No Idea Steve. My head was blown apart trying to figure this one and the guy on the arduino forum told me to try that circuit. I did not try driving the PNP directly from the arduino and my protoboard is now built, installed and running. Would be interesting to see without the 2n2222 in there.
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View my Aquarium & Reef Controller build here:
The Ultimate DIY Aquarium Controller of the 21st Century!!!
LED's, PH, Salinity, Clock, LCD, ATO, Auto Water Changer, Variable Speed Cooling Fan Control and lots, lots more......
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