HardLabs

Launchpad

martijncasteel·launchpad·pcb/launchpad.kicad_pcb

Launchpad PCB layout, top view — open source AVR/Arduino board by martijncasteel

About the Launchpad PCB

Launchpad is an open source AVR/Arduino PCB design by martijncasteel, published on GitHub. It is a 2-layer board measuring 88.9 × 43.2 mm, with 29 components from 16 distinct parts.

Its main chip is the ATMEGA32U4-MUR, from the AVR/Arduino family. By type, the board carries 9 capacitors, 7 switches, 7 resistors, 2 connectors, 1 IC and 1 crystal.

It belongs with the keyboards designs in this gallery.

From the project

Custom made pcb with accompanying software to flash it

My approach is to use the USB HID protocol in full and specifically the USB HID Telephone pages. The goal is to mute and unmute the microphone on Teams on a laptop, even when teams is not in focus.

This repository contains the entire project, /pcb contains the schematics and design of the board. I used Kicad for this. The gerber files and other nessecities for manufacturing are located in the /assembly folder.

Launchpad, from the project README
From the project README

Main components on the Launchpad

ATMEGA32U4-MUR

Launchpad bill of materials (BOM)

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

QtyPartRefs
1
ATMEGA32U4-MUR
ATmega32U4-MUR
U1
1
CRYSTAL_GND24_SMALL
Crystal_GND24_Small
Y1
1
TYPE-C-31-M-12
J1
1
ICSP
J2
1
500MA
500mA
F1
6
CherryMX
SW0, SW1, SW2, SW3, SW4, SW5
1
CherryMX
SW6
1
C2286
RED
D2
5
0.1UF
0.1uf
C1, C3, C4, C5, C6
1
1UF
1uF
C2
1
10UF
10uF
C7
2
22PF
22pF
C8, C9
2
10K
R1, R4
2
22
R2, R3
1
1K
R5
2
5.1K
R6, R7

Launchpad design files

The KiCad project lives in the martijncasteel/launchpad repository on GitHub; these links point at the commit this page was built from.

Launchpad: common questions

What microcontroller does the Launchpad use?

The Launchpad is built around the ATMEGA32U4-MUR, from the AVR/Arduino family.

How big is the Launchpad PCB?

The Launchpad measures 88.9 × 43.2 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the Launchpad?

29 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 Launchpad design files?

From the martijncasteel/launchpad repository on GitHub, which has the KiCad layout and the BOM; the links under Design files point to each one.

Can I use the Launchpad design in my own project?

The repository has no license, so all rights stay with martijncasteel. Use it as a reference, and ask the author before reusing the design.

Can I test firmware for the Launchpad without the hardware?

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

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