Here’s an only slightly more invasive usage where a washing machine’s “end of cycle” LED was removed and the power going to it was rerouted to an Arduino for remote monitoring.
The ODT-PVT-ULP-001C-22FDX is an ultra-low power temperature, voltage and process monitor designed in a 22nm CMOS process. This IP operates over the entire temperature range of -40 C to 150 C. The ...