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a small grid 64 clone
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README.md

Overview

small grid 64 clone heavily based on previous work by hugelton/btns.

overview image

Uses a Rasperry Pi Pico Microcontroller, NeoPixel RGB LEDs (SK6812), cheap buttons and a 3d-printed case and button-overlay. Includes hardware and firmware support for an optional tilt-sensor.

Building

It is highly recommended to order the PCB assembled from JLCPCB. That assembly will include everything other than the parts in the BOM.

BOM

Part Quantity Source Required
PCB with components 1 JLCPCB, ordered with Gerber and Assembly files from latest release. Gerber: butns-JLCPCB.zip, BOM: butns_bom_jlc.csv, CPL: butns_cpl_jlc.csv. yes
Raspberry Pi Pico 1 Original Raspberry Pi Pico, or USB-C Variant yes
M2.5x6 Button Head Screws 5 M2.5x6 yes
Case 1 3d-printed (FDM). case.stl contains the top and bottom half. In the image, it is printed in black PLA, 0.2mm layerheight. yes
Button Matrix 1 3d-printed (FDM). Print buttons.stl with white PLA and 0.12mm layerheight and no infill, 2 wall lines, concentric top infill. These should guide the LEDs light well. Optional: Add buttons-black-blockers.stl while importing as a multi-material print and print those in black to block light from neighboring buttons yes (black blockers optional)
Button TPU Case Inlay 1 3d-printed (FDM). Print with TPU, perhaps in black. Will help against rattling of the buttons in the case. no
SMD 2.54" Pin Header 1x8 Type A 1 1x8 Type A no, for tilt
MPU6050 module 1 MPU6050 Module no, for tilt

Assembly

Flash microcontroller with firmware.uf2. Solder MCU and Pin-Header to PCB. Screw everything into the case. Done!