Thursday, February 04, 2016

First prototype of Heating and Air-conditioning system with remote temperature sensor

When using the Heating and Air-conditioning system in the house, the control unit is located in the master bedroom, and controls the temperature there. When I work in the office, the temperature is not well maintained.
I need to have a remote temperature sensor in the office, controlling the Heating/AC system.
I decided to solve this with two ESP8266 NodeMCUs and Visuino.
Here is the first experimental working prototype:

Control unit:

And Remote sensor:

Next I plan to replace the sensor with DHT22, improve the UI, and package the whole thing together in boxes.
The second power regulator on the first picture is now removed. I used it for quick test before I adjusted the voltage from the adjustable buck AC/DC regulator on the top.
I will post more pictures and the Visuino project when I get it all working to my satisfaction ;-) .


Icculus said...


EndoMan said...

Great technology Boian. The office temperature will be perfect. But you know your wife in the bedroom is going to complain the bedroom temperature is not good for her! ;-)



Boian Mitov said...

Thank you! :-)
Actually we tend to stay in the same room with my Wife during the day, but I am already thinking about implementing VAV (Variable Air Valve) version in the future, and control the vents with servos :-D

Jan Penninkhof said...

Very nice. You may want to add a 10kOhm pull-up or pull-down resistor to the output pins, to give the pin a state when your ESP boots up. Without it, the pin floats and your relay may very quickly switch on and off, which could damage your aircon unit. Good luck!

Boian Mitov said...

Thank you Jan Penninkhof!
I may do that. If I recalled in the testing it was not causing such problem so far.
This is also the first draft. I am working on more improvements.