MH-Z19B carbon dioxide detection alarm-51 version

Introduction: The carbon dioxide alarm value can be set. When the alarm concentration is reached, the buzzer will alarm immediately, the relay will close immediately, and the screen will display the current concentration value in real time.

Schematic PCB

STM32

Introduction: STM32 minimum system for beginners to draw on the road

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Digital thermometer based on DS18B20

Introduction: Digital thermometer based on DS18B20 temperature sensor. Use STC15W204S-SOP8 microcontroller as the system master; use TM1650 to drive the 4-digit digital tube to display the temperature value.

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nrf52832DEV

Introduction: This project is Nordic nrf52832 development board

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[Meiyan Electronics Production] HLW8032 single-phase power acquisition (UART) module-LMY-03

Introduction: Relays are not used in many places, so this module deletes the relay part based on LYM-01.

Schematic PCB

[Made by Meiyan Electronics] HLW8032 single-phase power acquisition (UART) module-LYM-01

Introduction: Use Heli's HLW8032 single-phase power acquisition chip to collect electrical parameters such as voltage, current, power, etc. for household AC power, and reserve the relay to control the output on and off.

Schematic PCB

S00004 Three-phase energy measurement module based on HT7036

Introduction: HT7036 collects the voltage and current of three-phase alternating current

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Electromagnetic capacitor mounting plate

Introduction: Hehe, the strange PCB used in making a small smart car, electromagnetic tracking, is for reference only. . .

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PT100 temperature measurement circuit

Introduction: PT100 temperature measurement circuit, bridge + LM358 operational amplifier measurement signal

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Design of orchard environment detection system based on lora

Introduction: Design an expansion board for the NUCLEO-G071RB development board. The expansion boards contain LORA modules and related sensors and other interfaces, which can realize functions such as lora-based environmental information detection and uploading to cloud servers.

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12. Indoor harmful gas monitoring

Introduction: Outsiders are useless

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high speed rail scene

Introduction: Small cars in the high-speed rail era

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[Successful actual measurement] MQ-2 solution verification board

Introduction: This project is used to verify the scheme verification design of LCSC’s gas detection module MQ-2 (LCSC No. C99296)

Schematic PCB

[Successful actual test] Water leakage detection alarm

Introduction: For some reason, the fish tank at home always overflows. Often by the time it is discovered, the room is already ready for swimming. In order to prevent such accidents from happening again (for sure), I designed this low-cost, efficient water leakage detection alarm.

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[Successful test] Expansion board based on arduino UNO

Introduction: Expansion board based on arduino UNO

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[To be soldered] DHT11 solution verification board

Introduction: This project is used to verify the scheme verification design of LCSC’s temperature and humidity detection module DHT11 (LCSC No. C117051) https://item.szlcsc.com/118309.html

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RT1064 driver part copy copy

Introduction:KJKJ

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Geiger counter

Introduction: Geiger Counter

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USB differential analog signal sampling front-end made with CH552+HX712

Introduction: Anyway, I just don’t want to spend money to make something like this.

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Analog sampling toys made with CH552+ADS1255

Introduction: True random number generator v2, v1 at https://oshwhub.com/libc0607/hx71x-tmr-afe-v1

Schematic PCB