Arduino Projects (8-15) - ATL's Workspace

8. Gas Watchdog

Code

int mq2Pin = A0;
int buzzerPin = 8;
int threshold = 300;

void setup() {
  pinMode(buzzerPin, OUTPUT);
  Serial.begin(9600);
}

void loop() {
  int gasValue = analogRead(mq2Pin);
  Serial.print("Gas Level: ");
  Serial.println(gasValue);
  
  if (gasValue > threshold) {
    tone(buzzerPin, 1000);
    delay(200);
    noTone(buzzerPin);
    delay(200);
  }
  delay(100); 
}

Info

"Gas Watchdog" - MQ2-based gas leak detector that sounds an alarm when hazardous gas levels are detected.

9. Booze Detector

Code

int mq3Pin = A0;
int ledPin = 13;
int threshold = 400;

void setup() {
  pinMode(ledPin, OUTPUT);
  Serial.begin(9600);
}

void loop() {
  int alcoholValue = analogRead(mq3Pin);
  Serial.print("Alcohol Level: ");
  Serial.println(alcoholValue);
  
  if (alcoholValue > threshold) {
    digitalWrite(ledPin, HIGH);
  } else {
    digitalWrite(ledPin, LOW);
  }
  delay(1000);
}

Info

"Booze Detector" - MQ3 alcohol sensor that lights an LED when alcohol vapors are present.

10. Air Quality Check

Code

int mq135Pin = A0;

void setup() {
  Serial.begin(9600);
}

void loop() {
  int airQuality = analogRead(mq135Pin);
  Serial.print("Air Quality: ");
  Serial.println(airQuality);
  
  if (airQuality > 300) {
    Serial.println("Poor Air Quality!");
  } else {
    Serial.println("Air Quality OK");
  }
  delay(1000);
}

Info

"Air Quality Check" - MQ135 sensor-based system that monitors air pollution levels and warns of poor air quality.

11. Gas Leak Sentinel

Code

int mq5Pin = A0;
int buzzerPin = 8;
int threshold = 350;

void setup() {
  pinMode(buzzerPin, OUTPUT);
  Serial.begin(9600);
}

void loop() {
  int gasValue = analogRead(mq5Pin);
  Serial.print("Gas Level: ");
  Serial.println(gasValue);
  
  if (gasValue > threshold) {
    tone(buzzerPin, 1000);
    delay(1000);
    noTone(buzzerPin);
  }
  delay(500);
}

Info

"Gas Leak Sentinel" - MQ5-based natural gas detector with buzzer alerts for hazardous leaks.

12. Motion Guard

Code

int pirPin = 2;
int ledPin = 13;

void setup() {
  pinMode(ledPin, OUTPUT);
  pinMode(pirPin, INPUT);
  Serial.begin(9600);
}

void loop() {
  int motion = digitalRead(pirPin);
  if (motion == HIGH) {
    digitalWrite(ledPin, HIGH);
    Serial.println("Motion detected!");
  } else {
    digitalWrite(ledPin, LOW);
  }
  delay(100);
}

Info

"Motion Guard" - PIR motion sensor that triggers an LED when movement is detected, useful for security.

13. Plant Hydration Monitor

Code

int soilPin = A0;

void setup() {
  Serial.begin(9600);
}

void loop() {
  int moisture = analogRead(soilPin);
  Serial.print("Soil Moisture: ");
  Serial.println(moisture);
  
  if (moisture > 700) {
    Serial.println("Soil is too dry!");
  } else if (moisture > 400) {
    Serial.println("Soil moisture is good");
  } else {
    Serial.println("Soil is too wet!");
  }
  delay(1000);
}

Info

"Plant Hydration Monitor" - Soil moisture sensor that checks if plants need watering and alerts when soil is too dry.

14. Rain Alert

Code

int rainPin = A0;
int buzzerPin = 8;
int threshold = 500;

void setup() {
  pinMode(buzzerPin, OUTPUT);
  Serial.begin(9600);
}

void loop() {
  int rainValue = analogRead(rainPin);
  Serial.print("Rain Level: ");
  Serial.println(rainValue);
  
  if (rainValue < threshold) {
    tone(buzzerPin, 1000);
    delay(500);
    noTone(buzzerPin);
    delay(500);
  }
  delay(100);
}

Info

"Rain Alert" - Rain sensor that detects water and triggers a buzzer, useful for weather monitoring.

15. Motor Commander

Code

int enA = 9;
int in1 = 8;
int in2 = 7;

void setup() {
  pinMode(enA, OUTPUT);
  pinMode(in1, OUTPUT);
  pinMode(in2, OUTPUT);
}

void loop() {
  // Rotate clockwise
  digitalWrite(in1, HIGH);
  digitalWrite(in2, LOW);
  analogWrite(enA, 200); // Speed control
  delay(2000);
  
  // Stop
  digitalWrite(in1, LOW);
  digitalWrite(in2, LOW);
  delay(1000);
  
  // Rotate counter-clockwise
  digitalWrite(in1, LOW);
  digitalWrite(in2, HIGH);
  analogWrite(enA, 200); // Speed control
  delay(2000);
  
  // Stop
  digitalWrite(in1, LOW);
  digitalWrite(in2, LOW);
  delay(1000);
}

Info

"Motor Commander" - DC motor controller using an L298N driver to change speed and direction.