Google Assistant based 4 Channel Relay Control (STEP by STEP) | ESP8266-01

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This project is designed to use all the input-output pins of ESP-01. In the ESP-01 module we have four pins GPIO0, GPIO2, Tx (GPIO1), and Rx(GPIO3). So, after defining all these pins as OUTPUT we can use this pin to ON/OFF relay. And after controlling the relay we can attach AC devices to this relay so that we can control this device.
This video demonstrates how to use all the GPIO of the ESP8266-01 Module. You may say that extended GPIO pins for ESP-01.

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