it must look like he’s a wizard — able to conjure up home electronics out of solder smoke and some plywood. Of course, we know better. Inside his gadget is a simple temperature sensor ...

What the CORE, and now the updated CORE2 body temp sensor, does is provide an easy way for both professional and non-professional riders to understand what their heat acclimation looks like.

As cheap as the WCH CH32V003 MCU is, its approximately $0.10 price tag looks far ... Plot of the temperature measurement using the improvised CH32V003 -based temperature sensor.