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Project Source Code is very clean and easy to understand but you need to do some minor changes before uploading your source code into a module.
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The only difference is the GPIO2 pin of is connected to the INPUT of Relay.
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The rest of the connections are made accordingly (GND to GND, TX pin to TX of Arduino). Connect the VCC and GND to 3.3V (the ESP-01 module is not compatible with 5V so 3.3V is preferred). These are VCC, GND, TX, RX, RST, CH_PD, GPIO0 and GPIO2. The Relay module used here is an Active LOW one. The relay module can be used with AC supply, however, in this project, we have used a small 5V bulb to show output. The Relay module used in this project has two channels but only one channel shall be used.
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For more information Read: Learn How to Setup the Wifi Module ESP8266 by Using Just Arduino IDE The client will send instructions or commands through the Android App which the ESP8266 will receive and will carry out the operation. Resistors (1KΩ and 2.2KΩ) – both are ¼ Watt ResistorsĮSP8266 (ESP-01) Wi-Fi module will be used to connect your Relay and to control it through your Wi-Fi network.You can see that I’ve used a single channel relay module in the circuit diagram. The circuit diagram for the project “Control a Relay using ESP8266” is shown in the image below. This app can be installed on your android device and then by connecting it to ESp8266, you can control a Relay through the same Wi-Fi connection your phone uses. We will also use an app developed by MIT App Inventor through an Android device in this project. All these are essentially based on ESP8266, the only difference is the number of GPIO pins. Several other modules like ESP-02, ESP-07 were also released. It can be programmed by using Arduino, NodeMCU IDE or ESP8266 SDK. ESP8266 (ESP-01) is a small module that allows microcontrollers to connect to a Wi-Fi network and make simple IP (Internet Protocol) connections.