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CMX K Six key

jstwy·CMX_K_Six-key·CMX_K_Six-Key.PCBDesignFiles/CMX_K_Six-Key.kicad_pcb

CMX K Six key PCB layout, top view — open source AVR/Arduino board by jstwy

About the CMX K Six key PCB

CMX K Six key is an open source AVR/Arduino PCB design by jstwy, published on GitHub. It is a 2-layer board measuring 56.9 × 37.9 mm, with 28 components from 12 distinct parts.

Its main chip is the ATMEGA32U4, from the AVR/Arduino family. By type, the board carries 8 capacitors, 6 relays, 6 diodes, 4 resistors, 1 IC and 1 crystal.

From the project

Personal Project #1

Although the datasheet for the microcontroller indicates that the part used in this project, the ATMEGA32U4RC-AU, comes with a USB bootloader pre-programmed (see page 422 of the datasheet), my microcontroller did not come with one. For that reason, I had to solder wires onto the SPI signal pins and the reset pin in order to program the microcontroller with an Arduino UNO set up as an in-system programmer.

Main components on the CMX K Six key

ATMEGA32U4

CMX K Six key bill of materials (BOM)

28 components, 12 distinct parts — part numbers from the project's BOM.

QtyPartRefs
1
ATMEGA32U4
U1
1
XTAL_GND
X1
1
USB_mini_micro_B
J1
6
KEYSW
K1, K2, K3, K4, K5, K6
1
SW_PUSH
SW1
6
D
D1, D2, D3, D4, D5, D6
1
1u
C1
4
0.1u
C2, C3, C4, C5
1
4.7u
C6
2
22p
C7, C8
2
22
R1, R2
2
10k
R3, R4

CMX K Six key design files

The KiCad project lives in the jstwy/CMX_K_Six-key repository on GitHub; these links point at the commit this page was built from.

CMX K Six key: common questions

What microcontroller does the CMX K Six key use?

The CMX K Six key is built around the ATMEGA32U4, from the AVR/Arduino family.

How big is the CMX K Six key PCB?

The CMX K Six key measures 56.9 × 37.9 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the CMX K Six key?

28 components, from 12 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 CMX K Six key design files?

From the jstwy/CMX_K_Six-key repository on GitHub, which has the KiCad layout and the BOM; the links under Design files point to each one.

Can I use the CMX K Six key design in my own project?

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

Can I test firmware for the CMX K Six key 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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