Quote:
Originally Posted by Daox
Still doing a little refining on the circuit. I added a pull down resistor as I had some issues with my SSR activating when it shouldn't. I also added a supression diode in case you're actually using a relay versus SSR. Here is the updated schematic.
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This looks great. Good that you are addressing both SSR and electro-mechanical relays, as they each have their own advantages, no arcing and longer life for the SSR, higher efficiency and lower cost for the electro-mechanical.
I was looking at your 'attic heat' thread, and it looks like you have the code working.
Will you be posting the source code for your differential controller here?
I am asking because there is a modified form of the differential controller, such as you have here that incorporates change/time. This type is used for controlling radiant slabs. With this type of controller, indoor temperature is monitored as well as outdoor, and when a change in outdoor temp exceeds a certain rate of change, the heat to the slab is increased or decreased, thus minimizing the 'time-lag' that usually accompanies a thermal mass. So, in a way it is a PID controller.
Am I explaining this in a clear way?
Regards,
-AC_Hacker