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wyri-chorder
SpiffChorder atmega 8 then 16
Bluetooth chorder experiments with arduinos - not widely used
BLE FeatherChorder 2016 Adafruit bluefruit feather
USB FeatherChorder 2025 Adafruit
USB & BLE Wiry Chorder Seeedstudio XIAO nRF52840 still in beta, works solidly, but has a bluetooth issue every few days that seems to be “solved”1) by forgetting the device and re-pairing it on the host. If you are interested in testing this version please write me.
1)
pushed off another few days