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First pcb keypad

clavinohou·first-pcb-keypad

First pcb keypad layout, top view — open source AVR/Arduino board by clavinohou

About the First pcb keypad

First pcb keypad is an open source AVR/Arduino PCB design by clavinohou, published on GitHub. It is a 2-layer board measuring 140.5 × 19.1 mm, with 24 components from 12 distinct parts.

Its main chip is the ATmega32U4-A, from the AVR/Arduino family. By type, the board carries 7 capacitors, 4 LEDs, 4 diodes, 4 resistors, 1 IC and 1 crystal.

From the project

ooh ah how exciting cant wait

Its basically an Arduino Pro Micro just put in the form factor that I wanted. It features 4 MX style contacts for your switches to sit on. There is also a pinout for a rotary encoder for volume adjustment. In the final design I plan to just solder wires to the rotary encoder since the knob I want wont be able to sit right next to the switches. I will make a branch with the code that I eventually use, as well as another branch for the .stl I eventually create, but for now I'm just making sure the circut board actually works.

First pcb keypad, from the project README
From the project README

Main components on the First pcb keypad

ATmega32U4-A

First pcb keypad bill of materials (BOM)

24 components, 12 distinct parts.

QtyPartRefs
1
ATmega32U4-A
U1
1
16mhz
Y1
1
500mA
F1
1
SW_Push
SW1
1
Molex-0548190589
USB1
4
MX-NoLED
MX1, MX2, MX3, MX4
4
D_Small
D1, D2, D3, D4
4
0.1uF
C1, C2, C3, C6
2
22pF
C4, C5
1
1uF
C7
2
22
R1, R2
2
10k
R3, R4

First pcb keypad design files

The KiCad project lives in the clavinohou/first-pcb-keypad repository on GitHub; these links point at the commit this page was built from.

First pcb keypad: common questions

What microcontroller does the First pcb keypad use?

The First pcb keypad is built around the ATmega32U4-A, from the AVR/Arduino family.

How big is the First pcb keypad?

The First pcb keypad measures 140.5 × 19.1 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the First pcb keypad?

24 components, from 12 distinct parts. The full bill of materials is listed on this page.

Where can I download the First pcb keypad design files?

From the clavinohou/first-pcb-keypad repository on GitHub, which has the KiCad layout and the schematic; the links under Design files point to each one.

Can I use the First pcb keypad design in my own project?

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

Can I test firmware for the First pcb keypad 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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