Ardt1 hardware/software doc

pin assignments:
d0 rx (from host tx) - hard drive 5v high is stop
d1 tx (to host) 5v open collector, 115200 baud
d2 water out rate counter pin
d3 ?
d4 indoor DHT 22
d5 water inlet counter
d6 outdoor DHT 22
d7 basement DHT 22
d8 ?
d9 onboard led
d10 spi /CS
d11 ? maybe available but normally spi out and spi is used
d12 spi data from thermocouple
d13 spi clock

a0 - water overflow
a1,2,3, lower levels
a4 water inlet valve drive, high opens valve
a5 water outlet valve drive, high opens valve

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Commands for unit 1 (#,cmd byte, <lf> - 3 bytes per command
1a<lf> - print ack <cr><lf> (default arduino line termination)
1c<lv> - close all valves
1d<lf> - open dump valve
1i<lf> - open inlet valve
1l<lf> - turn on led
1o<lf> - turn led off
1r<lf> - report
(Gallons, incounts, outcounts, indoorf, outdoorf, basementf, indoorRH, outdoorRH, basement RH,
TcCJ, thermoF, inletvalve, outletvalve) - actually tab separated, ending in <cr><lf>
1!<lf> - software reset
