Arduino - Button - Servo Motor

We will learn:

That process is repeated.

The tutorial includes two main parts:

Hardware Required

1×Arduino UNO or Genuino UNO
1×USB 2.0 cable type A/B
1×Button
1×Servo Motor
1×Breadboard
n×Jumper Wires
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About Servo Motor and Button

If you do not know about servo motor and button (pinout, how it works, how to program ...), learn about them in the following tutorials:

Wiring Diagram

Arduino Button Servo Motor Wiring Diagram

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Arduino Code - Button Controls Servo Motor Without Debouncing

/* * Created by ArduinoGetStarted.com * * This example code is in the public domain * * Tutorial page: https://arduinogetstarted.com/tutorials/arduino-button-servo-motor */ #include <Servo.h> // constants won't change const int BUTTON_PIN = 7; // Arduino pin connected to button's pin const int SERVO_PIN = 9; // Arduino 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 arduino 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

  • Connect Arduino to PC via USB cable
  • Open Arduino IDE, select the right board and port
  • Copy the above code and open with Arduino IDE
  • Click Upload button on Arduino IDE to upload code to Arduino
  • 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.

Arduino Code - Button Controls Servo Motor With Debouncing

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

/* * Created by ArduinoGetStarted.com * * This example code is in the public domain * * Tutorial page: https://arduinogetstarted.com/tutorials/arduino-button-servo-motor */ #include <Servo.h> #include <ezButton.h> // constants won't change const int BUTTON_PIN = 7; // Arduino pin connected to button's pin const int SERVO_PIN = 9; // Arduino 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

  • Install ezButton library. See How To
  • Copy the above code and open with Arduino IDE
  • Click Upload button on Arduino IDE to upload code to Arduino
  • Press button several times
  • See the change of servo motor

Button and Servo Motor on Commercial Products

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

  • Ring Video Doorbell with HD Video
  • Amazon Smart Speaker - Echo Dot
  • TP-Link AC1750 Smart WiFi Router - Dual Band Gigabit Wireless Internet Routers
  • Robotic Arm Kit for Arduino
  • Otto DIY Robot Builder Kit

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