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.

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***

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')


Ideas for "portable" or "backpack-ready" robot

I find myself more and more out in the non-robot-speaking world telling people that I "build robots". From there, there is a long pause and then me, stuttering through a terrible explanation of what these "robots" actually are. I have tried words like "electronics hobbyist" and "educational robots" and "classroom settings" --I have even tried "hardware developer specializing in the domestic,hobbyist and educational fields". Its usually a tough crowd though.

How to force a floating pin (tri state?)

I am well on my way to making a fancy logic probe from a LCDuino. Just to fill in, I started with making a probe from a TL082 dual op-amp which works quite well. I assumed that making the same thing out of a microprocessor would be a peice of cake but man, this whole binary/digital thing is sorta getting me. I think I may be trying to make a (what is it?) tri-state thingie...

Calling on Folks with Magic (Android) Phones

If you have a mobile phone (that is running Android 2.0 or higher) and a bluetooth-thingy plugged into any kind of microcontroller, please drop me a line.

Chris the Carpenter
rocketbrand@gmail.com  --or-- you can click "contact" on my profile, it will go to the same place.

Help with installing Andriod SDK (Solved)

It pains me to ask for help here, but it has been 2 fairly solid days of installs with no luck.

I got a new fancy phone (HTC Evo) which runs Android 2.2. I of course, want to get this phone talking to various robot brains. I did the usual searches and it seems that no matter what you are doing (android to arduino, android to processing, etc) they all start with installing the SDK. In my case, I plan to use Processing 1.5.1 which is "android ready".

I have downloaded the new version of processing and installed it. --No problem

Getting the internets to talk to my robot.

I swear I did my googling first. The problem actually, is a bit of info overload. Need some simple answers...

I would like to start looking at "connections to the internet", software on the PC and robot-brains. Assuming that the microcontroller part of things would just be a I/O device via say, Bluetooth, I think I am really asking about the connection from "internet" to software on my computer.

Wild Thumper --Voltage drop with no current

So this is a new one... and sorta weird.