If you expect the signal to swing between 0 and +5V then set the trigger level to somewhere around 2.5V.
As with input coupling the trigger coupling can usually be set to either AC or DC. Perhaps...
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Re: Scanning encoder debounce on new scope
I also found the MAX6818 debouncer, but it's $4.37 for 8-bit at JLCPCB.
Demon Today, 00:07More like master of none. :wink: