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. bluehash and CorB 2 Quote Link to post Share on other sites
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.