I have just unpacked and played with my new Leonardo board and I think it's fantastic. I've been fiddling with programming and things, but never with Arduino, Leonardo in my case.
I purchased a kit containing mostly what I needed, but I'm still waiting for a few more parts to be delivered.
I'd like to build a water chiller using peltier/TEC devices. I want to use two TECs each 15.4V @ 10A which is 154W MAX. Two of them is over 300W. I don't need to run it all the time, but only enough according to liquid's temperature. Say the liquid's temperature range is 0-100°C and TECs max voltage is 15.4V or max current is 10A.
When writing code, which data should I use to control TEC's usage (Volts or Amps)? I'd like to use PWM signal for this. Something like: if liquid temp is 0°C then use 0% of TEC's power. If it's 50°C use 50% of power etc.
With regards to MOSFETS, what is the best way to do this? Do I connect a PWM pin to MOSFET's Gate pin? Also what MOSFET in terms of Volts and Amps should I get for thse 154W TECs? If I understand it correctly I would need two MOSFETs output current capaable of 10A at 15.4V?
I would appreciate all advises!
Thanks in advance!
Ok, I've managed to get this done. Now I need to implement the idea to Peltiers.
I don't use many parts, but I believe some diodes etc could be added for safety.