Positive Grid Spark Ignitron pedal enclosure

WORK IN PROGRESS!!!

If you own a Positive Grid Spark, you might be missing a properly designed foot pedal to change the presets easily. Obviously, there is the official Spark Control. However, it is designed in a dumb way and forces you to have you mobile phone up & running in order for the Control to work. If your phone dies, you're out of Control… Also, connection reliability issues aren't all that uncommon.

Enter Ignitron, an alternative, open-source Spark foot pedal cleverly designed to be able to mimic both your phone and the amp. Rather than forcing you to use the phone all the time, it enables you to save the presents in the pedal which then pretends to be a fully fledged mobile phone app to the amp. Ultimately, there is no need for the mobile phone once you have everything set up. Kudos for this great project go to stangreg.

This model is an enclosure for the Ignitron hardware housing 6 foot switches, LED indication, display and also UPS power source with option to run either from USB-C or a 18650 Li-Ion battery. It is a bit different from the original shopping list stated on the GitHub project page. It features some cheap AliExpress hardware to save your pocket. Also, it enables you to run out of batteries which the original project didn't support.

Shopping list for this particular build:

• An ESP32 ~ 38PIN
• 1.3" OLED display - I2C 4PIN GND White, both SSD1306 and SH1006 drivers can work
• 6x SPST momentary footswitch
• USB-C socket - USBC 2B
• UPS board with battery holder
• Power switch
• 6x 5mm LEDs
• 6x metal LED mount
• Some screws (4x 2.9x6.5)

Otherwise, refer to the original bill of materials for further guidance.

I printed this in PETG as ASA warps too much with objects of these dimensions. It can still survive some rough handling as the wall diameter is generous (5mm) and there are supports here and there for the lid. There are two STLs with letters that can be printed along lid and screen bezel if you're ready to print multicolor. It can be done even with just a single extruder. This way, you'll have nice colourful footswitch captions ready without any further hassle.

You'll have to print following parts:

• 1x Base
• 1x Lid
• 1x Screen bezel - I suggest printing this upside down with a small layer (I used ~0.10mm) height to save you some post processing time & use supports
• 2x Screen bezel clamp - these are then glued to the bezel mounts and keep the bezel in place
• (Optional) Lid graphics - load along with Lid in multicolor mode of your slicer
• (Option) Bezel graphics - load along with Screen bezel in multicolor mode of your slicer

To glue the bezel clamps, I used an epoxy glue because of it's exceptional strength. Beyond that, the enclosure build is quite straightforward. Just print the parts, mount footswitches and display, mount UPS module and fix it in place with screws. Snap USB-C socket and power switch. Then solder everything & connect the ESP32 which can be snapped onto tiny legs of the lid. Finally, use screws to fix the lid and base together.