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ESP8266 01 + 5V WiFi Relay Module electronics compatible with most microcontroller GPIO compatible with most microcontroller GPIO pins and open collector outputs 3 pins) Pin Configuration Pin 1: Input Pin 2: Ground Pin 3: Output Dimensions ~10 Optocoupler Isolation: Relay driver circuit includes optocoupler isolation to protect the ESP8266 from relay switching noise and back EMF and smart switching applications
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