ESP32 - Touch Sensor - Servo Motor

We will learn:

That process is repeated.

Hardware Required

1×ESP-WROOM-32 Dev Module
1×Micro USB Cable
1×Touch Sensor
1×Servo Motor
n×Jumper Wires
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About Servo Motor and Touch Sensor

If you do not have knowledge of servo motor and touch sensor (pinout, how they work, how to connect them to ESP32, how to program for them...), learn about them in the following tutorials:

Wiring Diagram

ESP32 Touch Sensor Servo Motor Wiring Diagram

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ESP32 Code - Touch Sensor Controls Servo Motor

/* * Created by esp32io.com * * This example code is in the public domain * * Tutorial page: https://esp32io.com/tutorials/esp32-touch-sensor-servo-motor */ #include <Servo.h> // constants won't change const int TOUCH_SENSOR_PIN = 7; // ESP32 pin connected to touch sensor's pin const int SERVO_PIN = 9; // ESP32 pin connected to servo motor's pin Servo servo; // create servo object to control a servo // variables will change: int angle = 0; // the current angle of servo motor int lastTouchState; // the previous state of touch sensor int currentTouchState; // the current state of touch sensor void setup() { Serial.begin(9600); // initialize serial pinMode(TOUCH_SENSOR_PIN, INPUT); // set ESP32 pin to input mode servo.attach(SERVO_PIN); // attaches the servo on pin 9 to the servo object servo.write(angle); currentTouchState = digitalRead(TOUCH_SENSOR_PIN); } void loop() { lastTouchState = currentTouchState; // save the last state currentTouchState = digitalRead(TOUCH_SENSOR_PIN); // read new state if(lastTouchState == LOW && currentTouchState == HIGH) { Serial.println("The sensor is touched"); // change angle of servo motor if(angle == 0) angle = 90; else if(angle == 90) angle = 0; // control servo motor arccoding to the angle servo.write(angle); } }

Quick Steps

  • If this is the first time you use ESP32, see how to setup environment for ESP32 on Arduino IDE
  • Connect the ESP32 board to your PC via a micro USB cable
  • Open Arduino IDE, select the right ESP32 board and COM port
  • Copy the above code and paste it to Arduino IDE
  • Click Upload button on Arduino IDE to compile and upload code to ESP32 board
  • Touch the touch sensor several times.
  • See the change of servo motor

Video Tutorial

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