cubeberg 540 Posted March 25, 2015 Share Posted March 25, 2015 I've got a bunch of sensors in my house uploading data to my phant repository - but I decided to start looking into placing sensors outside as well. I purchased some $2 solar sensors from Target (Apparently they're frequently available from the dollar store as well - I'll check into that) in the hopes that I could use them to power an MSP430. The ones I purchased only provide ~1.2v of power since they're single battery. They're 200maH as well, but I think that will likely be plenty for my uses. Since one wouldn't do it - I used two in series. At full power - that should be around 2.4v - perfect for an MSP430. I added a diode between the two just in case, and clipped the LED to avoid unneeded battery usage. Hooking directly into the battery means that I get power all the time - great since I didn't just want power at night. Plus - the power output for the LED is apparently pulsed - probably not good for the MSP430. I've been watching the sensor values today - it dropped a bit overnight (very little to be honest - about 0.05v), but it's charging nicely right now. I need to get a better container - but for now it's in a cheap tupperware container inside of a ziploc bag. Apparently the dollar store also sells locking containers with a gasket that would be perfect for this. Here is my analog.io graph for battery level. I'm not calculating the actual voltage - but it's out of 255 - 255 being a 3v reference voltage (technically vcc/2 compared to 1.5v reference). So 198 is ~2.33v. Next up - I've got some radioshack weather sensors (rain, wind speed & direction) that I'll be ripping the guts out of and replacing with MSP430 brains. They'll get solar power as well. CorB and bluehash 2 Quote Link to post Share on other sites
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