I built my own AirTag-like tracker with this Raspberry Pi alternative - how it works
SMRTR summary
Challenger UWB creates precise DIY tracking using Raspberry Pi Pico 2040 chips, offering accuracy within 10cm. The $65-75 boards run on minimal power (75mA active, 1.5μA sleeping) and include 8MB flash storage, making them ideal for custom tracking projects that work with Apple's U1/U2 chips and FiRa devices, though users need Arduino coding knowledge to implement.
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