I’m looking for a little help/guidance on setting up a wifi connected raspberry pi that can read DC voltages from a solar panel and report them back to the openhab sitemap to display on my phone.
I have been looking around for what to use as the volt meter and best thing so far is an adrino, but even that has some disadvantage. It can only read up to 5v, I need more like 30v. I think there is a way to divide the voltage down, but not totally sure. Also, it means running an additional item, bleeding off a little more power than just the rasp.
Anyone know another way to do this?
Also, I’m really a beginner when it comes to programming sensor into the openhab sitemap, any guidance here would be greatly appreciated.