Granola beacon

michaelswitzer·granola-beacon·PCB/granola-frontier.kicad_pcb

About the Granola beacon PCB

Granola beacon is an open source RP2040/RP2350 PCB design by michaelswitzer, published on GitHub under the CC-BY-NC-4.0 license. It is a 2-layer board measuring 211 × 128.8 mm, with 79 components from 21 distinct parts.

Its main chip is the RP2040, from the RP2040/RP2350 family. Other key parts include the AMS1117-3.3_SOT223, USBLC6-2SC6, W25Q128JVS, 74HC4051 and DRV5053. By type, the board carries 38 capacitors, 25 ICs, 6 resistors, 3 inductors, 2 connectors and 1 crystal.

From the project

Granola Beacon: arcade controller with hall effect switches

The Beacon is a button box style arcade controller by Granola Arcade. It is designed to use magnetic "hall effect" switches for increased precision.

The .step files for the case is optimized for FDM 3D printers. I recommend PLA with at least 15% infill but you can use any material you wish.

The design for the acrylic top is also included, which you can get fabricated or print a replacement on a 3D printer.

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

Main components on the Granola beacon

AMS1117-3.3_SOT223 USBLC6-2SC6 RP2040 W25Q128JVS 74HC4051 DRV5053

Granola beacon bill of materials (BOM)

79 components, 21 distinct parts — part numbers from the project's BOM.

Qty	Part	Footprint	Refs
1	AMS1117-3.3_SOT223	SOT-223-3_TabPin2	U1
1	USBLC6-2SC6	SOT-23-6	U2
1	RP2040	RP2040-QFN-56	U3
1	W25Q128JVS	SOIC-8_5.23x5.23mm_P1.27mm	U4
3	74HC4051	SOIC-16_3.9x9.9mm_P1.27mm	U5, U6, U7
18	DRV5053	SOT-23	U9, U10, U11, U12, U13, U14, U15, U16 +10
1	ABLS-12.000MHZ-B4-T	Crystal_SMD_3225-4Pin_3.2x2.5mm	Y1
2	AUDIOJACK3 AudioJack3	Jack_3.5mm_PJ320D_Horizontal	J1, J2
1	TS-1187A-B-A-B	SW_Push_1P1T_XKB_TS-1187A	SW1
1	HE_Switch	HE_Switch	UP2
1	HRO-TYPE-C-31-M-12	HRO-TYPE-C-31-M-12-Assembly	USB1
1	C42591 USB_A	USB-A-SMD_C42591	USB2
3	HE_Switch	HE_Switch	L1, L2, L3
3	10U 10u	C_0805_2012Metric	C1, C2, C3
31	100N 100n	C_0402_1005Metric	C4, C5, C6, C7, C8, C9, C10, C11 +23
2	1u	C_0402_1005Metric	C13, C14
2	27P 27p	C_0402_1005Metric	C16, C17
2	5.1k	R_0402_1005Metric	R1, R2
1	HE_Switch	HE_Switch	R3
1	27	C_0402_1005Metric	R4

Show 1 more

Qty	Part	Footprint	Refs
2	1k	C_0402_1005Metric	R5, R6

Granola beacon design files

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

Granola beacon: common questions

What microcontroller does the Granola beacon use?

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

How big is the Granola beacon PCB?

The Granola beacon measures 211 × 128.8 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the Granola beacon?

79 components, from 21 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 beacon design files?

From the michaelswitzer/granola-beacon 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 beacon design in my own project?

It is published under CC-BY-NC-4.0, which limits how it may be reused; read the license before building on it.

Can I test firmware for the Granola beacon 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.