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1. Onboard TTP229 capacitive 16-key touch sensor IC
2. Onboard power indicator
3. Working voltage: 2.4V-5.5V
4. The module can set output mode, key output mode, long output time and fast/low power consumption selection
5. PCB board size: 49.3(mm)x64.5(mm)
Shipping list:
TTP229 16-way touch switch module x 1

Module description:
1. The module uses genuine high-quality relays, the maximum load of the normally open interface: AC 250V/10A, DC 30V/10A;
2. Adopt SMD optocoupler isolation, strong driving ability, stable performance; trigger current 5mA;
3. The working voltage of the module has 5V, 9, 12V, 24V to choose from;
4. The module can be triggered by a jumper to set high or low level;
5. Fault-tolerant design, even if the control line is broken, the relay will not act;
6. Power indicator (green), relay status indicator (red)
7. The interface design is user-friendly, all interfaces can be directly connected through the terminal block, which is very convenient
8. Module size: 50mm * 46mm* 18.5mm (length * width * height)
9. There are 4 fixing bolt holes, the hole is 3.1mm, and the spacing is 44.5mm*35.5mm
Module interface:
1. DC : connect to the positive pole of the power supply (the voltage is according to the requirements of the relay, there are 5V.9V.12V and 24V options)
2. DC-: Connect to the negative pole of the power supply
3. IN1: 1 signal trigger terminal, you can set high or low level to control the relay to close
3. IN2: 2-channel signal trigger terminal, you can set high or low level to control the relay to close
Relay output:
1. NO1: 1 relay normally open interface, the relay is suspended before being closed, and short-circuited with COM1 after being closed
2. COM1: 1 relay common interface
3. NC1: 1 relay normally closed interface, short-circuit with COM1 before the relay is closed, and hang in the air after being closed
4. NO2: 2-way relay normally open interface, the relay is suspended before the pull-in, and short-circuited with COM2 after the pull-in
5. COM2: Common interface of 2 relays
6. NC2: 2-way relay normally closed interface, short-circuit with COM2 before the relay is closed, and hang in the air after being closed
Technical parameter:
Relay version

Quiescent current

Maximum current

Trigger current

Trigger voltage(low)

Trigger voltage(high)
5V

5mA

190mA

2-4mA

0-1.5V

2.5-5V
12V

5mA

80mA

2-4mA

0-4V

4.5-12V
24V

5mA

50mA

2-4mA

0-8V

8.5-24V
High and low level trigger selection terminal:
1.S1 is the high and low level trigger selection of 1 relay;
2.S2 is the high and low level trigger selection of 2 relays;
3. When com and low are shorted, the corresponding relay is triggered at low level, and when com is shorted with high, it is triggered at high level

●High precision
●Low-start working voltage, red minimum 4V, green minimum 4V, blue minimum 4.0V, yellow minimum 4V. When the power supply voltage is lower than 3.7V, only the brightness is reduced, but the measurement accuracy is not affected.
●With reverse connection protection, no burning if connected reversely.
Measuring range

Red DC3.7-30.0V,
Green DC3.70-32.0V,Blue DC3.7-30.0V
Power supply range

No need for additional power supply, directly use the tested voltage as the power supply, the range is the same as above
Highest input

DC 32.0V. Note: Input voltage higher than 32V may be permanently damaged！
Allowable error

±0.1% ;
Automatic decimal point shift
When the measurement voltage>= 10.0V, the measurement error is  /- 0.1V
When the measurement voltage is <= 9.99V, the measurement error is  /- 0.02V
Input resistance

> 100KΩ
Working current

Red< 23mA，Green< 18mA，Blue< 13mA
Refresh rate

About 300mS once
Display method

Three-digit 0.36" LED digital tube
Display color

Red,Green,Blue optional
Lead length

15cm
Size

23 * 15 * 10 mm, length * width * thickness (without mounting ears);
Length with mounting ears: 33mm
Mounting holes

Pitch: 28mm, Aperture: 2.8mm
Net weight

4.7g
Gross heavy

5.3g
Operating temperature

-10℃~65℃

MQ-6 Sensor Description:
Sensitive material MQ-6 gas sensor is used to clean the air in the lower conductivity of tin dioxide (SnO2). When there is an environment in which the combustible gas sensor, conductivity sensor with increasing concentration of combustible gases in air increases. Using a MQ-6 gas sensor for propane, butane, liquefied petroleum gas sensitivity is high, natural gas and has good sensitivity. This sensor can detect a variety of flammable. gas, is a low-cost sensor for a variety of applications
Suitable for home or industrial LPG (liquefied petroleum gas), butane, propane, LNG (liquefied natural gas) detection devices. Excellent resistance to ethanol vapor, smoke interference
Module Features: Module Features:
1, using high-quality dual-panel design, with power indicator and TTL signal output instructions;
2, the switching signal having a DO (TTL) output and analog output AO;
3, TTL output valid signal is low. (Low-level signal when the output light can be directly connected to the microcontroller or relay module)
4, 0 ~ 5V analog output voltage, the higher the concentration the higher the voltage.
5, propane, butane, LPG, LNG has a good detection sensitivity.
6, there are four screw holes for easy positioning;
7 Product dimensions: 32 (L) * 20 (W) * 22 (H)
8, has a long life and reliable stability
9, rapid response and recovery characteristics

Features:
3.6V equalization voltage, equalization current is 58mA
use:
Charge balance
technical parameter:
Balance voltage and balance current
Precautions:
This equalization board is suitable for lithium iron phosphate battery packs with no equalization charge. The charge equalization makes each group of batteries in the battery pack fully charged at the same time.
The balance sheet has no charge-discharge protection function and cannot replace the protection board. When the battery is charged, the first fully charged battery is discharged through a resistor to balance the shunt.
Product size: 26*20.5*2.4mm
Solder point description:
B－ Connect the negative pole of the battery pack
B1 Connect to the contacts in battery 1 and battery 2
B2 Connect to the contacts in battery 2 and battery 3
B3 Connect to the contacts in battery 3 and battery 4
B4 connect to the positive pole of the battery pack

To simulate the temperature and humidity sensor LM35D module Arduino electronic building blocks
Reference parameter:
the long dimension: 28mm X W 12mm X H 10mm
the main chip LM35 temperature sensor
working voltage: DC 4-30V
linear Coefficient of variation: 10mv/℃
low power consumption is less than 60uA
temperature measuring range: 0-100 ℃
temperature measurement accuracy: ± 0.5 ℃
wide Operating voltage range: DC4 ~ 30V

Introduction to MQ-7 sensor:
The gas-sensitive material used in the MQ-7 gas sensor is tin dioxide (SnO2) with low conductivity in clean air. The high and low-temperature cycle detection method is used to detect carbon monoxide at low temperature (1.5V heating), the conductivity of the sensor increases with the increase of the carbon monoxide gas concentration in the air, and the high temperature (5.0V heating) cleans the stray gas adsorbed at low temperature. A simple circuit can convert the change in conductivity into an output signal corresponding to the gas concentration. The MQ-7 gas sensor has a high sensitivity to carbon monoxide. This sensor can detect a variety of gases containing carbon monoxide. It is a low-cost sensor suitable for a variety of applications.

Product description:
1, The module complies with international safety standards, control area load area isolation groove;
2, Genuine relay Songle;
3, With the power and relay action instructions, pull bright disconnect does not shine;
4, When a signal in the signal input terminal, the common terminal and the normally start conduction;
5, Microcontroller development board can be used as a module that can be used as a home appliance control;
6, The control of the DC or AC signal, can control 220V AC load;
7, There is a normally open and a normally closed contact;
8, Blue KF301 terminals to the line of control is more convenient.
Description of the high and low trigger, friends do not understand Take a look at:
High level trigger is a trigger voltage between the signal input and ground can be understood as a way of the signal input terminal and VCC cathode short trigger;
Low trigger means is the voltage between the signal input terminal and the ground for the OV trigger mode can be understood as a way of the signal input terminal and GND negative short trigger
Package include:
1Pcs  1 Channel Relay Module Low level

Features:
LM75A is a high-speed I2C interface, temperature sensor, in the temperature range -55  ~ 125 Centigrade The temperature was directly converted to digital signals, and to achieve the accuracy of 0.125 Centigrade. MCU can be read directly via I2C bus data in its internal registers, and through I2C to four data registers operates to set different operating modes. LM75A has three selectable logic address pins, making it possible to connect eight devices without address conflict on the same bus.
Features:
1. I2C bus interface, the device address 7 slave address 1001xxx, can expand outside eight devices on the same bus;
2. Power range: 2.8V ~ 5.5V, temperature range: -55  ~ 125 Centigrade;
3. 11 ADC provides a temperature resolution of 0.125 Centigrade;
4. Temperature accuracy: ±2 Centigrade(-25  ~ 100 Centigrade)   ±3 Centigrade (-55 ~ 125 Centigrade)
5. Programmable temperature threshold and hysteresis set points;
6. In order to reduce power consumption, the current consumption in shutdown mode is only 1.0uA;
7. On power-up the device can be used as a stand-alone temperature controllers;

Microcontroller weighing AD module-TM7711 and HX710A chip are software and hardware compatible; TM7711 is more cost-effective
This module uses a 24-bit high-precision A/D converter chip TM7711, which is designed for high-precision electronic scales with a single analog channel input. The input circuit can be configured to provide bridge voltage (such as pressure, weighing) sensor mode, is an ideal high-precision, low-cost sampling front-end module

Product description:
1. The high-quality soil sensor produced by our company is used for soil moisture detection. The surface is nickel-plated, with a widened sensing area, which can improve conductivity, prevent contact with soil and prolong the service life;
The product can control the humidity of the soil in a wide range, and adjust the corresponding threshold through the potentiometer. When the humidity is lower than the set value, DO outputs a high level, and when the humidity is higher than the set value, DO outputs a low level;
3. The comparator uses the LM393 chip, which works stably
4. Working voltage 3.3V~5V
5. Equipped with fixing bolt holes for easy installation
6. PCB size: 32mm*14mm
7.Delivery list: a set of modules and soil sensors, 2 20cm-long DuPont wires
Use:
Adjusting the soil moisture control threshold through the potentiometer can automatically control vegetable gardens, automatic watering of gardens, soil moisture control of home flower pots, various electronic games, electronic building blocks, Arduino designs, etc.
Module instructions:
1. The sensor is suitable for soil moisture detection;
2. The blue potentiometer in the module is used to adjust the threshold of soil humidity. It is adjusted clockwise, and the controlled humidity will be larger, and counterclockwise will be smaller;
3. The digital output D0 can be directly connected with the single-chip microcomputer, and the high and low level can be detected by the single-chip microcomputer, thereby detecting the soil moisture;
4 Small board analog output AO can be connected with AD module, through AD conversion, more accurate value of soil moisture can be obtained;
Wiring instructions (3-wire system)
1 VCC external 3.3V~5V
2 GND External GND
3 DO small board digital output interface (0 and 1)

This USB-to-TTL downloader can be used as serial communication, single-chip downloader, STM32 downloader, routing download, etc. This downloader has a USB interface, which can facilitate the extension of the download line, and reserve a pin interface for short-distance downloading.
STC MCU download mode:
1) The wiring is as follows: (only need to connect 3 wires)
The TXD end of the USB downloader -> connect to the MCU P3.0 (RX)
The RXD end of the USB downloader -> connect to the microcontroller P3.1 (TX)
GND terminal of USB downloader－>connect MCU GND
2) The development board or the smallest system uses a separate power supply. After connecting the cable, you will find that even if the development board switch is turned off, the development board power indicator will light up (weak). This is a normal phenomenon. Download STC according to the serial port. Serial MCU method download (the power supply needs to be cold-started once).
STM32 MCU download mode:
1) The wiring is as follows: (only need to connect 3 wires)
The TXD end of the USB downloader -> connect to the single-chip PA10 (RX1)
The RXD end of the USB downloader -> connect to the single-chip PA9 (TX1)
GND terminal of USB downloader－>connect MCU GND
2) 　The development board or the smallest system uses a separate power supply. Or use a USB downloader to provide 5V power supply. When downloading, you need to connect boot0 to VCC. After the download is complete, connect it to GND and press the reset button to complete the operation.
Support WIN10 WIN8 win7 32-bit, 64-bit operating system, support win xp operating system

Product Specifications
Product model: special heat sink for raspberry pi
Both Raspberry Pi B new version and Raspberry Pi 2 generation B version are available
Product material: 6063T extruded high-quality profile
Product application: Raspberry pi 2 model B/Raspberry pi B /Raspberry pi B, Raspberry pi 3/2 generation/Rpi B special heat sink, auxiliary heat sink for electronic chips such as development boards.

Product Specifications
Product model: special heat sink for raspberry pi
Both Raspberry Pi B new version and Raspberry Pi 2 generation B version are available
Product material: 6063T extruded high-quality profile
Product application: Raspberry pi 2 model B/Raspberry pi B /Raspberry pi B, Raspberry pi 3/2 generation/Rpi B special heat sink, auxiliary heat sink for electronic chips such as development boards.

BMP180 is a pressure sensor with high precision, small size and ultra-low energy consumption. It can be used in mobile devices. Its performance and accuracy can reach 0.03hPa, and its power consumption is low, only 3μA.
BMP180 adopts a powerful 8-pin ceramic leadless chip carrier (LCC) ultra-thin package, which can be directly connected to various microprocessors through the I2C bus
Main features:
Pressure range: 300~1100hPa (9000m~-500m above sea level)
Power supply voltage: 1.8V~3.6V (VDDA), 1.62V~3.6V (VDDD)
LCC8 package: Lead-free ceramic carrier package (LCC)
Low power consumption: 5μA, in standard mode
High precision: in low power consumption mode, the resolution is 0.06hPa (0.5m)
In high linearity mode, the resolution is 0.03hPa (0.25m)
With temperature output
I2C interface
Temperature compensation
Lead-free, RoHS compliant
MSL 1 response time: 7.5ms
Standby current: 0.1μA
No need for external clock circuit
Typical application:
GPS navigation (dead reckoning, upper and lower bridge detection, etc.)
Indoor and outdoor navigation
Leisure, sports and medical health monitoring
Weather forecast
Vertical speed indication (rising/sinking speed)

BMP180 is a pressure sensor with high precision, small size and ultra-low energy consumption. It can be used in mobile devices. Its performance and accuracy can reach 0.03hPa, and its power consumption is low, only 3μA.
BMP180 adopts a powerful 8-pin ceramic leadless chip carrier (LCC) ultra-thin package, which can be directly connected to various microprocessors through the I2C bus
Main features:
Pressure range: 300~1100hPa (9000m~-500m above sea level)
Power supply voltage: 1.8V~3.6V (VDDA), 1.62V~3.6V (VDDD)
LCC8 package: Lead-free ceramic carrier package (LCC)
Low power consumption: 5μA, in standard mode
High precision: in low power consumption mode, the resolution is 0.06hPa (0.5m)
In high linearity mode, the resolution is 0.03hPa (0.25m)
With temperature output
I2C interface
Temperature compensation
Lead-free, RoHS compliant
MSL 1 response time: 7.5ms
Standby current: 0.1μA
No need for external clock circuit
Typical application:
GPS navigation (dead reckoning, upper and lower bridge detection, etc.)
Indoor and outdoor navigation
Leisure, sports and medical health monitoring
Weather forecast
Vertical speed indication (rising/sinking speed)

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.
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.
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 (B ) strictly according to the diagram, do not intentionally short-circuit!
Note 2: After the line is connected, it needs to be charged before output.
Note 3: When connecting 3 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 fastest voltage drop is the poor battery.
Explain: Do not 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 bad battery use effect = 3 bad batteries use effect).
Note: Due to the large current-limiting resistance used, the combined battery pack output should not be short-circuited, especially for large-capacity and high-current battery packs. Short-circuit may damage the board. Please pay attention, thank you.
The attributes of the lithium battery protection board:
Model: HX-3S-FL20
Overcharge voltage range: 4.25~4.35V (±0.05V)
Over-discharge voltage range: 2.5~3.0V (±0.05V)
Charging voltage: 12.6V~13V
Maximum operating current: 15A
Upper limit instantaneous current: 20A
Quiescent current: less than 30uA
Internal resistance: less than 100mΩ
Working temperature: -40~ 50℃
Short circuit protection: can be protected, delayed self-recovery.
Size: 58*20*3.6mm
Storage conditions: -40~ 80℃
Effective life: more than 30000 hours
Description of the protection board device;
The components are 2110-CB protection chip and AOD472*4.

Product parameters:
Onboard precision miniature current transformer ZMCT103C
On-board sampling resistor
The module can measure AC current within 5A, corresponding to analog output 5A/5MA
The output signal is an AC voltage signal
Size 18.3*17MM

Product name: TYPE-C female test board with wiring solder joints
Size: 40*25MM
Board thickness: 1.6MM

DIY power bank/power bank circuit board
Product Features:
1.4 LED lights display power, intelligent automatic shutdown in non-working state;
2. Built-in lithium battery protection IC, with over-current, over-voltage and under-voltage protection;
3. Dual USB output;
4. Motherboard size: thickness 8mm*width 32mm*length 69mm.
Basic product parameters:
Input port: MicroUSB (Android port)
Input requirements: 5V constant voltage power supply can be used as charging input power, matching charger is above 5V1A
Output port: USB
Output parameters: 5V1A/5V2A
Requirements for rechargeable batteries:
Usable batteries: 18650 battery, mobile phone battery, tablet battery, MP3 battery, etc. 3.7V-4.2V polymer lithium battery, which can be powered by a single cell (slice) or multiple cells (slices) in parallel (series connection is not supported, and series connection is not allowed ). (Note: Parallel connection increases capacity, series connection increases voltage, and can only be used in parallel!)
You can connect 2-6 18650 batteries in parallel! ! !
Unusable batteries: dry batteries, accumulators, 1.2V rechargeable batteries, nickel-metal hydride batteries, 3.2V iron-lithium polymer lithium batteries, etc.
Pay attention to the following points when installing the product:
1. The batteries must be connected in parallel, and the voltage must be between 3.2-4.2V to work. Both 18650 flat-head and polymer batteries can work;
2. The battery is positively connected to the motherboard B and negatively connected to B-, the motherboard will burn if installed;
3. New and old batteries, batteries with different models and brands cannot be mixed.

USB male to Dip 2.54mm straight plug 4p to straight plug adapter board is welded mobile phone power data cable
Module highlights:
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 conventional DIP2.54mm pins, which is very convenient for your application!
USB male connector to DIP2.54mm straight plug, the socket has been welded.

DS18B20 temperature measurement module
Module description:
1. Onboard DS18B20 chip, while leaving 3P round hole socket for easy insertion and removal of DS18B20 chip
2. The chip pins have all been led out and built-in pull-up resistors
3. Onboard power indicator
4. Board size: 21(mm)x10(mm)
Shipping list:
DS18B20 temperature measurement module temperature sensor module x 1

Raspberry pi GPIO extension cable 26P cable
Specifications:
1. Product name: Raspberry Pi 26P double-ended cable
2. Length: 20cm
3. Spacing: 2.54mm

Note: This 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, motors above 775 (4A), 1W fisheye LED lights Please pay attention to customers who purchase in the above combination! .
The attributes of the lithium battery protection board:
Model: HX-2S-D20
Overcharge voltage range: 4.25~4.35V (±0.05)
Over-discharge voltage range: 2.5~3.0V(±0.05)
Charging voltage: 8.4V-9V
Maximum operating current: 13A
Upper limit instantaneous current: 20A
Quiescent current: less than 10uA
Internal resistance: less than 300mΩ
Size: 46*20*3.6mm
Working temperature: -40~ 50℃
Storage conditions: -40~ 80℃
Effective life: more than 50000 hours
Short circuit protection: it can be protected and needs to be recharged
Welding point description:
· P is connected to the positive electrode of the battery;
· P-connect to the negative pole of the battery;
· MB connect to the connection point before battery 1 and battery 2;
· B is connected to the positive electrode of the charge/discharge terminal (shared by the charge terminal/discharge terminal);
· B- Connect to the negative pole of the charge/discharge terminal (shared with the charge terminal/discharge terminal).
Common problem  
1. Can my battery use your protection board?                                                                                                                                            
Answer: There are two issues to consider whether you can use this protection board: First, how many strings your battery is, you have to buy the protection board corresponding to the number of strings. Second, what material is your battery made of? We have two types of protection boards for lithium iron phosphate and polymer lithium batteries. If your battery is a single cell of lithium iron phosphate with a nominal 3.2V, you need to select lithium iron phosphate 3.2V in the category. If it is a polymer (ternary , Cobalt Acid, Lithium Manganese Oxide Battery) For single-cell batteries with a nominal 3.6V (or 3.7V), please select the polymer 3.7V classification.
2. How can I judge what material my battery is made of?
Answer: You can take a look at the nominal voltage of your battery. Lithium iron phosphate batteries are generally rated at 3.2V, and other batteries are generally rated at 3.6V or 3.7V. You can also directly ask the seller of the battery what material is the battery. Many buyers say that my battery is 18650 or 26650 soft pack, etc. This is the shape, not the material! We cannot determine your battery protection parameters based on this.
3. How many A protection boards should I choose?       
Answer: How many A protection boards to choose depends on the power of your product or the current limit of the controller. For example, 10A for those below 100W, 20A for those below 200W, 25A for those below 300W, and protection boards for those above 500W. The current cannot be less than the controller current limit.
4. Can my battery be used with this protection board if it is 20AH?
Answer: The size of your battery capacity is actually not directly related to the size of the current using this board. Large capacity is not a large battery. It mainly depends on the continuous current. That is to say, the greater your power, the continuous current of the protection board you choose. The bigger it is, it has no direct relationship with your battery capacity.
5. How should the charger voltage be set?         
Lithium batteries should be charged with special chargers for lithium batteries. Do not use lead-acid battery chargers. Lead-acid charging may cause high-voltage breakdown of the protection board MOS tube, causing the protection board to be overcharged and not protected.
Charger voltage setting: Use your battery string number*4.2V, this is the charging voltage of non-iron-lithium battery, the charging voltage of iron-lithium battery is the number of battery strings*3.60V, this is the charging voltage of iron-lithium battery, charging current standard It is 0.2 times the capacity.

DC-DC 3A step-down power supply module
Model

LM2596 3A adjustable
Input voltage

4.5V~28V
Output voltage

0.8V~20V
Output current

3A (peak value)
Conversion efficiency

96%  (peak value)
Output ripple

<30mV
Operating frequency

Maximum 1.5MHz, typical 1MHz
Operating temperature

-45℃~  85℃
Size

22mm * 17mm * 4mm
Application areas:
DIY mobile power supply, monitoring power supply, children's vehicle power supply, camera power supply, vehicle power supply, communication equipment power supply, various occasions that have strict requirements on volume and weight (such as aviation models, etc.).

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! .
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
P Battery pack output and input positive
P- Battery pack output and input negative