The photo diode is covered with a cap. That's why I assume that there is no light going through.
The serial output that I receive is the following.
Differance = -6 Servo position = 0 Diode = 69
Differance = 5 Servo position = 1 Diode = 80
Differance = -6 Servo position = 0 Diode = 69
Differance = -6 Servo position = 0 Diode = 69
Differance = -6 Servo position = 0 Diode = 69
Differance = 11 Servo position = 1 Diode = 86
Differance = -6 Servo position = 0 Diode = 69
Differance = -6 Servo position = 0 Diode = 69
Differance = -5 Servo position = 0 Diode = 70
Differance = -5 Servo position = 0 Diode = 70
Differance = -5 Servo position = 0 Diode = 70
Differance = -4 Servo position = 0 Diode = 71
Differance = -4 Servo position = 0 Diode = 71
Differance = -3 Servo position = 0 Diode = 72
Differance = 14 Servo position = 1 Diode = 89
Differance = -3 Servo position = 0 Diode = 72
Differance = -3 Servo position = 0 Diode = 72
Differance = -3 Servo position = 0 Diode = 72
Differance = -2 Servo position = 0 Diode = 73
Differance = -2 Servo position = 0 Diode = 73
Differance = -1 Servo position = 0 Diode = 74
Differance = -1 Servo position = 0 Diode = 74
Differance = 1 Servo position = 1 Diode = 76
Differance = 6 Servo position = 2 Diode = 81
Differance = 7 Servo position = 3 Diode = 82
Differance = 5 Servo position = 4 Diode = 80
Differance = 4 Servo position = 5 Diode = 79
Differance = 5 Servo position = 6 Diode = 80
Differance = 4 Servo position = 7 Diode = 79
Differance = 3 Servo position = 8 Diode = 78
Differance = 8 Servo position = 9 Diode = 83
Differance = 2 Servo position = 10 Diode = 77
Differance = 1 Servo position = 11 Diode = 76
Differance = 1 Servo position = 12 Diode = 76
Differance = 1 Servo position = 13 Diode = 76
Differance = 1 Servo position = 14 Diode = 76
The purpose of this project is to reduce the intensity of a laser with a polarized lens. The lens is connected to a servo motor which allows it to rotate. The photo diode records the intensity of the laser after it passes the lens. It will then compare the actual intensity to the desired intensity and rotates the lens until the desired intensity is reached. The photo diode has 2 wires one which is connected to the analog pin and the other is connected to ground.