I want to be able to time the period (typically greater than 10mS) that an input is ON.
Stage 1 - Specifically I want to determine the pulse rate in mS or seconds from the led on the front of a electrical power consumption utility meter which typically flashed once for each Watt/Hour of consumption & then display the value on the serial monitor. Needs to be interupt driven.
Stage 2 would then use something like 433MHz radio link modules to send the data to a host display controller where it displays the instantaneously power consumption at any time.
Stage 3 - Data logging to SD card
Anyone done similar before?