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ranging

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An Arduino library for the Reyax RYUW122 UWB module. It simplifies AT command communication for precise distance measurement (ranging), indoor positioning, and data transmission. Supports Tag/Anchor modes on ESP32, ESP8266, STM32, RP2040, and Arduino.

  • Updated Jan 30, 2026
  • C++

Getting FiRa UWB ranging to work between a Samsung phone (Exynos U100) and an iLabs Challenger RP2040 UWB (DW3000) board — the whole point of the project. Full DS-TWR frame exchange works; STS key agreement is blocked by Samsung's undocumented, vendor-gated derivation. Everything we ruled out, with evidence.

  • Updated Aug 19, 2026
  • C++

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