ESP32 Wi-Fi Switch With Capacitive Touch

Here I will provide to you everything you need to know to make a Smart Switch to use to turn on and off anything around your house.

Supplies

ESP32

5v Relay module

5v DC Power supply 220V to 5V 2A

Relay Explanation

To begin a relay is an electrical component that acts like a switch but turns on and off when electricity is applied to its coil once its coil is activated it becomes magnetic and attracts the contact and opens the switch. The relay module we are using has 3 input and 3 output terminals. The 3 input terminals are 5v, GND, and input from the microcontroller. The 3 output terminals are COM, NO, and NC. COM or common is the terminal that will take electricity from the 220V live. The NO or normally open terminal will send out 220V once the relay is activated. But for the NC or Normally closed terminal it won't be needed in this project but what it does is that it can send out 220V when the relay isn't activated.

ESP32/Microcontroller Explanation

A ESP32 is a microcontroller capable of many things mainly sending and recivieng electrical signals to interact with sensors, actuators, and other devices like all microcontrollers but with the addtition to Wi-Fi and Bluetooth. The ESP32 can be programed with various ways but the easiset and most common way is using the Arduino IDE which is a free software for programing microcontrollers.

Power Supply Explantion

There are various types of power supplies with various voltage inputs and outputs. But for now, the power supply is what supplies the electricity to power our project. In this case 220V AC to 5V 2A DC.

Programing

#include <Arduino.h>

int v12State = 0;

#define BLYNK_TEMPLATE_ID "Your Template ID"

#define BLYNK_TEMPLATE_NAME "Your Template Name"

#define BLYNK_AUTH_TOKEN "Your Authentication Token"

#define BLYNK_PRINT Serial

#include <WiFi.h>

#include <WiFiClient.h>

#include <BlynkSimpleEsp32.h>

#include <WiFiClient.h>

#include <BlynkSimpleEsp32.h>

char auth[] = "Your Authentication Token";

char ssid[] = "Wifi SSID";

char pass[] = "Wifi Password";

BLYNK_WRITE(V12) {

v12State = param.asInt();

digitalWrite(26, v12State);

}

void setup() {

Serial.begin(115200);

Blynk.begin(auth, ssid, pass, "blynk.cloud", 80);

pinMode(26, OUTPUT);

}

void loop() {

Blynk.run();

if (touchRead(13) < 21) {

v12State = !v12State;

digitalWrite(26, v12State);

Blynk.virtualWrite(V12, v12State);

delay(500);

}

Serial.println(touchRead(13));

}

Here is the Arduino code make sure to install the Blynk library it is available on the Arduino IDE just search for Blynk and install.

Setting Up the App

Open the Blynk website https://blynk.io/ and sign up, then select "Developer Zone", then "My Templates" and create a new template. After creating the template open it and go to "Datastreams" then add a data stream. And set it as PIN V12. Then press "Save And Apply". Then on your mobile device sign in with the same account and you will find your template press on it add a button and set the Datastream to the one you made.

Wiring

Here is the wiring diagram always make sure when doing any wiring to not have any power connected so you don't risk getting electrocuted.

Done

That's it you're done have fun creating projects.