PLEASE HELP! Rotary encoder absolute position

Other Hardware Sensors
1

Hi! I have a problem reading the absolute position of my encoder. Im using the HEDS 5500.
It worked before perfectly but I had to replace my arduino and the code got lost, now I can't manage to figure out how to get it to work again and after searching the whole night I still didn't find any usable code online. All what I found where for incremental readings.

The encoder does 1024 pulses per revolution and I simply want that it starts again to count from 1 when it completed a full turn (counter reached 1024) and other way around to go up to 1024 when the counter reaches 1.

I tried a lot with if conditions but these seem not to work for encoders.
I would be very thankful for any kind of help!

2

How do you know which pulse is pulse 1?

After that it's a simple matter of counting.

3

The HEDS5500 is an incremental encoder, not absolute. The HEDS5540 has an extra index channel that allows you to reset the count at a defined axial orientation.

Datasheet

4

wernj91:
It worked before perfectly...

That's interesting. Did the encoder actually give the absolute position? How did that happen, when power went on on the Arduino?

5

You need HEDS 5540 or 5640 for ABZ encoding - this is still not absolute, you have to spin till you find the
index pulse on the Z channel and then you are zeroed and ready.