Thermostat wiring list

    Arduino Mega 2560
    Standard Arduino Ethernet Shield
    Arduino TX1 -> LCD117 Serial LCD for main display
    Arduino TX2 -> LCD117 Serial LCD for kitchen display
    Arduino TX3 -> LCD117 Serial LCD for bedroom display
    Arduino 2 -> DHT22 main temp/humidity sensor
    Arduino 8 -> DHT22 kitchen temp/humidity sensor
    Arduino 5 -> DHT22 bedroom temp/humidity sensor
    Arduino 6 -> Relay drive main heating control
    Arduino 7 -> Relay drive kitchen heating control
    Arduino 9 -> Relay drive bedroom heating control
    Arduino 22, 24 -> 2 rows from main keypad, cols driven by LCD117 module
    Arduino 26, 28 -> 2 rows from kitchen keypad, cols driven by LCD117 module
    Arduino 30, 32 -> 2 rows from bedroom keypad, cols driven by LCD117 module
    Arduino 42 -> drive for "DNS OK" LED
    Arduino 43 -> "use DHCP" push button
    Arduino 36 -> serial clock to DS1302 clock chip
    Arduino 38 -> input/output to DS1302 clock chip
    Arduino 40 -> chip enable to DS1302 clock chip
    5v to everything that gets 5v
    Ground to everything that gets ground
    raw 9v sent down the cat5 to the remotes where a 7805 regulates to 5v