denisj:
This pulse sensor must read a LED pulse of my current power meter
and then send it via RF every 5 minutes to another arduino base.
I know of one type of meter that sends a data packet every 1.0 seconds. If I only had to send data every 5 minutes then I would get a packet, send my data and sleep until just less than 5 minutes -- enough to let the board get up to speed to read the next packet.