Consider the humble calculator. Now just an app that you always have with you on your telephone, an electronic calculator used to be a technological marvel.

In this project, you'll build your own calculator with an Adafruit Feather RP2040, 128x64 OLED display, and 20 keys. Optional 3D printed parts like an enclosure and even the keycaps themselves make for a sharp presentation. Make it your own by customizing the code, or use the hardware for your own MacroPad-inspired project.

Custom Printed Circuit Board

This project needs a custom PCB. You can pick up the KiCad (design) files or the Gerber (production) files below and upload them to the PCB house of your choice, or you can use this link to order them from OSH Park. You are free to modify the design files and use them in your own designs. (In copyright terms, the design files are licensed as CC0)

OSH Park's standard turnaround is 9 to 12 days from order to shipment, so plan accordingly.

The board files were designed in KiCad, open source software that is free to download & use.

Required Parts

Along with the custom PCB, you'll need basic tools, soldering supplies, and the Adafruit parts listed below.

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A Feather board without ambition is a Feather board without FeatherWings! This is the FeatherWing 128x64 OLED: it adds a gorgeous 128x64 monochrome OLED plus 3...
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Pick up 2 ten-packs of diodes, you need one for each key!
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Get ready to customize your keeb with a 10 pack of two-part plastic keycaps for your next mechanical keyboard or 
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Optional parts

1 x Tapered Heat-Set Inserts for Plastic
Brass, M2.5 x 0.45 mm Thread Size, 3.4 mm Installed Length (Pack of 100)

This guide was first published on Jul 13, 2021. It was last updated on 2021-07-13 16:06:28 -0400.

This page (Overview) was last updated on Oct 08, 2021.

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