• Revision 2

    Clewsy02/11/2021 at 06:11 0 comments

    Here I incorporated some learnings from the intervening years.  Upgrades incorporated into the second (current) revision included:

    • Schematic and PCB layout completely redone but using KiCad instead of Eagle.
    • Microcontroller changed from an AT90usb162 AVR to an ATmega32U4.
    • Remove the serial Tx/Rx connector.
    • Remove the reset tact-switch.
    • Use smd components instead of through-hole.
    • Connect with a USB type C connector instead of a USB type B.
    • Have the PCB fabricated (JLCPCB) instead of the home-made copper-etch method.
    • A couple of LEDs on the bottom of the PCB purely to visualise the gray code (Rev 1 had LEDs but they only barely shone through etched sections of the PCB).
    • Generally improved and cleaner code (still using the LUFA library).

    In action.  The LEDs are a fun way of visualising the gray code.


    Here it is next to another project (macr0).

  • Revision 1

    Clewsy02/11/2021 at 06:07 0 comments

    This was a few years ago but I did record my goals for the initial revision of volcon:

    • The optical encoder parts (sensors and disk) were salvaged from an old track-ball.
    • The "knob" was made from the head drum of a VHS VCR (remember those?). This is the part that spins and is used to adjust volume on my PC.
    • The optical disk was fixed to the shaft and optical sensors mounted off some strip-board and attached to the base of the drum.
    • This assembly is mounted to a custom PCB with some nylon stand-offs. The PCB became the base of the whole unit.
    • I cut some wooden rings to enclose the electronics and the base of the VCR drum.
    • The custom PCB was designed in eagle and etched at home from some single-sided copper-clad board. The circuit was designed around an AVR at90usb162.
    • The code is written in C and implements the LUFA library developed by Dean Camera.
    • The whole unit plugs into a PC via USB and is automatically identified as a HID - no drivers required (tested in Debian Linux and Windows).
    • It's a very simple device - rotate clockwise to increase volume, counter-clockwise to decrease.

    Rev 1 PCB was a home-made etched job.  Some minor bodging required:

    PCB top-side:

    The first revision was pretty ugly: