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Originally Posted by Groth
Nice to see I'm not the only one who grabbed the schematic. 
Looks good. I like how you've used the control/data lines, should make the interface program easier. Let not forget the vital green LED!
If the time constant for your system is large enough, you could get away with just the simple on/off thermostat fan control you have shown, though I wouldn't mind seeing a PWM controller attached to your newly tasked error amplifier. 
What sort of plans have you for the digitals ins and outs? |
Re control/data lines, I really can't take any credit for this, it's a carbon copy of the
original circuit this is based on.
Vital green LED indeed.
A side effect is that it keeps a 10mA load on the 317, but the blinky lights factor is of paramount importance.
PWM. I'd like to do that but I'm wondering if that might be a bit noisy. ?
No real plans for the digital side, just a nice to have thing. Perhaps for switching the heater power level or multiple pumps.