QT Py Media Knob using rotary encoder & neopixel ring

Related tags

Deep Learning usb circuitpython mousewheel knob usb-hid
Overview

QTPy-Knob

QT Py USB Media Knob using rotary encoder & neopixel ring

The QTPy-Knob features:

  • Media knob for volume up/down/mute with "qtpy-knob.py" CircuitPython program
  • Stylish design reminiscent of Griffin Powermate
  • Recessed USB-C connector to for safety
  • No screws needed for assembly
  • Only 3 wires needed to solder (none if you want to forgo LED lighting)
  • Reprogrammable for any USB macro key action via CircuitPython

A small video about it: https://www.youtube.com/watch?v=pt7JgoSlgOg

This is an attempt to make a minimal and easy-to-build version of similar, previous projects like:

Components

Parts needed:

Software

Software installation consists of:

  • Install CircuitPython on the QT Py
  • Install required CircuitPython libraries to QT Py
  • Copy qtpy_knob.py to QT Py

The CircuitPython installation step is described here: https://learn.adafruit.com/welcome-to-circuitpython/installing-circuitpython

The last two steps can be accomplished with the below

git clone https://github.com/todbot/qtpy-knob
cd qtpy-knob
pip3 install circup
circup install -r requirements.txt
cp qtpy_knob.py /Volumes/CIRCUITPY/code.py

Variations

There are a few variations of the code provided:

  • qtpy_knob_scroller.py -- performs scrolling instead of volume knob
  • qtpy_knob_simple.py -- no neopixel stuff, just encoder and USB sending
  • qtpy_knob_midi_cc.py -- sends MIDI CC instead of keyboard/mouse

Assembly

Steps:

  1. Plug rotary encoder to bottom of QT Py. If your encoder has metal on the bottom, add a bit of tape (Kapton, Scotch, electrical) in between the QT Py and the encoder. If your encoder has mounting tabs, cut them off. Solder the five pins.

  1. Print out the enclosure on your 3d printer. Standard 0.2mm at 20% infill is fine. The STL files are:
  • qtpyknob-base.stl -- Base that houses the QT Py & rotary encoder
  • qtpyknob-basecap.stl -- Cap that goes on the bottom of the base
  • qtpyknob-knob.stl -- Knob that you turn
  • qtpyknob-diffuser.stl -- Light diffuser that goes between base & knob, should be printed with translucent or clear plastic. Or you can leave it out. Or you can approxiate it with a disk cut out clear plastic like a CD case

Use the rotary encoder's washer & screw to hold QTPy+encoder assembly

  1. Solder three wires to the Neopixel ring, insert the ring into the enclosure and solder the wires to the 3V, Gnd, and MI pins of the QT Py. Use a bit of hot glue to secure the Neopixel ring if it doesn't snap in.

  1. Snap the bottom cap on and the knob top on and you're done with physical assembly!

Wiring diagram

Assembly animation

Useful links

Resources that helped me out on this:

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Comments
  • Renaming to avoid

    Renaming to avoid "-" and use "_".

    Thank you for this piece of code and great idea.

    Just a suggestion to avoid "-" into python file name and user "_" instead.

    This permit to never rename the original file from the project and have a code.py like this:

    import qtpy_knob_simple
#import qtpy_knob_scroller
#import qtpy_knob

    PS: I have both QT-Py and Seeduino XIAO in the same form factor... my QT-Py is more precious because it has reset button, Stemma-QT pin, RGB. So I wanted to rename the pin for XIAO use... but there is no need, your code works out of the box on the same physical pin with the same code. Only the through hole seems smaller on the XIAO so it does not fit perfectly flush. Did I mention it does also kind of work without soldering!!!

    opened by dglaude 5
  • minor issues around encoder fit

    minor issues around encoder fit

    Noticed a couple of things when using the specified Bourns PEC11-4215F-S24 encoder:

    1. The diffuser ring is too thick for the lock nut to fasten. It's 2 mm thick, and there's exactly 2 mm of thread left on the encoder.
    2. The D-shaft cutout in the top is too deep to allow the encoder shaft switch to trigger.

    Otherwise, it's a fantastic project and very easy to make. Yes, I used a Seeeduino XIAO, too

    Workarounds

    I made the central part of the diffuser thinner so the lock nut would fasten. Excuse the OpenSCAD, it's all I know:

    bbox = [ 49.988811, 49.994404, 2.000000 ];
minima = [ -25.000000, -24.997202, 2.700000 ];

difference() {
    translate([-bbox.x/2, -bbox.y/2, 0])translate(-minima)import("qtpyknob-diffuser.stl");
    translate([0,0,0.8])cylinder(d=bbox.x/2, h=bbox.z);
}

    For the D-shaft cutout, a blob of Blu Tack of just the right size mostly fixes the issue.

    opened by scruss 4
Owner
Tod E. Kurt
multi geek, runs @thingm, maker of blink(1) USB LED & BlinkM, co-founder @CrashSpaceLA hackerspace. http://blink1.thingm.com
Tod E. Kurt
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