Let's Make Robots!

Rocket Brand Studios New Products 2.7.12

The new products are in! The new products are in!

Need Metric Person to Measure A Pencil For Me.

Are there metric pencils?

If there is someone out there in the Metric World that has a set of calipers, I would really appreciate it if you could measure a pencil for me. Just a regular pencil, the most common one you would find in your particular country. Please measure from point-to-point or corner-to-corner to get the widest part of the hexagonal. Do not measure flat to flat.

I could really use the measurement to the 1000th (ie .000) and I would take it in either SAE or CM. Oh, and I would be curious as to where you are too. 

Everyone else is doing it HC-SR04

Ok, Ok... You convinced me! I broke down and bought a few of these El Cheapo SRF05 knock-offs (HC-SR04). It was Jax saying he got his working that put me over the top. Now the real question is  --is there any way to convert this 4-pin set-up to a 3-pin set-up? Currently, trigger and echo are on different pins, is there any way to connect them? I figure diodes would be in order, but for the life of me, and after a bunch of sketches, I can't seem to figure it out. Thoughts?

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

****UPDATE****

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.