Relay Module 8 Channels - 5V) 3v This is a simple to

This is a simple to use hydrogen sensor

Application: production of electronic pointer pens

Size:  M6

The D1 R2 is a mini wifi board based on ESP-8266EX

Relay Module 8 Channels - 5V) 3v This is a simple toIntroduction : It is a 8 channel relay board, which can be controlled directly by a wide range of microcontrollers such as Arduino, AVR, PIC, ARM, PLC, etc. It is also able to control various appliances and other equipments with large current. used where it is necessary to control a circuit by a low power signal (with complete electrical isolation between control and controlled circuits), or where several circuits must be controlled by one signal.