This project is the teensy code for Will Yager's custom mechanical keyboard project. (blog post)
The code serves two functions:
- If plugged into USB, the device will act as a stand-alone keyboard with 33 keys. ("The master")
- If a second device is plugged into that first device, the two devices will share relevant information over I2C. In this way, two of these devices can be connected to form a 66-key keyboard. With some modification to the firmware and the I2C pull-up resistors, one could theoretically chain up to 129 boards together (I believe).
- Install
avr-gcc. - Install Teensy loader.
cd srcmake- Drag
main.hexinto Teensy loader. - Program Teensy.
- Modify
keys[]inKeyMapper.cpp. - Replace values like
KEY_Awith other values fromkeylayouts.h.
This should be fairly simple to figure out. Within the file, I have keys[]
laid out just like the physical keys.
Start USB/I2C
Determine master/slave status
forever:
led_status
=> get hardware state from HardwareController
=> debounce buttons with ButtonDebouncer
=> detect changes in buttons with ButtonDeltaDetector
=> map button changes to key changes with KeyMapper
=: key_changes
led_status
=> update the slave (if it exists) with the SlaveNotifier
=: slave_key_changes
key_changes, slave_key_changes
=> notify the master (over USB or I2C) of key changes with the MasterNotifier
=: led_status
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