Let's Make Robots!

What would you call a "Wiper"

I have searching mouser for 1/2 hour now and for the life of me, I can not figure out what to call one of these things. "Wiper" gets me nowhere. I am looking for a small copper contact, sorta springy, that would ride along an exposed trace on a PCB. Specifically, I am trying to transfer power through a rotating joint. This would involve 6 concentric rings etched on a pcb with a 6-pronged "wiper" on the rotating part above.

What is the fancy name for these things?

L298 Paralleled as a single motor unit

Can I parallel the inputs and outputs of a L298 (That's the one with the funny off-set pins NOT the L293D) and double it's current capacity? It is rated at 2 amps per --I would be looking for 4amps total going to one motor.

I am shopping for a store (Recomendations)

I have jumped in, two-feet-first into this idea of making a living selling robots. It has been an incredible amount of work. I think the ducks are now in a row, I have kits on hand and instructions written etc. The website is even close to done.

8 ADC inputs Need Slave Chip


It looks like I am going the brain/ multiplexer route here and will make the ultimate line-follow sensor of death. Led's will be off of PWM for brightness control, white/black threasholds will be adjustable and now I have decided that adjustable pull-up resistors would be handy too. I figure that a simple trimmer pot connected to the common of my resistor array would do the trick, but I would not mind some feedback on the issue. I have added a second video with an explaination. Thanks in advance.


**Original Post***

WiiCamera Break Out Fail (Not my fault)

It seems that God is not without a sense of humor...

So, I had a bit of a run there for a while of producing boards which later became coasters. Bound and determined to not let that happen again, I set out to design my WiiCamera break out boards. I carefully layed out the circuit, breadboarded each and every part, and then designed a neat, simple PCB around the breadboard circuit.

Looking for SMD Motor Driver Suggestions

Yup, I am on the surface mount band-wagon....

This is a call for any and all suggestions for a SMD motor driver chip. The obvious is the good ol' L293D but hey, I am always looking for something better.

By the way, I am looking for something with similar specs to a L293 or smaller. I will be running a couple of those tiny micro metal gear motors or possibly GM9's. Consider the GM9 to be the biggest motor I would use (in terms of amp-suckin')


Write LMR (Manual Mode)

I was filling some gaps of time and once again, started playing with my little drawing bot. A truly sad little bot that has never really found a calling and receives none of my attention. Never the less, I did manage to build a nifty pen-lifter thing and stick a bluetooth module on. As seen in the video, just regular ol' RC control (except via the tilt of the Android phone) with a Sharpie stuck down the middle.

Please don't expect to be impressed.

Wii Camera BreakOuts

I just finished and sent off some break out boards to support a wiicamera. These boards use the camera after it has been removed from the wiimote and communicate via i2c NOT the standard bluetooth connection of the wiimote. Included on the board is the necessary reset circuit and 25mhz crystal. There are a total of (4) .9" mounting holes to match 2-56 hardware. 2 of these holes match the hole pattern of the servo horn of the "LMR standard" blue servo. Pull-up resistors are also on board for the i2c lines. The board requires and has a 5-pin header for: