To help move air around my house I would like the furnace fan to run at least 10 minutes out of every hour, or maybe more. I also have a heat exchange ventilator that I want to program times for it to run.
Hardware - I want to tie to the GPIO pins:
For the heat exchange ventilator I just need to be able to turn it on and off based on a schedule I pick i.e. on for one hour off for one hour. Therefore I assume some kind of relay could be used. I'll have to check on the current draw, but all there is to is power wise it two fans, one blowing out and one blowing in.
For the furnace fan I need to sense when it turns off and start counting. When the number of minutes I specify elapse without the thermostat turning it on, I want to turn it on with the RasPi for a set number of minutes and then reset.
I have no idea, somebody help me. I would start out with some kind of script running in the background and then move to some kind of web interface. If there is a home automation package out there that would do this then I would be open to trying it.