Let's Make Robots!

solar

Built this little guy for a mate of mine. The main housing is from a speaker set designed to plug directly into a small MP3 player. The base is a machined aluminium … Read more

step-up or joule thief or.. ?

I`m trying to convert the wireless doorbell outside from battery to a renewable source such as solar or wind. My problem lies in that the battery required is a 9v.

My first thought was to produce a high enough voltage to charge the 9v but that might require more solar panels than I have. The 2nd idea was to use a lower voltage battery or super-cap as replacement and stepping up the voltage to 9v. I haven`t taken any measurements of current usage but I don`t imagine it could be more than a couple hundred mA while pushing the button and much lower in idle.

Meet Mr. Lobster. He's big, ugly and lazy - but he's also environmentally conscientious. Now in full-colour video! Wow! Read more
Act cute, try to keep itself charged
Using a
Not much to say about it at this point; this little guy is basically going to be a living ornament. Read more
This a s flexible solar cell from outsidesupply.com. Its rated at 3v and 25ma, but i get 4v out of it. It comes with free shipping. Its very flexible as you can see … Read more

why won't my phone charge?

HI I NEED HELP! PLEASE?

;-)

Just kidding. This is scraping the bottom of relevancy though.

Could you perhaps point me to a good documentation source for charging a 3.6 V battery in an old Nokia? Or could you solve my problem directly for me?

My dad is about to go walkabout in the south of Europe. He bought a 12 V photovoltaic power source that folds like a wallet. He seeks my help on the simple stuff, like mechanical compatibility of connectors and pinouts. And soldering.

Go forward and turn because of allignment :)
Using a
Well I am waiting for my version A.5 picaxe and got an idea for this little guy. He is not fully done yet but getting there. Stevie is a BEAM bot/Solar Roller. As … Read more
Tracks the sun and moves a solar panel
Using a
This is a solar tracker that I'm working on.  It's a stationary robot that will keep a pair of solar panels perpendicular with the sun so that they can charge … Read more
Update - added a front bumper switch The switch is activated by a horizontal bar, and currently only triggers the camera to take a photo. Description This is a … Read more