I see a lot of conflicting documentation on how many
GND pins are available on model B rev. 2.0. I have hardware revision "000e" and there are a lot of
DNC (Do Not Connect) pins.
http://pi4j.com/pins/model-b-rev2.html says there is 1. http://raspberrypi.znix.com/hipidocs/topic_gpiopins.htm says there are 5.
Which one to trust?
Ideally I want more than one ground pin as I currently have a problem when I detect digital pulses almost simultaneously on multiple pins (I have connected four electrical meters which gives out one pulse per Watt used) - it seems there can be interference, meaning I am detecting ghost pulses. So I want to split my electrical meters in to each seperate
GND instead of the common one on pin 6.