We used that SparkFun HX711 board to read strain gauges in a project hooked up to an arduino tiny. Probably work with a blue pill, but that's not quite as tiny.
I have always thought that it would be best to have a bridge of 4 strain gauges at 45 degrees to the long axis of the crank, but I never actually tried it. IIRC, the chip data sheet shows how to hook it up to a full bridge
He can always leave a visitors message on your profile without getting to 10 posts.
I suggest searching for "PAS electric bike torque sensor for bottom bracket"
There are a lot of people that have posted online about DIY power meters. At least they aren't all starting companies like they used to do.
Last edited by unterhausen; 02-19-23 at 08:09 AM.