Let's Make Robots!


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Snake Robots

I always thought these were very cool.


Version 2 of the newby robot..

Hi Group:


Am absoultly new to this, and fully intend to build the first version of the robot on these pages... However I really like the "Cup grabber" version ... Could someone here tell me how the heck one gets the arms to bend over to grab the cups? I buying parts for version one, BUT am also buying parts for version 2 as they are pretty much the same thing... TIA ... John ... Butler, WI USA.

help make herbie, feivel, junkbot, etc.

Hi guys,

I'm tryng to make a herbie circuit but can't get it to work. I attached a link of my EXACT circuit on a breadboard. Can someone tell me what I am wiring wrong?

herbie circuit:


my circuit:


Night vision camera

Hi, I've been thinking on building a night and day vision camera. I think its very straight forward, but I just wanted to have a look at your personal opinions before going any furtherer.

The idea is very simple: As you probably all know, digital cameras are able to "see" the visible spectrum, but also, some frequencies higher (I think), and lower. You can try this by pointing with a remote control to your camera, you will see a white light.

Where are you ?

I want to thank all of you, and Frits especially, for this forum.  I have learned so much here in a short time.

I would like to suggest that everyone include where you are located in your posts, maybe using the Auto Signature.  I think that would add a lot to the experience.

Thank you,

Duane S

Wilson, North Carolina  USA



How do you choose motors for something like http://letsmakerobots.com/node/87 ?

I've bought two motors (no gearbox, just motors), hooked them up and expected it all to be a little bit "nervous". However, they can't move even that little thing, only can spin in the air.

So... what would you guys recommend? Could anybody just give a little explanation, like "Motors FAQ for dummies"?


A Playstation controller as remote controller

So, suppose i have a couple of those wireless radio serial modules.. I'd like to hook the receiver to my robot, and install the transmitter on a playstation controller. Now, given that i can make a protocol of my own, the question is: how can i interface with the controller buttons&joysticks ? i'd like expecially to read the analogic joysticks.. is it hard ? How is it build inside ?

help with wheel/motor

Hello everyone! I have a motor but I don't know what type of wheel I need for it.

This is the type of motor I am using:


 I want to put a big wheel on it (not too big) so if anyone can help me find one that fits....it would be great!

micro controller programmer..

hi frends,

i hav started doing one simple autonomous bot..wich needs some programming.

i got some 40pin micro controller..but dnt hav programmer kit ..since the microcontrler burner kit  is very costly, i cnt afford..

so telme some idea to design some simple burner kit...even if its specific for some IC no probs... 



it wd b very useful if u send some design of burner kit..wit corect specifications..


thanks guys

Serial communication problem

 I am trying to interface my arm9 based single board comp to the PICAXE 28X1 (starter kit board). The idea is to interface the single board computer running Linux to my PICAXE over serial and try to send commands to it over the serial line. I wrote code for my PICAXE that can listen on the serial line and transmit the same characters back. The arm board recives characters sent by the PICAXE but for some reason characters sent by the arm board are not recieved by the PICAXE.

New ways of seeing things..

Hi all, I am so excited about this. It may not be much to anybody else, but to me it is!

You all know how we only have the IR's or the Ultra sound to work with when we want to check distance? Yeah, if we have millions we can also get a camera or two, and laser range finders..

However, I wanted something cooler.

This is not that, I am sorry.

However, I am working on something cooler (I hope, but it may be far fetched), and when doing so, as a spin off I made this. 

And it is pretty wicked, I think.

Simple tracking project

I have been thinking about this, any ideas? i mean like what components i could use, using radio frequency not rfid or neither gps. could really appreciate help.


Baiscally it should have a screen where i could track my robot within 100m? try to keep it cheap i guess 









It is supposed to be something like a phone where it has a screen and i can see the object like a radar. it would also make me able to flash an led at the other end of the wireless device p

Robot with Tracks

Hello, just a question to all who made a robot with the tamiya track set: did you implemented any kind of track tensioner? or just calculated the size and "stretch" it over the sprokets&wheels ?

Help with motor driver?



As many of you know, my experiences building robots have been painful at best. So, I'm taking a step back, and I will follow Frits's wonderful tutorial.


Because I live in America, I'd prefer to buy my parts from a U.S.-based site to avoid longer shipping time,additional fees, etc.


I've run into a problem: Frits's tutorial calls for 1 L293D Motor driver. At mouser.com I found a short list of products similar to what I need.


Which will work?: 

Help with program editor

Ok so I'm making my first robot. I wanted the cheapest one out there so I'm trying a similar project to Fritsl's Little 8 project.

Anyways, now all my parts have come in, and I'm almost done building it but I wanted to try the program editor to see if it worked all right, so i hooked up my motor board to some power, to some motors and hooked it up to my pc. See the thing has a switch thing that you can change from "prog" to "run" so the board has a run mode and a program mode (I'm sure people who've used it know what I'm talking about)

Serial to Ethernet adapters work with picaxe?

Will a picaxe work with a standard serial to ethernet adapter?  I thought it would be nice to be able to connect it to my laptop via ethernet since my laptop doesn't have a serial port.  I have a usb-to-serial adapter but I'm always forgetting the damn thing and since I'm a network admin I've always got ethernet cables lying around.  I've done similar things with reprogramming dead routers remotely (have modems connected to the serial ports and just dial in to reprogram)


dealing/separating strings in BASIC

I didn't know whether to put this in absolute beginners or here..

anyways, what i'm trying to do is use my ADC port to get some values from one of my sensors and once i've done this i want this value to be displayed on a three digit seven segment display. I know how to right single numbers on the 7-segment display, but i wouldn't know how to deal with, say, a three digit number. 

header pins question

Does picaxe 28x1 microcontroller board use 0.60 - 1.0mm header pins (round or square).

Another Ultrasound Sensor

Hey guys, check this so far unknown UltraSound sensor:


I kinda like, compared to SRF05.. maby.. :)