Lights Off

Note

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Kit purchase

Looking for parts? Check out our all-in-one kits below — packed with components, beginner-friendly guides, and tons of fun.

../_images/elite_explore_kit.png

Name

Includes Arduino board

PURCHASE LINK

Ultimate Sensor Kit

Arduino Uno R4 Minima

BUY

Elite Explorer Kit

Arduino Uno R4 WiFi

BUY

3 in 1 Ultimate Starter Kit

Arduino Uno R4 Minima

BUY

Universal Maker Sensor Kit

×

BUY

Course Introduction

In this lesson, you will learn how to use Arduino along with servo motor, buttons, LED, and resistor to create a light play game.

Pressing the button to start.

Note

If this is your first time working with an Arduino project, we recommend downloading and reviewing the basic materials first.

Required Components

In this project, we need the following components:

SN

COMPONENT INTRODUCTION

QUANTITY

PURCHASE LINK

1

Arduino UNO R4 Minima/Arduino UNO R4 WIFI

1

BUY

2

USB Type-C cable

1

3

Breadboard

1

BUY

4

Wires

Several

BUY

5

220Ω resistor

1

BUY

6

Button

2

BUY

7

LED

1

BUY

8

Digital Servo Motor

1

BUY

Wiring

../_images/lights_off_bb.png

Common Connections:

  • LED

    • Connect the LED cathode to the negative power bus on the breadboard, and the LED anode to a 1kΩ resistor then to 5 on the Arduino.

  • Button-ON

    • Connect to breadboard’s negative power bus.

    • Connect to 2 on the Arduino.

  • Button-OFF

    • Connect to breadboard’s negative power bus.

    • Connect to 3 on the Arduino.

  • Digital Servo Motor

    • Connect to breadboard’s positive power bus.

    • Connect to breadboard’s negative power bus.

    • Connect to 9 on the Arduino.

Writing the Code

Note

  • You can copy this code into Arduino IDE.

  • Don’t forget to select the board(Arduino UNO R4 WIFI/Minima) and the correct port before clicking the Upload button.

#include <Servo.h>

// Pins
const int BUTTON_ON_PIN = 2;
const int BUTTON_OFF_PIN = 3;
const int LED_PIN = 5;
const int SERVO_PIN = 9;

// Servo angles
const int SERVO_HOME_ANGLE = 0;
const int SERVO_PRESS_ANGLE = 30;

// Timing
const unsigned long WAIT_BEFORE_PRESS = 2000;
const unsigned long SERVO_PRESS_TIME = 600;
const unsigned long DEBOUNCE_DELAY = 200;

Servo switchServo;

bool lightOn = false;
bool servoTriggered = false;

bool lastButtonOnState = HIGH;
bool lastButtonOffState = HIGH;

unsigned long lightOnTime = 0;
unsigned long lastButtonOnTime = 0;
unsigned long lastButtonOffTime = 0;

void setup() {
  pinMode(BUTTON_ON_PIN, INPUT_PULLUP);
  pinMode(BUTTON_OFF_PIN, INPUT_PULLUP);
  pinMode(LED_PIN, OUTPUT);

  switchServo.attach(SERVO_PIN);
  switchServo.write(SERVO_HOME_ANGLE);

  digitalWrite(LED_PIN, LOW);
}

void loop() {
  handleButtons();

  if (lightOn && !servoTriggered) {
    if (millis() - lightOnTime >= WAIT_BEFORE_PRESS) {
      pressOffButton();
      servoTriggered = true;
    }
  }
}

void handleButtons() {
  bool currentButtonOnState = digitalRead(BUTTON_ON_PIN);
  bool currentButtonOffState = digitalRead(BUTTON_OFF_PIN);
  unsigned long now = millis();

  if (lastButtonOnState == HIGH && currentButtonOnState == LOW) {
    if (now - lastButtonOnTime > DEBOUNCE_DELAY) {
      lightOn = true;
      servoTriggered = false;
      lightOnTime = now;
      digitalWrite(LED_PIN, HIGH);
      lastButtonOnTime = now;
    }
  }

  if (lastButtonOffState == HIGH && currentButtonOffState == LOW) {
    if (now - lastButtonOffTime > DEBOUNCE_DELAY) {
      lightOn = false;
      digitalWrite(LED_PIN, LOW);
      switchServo.write(SERVO_HOME_ANGLE);
      lastButtonOffTime = now;
    }
  }

  lastButtonOnState = currentButtonOnState;
  lastButtonOffState = currentButtonOffState;
}

void pressOffButton() {
  switchServo.write(SERVO_PRESS_ANGLE);
  delay(SERVO_PRESS_TIME);

  if (digitalRead(BUTTON_OFF_PIN) == LOW) {
    lightOn = false;
    digitalWrite(LED_PIN, LOW);
  }

  switchServo.write(SERVO_HOME_ANGLE);
}