I have an application to manage campervan heating; based on circulating engine-cooling fluid, with the engine and auxiliary heater as heat-sources, and various heat-exchangers as heat destinations. The processor must process as follows:
a. The external power supply is a 12V DC car battery.
b. There are two analogue inputs (both are 0-12V DC outputs from analogue thermometers).
c. The processor must provide adjustable normalisation for each of the 2 analogue inputs.
d. The processor must compare the 2 normalised analogue inputs (with adjustable hysteresis); to produce a 12V DC on/off output.
e. The main processor must process multiple 12V DC on/off inputs (including the 12V DC on/off output from the above comparison of analogue-sources), if/and/or/not/then logic, and multiple 12V DC on/off outputs (for heat-sources, valves and heat-outputs).
Could you please suggest suitable Velleman components, and any other advice you feel able to offer