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85 lines
2.3 KiB
C++
85 lines
2.3 KiB
C++
/*
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Arduino Starter Kit example
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Project 3 - Love-O-Meter
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This sketch is written to accompany Project 3 in the
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Arduino Starter Kit
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Parts required:
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1 TMP36 temperature sensor
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3 red LEDs
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3 220 ohm resistors
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Created 13 September 2012
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by Scott Fitzgerald
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http://arduino.cc/starterKit
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This example code is part of the public domain
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*/
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// named constant for the pin the sensor is connected to
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const int sensorPin = A0;
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// room temperature in Celcius
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const float baselineTemp = 20.0;
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void setup(){
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// open a serial connection to display values
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Serial.begin(9600);
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// set the LED pins as outputs
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// the for() loop saves some extra coding
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for(int pinNumber = 2; pinNumber<5; pinNumber++){
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pinMode(pinNumber,OUTPUT);
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digitalWrite(pinNumber, LOW);
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}
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}
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void loop(){
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// read the value on AnalogIn pin 0
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// and store it in a variable
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int sensorVal = analogRead(sensorPin);
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// send the 10-bit sensor value out the serial port
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Serial.print("sensor Value: ");
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Serial.print(sensorVal);
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// convert the ADC reading to voltage
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float voltage = (sensorVal/1024.0) * 5.0;
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// Send the voltage level out the Serial port
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Serial.print(", Volts: ");
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Serial.print(voltage);
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// convert the voltage to temperature in degrees C
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// the sensor changes 10 mV per degree
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// the datasheet says there's a 500 mV offset
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// ((volatge - 500mV) times 100)
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Serial.print(", degrees C: ");
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float temperature = (voltage - .5) * 100;
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Serial.println(temperature);
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// if the current temperature is lower than the baseline
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// turn off all LEDs
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if(temperature < baselineTemp){
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digitalWrite(2, LOW);
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digitalWrite(3, LOW);
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digitalWrite(4, LOW);
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} // if the temperature rises 2-4 degrees, turn an LED on
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else if(temperature >= baselineTemp+2 && temperature < baselineTemp+4){
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digitalWrite(2, HIGH);
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digitalWrite(3, LOW);
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digitalWrite(4, LOW);
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} // if the temperature rises 4-6 degrees, turn a second LED on
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else if(temperature >= baselineTemp+4 && temperature < baselineTemp+6){
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digitalWrite(2, HIGH);
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digitalWrite(3, HIGH);
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digitalWrite(4, LOW);
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} // if the temperature rises more than 6 degrees, turn all LEDs on
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else if(temperature >= baselineTemp+6){
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digitalWrite(2, HIGH);
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digitalWrite(3, HIGH);
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digitalWrite(4, HIGH);
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}
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delay(1);
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}
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