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ESP32 - Button - Servo Motor
This tutorial instructs you how to use ESP32 with button and servo motor. In detail, we will learn how to do:
- ESP32 automatically rotates servo motor to 90° if the button is pressed.
- ESP32 automatically rotates servo motor to 0° if the button is pressed again
That process is repeated.
Hardware Used In This Tutorial
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Wiring Diagram
This image is created using Fritzing. Click to enlarge image
If you're unfamiliar with how to supply power to the ESP32 and other components, you can find guidance in the following tutorial: How to Power ESP32.
ESP32 Code - Button Controls Servo Motor
Why need to debounce for the button? ⇒ see ESP32 - Button Debounce tutorial
/*
* 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-button-servo-motor
*/
#include <Servo.h>
#include <ezButton.h>
#define BUTTON_PIN 21 // ESP32 pin GPIO21 connected to button's pin
#define SERVO_PIN 26 // ESP32 pin GPIO26 connected to servo motor's pin
ezButton button(BUTTON_PIN); // create ezButton object that attach to pin 7;
Servo servo; // create servo object to control a servo
// variables will change:
int angle = 0; // the current angle of servo motor
void setup() {
Serial.begin(9600); // initialize serial
button.setDebounceTime(50); // set debounce time to 50 milliseconds
servo.attach(SERVO_PIN); // attaches the servo on pin 9 to the servo object
servo.write(angle);
}
void loop() {
button.loop(); // MUST call the loop() function first
if (button.isPressed()) {
// change angle of servo motor
if (angle == 0)
angle = 90;
else if (angle == 90)
angle = 0;
// control servo motor arccoding to the angle
Serial.print("The button is pressed => rotate servo to ");
Serial.print(angle);
Serial.println("°");
servo.write(angle);
}
}
Quick Instructions
- If this is the first time you use ESP32, see how to setup environment for ESP32 on Arduino IDE.
- Install ezButton library. See How To
- Click to the Libraries icon on the left bar of the Arduino IDE.
- Type ServoESP32 on the search box, then look for the servo library by Jaroslav Paral. Please be aware that both version 1.1.1 and 1.1.0 are affected by bugs. Kindly choose a different version.
- 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
- Press the button several times
- See the servo motor's rotation
Video Tutorial
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