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Andrew Higgins Writing
Andrew Higgins

Writing

Notes

Notes on hardware, firmware, and the things that only show up once something is deployed and nobody is watching it.

  1. Project Atlas

    The Schematic Is Not the Board

    A four-layer STM32 control board for a Formula SAE car: the stackup, three different ways to switch a rail, and a debug feature that killed the 12 V supply.

  2. Beehive Digital Solutions

    The Page Is the Editor

    Decap CMS hands a client a form. A florist does not want a form. She wants to click the words on her website and change them.

  3. Outlier Node

    Seven Days of Data

    A sensor meant to run for six months stopped logging after one week, and never said so.

  4. Wireless ECG

    Cutting the Ground Wire

    An ECG has four electrodes and only three of them measure anything. The fourth is why the other three work, and it is the one that makes a wireless ECG hard.

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