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Hey Brach, Sorry it took me a few days to get back to this. I’ve inspected everything closely and I’ve used my multimeter to test. The only time pin is being shorted to ground that I can see is when the tap switch is pressed. Oddly, I seem to be able to get the pedal to work consistently by holding to tap switch down at power up. I’m stumped. Any ideas?
Edit: Scratch the part about it working consistently when holding down the tap switch at power up. That seemed to work for a bit, but was apparently just a fluke.
Thanks for the explanation of the LED sequence. This makes sense because I did also notice tempo anomalies once or twice where the rate changed abruptly. Now that I know where to focus my attention I will check everything thoroughly. Pin 4 is measuring about 1.8 mV by the way.
Almost there, but I’m still chasing a ghost. I’m still getting the blinking 1-2 off 1-2-3-4 off 1-2 off pattern on the tempo LED intermittently at power up. I can power it on and off repeatedly without touching the pedal and about half the time it does this and nothing else. The other times it works perfectly. I can’t find anything shorting out anywhere. Could I have a flaky microcontroller? Any help would be greatly appreciated.
I think I’ve found my own issue. I replaced the stock pots with alpha pots with dust caps believing this would be enough to insulate them from the board. I just slipped some thin rigid strips of plastic between them and the LEDs are functioning properly. On to calibration and testing!