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ESP32 - Touch Sensor - Servo Motor
This tutorial instructs you how to use ESP32 to . In detail:
- If touch sensor is touched, rotate servo motor to 90 degree
- If touch sensor is touched again, rotate servo motor back to 0 degree.
That process is repeated.
Hardware Used In This Tutorial
| 1 | × | ESP-WROOM-32 Dev Module | |
| 1 | × | Micro USB Cable | |
| 1 | × | Touch Sensor | |
| 1 | × | Servo Motor | |
| 1 | × | Breadboard | |
| 1 | × | Jumper Wires | |
| 1 | × | (Optional) DC Power Jack | |
| 1 | × | (Optional) ESP32 Screw Terminal Adapter |
Or you can buy the following sensor kit:
| 1 | × | DIYables Sensor Kit 30 types, 69 units |
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Introduction to Servo Motor and Touch Sensor
We have specific tutorials about servo motor and touch sensor. Each tutorial contains detailed information and step-by-step instructions about hardware pinout, working principle, wiring connection to ESP32, ESP32 code... Learn more about them at the following links:
Wiring Diagram
This image is created using Fritzing. Click to enlarge image
ESP32 Code - Touch Sensor Controls Servo Motor
/*
* This ESP32 code is created by esp32io.com
*
* This ESP32 code is released in the public domain
*
* For more detail (instruction and wiring diagram), visit https://esp32io.com/tutorials/esp32-touch-sensor-servo-motor
*/
#include <Servo.h>
#define TOUCH_SENSOR_PIN 18 // ESP32 pin GPIO18 connected to touch sensor's pin
#define SERVO_PIN 26 // ESP32 pin GPIO26 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 Instructions
- If this is the first time you use ESP32, see how to setup environment for ESP32 on Arduino IDE.
- Do the wiring as above image.
- Connect the ESP32 board to your PC via a micro USB cable
- Open Arduino IDE on your PC.
- Select the right ESP32 board (e.g. ESP32 Dev Module) and COM port.
- On Arduino IDE, Navigate to Tools Manage Libraries
- Type ESP32Servo on the search box, then look for the keypad library by Mark Stanley, Alexander Brevig
- Click Install button to install servo motor library for ESP32.
- Copy the above code and paste it to Arduino IDE.
- Compile and upload code to ESP32 board by clicking Upload button on Arduino IDE
- Touch the touch sensor several times.
- See the change of servo motor
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