I'm developing an automatic plant watering system and have a question about powering it.
The project needs multiple 3.3V, 5V and 12V outputs for sensors, relays, pumps etc
At the moment i'm using a DC bench supply (which will ultimately be replaced with batteries) that powers 3 x LM2596 modules.
All is working fine so far apart from the soil-moisture sensor (capacitive) readings which fluctuate more than they do when tested in isolation. They values do go up or down as it gets drier or wetter but they are too jumpy and it would obviously be best to have them nice and stable.
Is it a good idea to power everything from one source via 3 of the modules? I did try a multi-output voltage regulator that provides all that i need but it was unreliable, i tested them and they had incorrect outputs, including a few that outputted negative voltages when they had positive going in! These are the modules so please avoid them!
I only have experience of simple circuits but wouldn't be averse to attempting to build my own board for this, but it would be great if someone could recommend a module.