Setting up a board for RelayKeys

If you have a pre-prepared Bluetooth stick (for example, from Ace Centre), you don't need to read this section. If you are buying your electronics to use, then read on.

A wide range of Arduino boards supports HID (Human Interface Device). Often these are to emulate simple keypress' but to do more complex things like send one or modifier keys with a key - or to emulate holding a key down for a set period of time is either impossible or difficult to implement. Adafruit has developed the firmware on their Bluefruit nrf* range of boards to emulate HID keyboards well using their AT Commands.

Currently, RelayKeys is designed to work with the Adafruit Feather nRF52840 Express (Buy in the UK from Pimoroni) or with the Adafruit itsybitsy nrf52840 or with lesser support for the The Adafruit - Bluefruit LE Friend - nRF51822 - v3.0 (Buy in the UK from Pimoroni). Although Note: We really aren't supporting the LE Friend much - we do hear it works, but dragons, beware! See below for details on configuring these.

If you are using a receiver dongle - follow the same guidance below but you will also need to copy over the firmware file for the dongle. Same procedure - different file name