Comments for Marc's Blog http://mgdengineering.com/blog Projects, Ideas & Comments by Marc Daigneault Tue, 07 Sep 2010 02:58:51 +0000 http://wordpress.org/?v=2.7.1 hourly 1 Comment on HVAC Project by Jeff http://mgdengineering.com/blog/?p=4&cpage=1#comment-6 Jeff Wed, 20 May 2009 13:40:36 +0000 http://mgdengineering.com/blog/?p=4#comment-6 Hey Marc, 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. Cheers, Jeff Hey Marc,

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.

Cheers,
Jeff

]]> Comment on HVAC Project by Marc http://mgdengineering.com/blog/?p=4&cpage=1#comment-5 Marc Wed, 20 May 2009 01:44:33 +0000 http://mgdengineering.com/blog/?p=4#comment-5 Oleg, 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. Marc Oleg,

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.

Marc

]]> Comment on HVAC Project by Oleg Mazurov http://mgdengineering.com/blog/?p=4&cpage=1#comment-4 Oleg Mazurov Wed, 20 May 2009 01:21:38 +0000 http://mgdengineering.com/blog/?p=4#comment-4 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? 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?

]]> Comment on HVAC Project by Marc http://mgdengineering.com/blog/?p=4&cpage=1#comment-3 Marc Tue, 19 May 2009 04:50:29 +0000 http://mgdengineering.com/blog/?p=4#comment-3 Thanks Jason! 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! Marc Btw, how did you find out about my project? Thanks Jason!
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!
Marc

Btw, how did you find out about my project?

]]> Comment on HVAC Project by jason http://mgdengineering.com/blog/?p=4&cpage=1#comment-2 jason Mon, 18 May 2009 00:16:41 +0000 http://mgdengineering.com/blog/?p=4#comment-2 Great project. Looking forward to schematics, and parts list, ect............. Great project. Looking forward to schematics, and parts list, ect………….

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