RPI Pico W + 4067 multiplexer

[shanteacontrols]

RPI Pico W + 4067 multiplexer

[paradajz]

Can you post your entire config file?

[walrusmustgo]

---
  mcu: "rp2040"
  usb: true
  uart:
    dinMIDI:
      pins:
        rx:
          port: "0"
          index: 1
        tx:
          port: "0"
          index: 0
    touchscreen:
      pins:
        rx:
          port: "0"
          index: 5
        tx:
          port: "0"
          index: 4
      components: 64
  i2c:
    display:
      pins:
        sda:
          port: "0"
          index: 16
        scl:
          port: "0"
          index: 17
  buttons:
    type: "native"
    extPullups: false
    pins:
    -
      port: "0"
      index: 2
    -
      port: "0"
      index: 3
    -
      port: "0"
      index: 6
    -
      port: "0"
      index: 7
    -
      port: "0"
      index: 8
    -
      port: "0"
      index: 9
    -
      port: "0"
      index: 10
    -
      port: "0"
      index: 11
    -
      port: "0"
      index: 12
    -
      port: "0"
      index: 13
  analog:
    type: "4067"
    inputVoltage: "3.3"
    multiplexers: 1
    pins:
      s0:
        port: "0"
        index: 18
      s1:
        port: "0"
        index: 19
      s2:
        port: "0"
        index: 20
      s3:
        port: "0"
        index: 21
      z0:
        port: "0"
        index: 26
  leds:
    external:
      type: "native"
      pins:
      -
        port: "0"
        index: 14
      -
        port: "0"
        index: 15
      -
        port: "0"
        index: 22
      -
        port: "0"
        index: 21
      -
        port: "0"
        index: 20
      -
        port: "0"
        index: 19
      -
        port: "0"
        index: 18

Here it is! :)

[paradajz]

You are sharing the pins between LEDs and multiplexers: pins 18, 19, 20 and 21 are defined both for LEDs and multiplexers. Remove the LED ones.

[walrusmustgo]

Oh my........ Thanks! I'm an idiot :)

It's getting better, but there's still some weird stuff happening:

1. If i turn channel 1 knob, i'm getting the correct channel readings ( channel 0 ), but the values are clamped to a really small value ( 27 - 32 ), and if i turn the channel 16 knob, i'm getting both channel 1 and channel 16 readings, with the same clamped values... The pots are 10K by the way, don't know if that matters :)

OpenDeck.configurator.-.Brave.2022-11-08.14-48-40.mp4

[paradajz]

Did you run make clean after you've changed the config file?

[walrusmustgo]

Tried it now, rebuilt, but the problem still persists :(

Do i have to play around with ADC offset by any chance?

[paradajz]

Do i have to play around with ADC offset by any chance?

No. Running the 4067 mux on that same ADC pin on my test setup works fine. My board is standard Pico, though, not the W version, so I'm not sure. Double check your mux wiring, maybe there's a loose contact somewhere.

[walrusmustgo]

Hmm, i'll try to reconnect everything and let you know. :) I'll also see if i can get ahold of a normal Pico board, the Pico W had some small firmware changes afaik, that might cause the issue (although, if i'm not mistaken, it's just some small internal tweaks).

I'll keep you posted once i test with new connections,and a Pico board. :) Thanks a lot!

[paradajz]

You should also tie any unconnected mux pins to GND - floating pins cause noise.

[walrusmustgo]

I've reconnected everything again with new cables, tried a different potentiometer, and connected all of the unused pins to the GND. The only thing that changed was that the clamped value vas lowered ( 25 - 30 )...

I'll try with a regular Pico board tonight, and i'll keep you posted :)

[paradajz]

Please also verify that you are on latest commit on master. After that, to rule out issues with the mux, disconnect Sx and common/signal/Z pins from Pico, tie all Sx pins to GND, and then measure the voltage on the signal pin when the pot on mux channel 0 is turned all the way left and right (so the voltage readouts should be 0V and 3.3V, respectively).

[walrusmustgo]

Alrighty!

1. The commit is latest, just tried cloning the repo again, did a git pull, no changes. Built again, the same issue.
2. I've tried 3 MUX boards with the method you've suggested, all mux boards display correct values (0V - ~3.3V)

I'm more and more starting to believe that it's the Pico W issue to be honest, I've tried building with different pins, some things have definitely changed for the Pico W board:

I'll know more tonight, if it's a Pico W issue, than i'll see if i can pinpoint the problem, and i'll let you know if i've fixed it! And i'll let you know if regular Pico is working correctly :)

By the way, i've changed my config to use 6, 7, 8, 9 ( and removed them from the button control list :) ) pins respectively for the control pins, because looking at the pinout, nothing has changed in that regard on the Pico W.