Quadrature optical interrupt pinout

[mhay]

Hello all.

I've been trying to interface this optical interrupt that I have salvaged from a printer

I've checked the pins on diode test across the bottom two pins (at the sensor not the plug) where I expect the diode to be and don't get anything. I have a few of the same printer and I've got the same result for all.
Testing it powered up there's ~1.5v across where I think the diode is and 3.2V on the direction outputs. I've marked the 3V and 0V from this.
Wiring it up to my sketch I get nothing. I have tried to see the IR diode with my phone camera also.
I've proved the sketch with this photo interrupt .

It has the same pins on the sensor but 4 cables instead of 6 as the 0V and 3V are combined on the board with current limiting resistor and cap.

I will upload the sketch when I find it again.

Any thoughts why the diode doesn't show up when tested or the possible pinouts?

Thanks

[gilshultz]

There is nothing there to work with, just pictures of green and brown circuit boards with black blobs and wires. Consider reverse engineering the sensor and generating a schematic, by then it should become obvious. You can purchase them for less then a buck and get all the information and a lot less greaf. A lot more information is needed such as component part numbers, assembly part numbers and who made it?

[mhay]

Hi all.

Follow up for anyone in the same position.

I couldn't get the diode to show up with diode test function, my camera or in my test sketch with suspected pinouts

I have quite a few of these I'd like to use so I really wanted to figure this out.

In a last ditch effort I checked it in pitch black and caught a red glow.
I tested the pins of one that was turned on and found the polarity and voltages.

The pin outs are the same as most other 6 pin optical interrupters except its 1.5V at the IR diode:

After checking a few datasheets I've put an 100ohm @ 1.5V for the diode and everything is working now!

Sketch I've been using to test the encoder below
Encoder test

#define encoderDT 2 
#define encoderCLK 3 // Interrupt
#define encoderSW 4

int previousDT;
int previousCLK;
int previousSW;

void setup()
{
Serial.begin(9600);
pinMode(encoderDT, INPUT_PULLUP);
pinMode(encoderCLK, INPUT_PULLUP);
pinMode(encoderSW, INPUT_PULLUP);
attachInterrupt(digitalPinToInterrupt(encoderCLK), doEncoder, CHANGE);
previousDT = digitalRead(encoderDT);
previousCLK = digitalRead(encoderCLK);
previousSW = digitalRead(encoderSW);
}

int encoderPos = 0;
int previousEncoderPos = 0;

void loop()
{
int actualSW = digitalRead(encoderSW); // Without debouncing

if (actualSW != previousSW)
{
Serial.print("SW= ");
Serial.println(actualSW);
previousSW = actualSW;
}

if(encoderPos > previousEncoderPos)
{
Serial.print(actualSW);
Serial.print(" ");
Serial.print(encoderPos);
Serial.println(" CW");
}

if(encoderPos < previousEncoderPos)
{
Serial.print(actualSW);
Serial.print(" ");
Serial.print(encoderPos);
Serial.println(" CCW");
}

previousEncoderPos = encoderPos;

// delay(1000);
delay(40);
}

void doEncoder()
{
int actualCLK = digitalRead(encoderCLK);
int actualEncoderDT = digitalRead(encoderDT);

if ((actualCLK == 1) and (previousCLK == 0))
{
if (actualEncoderDT == 1)
encoderPos--;
else
encoderPos++;
}

if ((actualCLK == 0) and (previousCLK == 1))
{
if (actualEncoderDT == 1)
encoderPos++;
else
encoderPos--;
}

previousCLK = actualCLK;
}