Granola trailmix

michaelswitzer·granola-trailmix·PCB/granola-trailmix.kicad_pcb

About the Granola trailmix PCB

Granola trailmix is an open source RP2040/RP2350 PCB design by michaelswitzer, published on GitHub under the MIT license. It is a 2-layer board measuring 210.1 × 98.3 mm, with 48 components from 16 distinct parts.

Its main chip is the C2040, from the RP2040/RP2350 family. Other key parts include the C5250992 and C97521. By type, the board carries 18 switches, 17 capacitors, 7 resistors, 3 ICs, 1 crystal and 1 connector.

It belongs with the keyboards designs in this gallery.

From the project

The TrailMix is a low-cost professional grade button box style arcade controller.

The TrailMix is a button box style arcade controller by Granola Arcade. It is designed to provide the minimum cost professional grade arcade stick available. The design of the TrailMix is simplified down to the core, without any of the bells and whistles that add cost and complexity. Win your local without breaking the bank!

You can no longer buy the TrailMix from Granola but you can buy our current controllers at https://granola.games

Granola trailmix, from the project README — From the project README

Main components on the Granola trailmix

C5250992 C97521 C2040

Granola trailmix bill of materials (BOM)

48 components, 16 distinct parts — part numbers from the project's BOM.

Qty	Part	Footprint	Refs
1	C5250992 AMS1117-3.3_SOT223	SOT-223-3_TabPin2	U1
1	C97521 W25Q128JVS	SOIC-8_5.23x5.23mm_P1.27mm	U2
1	C2040 RP2040	RP2040-QFN-56	U3
1	C9002 ABLS-12.000MHZ-B4-T	Crystal_SMD_3225-4Pin_3.2x2.5mm	Y1
1	Conn_01x02	PinHeader_1x02_P2.54mm_Vertical	J1
6	C782807 6mm_Button	SW_PUSH_6mm	SW1, SW2, SW3, SW4, SW5, SW6
12	MX_Switch	SW_Kailh_Choc_V1_1.50u	SW7, SW8, SW9, SW10, SW11, SW12, SW13, SW14 +4
1	C165948 HRO-TYPE-C-31-M-12	HRO-TYPE-C-31-M-12-Assembly	USB1
3	C83061 10u	C_0805_2012Metric	C1, C2, C17
2	C147436 27p	C_0402_1005Metric	C3, C4
10	C115671 100n	C_0402_1005Metric	C5, C6, C7, C9, C11, C12, C13, C14 +2
2	C5137485 1u	C_0402_1005Metric	C8, C10
2	C105637 1k	C_0402_1005Metric	R1, R5
1	DNF	C_0402_1005Metric	R2
2	C2909343 27	C_0402_1005Metric	R3, R4
2	C25905 5.1k	R_0402_1005Metric	R6, R7

Granola trailmix design files

The KiCad project lives in the michaelswitzer/granola-trailmix repository on GitHub; these links point at the commit this page was built from.

Granola trailmix: common questions

What microcontroller does the Granola trailmix use?

The Granola trailmix is built around the C2040, from the RP2040/RP2350 family.

How big is the Granola trailmix PCB?

The Granola trailmix measures 210.1 × 98.3 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the Granola trailmix?

48 components, from 16 distinct parts, with part numbers taken from the project's own BOM. The full bill of materials is listed on this page.

Where can I download the Granola trailmix design files?

From the michaelswitzer/granola-trailmix repository on GitHub, which has the KiCad layout, the schematic and the BOM; the links under Design files point to each one.

Can I use the Granola trailmix design in my own project?

Yes, under the terms of its MIT license, which michaelswitzer chose for the repository.

Can I test firmware for the Granola trailmix without the hardware?

Yes. HardLabs builds a simulation of the board from its netlist and BOM, so you can run and debug RP2040/RP2350 firmware against it before you order a PCB.