Driver pods.

I am planing a heliostat driver system.

each "pod" will have 2 motors to control.

the reflection will fall onto 4 light sensors (2 for each motor).

I am thinking http://www.solarbotics.com/products/50646/resources/ for the motor controler and 2 of http://www.futurlec.com/cgi-bin/search/qty_price.cgi?part_no=ATTINY26L-8PU for the brains.

I am thinking I need 4 analog inputs. (2 leds,current sensor,potion sensor.) and 2 digital outputs for the directional control.

I want to connect (up to 8 pods, ~6m between each one) pods to a main driver that will calculate the sun position and take over each pod in turn to put in an approximately correct position (the Ardunio)

what systems can I use to communicate over the distance?

i am also thinking the Ardunio will transmit an ID of 1 to the 1st pod which transmits a 2 to the 2nd pod(etc)

what systems can I use to communicate over the distance

I would look at using DMX to talk to your pods.

ld look at using DMX to talk to your pods.

http://en.wikipedia.org/wiki/DMX512 ?