DIY USB-HID With a Twist of Lime

Make a custom USB-HID keypad in the shape of a citrus fruit. This keypad features six mechanical switches for controlling media players like Spotify, iTunes, YouTube, etc. Powered by the Adafruit QT Py RP2040 and CircuitPython.

Inside the case is a NeoPixel Jewel that slowly fades in and out making the keypad illuminate. The QT Py and NeoPixel are housed in a 3D printed case with parts that snap fit together.  

Lemon, Lime and Fruits

The case and key caps can be 3D printed in different colors. Choose a color scheme that best matches your preferred flavor of fruit. Could it be an orange, a lemon, a lime or maybe a watermelon? You decide!

Kailh Mechanical Key Switches

Click, click, click... Mechanical key switches offer a tactile feeling and there's a few varieties of switch type. Choose the type that best suits your preference.

Custom Keys

One of the goals of this project was to create a unique layout for a keypad. Originally conceived as a circular keypad, the enclosure evidently turned into a fruit inspired shape. As a result, the key caps are cute little triangular pieces.

Prerequisite Guides

Take a moment to walk through the following guides:

Parts

List of parts required for this build:

What a cutie pie! Or is it... a QT Py? This diminutive dev board comes with one of our new favorite chip, the RP2040. It's been made famous in the new
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Be the belle of the ball with the NeoPixel Jewel!  We fit seven of our tiny 5050 (5mm x 5mm) smart RGB LEDs onto a beautiful, round PCB with mounting holes and a...
$5.95
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For crafting your very own custom keyboard, these Kailh mechanical key switches are deeee-luxe!Come in a pack of 10 switches, plenty to make a...
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Silicone-sheathing wire is super-flexible and soft, and its also strong! Able to handle up to 200°C and up to 600V, it will do when PVC covered wire wimps out. We like this wire...
$4.95
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Keep your electronics from going barefoot, give them little rubber feet! These small sticky bumpers are our favorite accessory for any electronic kit or device. They are sticky, but...
$0.95
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1 x Heat Shrink
Pre-Cut Multi-Colored Heat Shrink Pack Kit
1 x Solder Wire
60/40 Rosin Core - 0.5mm/0.02" diameter - 50 grams
1 x Adjustable 60W Pen-Style Soldering Iron
120VAC USA Plug - BEST 102C
1 x Helping Third Hand
Magnifier W/Magnifying Glass Tool - MZ101

This guide was first published on Apr 26, 2021. It was last updated on 2021-04-26 14:14:10 -0400.

This page (Overview) was last updated on Dec 01, 2021.

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