Thank you for sharing this nice project.
I made according to the instructions on this site the two minimum nodes, one with relay and one with DS1820 temperature sensor because I didn’t have a DHT at hand and it works very well.
But, for me personally, it would be good to be able to command two relays with two different temperature sensors. That’s because my house setting consists of a boiler and two pumps that supply the ground floor and first floor using two simple wireless thermostats.
In the current situation I have to have two “smart-thermostats”, two old Android devices and two separate apps on my phone.
Any suggestion ? Thank you.