LetterBox

Source

Status

Shelved. My business idea covers the need I had for this, and though the business is currently back-burnered, I do have the prototypes… I’ll leave this up for the history of it, though, at least for now.

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Summary

Staying informed can be tricky. It’s easy for notifications to be too intrusive, or not visible enough. The LetterBox is an attempt to solve that simplistically with little more than a box full of letters.

Well, that and some wireless magic…

Photos

Project Log

LetterBox: First Efforts With ESP32

April 16, 2023
Hardware
It’s been a fairly unfocused week, but I’ve somehow managed to allocate an hour here or there to letterbox. My goal has been to validate my current design choices: the use of shift registers to drive the display, fed by an …

Detour!

April 16, 2023
Hardware
As I was working on the preliminary letterbox design, I noticed a fairly severe oversight. All of my experiments were based on a single display module, which an ESP8266 or ESP32 can handle easily using our chosen algorithm.

Calculating i2c Pull-up Resistor Values

April 13, 2023
Hardware
The common i2c bus (or TWI, or whatever non-trademarked name your manufacturer is using) is fairly easy to design with. It’s just a couple of wires, right? Well, mostly… You also need a pair of pull-up resistors.
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