IR Height Sensor with Klipper

[br7408]

I am doing a second build of a similar printer to my first (Duet 3 wifi), running Klipper on a BTT Octopus 1.1 instead. I wanted to use the IR Height sensor on this build as well because it works really well with my heated bed (strong magnets).

I notice on startup, I get 4 pulses (analog) instead of 2 (digital). I do have the pullup signal activated, but I read somewhere about the signal from the board not engaging in time, or similarly needing to add an additional resistor to provide the proper current to activate digital mode.

I cannot find any consistent information anywhere, though. Are there any known fixes for this?

The (seemingly) most feasible solution I have read is from the original IR Sensor website that discusses adding a 470 ohm pulldown resistor from the sensor pin to the ground pin.

[dc42]

@br7408 try adding a pullup resistor of about 10K between the OUT and Vcc pins of the IR sensor. I don't believe that a pulldown resistor will work.

[br7408]

@dc42

Excellent. I actually did more digging around last night and found one of your posts in another forum from many years ago recommending this. I will try it and report back. Your sensor is absolutely the best one out there in my opinion, so I will be happy to get it working on this machine.

UPDATE: That did the trick David. It is now booting in digital mode. Thank you.