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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
| 1 | × | ESP-WROOM-32 Dev Module | |
| 1 | × | Micro USB Cable | |
| 1 | × | Button | |
| 1 | × | Servo Motor | |
| 1 | × | Jumper Wires | |
| 1 | × | (Optional) 5V Power Adapter | |
| 1 | × | (Optional) DC Power Jack | |
| 1 | × | (Optional) ESP32 Screw Terminal Adapter |
One of the following breadboard:
| 1 | × | Full-sized 830-Point Breadboard | |
| 1 | × | Half-sized 400-point Breadboard | |
| 1 | × | Mini-sized 170-point Breadboard | |
| 1 | × | All-sized Breadboard Kit |
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Wiring Diagram
This image is created using Fritzing. Click to enlarge image
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 GIOP21 connected to button's pin
#define SERVO_PIN 26 // ESP32 pin GIOP26 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
- 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
- Press the button several times
- See the servo motor's rotation
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