Programming bluetooth to pass data between your phone and Raspberry Pi can be quite challenging and painful. Instead, I designed an NFC HAT to pass small chunks of data between your Phone and Raspberry Pi.
I have a small number of these available if you are interested to play around with for $29 on my personal shop here:
The design is open source and KiCAD schematic and layout files can be accessed here:
https://github.com/ubopod/ubo-pcb/tree/main/KiCad/ubo-nfc-hat
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