arduino vs. some avrlibc solution is one question.
But there are other questions: what will your requirements be - say 2
years from now? still 1 single circuit, or several circuits where the
circuits are part of programmes - as most somewhat sophisticated
commercial irrigation systems offer? (having the facility to program
activation times and periods - using a microprocessor without forseeing
this flexibility of use would appear a poor solution to me) what
hardware arrangement will you use some time from now: a minimum DIL
processor or some mor sophisticated pcb-mounted device? will you support
input for sensing soil humidity? all these things go together.
I think that the precise choice of the type of microcontroller is
secondary. I am using an AT90CAN128 - but this is networked over a CAN
bus (plus a separate PCB for driving 24V AC irrigation circuits via
photorelays - the irrigation system just being part of a discributed
domotics system).
Good luck, Juergen
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