Agvelli's blog

The last step is to draw numbers and arrows near the buttons. I used kitchen molds and a black permanent marker. I know, the number 2 is not aligned...

To safely power off the footswitch board, I thought to add a shutdown command, pressing both Down and Up footswitches. To avoid filesystem corruption due to power outage I set boot partition as "write protected" and disabled swap file and swap partition (unneeded writes).

To complete the build, I added 6 little feet under the board. I used cheap end cap of shutters as short feet. For taller feet I added wine bottle plastic caos (I'm trying to keep low the bill of material).

The next step is to mount Raspberry, connect gpio pins and solder +5v connection to each button. The first picture shows +5v wiring. I know, I know, the 5v wires are of a different color, but I recycled some wires that I already had. The second picture shows gpio inputs wiring.

I ordered 10 buttons from AliExpress While waiting the delivery of the item, I built a cardboard model of the footswitch and did some test on the placement of the buttons. I had to choose between a button placement on the same line and a button placement on multiple lines. The first option allows easier button selection, but requires a very long pedal board. the first option allows easier button selection, but requires a very long pedal board (longer than 80cm). The second option is more compact (less than 60cm) but requires more attention to select the preset. I chose the latter. I found a 6mm Thick MDF board on sale at a DIY store. This Is the first prototype: 4 presets per row bank down / up on the bottom right