I am planing to create some simple climate control automation for sun room. I have bought arduiono clone, together with data log shield, number of sensors and relays from nueletronics.http://www.nuelectronics.com/estore/index.php?main_page=index&cPath=7&zenid=2d914d1482bdca4c30be6616be86d9fd
Everything works fine. I was able to run all samples, verified work for each particular sensor etc., do not have problems with programming, but I cannot find workaround for following statement: Analog lines 2,3,4 and 5 (aka digital lines 16-19) are brought to BOTH P6-P9 and to P1/P2.
So it means - if I have two double relays from nulelectronics attached to P1,P2, then I have only two pins left (P4,P5) for sensors. Or vice versa-I would able to have 4 sensors, but only one set of relays attached to P1 or
P2. But intend is to control temperature, humidity, amount of light and commutate heater, fan, pump,lamp.
I did test - attached buzzer to one of these pins, and it is buzzing when relay is on . Setting buzzer mode to input, switches off also relay. It confirms what is said-e.g. relay and buzzer worked like one device.
Tried to find some info here. Looks like, I am using wrong keywords.
Could you confirm this significant restriction and suggest workarounds?