At regular intervals throughout the day, the ESP8266 polls the ATtiny13 to pull the stored sensor pulses and voltage measurement. ... (known from some power meter solutions).

If you’ve ever put your finger on an ESP8266 module when it’s really working, you’ll know what went wrong here: the ESP8266 heated up the board and gave a high reading on the temperature sensor.

Thanks to our technology editor, and keen cyclist, Steve Bush for flagging this one: a project to build a bike power meter. Basically, is an early prototype of a low-cost affordable fitness power ...