In order to protect it from overheat, high voltage and high current I've used a 73☌ thermal fuse, a 250VAC varistance and a 315mA fuse: It takes 100 - 240VAC and converts it to 5VDC. In order to convert the power to 5V, I've used the HLK-PM01: The ESP8266 uses 3.3V, and the relay needs a 5V input to work. It has 2 digital outputs, we're only going to use 1 of them (GPIO2):įor the relay, I've used a single relay board: Ok so I decided to use the ESP8266-01 for its cheap price and its small size. ESP8266 WiFi relay switch (Arduino IDE) (Uses the EasyIoT web interface instead of the Blynk app in my case).WiFi / Internet Controlled Relays using ESP8266 (This one uses a power supply and an adapter to power the switch).I used the 2 following well-explained tutorials before doing this project: I'd like to point that I'm new to this field, so I might not use the correct terms: be gentle! Please note that I haven't printed the version 2, so I have no idea if it actually works. I'll note the improvements that can be made in this tutorial, along with the version 2 of the PCB. Since this is one of my first projects of this kind, I made a few mistakes that I realized afterwards. The end result is shown above: you simply connect the male plug to the wall socket, your device that you want to control to the female plug, and voilà! You can control it with your phone. The interface between the switch and the phone will be managed by the Blynk app. The components won't be put on a breadboard, but rather soldered on a PCB, in order to make the switch as small as possible, and to be able to handle the high power. And I don't want to pay more than a total of $30 per switch, since I want to make a dozen of them. I want to be able to turn it on/off at a specific day and time using a timer.

I want to be able to make groups of switch, and turn them all on/off by the push of 1 button. The switch will need to connect to 1 of 2 preprogrammed wifi.

I don't want the switch to rely on a battery. The idea is the following: I want to be able to turn on/off several lights or devices connected to the power supply from my phone. In this tutorial I'm going to show you how I made a wifi switch from scratch (or almost) using the well known ESP8266.

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