Lesson 7: Activity 2 (Temperature Warning System)

Lesson 7
Activity 2 - Temperature Warning System

Materials Needed:

• Arduino Board
• Breadboard
• USB Cable
• Laptop
• Temperature Sensor
• Buzzer
• 1 x 330Ω
• 1 x LED
• 9 x Jumper Wires

Codes:

int analogVal;

const int tempPin = A0;

float voltage;

float temperature;

const int led = ?;

const int buzzer = 6;

void setup()

{

  pinMode(tempPin, INPUT);

  pinMode(led,?); 

  pinMode(buzzer,?);

  Serial.begin(9600);

}

void loop()

{

  analogVal=analogRead(tempPin);

  voltage = (analogVal/1024.0)*5.0;

  temperature = 100*voltage-50;     

  Serial.println(temperature);

  delay(200);       

  if (temperature>30.0)

  {

   digitalWrite (led,?);

   digitalWrite (buzzer,?);

   delay (100);

  }

    else

    digitalWrite(led,LOW);

    digitalWrite(buzzer,LOW);

    delay (100);                      

}