fnew one

Love-o-meter

@@ -0,0 +1,64 @@
+// named constant for the pin the sensor is connected to
+const int sensorPin = A0;
+// room temperature in Celcius
+const float baselineTemp = 20.0;
+
+void setup(){
+  // open a serial connection to display values
+  Serial.begin(9600);
+  // set the LED pins as outputs
+  // the for() loop saves some extra coding
+  for(int pinNumber = 2; pinNumber<5; pinNumber++){
+    pinMode(pinNumber,OUTPUT);
+    digitalWrite(pinNumber, LOW);
+  }
+}
+
+void loop(){
+  // read the value on AnalogIn pin 0 
+  // and store it in a variable
+  int sensorVal = analogRead(sensorPin);
+
+  // send the 10-bit sensor value out the serial port
+  Serial.print("sensor Value: ");
+  Serial.print(sensorVal); 
+
+  // convert the ADC reading to voltage
+  float voltage = (sensorVal/1024.0) * 5.0;
+
+  // Send the voltage level out the Serial port
+  Serial.print(", Volts: ");
+  Serial.print(voltage);
+
+  // convert the voltage to temperature in degrees C
+  // the sensor changes 10 mV per degree
+  // the datasheet says there's a 500 mV offset
+  // ((volatge - 500mV) times 100)
+  Serial.print(", degrees C: "); 
+  float temperature = (voltage - .5) * 100;
+  Serial.println(temperature);
+
+  // if the current temperature is lower than the baseline
+  // turn off all LEDs
+  if(temperature < baselineTemp){
+    digitalWrite(2, LOW);
+    digitalWrite(3, LOW);
+    digitalWrite(4, LOW);
+  } // if the temperature rises 2-4 degrees, turn an LED on 
+  else if(temperature >= baselineTemp+2 && temperature < baselineTemp+4){
+    digitalWrite(2, HIGH);
+    digitalWrite(3, LOW);
+    digitalWrite(4, LOW);
+  } // if the temperature rises 4-6 degrees, turn a second LED on  
+  else if(temperature >= baselineTemp+4 && temperature < baselineTemp+6){
+    digitalWrite(2, HIGH);
+    digitalWrite(3, HIGH);
+    digitalWrite(4, LOW);
+  } // if the temperature rises more than 6 degrees, turn all LEDs on
+  else if(temperature >= baselineTemp+6){
+    digitalWrite(2, HIGH);
+    digitalWrite(3, HIGH);
+    digitalWrite(4, HIGH);
+  }
+  delay(1);
+}