Creating a prototype

Hi there,

I was wondering if someone is able to tell me how to make a main controller which links to several hundreds of heat detection sensors on the lowest budget cost? Ultimately what i want the sensors to do if it detects certain temperature to do something e.g. turn power off? turn irrigation system on? turn sprinklers on? or if the main switchboard on a hot day reaches certain temperature, to turn off main switchboard before it short circuits.etc…

Seeed Studio in China may be able to help you out: