OK so I have mastered dimming a 240v 100w light bulb using a vellman dimmer unit as previously mentioned in this thread, but I now want to take the project a little further.
I want to be able to control several spot bulbs (each between 50w-200w) using the Arduino, each spot bulb is in a different tank and will be dimmed based on temperature readings on an individual basis.
I was thinking of creating a unit that has several temperature sensors reading the temperature from each of the tanks and controlling the dimming based on the reading. Buying mulitple vellman boards is an option, but I would make the unit extremely large.
Lets say the maximum number of bulbs I wish to control is 4 so i would have 4 sensors attached to the arduino is the best way to create the 4 dimming circuits required to use Opticouplers and Triacs ?