Of all of my projects this is one of the the most useful to me. I opened up one of the motion detecting lights ( found at dollar store less than $10.00 ) Then I soldered on clip leads and I charge up used 18650 with a $1.00 charging board from China. I can put this light anywhere and it auto comes on / off as I move into the room, The battery came out of old used laptop batteries. Since it only comes on when it is dark battery life on these is weeks at a time. Since I have extra 18650 I can swap out the battery and always have a spare.
Graham Chiu wrote:That's good information to know about these charging boards. It looks like you can just stick a power bank attached to it and that'll keep it charged for the rest of the year?
I imagine, I have considered drilling a hole from each room outside and running a separate solar panel to a charge controller inside so I would not have to think about it anymore, it would just charge and run.
I now have 3 of these systems hooked up and charging with them, I like having backup power to the grid that just keeps on working.
Fire me boy! Cool, soothing, shameless self promotion: