MIDI value for pots 'stuck'

Testing/Troubleshooting
1

Greetings,

I am constructing the MIDIBox plus. So far everything

has run smoothly until I connected the last components, the pots.. Everything displays correctly (trigger buttons for example) except the value of the pots displayed on the little bar graphs.. they are currently stuck half way and when I turn the a pot maximum it goes full, but turning it down, the value seems to go down to 3/4 of the way then stops… I checked the voltage across the pots and it goes from 0 to ~4.6 volts…

Any ideas what could be wrong?

Regards,

Rob

2

Actually on closer inspection I see the MIDI value is either 91 or 127 (nothing in between) when turning a pot… Could I have damaged the A/D converter in the pic??

3

Problem solved-

I used Dave Wheeler’s PCB layout… There was a track

missing which was mean to connect pin 5 of the PIV to 5v… This should probably be fixed and updated on the download site.. (as well as grounding the floating inputs on the 74HC00… )

4

Thanks for the input, I’ve added a comment in the README.1st, this was the fastest solution.

Best Regards, Thorsten.