Joey Castillo

The-Open-Book.

Sensor-Watch. A board replacement for the classic Casio F-91W wristwatch

libros. WIP: the new Open Book firmware

second-movement. Work-in-progress update to Movement, the community firmware for Sensor Watch

babel. unicode for microcontrollers

circuitpyui. a simple displayio gui framework for circuitpython

Adafruit-GFX-Library. Multilingual fork of the Adafruit GFX graphics core library, this is the 'core' class that all our other graphics libraries derive from

twitter-archive-site. Python code to parse a Twitter archive and output to a Hugo static site

gossamer. A lightweight framework for building low-power firmware on Microchip's SAM D and SAM L series of microcontrollers

sensorwatch.net. HTML

Sensor-Watch-Documentation. JavaScript

pycorder. C

Feather-Projects.

voteforthedemocrat. Seriously, how difficult is this?

libros-convert. TODO

second-movement-builder. Online firmware builder for Second Movement

OSO_CircuitPython_LCD. CircuitPython driver for LCD FeatherWing

uf2-samdx1. MSC bootloader (based on UF2) for SAMD21

Sensor-Cap. C

LCD-FeatherWing. KiCad design files for the LCD FeatherWing

PyPen. A pen that runs CircuitPython, pretty self-explanatory

thebigboard.cc. HTML

ArduinoCore-samd11. C

circuitpython. CircuitPython - a Python implementation for teaching coding with microcontrollers

Teardown-2025-Talk.

oddlyspecific.org. C++

OSO_Arduino_LCD. Arduino driver for LCD FeatherWing

Sensor-Watch-ChirpyRX. This is a browser-based app to receive and decode data transmissions beeped out by faces like the activity_face or chirpy_demo_face on Joey Castillo's Sensor Watch.

lotusdocs. 📖 A free, lightweight, modern documentation theme for Hugo [WIP]

OpenBookReader. Cocoa Touch testbed for Open Book pagination

arduino-esp32. Arduino core for the ESP32

Vectorscope-Touch.

GxEPD2. Arduino Display Library for SPI E-Paper Displays