I'm using the nRF51822-EK (PCA10001) and I'm going to develop a bluetooth cadence (and speed) sensor for MTBs. I desire low power consumption and i though to put the nRF in "system off mode" during inactivity time. The nRF51822 woke up by an analog signal (sensed by LPCOMP) whenever the bicycle's wheel perform an entire revolution. So, I must measure time between two consecutive wheel's revolution. It's possible to have a timer active during the "system off mode" ?
Thank you all!!!