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The power range described by the lithium battery protection board is suitable for the following products:
Massager battery pack, LED light backup power supply, 12V electronics, solar street light battery pack, monitoring backup power supply, and other products.
Note: The lithium battery protection board cannot be used for lithium iron phosphate batteries, xenon lamps, electric drill battery packs, electric fish machine battery packs, electric bicycle battery packs, children's car batteries, power motors above 550, 1W fisheye LED Lights, please pay attention to customers who purchase the above combination! .
The main function:
Overcharge protection, overdischarge protection, short circuit protection, overcurrent protection
Note: For products with a current above 3A, the battery discharge rate should be above 3C.
Rate calculation formula: 1C rate battery, 2000 capacity is equal to 2AH*1=2A upper limit working current.
3C rate battery, 2000 capacity is equal to 2AH*3=6A upper limit working current.
Upper working current

3A
Upper limit instantaneous current

8A
Overcharge voltage range

4.25V±0.05V
Overcharge voltage range

2.5V±0.05V
Quiescent current

<30uA
Charging voltage

12.6~13V
Short circuit protection

Can be protected, delayed self-recovery
Size

51*10*3.0mm
In use, the battery will heat up, but the battery rate is not applicable. In this case, it cannot be used for a long time, and the battery will be damaged quickly.

Note: This protective board cannot be used for lithium iron phosphate batteries, hernia lights, hand drill battery packs, electric fish machine battery packs, electric bicycle battery packs, children's car batteries, motors above 775 (4A), and 1W fisheye LED lights. Please pay attention to customers who purchase in the above combination!
The power range described is applicable to the following products:
Low-power inverter, massager battery pack, LED lamp backup power supply, electronic products, solar street lamp battery pack, monitoring backup power supply, and other products.
Note: For products with a current above 3A, the battery discharge rate must be above 3C.
The magnification calculation formula: For a battery with a 1C magnification, the 2000 capacity is equal to 2AH*1=2A upper limit working current.
3C rate battery, 2000 capacity is equal to 2AH*3=6A upper limit working current.
In use, the battery will heat up, which means that the battery rate is not applicable. In this case, the battery cannot be used for a long time, and the battery will be damaged quickly.
Note 1: Wiring 0V (B-), 3.7V (B1), 7.4V (B2), 11.1V (B3), 14.8V (B ) strictly according to the diagram, don't intentionally short circuit!
Note 2: After the line is connected, it needs to be charged before output.
Note 3: When connecting 4 sets of batteries in series, please ensure that the voltage of each set of batteries is the same. If they are not the same, please charge each set of batteries separately and then use them in series. During the discharge test, the battery with the fast voltage drop is a bad battery.
Explain:
Do not mix good batteries and bad batteries together! The closer the capacity/internal resistance of the 4 sets of batteries are, the better! (2 good batteries 2 bad batteries = 4 bad batteries).
Properties of lithium battery protection board
Model

HX-4S-D20

Charging voltage

16.8V~17V
Maximum operating current

10A

Overcharge voltage range

4.25~4.35V(±0.05V)
Upper limit instantaneous current

20A

Over-discharge voltage range

2.3~3.0V(±0.05V)
Quiescent Current

<30uA

Operating temperature

-40~ 50℃
Internal resistance

<100mΩ

Storage conditions

-40~ 80℃
Short circuit protection

Can be protected, needs to be recharged

Effective life

>50000 Hour
Protection board size and device description:
The size of the protection board is 35*35*3.6mm; the components are S-8254AA protection chip and D403*4

Note: The lithium battery protection board cannot be used for lithium iron phosphate batteries, hernia lights, hand drill battery packs, electric fish machine battery packs, electric bicycle battery packs, children's car batteries, power motors above 550, and 1W fisheye LEDs. Lamps, please pay attention to customers who purchase the above combination! .
The power range described is applicable to the following products:
Massager battery pack, LED lamp backup power supply, 12V electronic products, solar street lamp battery pack, monitoring backup power supply, and other products.
The main function:
Overcharge protection, over discharge protection, short circuit protection, over current protection
Wiring instructions:
B connect to battery positive
B- Connect to the negative pole of the battery
MB connects to the connection point between battery 1 and battery 2
P is connected to the positive electrode of the charge/discharge terminal (common to the charge terminal/discharge terminal)
P- connect to the negative electrode of the charge/discharge terminal (common to the charge terminal/discharge terminal)
Reminder: When assembling the battery pack, the battery voltage, capacity, and internal resistance must be paired. The battery voltage is about 3.7V rated voltage. After the battery pack is assembled, there is no output, just use 8.4V to charge

Note: The lithium battery protection board cannot be used for lithium iron phosphate batteries, hernia lights, hand drill battery packs, electric fish machine battery packs, electric bicycle battery packs, children's car batteries, power motors above 550, and 1W fisheye LEDs. Lamps, please pay attention to customers who purchase the above combination! .
The power range described is applicable to the following products:
Massager battery pack, LED lamp backup power supply, 12V electronic products, solar street lamp battery pack, monitoring backup power supply, and other products.
The main function:
Overcharge protection, over discharge protection, short circuit protection, over current protection
Wiring instructions:
B connect to battery positive
B- Connect to the negative pole of the battery
MB connects to the connection point between battery 1 and battery 2
P is connected to the positive electrode of the charge/discharge terminal (common to the charge terminal/discharge terminal)
P- connect to the negative electrode of the charge/discharge terminal (common to the charge terminal/discharge terminal)
Reminder: When assembling the battery pack, the battery voltage, capacity, and internal resistance must be paired. The battery voltage is about 3.7V rated voltage. After the battery pack is assembled, there is no output, just use 8.4V to charge

Single bus digital temperature and humidity sensor DHT11 module Arduino electronic building blocks
1. Size: Length 32mmX Width 14 mm
2. Sensor model: DHT11 temperature and humidity sensor
3. Working voltage: DC 5V
Features:
1. Humidity measurement range: 20---90% RH
2. Humidity measurement accuracy: ±5% RH
3. Temperature measurement range: 0---50℃
4. Temperature measurement accuracy: ±2℃
5. Working voltage: DC5V/3.3V
6. Digital signal output
7. Data port with pull-up resistor
8. With fixing screw holes for easy installation
Wiring method:
VCC → 3.3V/5V power supply positive
GND → negative pole of power supply
DATA → MCU IO port
Warm reminder: Do not connect VCC and GND reversely, it will burn if you connect it!

Features:
1) high-accuracy voltage detection circuit;
2) terminal of the charger using high voltage device;
3) Built-in three-stage over-current detection circuit (over-current 1, over-current 2, or load short circuit);
4) MOS transistor can control the battery charge and discharge;
5) low standby current consumption.
Parameter:
Over-charge voltage

4.25~4.35V(±0.05V)
Over-discharge voltage

2.5~3.0V(±0.05V)
Max continuous current

8A
Max peak current

15A
Working temperature

-40℃~ 50℃
Storage Temperature

-40℃~ 80℃
Small current

<3uA
Life cycle

>50000hours
Resistance

<300mΩ
Short cut protection

Protectable,charge can repair
Size

41*16*3.5mm
Note: The lithium battery protection board cannot be used for lithium iron phosphate batteries, hernia lights, hand drill battery packs, electric fish machine battery packs, electric bicycle battery packs, children's car batteries, power motors above 550, and 1W fisheye LEDs. Lamps, please pay attention to customers who purchase the above combination! .
The power range described is applicable to the following products: massager battery pack, LED lamp backup power supply, 12V electronic products, solar street lamp battery pack, monitoring backup power supply, and other products.
Main functions: overcharge protection, over-discharge protection, short circuit protection, overcurrent protection
Wiring instructions:
B is connected to the positive electrode of the battery
B- connect to the negative pole of the battery
MB connects to the connection point between battery 1 and battery 2
P is connected to the positive electrode of the charging/discharging terminal (common to the charging terminal/discharging terminal)
P-Connect the negative electrode of the charge/discharge terminal (common to the charge terminal/discharge terminal)
Reminder: When assembling the battery pack, the battery voltage, capacity, and internal resistance must be paired. The battery voltage is about 3.7V at the rated voltage. After the battery pack is assembled, there is no output. Just charge it with 8.4V.

Product parameter
Name:1.1V Li-ion BMS 8A
Product size: 30*30*3mm
Upper limit operating current: 8A Upper limit instantaneous current: 12A
Overcharge voltage range: 4.25±0.05v Overdischarge voltage range 2. 5v ±0. 05v
Charging voltage: 12. 6V-13V Quiescent current: small \T30uA
Short circuit protection: can protect, delay self-recovery
Note: For products with a current above 3A, the battery discharge rate must be above 3C.
The magnification calculation formula: for a battery with a 1C magnification, the capacity of 2000 is equal to 2AH*1=2A working current.
3C rate battery, 2000 capacity is equal to 2AH*3=6A working current.
The battery will heat up during use, which means that the battery rate is not applicable. In this case, the battery cannot be used for a long time and the battery will be damaged quickly.
Note 1: Wiring OV (B-), 3.7V (Bl), 7.4V (B2), 11.1V (B ) strictly according to the diagram, do not short-circuit intentionally!
Note 2: After the line is connected, it needs to be charged before output.
Note 3: When connecting three sets of batteries in series, please ensure that the voltage of each set of batteries is the same. If they are not the same, please charge each set of batteries separately and use them in series.
During the discharge test, the battery with the fast voltage drop is a bad battery.
Explain: Don't mix good batteries and bad batteries together! The closer the capacity/internal resistance of the 3 sets of batteries, the better!
(2 good batteries 1 poor battery use effect = 3 poor batteries use effect)

Digital light intensity detection
Model: GY-302
Size: 13.9mm X 18.5mm
Using ROHM original BH1750FVI chip
Power supply: 3-5v
Data range: 0-65535
The sensor has a built-in 16bit AD converter
Direct digital output, omit complex calculations, omit calibration
No distinction between ambient light sources
Spectral characteristics close to visual sensitivity
Can perform 1 lux high-precision measurement of a wide range of brightness

Disclaimer:
1 single module can drive an 8 * 8 dot matrix common cathode
2 the module Operating voltage: 5 v
The Module 3 dimensions: length 3.2 cm X 3.2 cm wide X 1.3 cm high
4 holes with four screws, the diameter of 3 mm
Five modules with input and output interfaces, support for cascading multiple modules
Wiring instructions:
1 on the left block to an input port, then an output port on the right.
2 the When the control of a single module, simple enter the port received a CPU
When wining 3 modules cascaded output-input termination CPU, the input-output termination module of the first two modules of the first one, the first two modules of the termination input terminal of the three modules, and so.
The To 51 single example:
VCC 5 v
GND GND
DIN P2.2
CS P2.1
CLK P2.0

This is a super mini Solar Lipo charger based on the CN3065 - a single lithium battery charge management chip.
This
Solar charger provide you with the ability to get the most possible
power out of your solar panel or other photovoltaic device and into a
rechargable LiPo battery. Set-up is easy as well, just plug your solar
panel into one side of the Solar charger and your battery into the other
and you are good to start charging!
The
output of the Solar Charger is intended to charge a single polymer
lithium ion cell. The load should be connected in parallel with the
battery. By default, the Solar charge comes set to a maximum charge
current of 500mA with a maximum recommended input of 6V (minimum 4.4V).
It’s recommended that batteries not be charged at greater than their
capacity rating.
Features:
Solar panel input: 4.4-6V
Max charge current: 500Ma
Interface: 2-pin JST connectors(or PH2.0)
Short circuit protection
Continuous Charge Current Up to 500mA
Battery status indication ( Red : Charging , Blue: Charged )
Micro-USB Connector
Size: 2cm x 4cm

Product detailed parameters
Product name: Touch dimming module (touch switch)
Specification model: OE-TP dimming (10A)
Power supply range: DC 5-20V recommended 12V power supply
Output current: sink current MAX: 10A recommended 3A work
Protection function: power supply reverse protection
Induction indication: output red light is on
Working mode: configurable. (Default: fade with memory, note fade, stepless dimming) Touch distance
Touch distance: less than 6mm (glass acrylic)
Quiescent current: less than 5mA
Working temperature: -40-----85 ℃
Appearance size: 20x15x2mm
Net weight: 1.5 grams
Remarks: touch the surface of other ceramics, plastics, wood and other media, and the thickness is less than 3mm

L293D drive module motor drive expansion board L293D motor drive motor board
* 2 5V servo motor (steering gear) ports connected to the Arduino's high-resolution and high-precision timer-no jitter!
* Up to 4 bidirectional DC motors and 4 PWM speed regulation (about 0.5% resolution)
* Up to 2 stepping motors forward and reverse control, single/double step control, staggered or micro step and rotation angle control.
* 4 H-bridges: Each bridge of the L293D chip provides .0.6A (peak 1.2A) current with thermal cut-off protection, 4.5V to 36V.
* The pull-down resistor ensures that the motor remains stopped when the power is turned on.
* Large terminal wiring terminals make wiring easier (10-22AWG) and power supply.
* With Arduino reset button.
* 2 large terminal external power connection terminals to ensure the separation of logic and motor drive power.
* Compatible with Mega, Diecimila, & Duemilanove.

Introduction to MQ-135 sensor:
The gas-sensitive material used in the MQ135 gas sensor is tin dioxide (SnO2) with low conductivity in clean air. When there is pollutant gas in the environment where the sensor is located, the conductivity of the sensor increases with the increase of the pollutant gas concentration in the air. Using a simple circuit, the change in conductivity can be converted into an output signal corresponding to the gas concentration.
The MQ135 sensor has a high sensitivity to ammonia, sulfide, and benzene vapors, and it is also ideal for smoke and other harmful monitoring. This sensor can detect a variety of harmful gases and is a low-cost sensor suitable for a variety of applications.
Module application:
Hazardous gas detection device used in homes and environments, suitable for the detection of harmful gases such as ammonia, aromatic compounds, sulfide, benzene vapor, smoke, etc. The test concentration range of gas-sensitive components: 10 to 1000ppm
Module features:
1. Adopt high-quality double-panel design, with power indication and TTL signal output indication;
2. With doing switch signal (TTL) output and AO analog signal output;
3. TTL output valid signal is low level. (The signal light is on when the output is low, and it can be directly connected to the single-chip microcomputer or relay module)
4. The voltage of analog output, the higher the concentration, the higher the voltage.
5. It has better sensitivity to air quality and harmful gas detection.
6. There are four screw holes for easy positioning;
7. Product dimensions: 32(L)*20(W)*22(H)
8. It has a long service life and reliable stability
9. Fast response and recovery characteristics
Electrical performance:
Input voltage: DC5V Power consumption (current): 150mA
DO output: TTL digital quantity 0 and 1 (0.1 and 5V)
AO output: 0.1-0.3V (relatively pollution-free), the highest concentration voltage is about 4V
Special reminder: After the sensor is powered on, it needs to be warmed up for about 20S to stabilize the measured data. It is normal for the sensor to heat up, because there is a heating wire inside, if it is hot, it will not be normal.
Wiring:
1. VCC: connect to the positive pole of the power supply (5V)
2. GND: connect to the negative pole of the power supply
3. DO: TTL switch signal output
4. AO: analog signal output

MQ-9 Gas sensor Sensitive material Used gas sensitive material. High / low-temperature circulation for heating Low temperature (1.5V heating) Carbon monoxide, carbon monoxide, carbon monoxide, carbon monoxide, high temperature (5.0V heating), high temperature ( 5.0V heating), flammable gas, low-temperature Gas body. Uses a simple electric circuit, which can be used immediately. MQ-9 Gas sensor Opposite oxidized gas, shell, liquefied gas-sensitive, this kind of gas sensor, carbon monoxide , carbon monoxide, flammable gas, suitable for various types, low-grade main sensor.

Introduction to MQ-5 sensor:
The gas-sensitive material used in the MQ-5 gas sensor is tin dioxide (SnO2) with low conductivity in clean air. When there is combustible gas in the environment where the sensor is located, the conductivity of the sensor increases with the increase of the combustible gas concentration in the air. Using a simple circuit, the change in conductivity can be converted into an output signal corresponding to the gas concentration. The MQ-5 gas sensor has a high sensitivity to butane, propane, and methane, and can take into account both methane and propane. This sensor can detect a variety of flammable gases, especially natural gas, and is a low-cost sensor suitable for a variety of applications.
It is suitable for monitoring devices of liquefied petroleum gas, natural gas, and coal gas in households or industries. Excellent resistance to ethanol and smoke interference.
Module features:
1. Adopt high-quality double-panel design, with power indication and TTL signal output indication;
2. With doing switch signal (TTL) output and AO analog signal output;
3. TTL output valid signal is low level. (The signal light is on when the output is low, and it can be directly connected to the single-chip microcomputer or relay module)
4. The voltage of analog output, the higher the concentration, the higher the voltage.
5. It has good sensitivity for gas and natural gas detection.
6. There are four screw holes for easy positioning;
7. Product dimensions: 32(L)*20(W)*22(H)
8. It has a long service life and reliable stability
9. Fast response and recovery characteristics
Electrical performance:
Input voltage: DC5V Power consumption (current): 150mA
DO output: TTL digital quantity 0 and 1 (0.1 and 5V)
AO output: 0.1-0.3V (relatively pollution-free), the highest concentration voltage is about 4V
Special reminder: After the sensor is powered on, it needs to be warmed up for about 20S to stabilize the measured data. It is normal for the sensor to heat up, because there is a heating wire inside, if it is hot, it will not be normal.

Introduction to MQ-2 sensor:
The gas-sensitive material used in the MQ-2 gas sensor is tin dioxide (SnO2) with low conductivity in clean air. When there is combustible gas in the environment where the sensor is located, the conductivity of the sensor increases with the increase of the combustible gas concentration in the air. Using a simple circuit, the change in conductivity can be converted into an output signal corresponding to the gas concentration. MQ-2 gas sensor has a high sensitivity to liquefied gas, propane, and hydrogen, and it is also ideal for the detection of natural gas and other combustible vapors. This sensor can detect a variety of flammable gases and is a low-cost sensor suitable for a variety of applications.
Module application:
It can be used for gas leakage monitoring devices in homes and factories, and is suitable for the detection of liquefied gas, butane, propane, methane, smoke, etc.;
Module features:
1. Adopt high-quality double-panel design, with power indication and TTL signal output indication;
2. With doing switch signal (TTL) output and AO analog signal output;
3. TTL output valid signal is low level. (The signal light is on when the output is low, and it can be directly connected to the single-chip microcomputer or relay module)
4. The higher the concentration of analog output voltage, the higher the voltage.
5. It has good sensitivity to liquefied gas, natural gas, city gas, and smog.
6. There are four screw holes for easy positioning;
7. Product dimensions: 32(L)*20(W)*22(H)
8. It has a long service life and reliable stability
9. Fast response and recovery characteristics
Electrical performance:
Input voltage: DC5V Power consumption (current): 150mA
DO output: TTL digital quantity 0 and 1 (0.1 and 5V)
AO output: 0.1-0.3V (relatively pollution-free), the highest concentration voltage is about 4V
Special reminder: After the sensor is powered on, it needs to be warmed up for about 20S to stabilize the measured data. It is normal for the sensor to heat up, because there is a heating wire inside, if it is hot, it will not be normal.
Wiring:
1. VCC: Connect to the positive pole of the power supply (5V)
2. GND: connect to the negative pole of the power supply
3. DO: TTL switch signal output
4. AO: analog signal output

1. In the electronic experiment, it is convenient to lead the USB power or data to the PCB pin socket!
2. At present, mobile phone chargers are available everywhere, and almost everyone has them. This module can easily convert the charger's power and data lines into regular DIP2.54mm pins, which is convenient for your application.

Introduction to MQ-4 sensor:
The gas-sensitive material used in the MQ-4 gas sensor is tin dioxide (SnO2) with low conductivity in clean air. When there is combustible gas in the environment where the sensor is located, the conductivity of the sensor increases with the increase of the combustible gas concentration in the air. Using a simple circuit, the change in conductivity can be converted into an output signal corresponding to the gas concentration. The MQ-4 gas sensor has a high sensitivity to methane, as well as good sensitivity to propane and butane. This sensor can detect a variety of flammable gases, especially natural gas, and is a low-cost sensor suitable for a variety of applications.
Module application:
Suitable for methane gas, natural gas, and other monitoring devices in households or factories, and can test 300 to 10000ppm of natural gas and methane;
Module features:
1. Adopt high-quality double-panel design, with power indication and TTL signal output indication;
2. With doing switch signal (TTL) output and AO analog signal output;
3. TTL output valid signal is low level. (The signal light is on when the output is low, and it can be directly connected to the single-chip microcomputer or relay module)
4. The voltage of analog output, the higher the concentration, the higher the voltage.
5. It has good sensitivity to methane and natural gas detection.
6. There are four screw holes for easy positioning;
7. Product dimensions: 32(L)*20(W)*22(H)
8. It has a long service life and reliable stability
9. Fast response and recovery characteristics
Electrical performance:
Input voltage: DC5V Power consumption (current): 150mA
DO output: TTL digital quantity 0 and 1 (0.1 and 5V)
AO output: 0.1-0.3V (relatively pollution-free), the highest concentration voltage is about 4V
Special reminder: After the sensor is powered on, it needs to be warmed up for about 20S to stabilize the measured data. It is normal for the sensor to heat up, because there is a heating wire inside, if it is hot, it will not be normal.
Wiring:
1. VCC: Connect to the positive pole of the power supply (5V)
2. GND: connect to the negative pole of the power supply
3. DO: TTL switch signal output
4. AO: analog signal output

Diameter: 1.26″ (34 mm)
Tire Width: 0.26″ (6.5 mm)
Weight: 0.11 oz (3.2 g)
D Shaft Diameter: 3mm "D"

Diameter: 1.26″ (34 mm)
Tire Width: 0.26″ (6.5 mm)
Weight: 0.11 oz (3.2 g)
D Shaft Diameter: 3mm "D"

1. Product overview:
"RRD-102V2.0" Stereo Radio Module (FM Stereo Radio Module) High sensitivity, low power consumption, ultra-small size FM Stereo radio module. Using RDA5807M (or RDA5802NM) of RDA Microelectronics, this circuit has few peripheral components and extremely small noise figure. It has the advantages of small size, low power consumption, low cost, simple application and wide range of use. It is an easy-to-use and cost-effective single-chip FM stereo radio module.
A: Mobile DVD, TV, MP3, MP4 and other built-in FM full-band wireless receiving modules.
B: Stereo FM broadcasting system in public places such as industrial and mining, enterprises, campuses, communities, tourist areas, etc.
C: wireless audio and wireless stereo headset function.
D: GPS navigation, TV broadcasting system and other wireless FM radio.
E: game consoles and wireless audio electronic toys.
F: Stereo radios such as mobile phones, cell phones, intercom systems, mobile radio devices, etc.
G: Peripheral applications such as PDAS and Notebook PC.
2. Features:
A. Using the general 102BC module package, the user can directly replace it without changing the circuit design.
B. High sensitivity, low noise, strong anti-interference ability, few external components, small size (11*11.2MM Max), and extremely simple to use.
C. 76-108MHz global FM frequency band compatibility (including Japan 76-91MHz and Europe and the United States 87.5-108.5MHz).
D, I2C serial data bus interface communication, support external reference clock input mode.
E. Fully integrated CMOS process single-chip integrated circuit with extremely low power consumption.
F. Built-in high-precision A/D (analog-to-digital converter) and digital frequency synthesizer.
G. Built-in LDO adjustment, low power consumption, ultra-wide voltage range (2.7-3.6VDC).
H. Built-in noise cancellation, soft mute, bass enhancement circuit design.
I. High-power 32Ω load audio output, direct earphone connection, no need for external audio driver amplification.
J. Simple application, low cost and high cost performance.

Module Features:
LoRa™ spread spectrum modulation technology
• Ultra long communication distance of 15KM
• 20dBm-100mW constant RF power output with voltage change
• High sensitivity: as low as -148dBm
• Half-duplex SPI communication
• Programmable bit rate up to 300kbps
• Support FSK, GFSK, MSK, GMSK, LoRa™ and OOK modulation
• 127dB RSSI dynamic range
• Automatic RF signal detection, CAD mode and ultra-fast AFC
• Packet engine up to 256 bytes with CRC
• Small volume dual row stamp hole patch package
• With shielding case
• Spring antenna (Ra-01) or IPEX external antenna (Ra-02)

This is a small buzzer for the LilyPad system. Use 2 I/O pins on the LilyPad main board and create different noises based on the different frequency of I/O toggling. Loud enough to hear inside a pocket but not obtrusively loud.
Please note: This is an inductive buzzer meaning that is will act as a short to ground if you are not actively driving it. We recommend you put both I/O pins to low (0V) when the buzzer is not used. Also, it's come to our attention that washing these buzzers will damage them. Until we've figured out a solution to this, avoid washing any portion of your project that contains one of these buzzers.
LilyPad is a wearable e-textile technology developed by Leah Buechley and cooperatively designed by Leah and SparkFun. Each LilyPad was creatively designed to have large connecting pads to allow them to be sewn into clothing. Various input, output, power, and sensor boards are available. They're even washable!
Note: A portion of this sale is given back to Dr. Leah Buechley for continued development and education of e-textiles.
Dimensions:
20mm outer diameter
Thin 0.8mm PCB
Documents:
Schematic
Eagle Files
Datasheet(Buzzer)
LilyPad Buzzer Sticker Sheet
All LilyPad Product Sticker Sheet
Package Included:
5 x New LilyPad Buzzer module

Description: 
You’ve always wanted to output analog voltages from a microcontroller, the MCP4725 is the DAC that will let you do it! The MCP4725 is an I2C controlled Digital-to-Analog converter (DAC). A DAC allows you to send analog signal, such as a sine wave, from a digital source, such as the I2C interface on the Arduino microcontroller. Digital to analog converters are great for sound generation, musical instruments, and many other creative projects!
This version of the MCP4725 Breakout fixes a few issues with the board including the IC footprint, the I2C pinout, changes the overall board dimensions to better fit your projects, and a few more minor tweaks. This board breaks out each pin you will need to access and use the MCP4725 including GND and Signal OUT pins for connecting to an oscilloscope or any other device you need to hook up to the board. Also on board are SCL, SDA, VCC, and another GND for your basic I2C pinout. Additionally, if you are looking to have more than one MCP4725 on a bus, the pull-up resistors on this board can be disabled just check the Hookup Guide in the Documents section below for instructions and tips on doing this.
Features:
12-bit resolution
I2C Interface (Standard, Fast, and High-Speed supported)
Small package
2.7V to 5.5V supply
Internal EEPROM to store settings

The power supply is an isolated industrial power supply module with temperature protection, full overcurrent and short circuit protection, high and low voltage isolation, AC85~265V wide voltage input, AC and DC, 431 DC5V output voltage accuracy, ultra-small size, high reliability, and cost-effective characteristics.
Input voltage: AC 85~265v 50 / 60HZ or DC100v-370v
Output voltage: DC5V (±0.2V)
Output current: 700mA
Power: 3.5W

1, Product introduction
The expansion board can be used as a
carving machine,3DPrinter driver expansion board, a total ofFourThe slot
of the drive module of the stepper motor.Note that Moto Sako does not
containA4988Stepper motor drive module, need to be in the shop to buyCan
be drivenFourThe road does not enter the motor, and each step motor is
only requiredTwoindividualIOMouth, that is to say,SixindividualIOMouth
can be a very good managementThreeStepper motor, the use of very
convenient, farewell to the traditional stepper motor cumbersome.
2, UNOAnd moduleIOIntroduction to the correspondence of the mouth
Stepper motor basic control needs of
the pin, the other pin is in the engraving machine, or3DThe printer when
it is used, here we do not make detailed,IOCorresponding as above.
  UNO----------------------Expansion board
    8 ------------------------ (ENStepper motor driver to enable the end, the low level effective)
7 and Z.DIR (ZAxis direction control)
6 and Y.DIR (YAxis direction control)
5 and X.DIR (XAxis direction control)
4 conducting Z.STEP (ZAxis step control)
3 conducting Y.STEP (YAxis step control)
2 conducting X.STEP (XAxis step control)
/ /The following is a simple stepper motor control procedures,
#define EN 8 / /Stepping motor to the end, the low level effective
#define X_DIR 5 //Xaxis Stepper motor direction control
#define Y_DIR 6 //yaxis Stepper motor direction control
#define Z_DIR 7 //zaxis Stepper motor direction control
#define X_STP 2 //xaxis Step control
#define Y_STP 3 //yaxis Step control
#define Z_STP 4 //zaxis Step control
*
/ /Function:StepFunction: control the direction of the stepper motor, step by step.
/ /Parameters:DirDirection
controlDirPin,Corresponding to the stepper
motorDIRPin,StepperPinCorresponding to the stepper
motorStepPin,StepsNumber of steps
/ /No return value
* /
Void step (Boolean dir byte dirPin,, byte stepperPin int steps,)
{
(digitalWrite dirPin, dir);
Delay (50);
For (int i = 0; I < steps; i ) {
DigitalWrite (stepperPin, HIGH);
DelayMicroseconds (800);
DigitalWrite (stepperPin, LOW);
DelayMicroseconds (800);
}
}
Void (setup) {//Will be used in the stepper motorIOPin is set to output
(pinMode X_DIR, OUTPUT); pinMode (X_STP, OUTPUT);
(pinMode Y_DIR, OUTPUT); pinMode (Y_STP, OUTPUT);
(pinMode Z_DIR, OUTPUT); pinMode (Z_STP, OUTPUT);
(pinMode EN, OUTPUT);
(digitalWrite EN, LOW);
}
Void (loop) {
(step false, X_DIR, X_STP, 200); //XShaft motor reversalOneRing,Two hundredStep for a circle
(step false, Y_DIR, Y_STP, 200); //yShaft motor reversalOneRing,Two hundredStep for a circle
(step false, Z_DIR, Z_STP, 200); //zShaft motor reversalOneRing,Two hundredStep for a circle
Delay (1000);
(step true, X_DIR, X_STP, 200); //XShaft motor ForwardOneRing,Two hundredStep for a circle
(step true, Y_DIR, Y_STP, 200); //yShaft motor ForwardOneRing,Two hundredStep for a circle
(step true, Z_DIR, Z_STP, 200); //zShaft motor ForwardOneRing,Two hundredStep for a circle
Delay (1000);
}
Experimental phenomena: a turn of the stepper motor, pauseOneSecond, then a story circle, so the cycle.
It is worth noting that in theA4988When the module is not plugged in, step motor connection mode is:
2A, 2BFor a group (red, green),1A,
1BFor a group (blue, yellow) would like to change direction, change the
location of one group can be, for example2A,and2BExchange.
Description Product
CNC Shield Board:
Latest CNC Shield Version 3
0.9 compatible. GRBL (open source firmware that runs on an uno that turns the G-code commands into stepper 37signals)
PWM Spindle and direction pins
4-Axis support (X, Y, Z, A-Can duplicate X, Y Z, or do a full 4th axis with custom firmware using pins D12 and D13)
2 x End stops for each axis (6 in total)
Coolant enable
Uses removable A4988 or DRV8825 compatible stepper drivers
Jumpers to set the Micro-Stepping for the stepper. (some drivers like the DRV8825 can do up to 1 / 32 micro-stepping)
Compact design.
Stepper Motors can be connected with pin Molex connectors or soldered 4 in place.
Runs
on 12-36v DC. (at the moment only the DRV8825 drivers can handle up to
36V so please consider the operation voltage when powering the.)
Package includes:
Shield Board 1xCNC

Sampling hx711 24-bit ad chip, dual-channel differential input. Full-chip machine welding, with metal shielding, distribution of straight and bent pins, which can meet various installation and welding methods. The board uses two 47uF capacitors, and the materials are sufficient! Built-in pull-up resistor, and reserved CPU welding position, it is very suitable for their own secondary development of various sensor-related applications.
Main features of the module:
● With metal shield, strong anti-interference, reserved cpu (STC15F104) position, you can upgrade and develop by yourself.
● Two-way selectable differential input
● On-chip low-noise programmable amplifier with selectable gains of 32, 64 and 128
● On-chip voltage regulator circuit can directly provide power to external sensors and on-chip A/D converters
● The on-chip clock oscillator does not require any external devices, and an external crystal or clock can also be used if necessary
● Power on automatic reset circuit
● Simple digital control and serial communication: all controls are input by pins, and the internal registers of the chip do not need to be programmed
● The output data rate of 10Hz or 80Hz can be selected
● Synchronously suppress 50Hz and 60Hz power interference
● Power consumption (including regulated power supply circuit):
Typical working current: <1.7mA, power-off current: <1μA
● Operating voltage range: 2.6 ~ 5.5V
● Operating temperature range: -20 ~ 85℃
●Size: 29mm * 17mm * 4mm
Module detection method:
1. Preliminary quick judgment: disconnect all the connections of the module, and only supply power to the module 5v (that is, vcc is connected to 5v, gnd is grounded), and then the ck port of the module is shorted to ground, and then the out voltage to ground should be measured. About 4.5v, then measure the voltage of the DO/RX port to ground, it should be about 0v, if the voltage is consistent, it means that the module is 99% normal.
2. Complete test judgment: Use the test circuit diagram provided by our shop to build a circuit, burn the 89c51 microcontroller into the hex test program provided by our shop, and then connect the computer with a serial cable, run the serial assistant on the computer, and then you can receive the test circuit sent out The reading report is normal, indicating that the module is normal.
The J1 jumper on the back of the module is the data output rate of the HX711 chip is 80hz/10hz selection. J1 is open, the output rate is 80hz, that is, ad conversion is 80 times per second, J1 is short-circuited, and the output rate is 10hz.

Step-down USB charging module that supports multiple fast charging protocols such as Qualcomm QC3.0
Product Features
Input voltage range: 6V-32V
Output voltage: default 5V, automatically adjust between 3-12V after triggering fast charge
Output power: maximum 24W (5V@3.4A, 9V@2.5A, 12V@2A, etc.)
Output voltage cable compensation function
Conversion efficiency: 90% -97%
Support multiple fast charging protocols
Input overvoltage and undervoltage protection
Input overcurrent protection
Output over current, short circuit protection
Whole machine over-temperature protection
Support fast charge protocol
BC1.2, Apple, Samsung agreement
Qualcomm QC2.0 and 3.0
MTK PE1.1/PE2.0
Huawei Quick Charge Agreement AFC
Spreadtrum Quick Charge Agreement SFCP
Applications
Solar panel to mobile phone charging
Car charging transformation
Driving recorder power supply
Home power transformation
Product Size
37*20*10mm, weight 7.5g

Note: Lithium iron phosphate battery cannot be used for lithium battery protection board, hernia lamp, hand drill battery pack, electric fish machine battery pack, electric bicycle battery pack, children's car battery, power motor above 550, 1W fisheye LED Lamps, please pay attention to customers who purchase the above combination! .
Main functions: overcharge protection, overdischarge protection, short circuit protection, overcurrent protection
Wiring instructions:
B connect to battery positive
B- Connect to the negative pole of the battery
P Battery pack output and input positive
P- Battery pack output and input negative
Precautions:
1. Please pay attention to the use conditions of input and output voltage and load current so that the power consumption in the protection board does not exceed the allowable power consumption of the electrical parameters.
2. The load current should not work for a long time between the upper limit continuous working current and the overcurrent protection current.
3. When the battery is connected, it may not be able to discharge. In this case, the charger can be connected to the normal working state.
4. Although the protection board has built-in anti-static protection circuit, please do not touch the board with your hands when the electric protection board is working, so as to avoid static electricity to damage the protection board.