I need to sequentially fire 9 heaters arranged in a matrix, each for a set amount of time. I am hoping to use an arduino to control 6 switches (3 for x 3 for y). I would like to use simple triacs to keep cost down after the prototyping stage. Is this possible? What is the simplest way to do this?
Thanks
T
Solid state relays are extremely simple to wire, very reliable and the inputs can be driven directly from an Arduino output. No current limiting resistor is required. Here is one example: http://www.ebay.com/itm/Solid-State-Relay-SSR-25DA-25A-250V-3-32VDC-for-Temperature-Controller-CY-/370958093286?pt=LH_DefaultDomain_0&hash=item565ed34be6
Why complicate it with a matrix? Just use 9 IO pins. Or maybe 3 pins for a shift register and 1 more pin.