Let's Make Robots!


basic obstacle avoidance, two LEDs blinking and otherwise,

*Complete* is not really the correct word for it.  While trying to set up the four pins with screw terminals on my high power project board, my buddy and I managed to completely ruin B.6 and B.7.  After throwing around a lot of ideas, we can only imagine throwing a 330 ohm resister array chip in where the L293 is and connecting a bunch of servos up to it to make it a walker... maybe.  It depends if the board is set up in a way where that is really feasible.  The other option being to buy ANOTHER high power 18m2 project board and move the chips over to it, but I don't like that idea.  If feel like the best idea would be to cut our losses and get ourselves a 28x like the start here robot, since it is so well represented in all of the projects here.





This robot may seem overly simple to most of the people on this site, but my friend and I have absolutely no experience with electronics or computer programming. We are having a few problems getting enough juice out of the cheap little motors I got at Radio Shack, but we are going to try using bigger motors and adding capacitors to cut down on noise.

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direct drive is not the best , using a gear box like




this will help getting the power to the ground with out staling your motors. staling your motors is not good can fry your motor driver chip

thanks for the input.  I will look into getting some gearing options that are low cost.

..to go cheap, you could buy a couple of these at Hobbyking : http://www.hobbyking.com/hobbyking/store/__16265__HK15148_Analog_Servo_17g_2_5kg_0_14s.html

and mod them. You could just remove all electronics except gears and motors and, tada! You have a geared motor which can be controlled by a motor driver. Or if you want to save pins you could mod the servo the other way : http://letsmakerobots.com/node/259. Hope to see more updates soon.

This the place to learn about improving your robots. If you get a chance can you post a video. I can assure you we are all keen to know as much about your project as possible. So don't spare the details.

You might want to consider learning how to convert servos to continuous rotation. That would give you a geared motor and single pin control in one condensed enclosure and mounting tabs to boot. :)

I have read a little about converting servos to continuous rotation, and it seems like the cheapest way to get a geared motor.  I dig cheap.  Its funny how comparatively simple things like mounting tabs are complicated issues sometimes.  My friend and I spent a good amount of time trying to find a simple way to affix our motors to the chassis, and went with a temporary fix, twist ties and glue.

I found myself a Tamiya twin motor gear box for about 8 bucks and picked up a sharp IR rangefinder while I was at it.  Expect updates when that comes in a week or two.  The actual coding in Basic will probably be the hardest part for us.  I think I have it working as is, but I might post the code after I test it out with the new gearbox. 

Tonight I am going to be fixing my engine issues, as well as trying out some new code.  My buddy and I have a few questions that I was wondering if I could put forth to the group.  We are considering turning this thing into a pseudo start here robot.

1.)  does it matter how small your servo is for mounting the sharp IR rangefinder?  The smallest ones I found were also the cheapest (which is backwards in a weird way to me)

2.)  Is there a reason that I won't be able to use my Picaxe 18m2 highpower project board in the start here robot?  I understand that it uses a 28x something or other, but for the amount of inputs and outputs I feel like I can make it work, but does it have some lack of computing strength that I am unaware of?  I am unfamiliar with how servos work and I could be missing something in regards to its use as well.

3.) On a totally tangential note, are there any robotics conventions in the midwest United States?

Thanks for reading even if you didn't reply.  I will post another picture if it all doesn't catch fire tonight.


Yes, we love videos :-) Mogul did already poit this out..."keep cost down" is also one of the main subjects here...

Your questions, my answers:

1. No, the smallest servo will do the job, any 9g micro servo is good.

2. I am not familiar with Picaxe but it should work. Processing power is not the issue, it will be enough.

3. This will answer one of the US guys here ;-) I just know that in NY is the makerfair and LMW will be there as well.


Regarding lumi's item 3, Maker Faire, which is not just about robots, but is definitely a cool event, has multiple locations. The big ones being Bay Area (California), Kansas City, Detroit, and NYC.