HardLabs

POSpad

str-dst·POSpad·pcb/pos.kicad_pcb

POSpad PCB layout, top view — open source AVR/Arduino board by str-dst

About the POSpad PCB

POSpad is an open source AVR/Arduino PCB design by str-dst, published on GitHub under the CC-BY-NC-4.0 license. It is a 2-layer board measuring 37.1 × 40.9 mm, with 26 components from 15 distinct parts.

Its main chip is the ATmega32U2-AU, from the AVR/Arduino family. Other key parts include the SRV05-4. By type, the board carries 12 resistors, 4 capacitors, 2 ICs, 1 transistor, 1 crystal and 1 fuse.

It belongs with the keyboards designs in this gallery.

From the project

2x2 POS key compatible macropad

- In-switch backlight LEDs - Powered by an Atmega32u2 - Basic ESD and overvoltage protection - Centered USB type-C port for a detachable cable - Fully programmable using QMK and Vial

POSpad, from the project README
From the project README

Main components on the POSpad

ATmega32U2-AUSRV05-4

POSpad bill of materials (BOM)

26 components, 15 distinct parts.

QtyPartRefs
1
ATmega32U2-AU
U1
1
SRV05-4
U2
1
AO3401A
Q1
1
Crystal_GND24_Small
X1
1
Polyfuse_Small
F1
4
MX-LED
MX1, MX2, MX3, MX4
1
USB_C_Receptacle_USB2.0
USB1
1
10uF
C1
2
22pF
C4, C5
1
1uF
C6
2
5.1k
R1, R2
2
22
R3, R4
3
10k
R5, R6, R8
1
100r
R7
4
1k
R9, R10, R11, R12

POSpad design files

The KiCad project lives in the str-dst/POSpad repository on GitHub; these links point at the commit this page was built from.

POSpad: common questions

What microcontroller does the POSpad use?

The POSpad is built around the ATmega32U2-AU, from the AVR/Arduino family.

How big is the POSpad PCB?

The POSpad measures 37.1 × 40.9 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the POSpad?

26 components, from 15 distinct parts. The full bill of materials is listed on this page.

Where can I download the POSpad design files?

From the str-dst/POSpad repository on GitHub, which has the KiCad layout and the schematic; the links under Design files point to each one.

Can I use the POSpad design in my own project?

It is published under CC-BY-NC-4.0, which limits how it may be reused; read the license before building on it.

Can I test firmware for the POSpad 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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