The objective of this project is to create a temperature control system using an Arduino microcontroller that regulates a fan motor's speed based on the ambient temperature. Additionally, the system provides visual feedback using an RGB LED and auditory feedback using a buzzer.
#include <Adafruit_LiquidCrystal.h> #define TEMPERATURE A0 #define MOTOR 3 #define BUZZER_PIN 4 Adafruit_LiquidCrystal lcd(0); // define RGB LED pins int redPin = 9; int greenPin = 11; int bluePin = 10; // define button pin int interruptPin = 2; // define interrupt variables volatile bool state = false; volatile int seconds = 0; unsigned long lastDebounceTime = 0; void setup() { Serial.begin(9600); lcd.begin(16, 2); pinMode(MOTOR, OUTPUT); pinMode(redPin, OUTPUT); pinMode(greenPin, OUTPUT); pinMode(bluePin, OUTPUT); pinMode(interruptPin, INPUT_PULLUP); attachInterrupt(digitalPinToInterrupt(interruptPin), button_pressed, FALLING); pinMode(BUZZER_PIN, OUTPUT); } void loop() { if (state) { lcd.setCursor(0, 0); lcd.setBacklight(1); lcd.print("Turned ON: "); lcd.setCursor(11, 0); lcd.print(" "); lcd.setCursor(11, 0); lcd.print(seconds); int rawTemp = analogRead(TEMPERATURE); int temperature = map(rawTemp, 20, 358, -40, 125); int speed = speedDecider(temperature); analogWrite(MOTOR, speed); setLight(temperature); lcd.setCursor(0, 1); lcd.print("T: "); lcd.setCursor(5, 1); lcd.print(" "); lcd.setCursor(3, 1); lcd.print(temperature); lcd.setCursor(7, 1); lcd.print("S: "); lcd.setCursor(12, 1); lcd.print(" "); lcd.setCursor(10, 1); lcd.print(speed); } else { analogWrite(MOTOR, 0); setColor(0, 0, 0); digitalWrite(BUZZER_PIN, LOW); lcd.setCursor(0, 0); lcd.print("Turned OFF: "); lcd.setCursor(12, 0); lcd.print(" "); lcd.setCursor(12, 0); lcd.print(seconds); lcd.setCursor(0, 1); lcd.print(" "); } } void button_pressed() { unsigned long currentTime = millis(); if (currentTime - lastDebounceTime > 50) { state = !state; seconds = millis() / 1000; Serial.println(seconds); lastDebounceTime = currentTime; } } int speedDecider(int temp) { if (temp < 10) return 0; else if (temp > 60) return 255; else return map(temp, 10, 60, 0, 255); } void setLight(int temp) { // green for cool if (temp <= 30) setColor(0, 255, 0); else if (temp >= 80) { // blink red LED static bool toggle = false; if (toggle) { setColor(255, 0, 0); digitalWrite(BUZZER_PIN, HIGH); } else { // turn off the LED setColor(0, 0, 0); digitalWrite(BUZZER_PIN, LOW); } toggle = !toggle; } else { setColor(255, 20, 0); // orange for moderate digitalWrite(BUZZER_PIN, LOW); } } void setColor(int redValue, int greenValue, int blueValue) { analogWrite(redPin, redValue); analogWrite(greenPin, greenValue); analogWrite(bluePin, blueValue); } For any inquiries or feedback, please contact the project team at:
@Egemen Eroglu
@Ece Akdeniz