How can i connect the as608(finger sensor )pins to esp8266
From AS608 Optical Fingerprint Reader Sensor Module For Arduino Mega Uno AVR STM32 | eBay
The sensor has a serial interface
Connection:
pin #2 is IN from sensor (GREEN wire)
pin #3 is OUT from arduino (WHITE wire)
5V connect sensor (Red wire)
GND connect sensor (Black wire)
You will need a voltage level converter between the ESP8266 and the sensor
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