Arduino control of polarization switcher

Here is the code that I used in the Arduino box to control the polarization rotator (switcher). (I think...)

	// polarization rotator experiment
	int incomingByte = 1; // for incoming serial data
	int pwmPin = 9; // white wire
	int dirPin = 11; // green wire
	int statusLED = 13;
	int delaymsec = 100;
	void setup() {
	Serial.begin(9600); // opens serial port, sets data rate to 9600 bps
	// initialize pwm and dir pins as outputs.
	pinMode(pwmPin, OUTPUT);
	pinMode(dirPin, OUTPUT);
	pinMode(statusLED, OUTPUT); // status LED
	}
	void loop() {
	// check for incoming serial data:
	if (Serial.available() > 0) {
	// read the incoming byte:
	incomingByte = int(Serial.read()) - 48;
	}
	if (incomingByte == 1) {
	//volage-state ON, polarization NOT rotated, status LED ON
	digitalWrite(statusLED,HIGH);
	digitalWrite(pwmPin, HIGH);
	analogWrite(dirPin, 127);
	delay(delaymsec);
	}
	if (incomingByte == 2) {
	//volage-state OFF, polarization IS rotated, status LED OFF
	digitalWrite(statusLED,LOW);
	digitalWrite(pwmPin, LOW);
	analogWrite(dirPin, LOW);
	delay(delaymsec);
	}
	incomingByte = 0; // no new data, skip all updates
	}

view raw polarization_rotator.pde hosted with ❤ by GitHub