The Open Book Project from Joey Castillo is an amazing piece of work, a DIY open source e-book designed so that anyone can solder up their own reader. The project has been with us for some time, and the past version has been based upon a SAMD51 processor commonly found in newer Arduino boards and Adafruit Feather boards. But in a recent tweet, Castillo has unveiled an early render of a version based around the $4 Raspberry Pi Pico.
(Image credit: Joey Castillo)
The first thing to hit you is just how detailed the PCB is for the Open Book Abridged Edition. The silkscreen printing of the PCB tells us about each component, the GPIO pins used on the Raspberry Pi Pico, and more about the project itself.
Featuring a 4.2-inch e-paper display, micro SD card storage, and a built-in battery charging solution, the Open Book Abridged Edition has space at the top of the board for the Raspberry Pi Pico. This space is designed for use with the Pico's castellated edges, enabling it to be soldered directly to the PCB with no need for header pins.
Is this just an e-book reader? Chiefly yes, but the Open Book can be used with external components that use the I2C and STEMMA connector, so it can also be used as a display for sensor-based projects.