Embedded on Juan Chonghttp://juanjchong.com/tags/embedded/Recent content in Embedded on Juan ChongHugoenSun, 09 Aug 2026 00:00:00 +0000Motion Sensing on the DEF CON 34 Badgehttp://juanjchong.com/posts/dc34-badge-motion-sensing/Sun, 09 Aug 2026 00:00:00 +0000http://juanjchong.com/posts/dc34-badge-motion-sensing/The DC34 badge has a LIS2DH12 accelerometer in it, and the stock firmware gives it two jobs: wake the screen when you pick the badge up, rotate it when you turn it over. The sensor runs continuously and everything else it measures gets thrown away. This project uses that same sensor to work out what the person wearing the badge is doing. Walking, standing, sitting, or not being worn at all.