Designing a General Purpose Heat Pump Controller

[jeff5may]

I posted info in this thread.
My original intentions were for 3 sketches that could be loaded, for 3 modes of operation:
1: wall thermostat
2: slave outdoor unit device w/ defrost
3: Both #1 and #2

This is in post #140 of the thread.

While I was coding and prototyping, BBP and a few others got involved and began developing their own solutions. I think the rig BBP came up with had a Uno board everywhere there was equipment. Maybe 4 or 5. Somebody else started developing comms, and RS485 was suggested, which added a translator shield. Somebody else did flow sensing with the paddle-wheel counters. I could literally imagine BBP running back and forth between modules with a laptop, applying changes until all the bugs were driven from his rig.

I got the mode 1 board working and asked for help. No one came. So here it is:

Post 275: some trial pics

Github code

Post 298: No visitors to Github, so I posted my code inline.

The thing works off a generic (16Hertz) Uno board, the Dfrobot LCD keypad shield ( post #108), and a 1wire sensor DS18B20. I wired mine to a recycled power board for a portable dehumidifier for the TTL buffer and "sugar cube" relay control. Anybody could rig it through a relay shield like AC originally posted pics of.

I grabbed all the libraries from hacktronics after running into bugs with other source libraries.