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  • Project TELEGRAPH (Part 3): Bare Metal, Bit-Banging, and the 4MB Heist

    calendar Mar 27, 2026 · 13 min read · arm reverse_engineering electronics telegraph  ·
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    Project TELEGRAPH (Part 3): Bare Metal, Bit-Banging, and the 4MB Heist

    With our custom ESP32 wireless flasher built and tested in Part 2, we finally severed the USB cord. Now it was time to actually run some code on the clock's STM32F105RB.


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Kamil Wcisło

Distributed computing, cloud and embedded systems enthusiast
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Recent Posts

  • Siphon: Building a Zero-Trust Edge Gateway for Home Assistant
  • Project TELEGRAPH (Part 3): Bare Metal, Bit-Banging, and the 4MB Heist
  • Project TELEGRAPH (Part 2): Escaping the Cables with a Custom ESP32 Wireless Flasher
  • Project TELEGRAPH (Part 1): Rescuing a $15 LED Matrix from Software Purgatory
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Series

TELEGRAPH 3

Tags

ELECTRONICS 3 REVERSE_ENGINEERING 3 TELEGRAPH 3 MEKOPS 2 ARCHITECTURE 1 ARM 1 ETL 1 HOME_ASSISTANT 1 IOT 1 PHILOSOPHY 1 SIPHON 1 WIRELESS 1
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