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Cheap solar battery + wireless IoT node


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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 (A

The options are 1) a complete sealed setup, using the appropriate sealed penetration connectors, capable of holding against the pressure inside and out due to temp changes, 2) run the containment at a

Due to this thread I went out and picked up a handful of these at the dollar store.  These came with a AAA ni-cad battery. @cubeberg  I took a look at the specs for the battery and it looks like they

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@@Lgbeno - I'm in for 5 if that's cool.  

 

@@Lgbeno Please put me down for two units. Thanks!

 

Awesome! @@dubnet, I sent you a PM and cubeburg, I'll send an email.

 

I've been testing the supplies for about 24 hours now and still going strong.  First I tested the voltage output, then I hooked up one of my Droplet Wireless temp sensors.  It is setup to transmit every 10 seconds and keeps chugging along.  Here's the data:

 

 

Next I'll add current and voltage measurements :)

 

Voltage Output:

post-30430-0-04072400-1431032413_thumb.jpg

 

Solar Cell Current (battery voltage is 1.248V)

post-30430-0-49204600-1431032486_thumb.jpg

 

The final product:

post-30430-0-28556200-1431032534_thumb.jpg

 

The particular light that I bought from Home Depot had a nice area inside of it for Electronics.  So far this has been pretty rain proof and still breathes to keep out condensation.

 

Also, I kept the LED connected and that was drawing power all night as well so I'm thinking that I'm net positive on the power budget.  Time will tell...

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Got my boards today!  Excited to this these out.  Wife is out of town for a week, so I should hopefully have some spare time to try it out.  I still need to put together a board - I've got some 2152's (20 and 14 pin) that I got cheap from Newark - looks like they've still got a bunch of their MSP430's on sale (example - http://www.newark.com/texas-instruments/msp430g2152in20/microcontroller-mcu-16-bit-msp430/dp/24T4648?CMP=AFC-OP?gross_price= - $0.55 each) - need to see if the NRF library will fit and whip up a board.  

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Well there is always this one http://www.newark.com/texas-instruments/msp430g2302in20/microcontroller-mcu-16-bit-msp430/dp/24T4680

 

Those are crazy prices.  For fun I did a search on Digikey and found a SiLabs EFM8 for 35 cents, crazy...

 

Anyway, I digress but I was able to get the current sensing up and running in my solar light.  It looks like there is plenty of power being produced.

 

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Looks nice!  Any idea if it'll hold up to sun as well?  I have some cheap dollar-store "tupperware" with a seal - but I seriously doubt it'll hold up in the sun.

 

BTW - got my first single-battery node up and running this weekend!  Works like a champ.  Just need to modify my code to take the battery voltage from a pin so I can monitor drain.  

Already started converting a radioshack rain sensor to a custom board - it'll be powered by one of these as well.  

Anybody have experience with inexpensive waterproofing?  I saw some suggestions of clear nailpolish and clear polyurethane spray.  Needs to be easy enough to come back and re-solder if I have to fix something or add a connection.

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http://outdoorproducts.com/watertight-boxes/

 

Yes, i,ve had one in my mouser shopping cart for a long time at $25 then Saw these, quickly tossed 4 in the card and my wife just looked at me strangely.

 

Its polycarbonate as far as I know that stuff does well in the sun. Im sure it will ultimate breakdown but it will take years.

 

 

Sent from my iPhone using Tapatalk

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Looks nice! Any idea if it'll hold up to sun as well? I have some cheap dollar-store "tupperware" with a seal - but I seriously doubt it'll hold up in the sun.

 

BTW - got my first single-battery node up and running this weekend! Works like a champ. Just need to modify my code to take the battery voltage from a pin so I can monitor drain.

Already started converting a radioshack rain sensor to a custom board - it'll be powered by one of these as well.

Anybody have experience with inexpensive waterproofing? I saw some suggestions of clear nailpolish and clear polyurethane spray. Needs to be easy enough to come back and re-solder if I have to fix something or add a connection.

http://www.mouser.com/Search/m_ProductDetail.aspx?Techspray%2f2108-12S%2f&qs=sGAEpiMZZMvJqaFk9BIiv4zFCTyhAuSzRGnZB8oiqmU%3d

 

You might want to look at this.

 

I don't think it will make it water proof but will greatly reduce environmental exposure.

 

You can burn it off with a solder iron (dont' inhale fumes) or i saw a remover pen on time.

 

 

Sent from my iPhone using Tapatalk

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