The HVAC Writeup is complete and now posted in the projects section. Feel free to discuss/ask about it here. I read all your responses and will reply to your questions! Leave you email if you’d like.
HVACMonitor: Web-Enabled Thermostat
Great project. Looking forward to schematics, and parts list, ect………….
I’ve updated with the EagleCAD files, take a look!
I’ll be putting the full write-up online soon, along with code & schematics.
Thanks for the interest!
Btw, how did you find out about my project?
Very nice project. I’m thinking of building something similar. I have a question - how difficult would it be to run this off of 24V relay voltage?
Great Question! It was part of the original plan to get this running off the 24Vac system (That’s why there’s an extra screw terminal on the board, just below the R labeled one), however time constraints forced me to let that idea go. A simple diode bridge and a voltage regulator would have this leech power from the HVAC wiring; like all thermostats do. Simply bridging power from the R terminal and the Common of the transformer would work.
All the wiring needed is available. Just a matter of integrating it on the board.
Thanks for bringing it up, It’s going onto the 2nd revision of the board, along with merging both boards into 1 design.
Sweet project. I was just thinking about using something like this for my house. Instead of remote monitoring and control, I would use it to add some automatic heating control. It would interface to a weather website and get the predicted weather and determine if the heat should be turned on.
I thought of this when I got out of the shower and noticed the heat was on. It was probably 50-60 degrees out at that time, and it is supposed to get into the mid 70’s today. So in a couple hours, the outside temp would be greater than inside and it was probably inefficient for the heat to be on at that time.
I guess a programable thermostat could also work, but that idea would be alittle smarter.