HardLabs

MacroKeyboard

joshajohnson·CBRhardware·CSides/Keyboard/MacroKeyboard.kicad_pcb

MacroKeyboard PCB layout, top view — open source AVR/Arduino board by joshajohnson

About the MacroKeyboard PCB

MacroKeyboard is an open source AVR/Arduino PCB design by joshajohnson, published on GitHub. It is a 2-layer board measuring 89 × 100 mm, with 73 components from 20 distinct parts.

Its main chip is the MCP23017_SS, from the AVR/Arduino family. Other key parts include the AMS1117-3.3. By type, the board carries 29 diodes, 16 relays, 11 resistors, 9 capacitors, 3 connectors and 2 ICs.

From the project

A monthly hardware meetup for anyone interested in electronics / hardware.

This talk will cover the process of designing, manufacturing, and assembling electronic hardware, with a focus on how to use KiCad to design and layout a PCB. Using a keyboard Josh designed as an example, aspects of the process such as circuit design, PCB layout and assembly, along with programming and mechanical design will be demonstrated, with the goal of providing an overview of the process for anyone interested in designing their own hardware.

Main components on the MacroKeyboard

AMS1117-3.3MCP23017_SS

MacroKeyboard bill of materials (BOM)

73 components, 20 distinct parts — part numbers from the project's BOM.

QtyPartRefs
1
AMS1117-3.3
TPD2S017
U1
1
MCP23017_SS
ATMEGA32U4
U2
1
16MHz
Y1
1
USB_B_Micro
J1
1
AVR-ISP-6
J2
1
WS2812B Strip
J3
1
500mA
F1
16
KEYSW
K1, K2, K3, K4, K6, K7, K8, K9 +8
1
SW_Push
SW1
2
LED
D1, D9
11
WS2812B
D2, D3, D4, D10, D16, D22, D23, D29 +3
16
D
D5, D6, D7, D8, D11, D12, D13, D14 +8
1
10U
100n
C1
1
22U
22p
C2
1
100N
22p
C3
2
1u
C4, C5
4
100n
C6, C7, C8, C9
2
220R
1K
R1, R12
7
220R
10K
R2, R5, R6, R7, R8, R13, R14
2
220R
22R
R3, R4

MacroKeyboard design files

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

MacroKeyboard: common questions

What microcontroller does the MacroKeyboard use?

The MacroKeyboard is built around the MCP23017_SS, from the AVR/Arduino family.

How big is the MacroKeyboard PCB?

The MacroKeyboard measures 89 × 100 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the MacroKeyboard?

73 components, from 20 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 MacroKeyboard design files?

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

Can I use the MacroKeyboard design in my own project?

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

Can I test firmware for the MacroKeyboard 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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