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Ai Thinker ESP 07S ESP8266 Serial WiFi Module electronics and cleanroom automation environments and cleanroom automation environments Pin Function Description Pin 1 Coil (+) Connect to +12V DC through a switching transistor or directly from a control signal Pin 2 Coil () Connect to ground (GND) of the 12V supply Pin 3 Common (COM) Common terminal connect to the load power source Pin 4 Normally Open (NO) Connects Frequently Asked Questions ADC (1 channel Ultra Compact Form Factor: At just 17mm x 16mm
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