HardLabs

Numpad

str-dst·numpad

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

About the Numpad PCB

Numpad 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 99.3 × 115.8 mm, with 60 components from 15 distinct parts.

Its main chip is the ATmega328-PU, from the AVR/Arduino family. By type, the board carries 23 diodes, 21 LEDs, 6 resistors, 5 capacitors, 1 IC and 1 fuse.

From the project

simple numpad

This work is licensed under a [Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International License][cc-by-nc-sa].

[cc-by-nc-sa]: http://creativecommons.org/licenses/by-nc-sa/4.0/ [cc-by-nc-sa-image]: https://licensebuttons.net/l/by-nc-sa/4.0/88x31.png [cc-by-nc-sa-shield]: https://img.shields.io/badge/License-CC%20BY--NC--SA%204.0-lightgrey.svg

Numpad, from the project README
From the project README

Main components on the Numpad

ATmega328-PU

Numpad bill of materials (BOM)

60 components, 15 distinct parts.

QtyPartRefs
1
ATmega328-PU
MCU1
1
Polyfuse
F1
1
AVR-ISP-6
ISP1
1
USB_C_Receptacle_USB2.0
USB1
1
Crystal
XTAL1
18
MX-NoLED
MX1, MX2, MX3, MX4, MX5, MX6, MX7, MX8 +10
3
MX-NoLED
MX15, MX19, MX21
2
3.6V
D1, D2
21
D_Small
D3, D4, D5, D6, D7, D8, D9, D10 +13
1
4.7u
C1
2
100n
C2, C3
2
22p
C4, C5
2
68R
R1, R2
2
1.5K
R3, R6
2
5.1K
R4, R5

Numpad design files

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

Numpad: common questions

What microcontroller does the Numpad use?

The Numpad is built around the ATmega328-PU, from the AVR/Arduino family.

How big is the Numpad PCB?

The Numpad measures 99.3 × 115.8 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the Numpad?

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

Where can I download the Numpad design files?

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

Can I use the Numpad 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 Numpad 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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