[AD2] Emulating a Relative/Incremental-Encoder -- How to setup open-collector/drain

[blipton]

I'm developing a Stepper Motor application, and would like to simulate the output of a relative encoder, which looks like a series of square pulses as the motor rotates, 63 to be exact (one tooth is missing).   

My board is providing a 5V pullup to the encoder output, so I assume I would need to use 'WaveGen' configured as an Open-Collector,  set the frequency (~1hz), and set it to do a set number of pulses then stop, but I'm not finding these options.   Am I looking in the wrong place or should be using a different function (pattern, script)?

 

Edited August 10, 2021 by blipton

[attila]

Hi @blipton

The Digital IOs can be used as OC/OD but on Analog Discovery the 0/3.3V protection circuit could draw significant current and the 5V signal may drop.
The Wavegen outputs have no high impedance option but you could simulate (generate) 0/5V signals with these.
Or you could use DIOs with external level shifter.