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Lesson 22: Touch Sensor Module

In this lesson, you’ll learn how to use a touch sensor with an ESP32 Development Board. We’ll see how touching the sensor sends a signal to the ESP32, triggering a response displayed through serial communication. This project is ideal for beginners and provides hands-on experience with digital inputs and serial output on the ESP32 platform. You’ll develop a foundational understanding of how sensors interact with microcontrollers, which is essential for building interactive hardware projects.

Required Components

In this project, we need the following components.

It’s definitely convenient to buy a whole kit, here’s the link:

Name	ITEMS IN THIS KIT	LINK
Universal Maker Sensor Kit	94	Universal Maker Sensor Kit

You can also buy them separately from the links below.

Component Introduction	Purchase Link
ESP32 & Development Board (ESP32 Board)	BUY
Touch Sensor Module	BUY
Breadboard	BUY

Wiring

Code

Code Analysis

1. Setting Up the Pin and Serial Communication

   • The touch sensor is connected to pin 25 of the ESP32, and this pin is configured as an input.

   • The Serial.begin(9600); initializes serial communication at a baud rate of 9600 bits per second.

   
   

   const int sensorPin = 25;
   
   void setup() {
     pinMode(sensorPin, INPUT);     // Set the sensor pin as input
     Serial.begin(9600);            // Start the serial communication
   }
   

2. Reading the Sensor and Sending Data to Serial Monitor

   • The loop() function continuously checks the state of the touch sensor.

   • digitalRead(sensorPin) reads the digital value (1 or 0) from the sensor pin.

   • If the sensor is touched (value 1), it prints “Touch detected!” to the Serial Monitor.

   • If not touched (value 0), it prints “No touch detected…”.

   • The delay(100); helps in debouncing the sensor, preventing multiple rapid readings.

   
   

   void loop() {
     if (digitalRead(sensorPin) == 1) {  // If the sensor is touched
       Serial.println("Touch detected!");
     } else {
       Serial.println("No touch detected...");
     }
     delay(100);  // Wait for a short period to avoid rapid reading of the sensor
   }