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Jun 30, 2020 at 7:16 comment added user1876484 @EdgarBrown: you've convinced me and I will go the Arduino NANO + relay route. Could you, please, explain or schematically show how do I connect all the 5 parts: Arduino NANO , relay, solar panel, solar charge controller and the battery? Are you aware of solar charge controller/battery with suitable parameters on Aliexpress?
Jun 1, 2020 at 11:26 comment added Russell McMahon An Asian sourced Arduino for a few $ US is a very flexible and capable solution. You could perform your basic task with a package of hex Schmitt triggers acting as a delay and timer (which is the sort of solution I used to use long before Arduinos existed) - but if you want to change any parameters or add complexity the Arduino wins hands down on flexibility.
May 26, 2020 at 21:51 comment added Edgar Brown @user1876484 I can envision a solution that uses two ICs (a PIC12HV615 8-pin microcontroller and the above solar charge controller) a couple of transistors and diodes, a couple inductors, a few passives, and a very large capacitor (to store power for the pump). A nifty little project that could teach you a lot, as the PIC would be doing both the high-voltage storage and voltage regulation for the pump. The most expensive part of this would be the PCB.
May 26, 2020 at 9:00 vote accept user1876484
May 25, 2020 at 2:50 history edited Edgar Brown CC BY-SA 4.0
Added explanation on how to put together a workable circuit. ; added 56 characters in body
May 24, 2020 at 23:59 comment added Edgar Brown @user1876484 in more than one occasion I have gone the route of designing that “simpler circuit” and regretted not having just used a microcontroller at the end. I’ll edit the question later to add some suggestions, but a microcontroller is nowadays the cheaper/simpler route (the type of timer IC I would have used for this (CD4541) I have recently found to be obsolete).
May 24, 2020 at 22:42 comment added user1876484 I have already used Arduino for this type of things. So I actually wanted to know what are those more simple circuits in order to decide whether my experience is enough to build them or not. Thanks!
May 24, 2020 at 22:17 history answered Edgar Brown CC BY-SA 4.0