I’ve recently decided to monitor my air source heat pump, inspired by the guides here and John’s temperature sensing article.
For now, I’ve bought:
- 1 emonPi
- 6 x temperature sensors
- 1 x breakout box
- 1 x pulse counter
- 50m of 4 pair telephone cable, so that I can extend the length of some of the temperature sensors
I have a rather complicated UFH system with various mixers (which probably shouldn’t be there) and buffer tanks. I think there are actually 12 temperatures I’d like to monitor eventually, but for now I’ll start off with 6.
My question is what are the options to go from 6 to 12 sensors? I understand the RJ45 breakout boards can be connected together, so I could wire up 12 to the one pi, but the firmware of the pi is limited to 6 sensors so it wouldn’t actually work. Is this right?
Is it a good idea to try and modify the firmware? I am a newbie so if this is non-trivial then probably not.
If I have to buy new hardware, what would you suggest? Buying another emonPi and RJ45 breakout board? Or should I be looking at multiple emonTx’s instead of the Pi?
I am asking these questions now because it will influence which 6 sensors I start off monitoring and the cable lengths.