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Forum: Tools

11-24-19, 12:01 AM

Replies: 16

Need help with Nest-HRV integration

Views: 25,510

Posted By bbro62

My apologies for not updating this thread or...

My apologies for not updating this thread or responding. I did get this working but at the same time, was starting my own business which consumed most of my time. I'm happy to report that my...

Forum: Tools

03-14-16, 01:27 PM

Replies: 16

Need help with Nest-HRV integration

Views: 25,510

Posted By bbro62

update

This project has been moving forward (or backward) in fits and starts so I thought I'd post an update.

I got a cheap logic analyzer and did some sniffing of the commands being transmitted and...

Forum: Tools

01-26-16, 05:39 PM

Replies: 16

Need help with Nest-HRV integration

Views: 25,510

Posted By bbro62

Got sidetracked for a few days but wanted to...

Got sidetracked for a few days but wanted to thank you again for this incredible information. The only logic analyzers I could find for under $50 were generic Saleae knock offs but they supposedly...

Forum: Tools

01-21-16, 08:55 AM

Replies: 16

Need help with Nest-HRV integration

Views: 25,510

Posted By bbro62

Thanks! This is exactly the information I was...

Thanks! This is exactly the information I was looking for. Do you have any thoughts about using an Arduino itself as a logic analyzer such as what is demonstrated here:...

Forum: Tools

01-20-16, 10:51 PM

Replies: 16

Need help with Nest-HRV integration

Views: 25,510

Posted By bbro62

I don't know about 2-way communication but I do...

I don't know about 2-way communication but I do think it is more like a glorified (and pretty ugly) keypad. From what I can tell, the wall controller is a transmitter and the control board on the HRV...

Forum: Tools

01-20-16, 10:25 PM

Replies: 16

Need help with Nest-HRV integration

Views: 25,510

Posted By bbro62

Early on I thought the black and green wires were...

Early on I thought the black and green wires were the key to a solution. A jumper between the two terminals does initiate a high speed fresh air exchange and jumpering with a 3.9K resistor does...

Forum: Tools

01-20-16, 07:14 PM

Replies: 16

Need help with Nest-HRV integration

Views: 25,510

Posted By bbro62

Agreed. I have pretty much memorized those pages....

Agreed. I have pretty much memorized those pages. And also pages 13 and 14 that give a nice walk through of the control logic. What they don't show is that the control relays are on a printed circuit...

Forum: Tools

01-20-16, 06:31 PM

Replies: 16

Need help with Nest-HRV integration

Views: 25,510

Posted By bbro62

Thanks for your reply. The HRV unit is long out...

Thanks for your reply. The HRV unit is long out of warranty so I'm not too worried about that. But you are right, the manufacturer has not responded to any of my queries as expected. Other than the...

Forum: Tools

01-18-16, 12:05 PM

Replies: 16

Need help with Nest-HRV integration

Views: 25,510

Posted By bbro62

Need help with Nest-HRV integration

Can anyone point me to information about how to replicate the signal logic of an HRV wall controller with a microcontroller?

I have a Carrier HRV which works well but I've never liked the...

Forum: Introductions

01-18-16, 11:34 AM

Replies: 1

Montana newbie

Views: 2,910

Posted By bbro62

Montana newbie

I came across this forum trying to find information about HRV controllers. I've been interested in alternative energy and efficiency since I was a kid during the oil embargo in the 70s. I'm also a...

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