Tractor-mounted crop spraying controller

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anyone know any pictures of information on what this is? its for a college project :o

i need to know the input and output devices of it
 
Depends how complex you want to go.Can have gps controlled application rates on cutting edge machines afaik ,full rate where a known problem exists ,less as a general cover.Easiest way to do it is varying machine forward speed,but i expect newer machine can vary it by the nozzles. Sorry i'm vague - its years since i've had anything to do with that type of stuff

some gizmos here http://www.lh-agro.co.uk/Products.htm
 
Christ! they certainly have got advanced since i was doing this sort of thing in college, i was amazed by a tractor equiped with a GPS speed sensor used to measure slip when plowing among other things!
 
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