The paint has dried in my prototype board, and I have put the main pieces into place.
Ormston's notes on the pin assignments are shown below:
D00 - (N/A)
D01 - (N/A)
D02 - Flow Sensor (indoor)
D03 - Flow Sensor (outdoor)
D04 - Call For Heat (+5V)
D05 - Compressor ON
D06 - Pump ON (indoor)
D07 - Pump ON (outdoor)
D08 - (N/A)
D09 - (N/A)
D10 - (N/A)
D11 - (N/A)
D12 - (N/A)
D13 - LED
A00 - Thermistor (evaporator temperature)
A01 - Thermistor (condenser temperature)
A02 - (N/A)
A03 - (N/A)
A04 - (N/A)
A05 - (N/A)
So I connected the hardware together, per Ormston's pin descriptions.
I'm using SSR's for now just because they have screw-down wire terminals for inputs and out puts, so no flat cable fabrication is required.
SSR Relays are connected to the Uno outputs as below:
- SSR4 - (N/A)
- SSR3 - D7 (outdoor pump)
- SSR2 - D6 (indoor pump)
- SSR1 - D5 (compressor)
I don't yet have the thermistors hooked up, no pumps hooked up, no flow sensors hooked up.
But I did hook up power and observed the controller's behavior.
Upon power up, the LEDs of the SSR that were driven by Uno digital output pins D7 (outdoot pump) and D6 (indoor pump), Both began to blink 24 blinks at roughly equal intervals.
After that only the SSR LED connected to D6 (indoor pump) continued to blink for 24 blinks at roughly equal intervals
After that neither SSR LED blinked.
Looks to me that the pattern is to pulse the pumps and to sense with the flow meters if water is flowing.
I'm sure that the other goodness will be apparent one the thermistors and flow meters are hooked up.
Thanks to everyone who has helped... it's starting to come to life!
Best,
-AC