This is an alternative OpenHaystack firmware based on https://github.com/seemoo-lab/openhaystack/tree/main/Firmware/Microbit_v1/offline-finding but using the Softdevice from Nordic Semi. This way it will use a lot less power than the original one. It seems that a CR2032 may last almost 3 years! seemoo-lab/openhaystack#57 (comment)
git submodule init
git submodule update
-
nRF command line tools
brew tap homebrew/cask-drivers; brew install --cask nordic-nrf-command-line-tools -
binutils
brew install binutils -
gcc-arm-none-eabi
brew install --cask gcc-arm-embedded
Follow instructions on the apps folder