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** Nightlight LDR test program
** Created 06 Feb 2010
** This example code is in the public domain.
int sensorPin = A0; // select the input pin for the ldr
unsigned int sensorValue = 0; // variable to store the value coming from the ldr
void setup()
pinMode(13, OUTPUT);
//Start Serial port
Serial.begin(9600); // start serial for output - for testing
void loop()
// read the value from the ldr:
sensorValue = analogRead(sensorPin);
if(sensorValue<400) digitalWrite(13, HIGH); // set the LED on
else digitalWrite(13, LOW); // set the LED on
// For DEBUGGING - Print out our data, uncomment the lines below
//Serial.print(sensorValue, DEC); // print the value (0 to 1024)
//Serial.println(""); // print carriage return
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