https://fletcher.cool • This is a web feed, also known as an Atom feed. Subscribe by copying the URL from the address bar into your newsreader. Visit About Feeds to learn more and get started. It's free. Visit website Recent posts Updated on $DATE date USB-PD fletcher.cool - USB-PD Embedded systems engineer: firmware, hardware, and reverse engineering. Zola2026-10-16T00:00:00+00:00https://fletcher.cool/tags/usb-pd/atom.xml Reverse-engineering a $30 USB power meter, and writing it a new brain 2026-09-21T00:00:00+00:00 2026-10-16T00:00:00+00:00 Fletcher https://fletcher.cool/blog/tc66-custom-firmware/ How I went from "why won't this meter do what I want over USB" to a from-scratch replacement firmware that triggers USB-PD, QuickCharge, and Samsung AFC on command.