Let's Make Robots!

12v battery power and mega-servo conversion kits

Hey, I'm thinking of starting a real project this summer and I was looking for a few parts. The most complicated things I think I'll need to consider are the batteries and motors. For starters, I'm looking for a 12v battery that holds plenty of current. Something that could power a few windshield wiper motors for some time. Lithium cadmium looks interesting.. or I actually might end up using power tool batteries (just had the idea!)

Also, as for the motors, I think I'll use windshield wiper motors. I probably know where to get some, but really I'm looking for some kind of kit that can convert them into giant servos so I have better control. I think oddbot did a post some time ago about this, but I can't seem to dig it up :\

Thanks if you can help!

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Wow, really cool stuff! I'll check all of this out :)

you can build a battle robot from this site: http://www.robotmarketplace.com/store.html

pricy thou...

1. Get a wiper motor. Try MonsterGuts.com, which sells a 12-volt DC motor for only $16.
2. Attach some means of feedback to measure the position of the motor’s shaft. I used a Futaba s3003 hobby servo ($11TowerHobbies.com) rewired to act as a potentiometer, but a 5K potentiometer from RadioShack would work equally well.
3. Connect the motor, the feedback potentiometer and the R/C pulse-width modulation signal to an appropriate motor-controller board. The Pololu Jrk 21v3 ($50pololu.com) is a good choice.
4. Some basic calibration should give you a DIY super servo capable of around 15 pound-feet of torque, enough to control just about any midsize machine. If even that isn’t enough, you can build your servo with a larger gear motor and motor controller.

I've seen some posts on youtube on making big servos. It's something I need to do (eventually) for YardGnome.

Take a look at this video.

For batteries, have you considered 12V gel cels from mobility scooter and powered wheel chairs? Some of the beefier kids' ride on toys may also have good batteries.