The collector is controlled very simply – the temperature measured by the collector and the water heating tank (boiler). When the water temperature in the solar collector is higher than boiler, controller turns on the pump and the heat transfer from the collector to hot water storage begins. When the temperature difference decreases, the circulation pump is turned off. Controller described here, works as follows:

When the temperature difference between the solar collector and the tank more than 5 degrees, the switch is turned on. Temperture is measured and displayed on the screen constantly, but the difference is checked every 15 seconds.
When the temperature difference between the solar collector and the tank is less than 2 degrees, the relay is switched off. Difference checked every 15 seundžių.
Potentiometer can ask any number from 0 to 100, it rodomasekrane. When the 3-ber sensor temperature reaches the limit switches 2nd relay. Temperature falls below the limit switch turns off.
Instead of the two sensors (solder the two resistors or cut the track plate) can connect another 2-channel relay module and the necessary sensors connected sequentially on a single cable. For the controller to work after such changes require minimal improvements to the program.
DS18B20 sensors can be connected 2 or 3 wires.
The display shows the boiler temperature, collector temperature, temperature difference, 3-ber temperature sensor, potentiometer preset temperature, relay status.

Step 1:

Had 12 PCB, all handed out. <br>Clock is very necessary for solar collector controller. I plan to improve the scheme and do more. <br>Links corected.
Very Nice, is a circuit board available ? None of the links seem to work properly.

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