 Trimpot Trimmer Potentiometer

Package include
20pcs RM065 Trimpot Trimmer Potentiometer

Package include
20pcs RM065 Trimpot Trimmer Potentiometer

Package include
20pcs RM065 Trimpot Trimmer Potentiometer

Package include
20pcs RM065 Trimpot Trimmer Potentiometer

Product description:
Parameter:
Chip: TPA3110
Condition:XH-A232
Application:Computer
Supply Voltage:DC8V-26V
Dissipation Power:30W 30W
Size:53*45*14mm
Channels:2 (2.0)
Output impedance:4-8ohm
Current: more than 3A
Signal to noise ratio: 100db
Package ncluded:
1PC TPA3110 Digital Power Audio Amplifier Board

The main function of this module is to reduce the DC voltage in the voltage range of 7～24V to 5V, and output DC 5V stably. It can supply power for single-chip microcomputer and sensor module with 5V DC working voltage.
Features:
(1) Input voltage range: DC 7V～24V.
(2) Maximum current: 1A.
(3) Output voltage: stable output DC 5V.

3 CH LCD display
Specification:
Working voltage: 3.3 ~ 30V
Frequency range: 1Hz ~ 150KHz
Frequency accuracy: the accuracy in each range is about 2%
Signal load capacity: the output current can be about 5 ~ 30ma
Output amplitude: PWM amplitude equal to the supply voltage
Ambient temperature: -20 ~ 70 degree
Features:
LCD display frequency and duty cycle, very clear, PWM output can be set to the frequency and duty cycle.
Wide frequency range, high precision.
Serial communication, TTL level.
Used as a square wave signal generator, generate square wave signal for experimental development and use.
Used to generate a square wave signal that controls the motor driver.
Generate adjustable pulse for MCU use.
Generate adjustable pulse, control the relevant circuit (PWM dimming speed and other applications).
Serial control (single-chip TTL level communication).
Fine workmanship and good performance.
Stable and reliable.
Easy to use.
Long service life.
Frequency is divided into four ranges, automatic switching:
1. XXX (no decimal point): the smallest unit is 1Hz, the value range of 1Hz ~ 999Hz;
2. X.XX (decimal point in the hundred) the smallest unit is 0.01Khz, the range of 1.00Khz ~ 9.99Khz;
3. XX.X (decimal point in ten): the smallest unit is 0.1Khz; value range of 10.0KHz ~ 99.9KHz
4. X.X.X (decimal point in ten and hundred): the smallest unit is 1Khz; value range 1KHz ~ 150KHz
5. e.g. frequency display:
100 indicates PWM output 100Hz pulse;
1.01 indicates PWM output 1.01K pulse;
54.1 indicates that the PWM output has a pulse of 54.1 kHz;
1.2.4 indicates that the PWM output is 124 kHz pulse;
6. Duty cycle range: 0 ~ 100%
Parameter Settings:
The module has four independent keys, used to set the frequency and duty cycle.
Support touch (increase or decrease a unit) and long press (fast increase or decrease).
The parameters automatically save, power down Not lost.
Communication Standard:
9600 bps Data bits: 8
Stop bit: 1
Check digit: none
Flow control: none
1>. set the frequency of the PWM
"F101": Set the frequency to 101 HZ (001 to 999)
"F1.05": set the frequency of 1.05 KHZ (1.00 ~ 9.99)
"F10.5": Set the frequency to 10.5KHZ (10.0 ~ 99.9)
"F1.0.5": set the frequency of 105KHZ (1.0.0 ~ 1.5.0)
2>. set the PWM duty cycle
"DXXX": set the PWM duty cycle to XXX; (001 ~ 100)
Such as D050, set the PWM duty cycle is 50%
3>. read the set parameters
Send a "read" string to read the set parameters.
Set successfully return: DOWN.
Setup failed to return: FALL.

3 CH LCD display
Specification:
Working voltage: 3.3 ~ 30V
Frequency range: 1Hz ~ 150KHz
Frequency accuracy: the accuracy in each range is about 2%
Signal load capacity: the output current can be about 5 ~ 30ma
Output amplitude: PWM amplitude equal to the supply voltage
Ambient temperature: -20 ~ 70 degree
Features:
LCD display frequency and duty cycle, very clear, PWM output can be set to the frequency and duty cycle.
Wide frequency range, high precision.
Serial communication, TTL level.
Used as a square wave signal generator, generate square wave signal for experimental development and use.
Used to generate a square wave signal that controls the motor driver.
Generate adjustable pulse for MCU use.
Generate adjustable pulse, control the relevant circuit (PWM dimming speed and other applications).
Serial control (single-chip TTL level communication).
Fine workmanship and good performance.
Stable and reliable.
Easy to use.
Long service life.
Frequency is divided into four ranges, automatic switching:
1. XXX (no decimal point): the smallest unit is 1Hz, the value range of 1Hz ~ 999Hz;
2. X.XX (decimal point in the hundred) the smallest unit is 0.01Khz, the range of 1.00Khz ~ 9.99Khz;
3. XX.X (decimal point in ten): the smallest unit is 0.1Khz; value range of 10.0KHz ~ 99.9KHz
4. X.X.X (decimal point in ten and hundred): the smallest unit is 1Khz; value range 1KHz ~ 150KHz
5. e.g. frequency display:
100 indicates PWM output 100Hz pulse;
1.01 indicates PWM output 1.01K pulse;
54.1 indicates that the PWM output has a pulse of 54.1 kHz;
1.2.4 indicates that the PWM output is 124 kHz pulse;
6. Duty cycle range: 0 ~ 100%
Parameter Settings:
The module has four independent keys, used to set the frequency and duty cycle.
Support touch (increase or decrease a unit) and long press (fast increase or decrease).
The parameters automatically save, power down Not lost.
Communication Standard:
9600 bps Data bits: 8
Stop bit: 1
Check digit: none
Flow control: none
1>. set the frequency of the PWM
"F101": Set the frequency to 101 HZ (001 to 999)
"F1.05": set the frequency of 1.05 KHZ (1.00 ~ 9.99)
"F10.5": Set the frequency to 10.5KHZ (10.0 ~ 99.9)
"F1.0.5": set the frequency of 105KHZ (1.0.0 ~ 1.5.0)
2>. set the PWM duty cycle
"DXXX": set the PWM duty cycle to XXX; (001 ~ 100)
Such as D050, set the PWM duty cycle is 50%
3>. read the set parameters
Send a "read" string to read the set parameters.
Set successfully return: DOWN.
Setup failed to return: FALL.

HW-666
1. On-board micro-precision current transformer 2. Onboard sampling resistor 3. Modules 5A can be measured within an alternating current, the analog output corresponding to 5A/5mA 4. Rated input current: 5A 5. Rated output current: 5mA 6. Change: 1000: 1 7. The linear range: 0 ~ 10A (100 ohm) 8. Linearity: 0.2% 9. Precision rating: 0.2 10. Uses isolation voltage: 3000V Measurement 11. Sealing material: epoxy resin 12. Operating temperature: - 40 Celsius - 70 Celsius

HW-670
Product model: ZMCT103
Rated Input Current: 5A
Rated output current: 5mA
Ratio: 1000:1
Phase (when the rated input) : <= 15(100 ohm)
The linear range: 0-15A(100 ohm)
Linearity :0.2%
Isolation voltage: 4500V
Uses: For Current and power measurement
Sealing material: epoxy resin
Installation method: printed board installation
Working temperature: -40 to 85 degrees
Shell material: ABS

HW-666
1. On-board micro-precision current transformer 2. Onboard sampling resistor 3. Modules 5A can be measured within an alternating current, the analog output corresponding to 5A/5mA 4. Rated input current: 5A 5. Rated output current: 5mA 6. Change: 1000: 1 7. The linear range: 0 ~ 10A (100 ohm) 8. Linearity: 0.2% 9. Precision rating: 0.2 10. Uses isolation voltage: 3000V Measurement 11. Sealing material: epoxy resin 12. Operating temperature: - 40 Celsius - 70 Celsius

HW-670
Product model: ZMCT103
Rated Input Current: 5A
Rated output current: 5mA
Ratio: 1000:1
Phase (when the rated input) : <= 15(100 ohm)
The linear range: 0-15A(100 ohm)
Linearity :0.2%
Isolation voltage: 4500V
Uses: For Current and power measurement
Sealing material: epoxy resin
Installation method: printed board installation
Working temperature: -40 to 85 degrees
Shell material: ABS