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Step 3Calibration
Photocells differ so you need to calibrate yours to your laser. Run the following sketch from Login258 or use the one on the arduino website at http://arduino.cc/en/Tutorial/Calibration
void setup() {
pinMode(4, OUTPUT);
Serial.begin(9600);
}
void loop(){
digitalWrite(4, HIGH);
Serial.println(analogRead(0));
}
With the sketch running press Serial Monitor on the arduino window and make a note of the numbers that appear in the bottom of the window with the laser on the photocell and when it is off (ambient light).
void setup() {
pinMode(4, OUTPUT);
Serial.begin(9600);
}
void loop(){
digitalWrite(4, HIGH);
Serial.println(analogRead(0));
}
With the sketch running press Serial Monitor on the arduino window and make a note of the numbers that appear in the bottom of the window with the laser on the photocell and when it is off (ambient light).
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