AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |
Back to Blog
Wifi battery shunt11/25/2023 ![]() If it’s just voltage you want to measure, then this is ideal, and installs with ESPHome. You may want to check out this video from Chris (easy to follow and build from this). Incidentally, you are never to old to learn. If you do find time to answer, I’d appreciate it, because I always love to learn new stuff. … and this is where I get even more wobbly … am I not putting a cap or a mov somewhere to protect this circuit when the inevitable blart from some power spike in the system rolls through? If so, before this voltage divider circuit? Or after? Where? Do those two lines join at the analog pin of whatever microcontroller I use? There’s another signal path that comes from just before R2 and it goes to … That joined lead heads off, and … this is where I get stuck … It is there joined by the - terminal, which has passed through Resistor R2. The one that’s connected to the battery’s + terminal goes through Resistor R1. Those two leads (now neatly connected to a perf board) head over to some resistors. So I’m understanding that to mean, it’ll be connected across the battery, + and. On the left of that image it says Source Voltage. I’d like to tell you what I see, and you can tell me how wrong I am super useful info.īehold as I display my ignorance it’s a miracle I haven’t killed myself yet. So I’m looking at the circuit diagram in your Ohms Law Calculator, and I’m trying to figure out what that would look like arranged on a piece of perf board. You must appreciate that my degree is from UTube. Nevertheless, I’m also the kind of stubborn bastard that gets annoyed when he can’t figure a thing out, which is often, because of not being generally fast on the uptake. Look I’ll be honest, I’m more competent with a circular saw than an IDE, is part of why I use ESPHome. Suggestions of both sensors and totally different approaches are welcome. My initial googling says that INA219 can monitor a 12V current, but having never worked with it, I’m concerned that it might catch on fire if the load is relevant. I have both ESP8266 and ESP32 chips in stock, breadboards, soldering wire, etc etc. I’ll use automations to alert me if the voltage drops below a certain point. ![]() So I want to monitor the charge level of a 12V battery that will likely trickle charge all the time. Out here on the perimeter, there are no stars. ![]() I think I can spring for a sensor, but I likely couldn’t afford a management system. Me being me, I’d like to make this out of what I have on hand. Buying big kit is not a thing until the next harvest is in. That means I need to monitor the health of that battery pack, so that I can manually intervene if necessary. It recharges a 12v backup battery, but not fast enough for the kind of stupidity we’re seeing. So for my existing setup in the farm store, there’s a 12V (Meanwell?) power supply that drives the IP cameras, the network switch, and the wifi antenna that links to the main house. Replacing a battery regularly is cheaper than replacing industrial power tools regularly. If there’s stuff you can’t afford to lose that’s in a shed somewhere, best you find a way to keep the cameras up. One of the many exciting side-effects of this is increased theft because affordable backup batteries aren’t designed to be deep cycled 3 times a day. We experience this as 8-12 hours of power loss per day, usually spread out into nice little 4 hour chunks that screw up production most optimally. My country’s power infrastructure is collapsing because of reasons. I don’t know enough about these kinds of sensors to know if that’s going to be a problem or not, and is the thing I’m most worried about.Ĭan you recommend a good, affordable sensor for this application? There will be 6A of load on the battery when it is discharging. I’m thinking of an ESP8266 (cos I have one) with a sensor. I need to monitor the state of a deep cycle 12v battery that is usually trickle charging, and report on its health at regular intervals. I need to do a thing which is likely completely trivial, but I have never done it before, and because I am a farmer, I need to do it without having to spend much money.
0 Comments
Read More
Leave a Reply. |