ESP32 - Button - Servo Motor

We will learn:

That process is repeated.

The tutorial includes two main parts:

Hardware Required

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

If you do not have knowledge of servo motor and button (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 Button Servo Motor Wiring Diagram

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ESP32 Code - Button Controls Servo Motor Without Debouncing

/* * Created by esp32io.com * * This example code is in the public domain * * Tutorial page: https://esp32io.com/tutorials/esp32-button-servo-motor */ #include <Servo.h> // constants won't change const int BUTTON_PIN = 7; // ESP32 pin connected to button'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 lastButtonState; // the previous state of button int currentButtonState; // the current state of button void setup() { Serial.begin(9600); // initialize serial pinMode(BUTTON_PIN, INPUT_PULLUP); // set ESP32 pin to input pull-up mode servo.attach(SERVO_PIN); // attaches the servo on pin 9 to the servo object servo.write(angle); currentButtonState = digitalRead(BUTTON_PIN); } void loop() { lastButtonState = currentButtonState; // save the last state currentButtonState = digitalRead(BUTTON_PIN); // read new state if(lastButtonState == HIGH && currentButtonState == LOW) { Serial.println("The button is pressed"); // 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
  • Press the button several times.
  • See the change of servo motor

※ NOTE THAT:

In practice, the above code does not work correctly sometimes. To make it always work correctly, we need to debounce for the button. Debouncing for the button is not easy for beginners. Fortunately, thanks to the ezButton library, We can do it easily.

ESP32 Code - Button Controls Servo Motor With Debouncing

Why do we need debouncing? ⇒ see ESP32 - Button Debounce tutorial

/* * Created by esp32io.com * * This example code is in the public domain * * Tutorial page: https://esp32io.com/tutorials/esp32-button-servo-motor */ #include <Servo.h> #include <ezButton.h> // constants won't change const int BUTTON_PIN = 7; // ESP32 pin connected to button's pin const int SERVO_PIN = 9; // ESP32 pin 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()) { Serial.println("The button is pressed"); // 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
  • Install ezButton library. See How To
  • Copy the above code and paste it to Arduino IDE
  • Click Upload button on Arduino IDE to compile and upload code to ESP32 board
  • Press button several times
  • See the change of servo motor

Video Tutorial

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Button and Servo Motor on Commercial Products

Most electronic products have a reset button. Additionally, the button also keeps other functionalities in many products.

※ NOTE THAT:

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