Let's Make Robots!

Super beginner

hey guys, any chance i can find a dictionary or a glossary of words and terms used in robotics?? I have just introduced to robotics and i rerally would like to build one of mine own but i know nothing about so i am searching all over the internet i so i can learn...  any chance for a little help?

IRobots Soft Morph locomotion - Jamming

How is this for new organic like movement for your bot.

URL :- Soft Morph Locomotion

also link here :- chembot

rocket challenge

please keep working on your rocket challenge


Problems with 18f252 port A and port B

I wrote a simple program with MPLAB for my PIC18F252.






org 0 ; START CODE AT 0








MOVLW B'11111111'


MOVLW B'11111111'






Battery Question

Hi all,

I am very new to building robots and don't have much knowledge of electronics, apart from the basics many years ago at school.

However, I got an arduino at the weekend and have started doing experiments with it. I've just managed to take apart a cheap RC toy car and get the arduino to make it go backwards and forwards via a L293D motor driver and a very basic program. There are two motors in the car - the other one is a DC one attached to rack and pinion steering - I've not connected this to the other side of the L239D though yet.

Robot position with quadrature encoder

I'm building a robot for environment mapping. It's a simple "start here"-class robot: 2 wheels, 2 dc motors and a range sensor mounted on a servo. I plan to hook it up with my PC 1st by USB and later on by wireless somehow.

I want it to drive around and send the range sensor readings to the PC which in turn will be building a map of the environment. The hard part will be knowing the robot's position relative to it's earlier position(s). I know this would be easy with a GPS or an accelerometer, however I wish to find a more lowtech/DIY solution, so here is my idea:

Parallel port control for a Mac

Anyone have experience with controlling a parallel (8 or more lines) output on a Mac (OS X)? I want to control my CNC machine with a parallel interface but Macs don't have parallel ports anymore. I need to find a suitable replacement, but a serial port/MCU would drastically complicate things. Please help! What hardware should I get?

Robot parts in Finland: Robomaa.com

Hello to all! I'd like to introduce to you Robomaa.com, Finlands first and only webshop focusing on hobby robotics products.

Our goal is to provide easy shopping experience at affordable prices to all robot-enthusiast in Finland, from hobbyist to hobbyist.

Posting a robot page from DAGU

I was a member of LMR well before I ever heard of DAGU, I miss posting robots but have refrained from doing so in case others felt it was spam. It seems to me if I show the work that goes into making a DAGU robot, from idea to prototype to final product then it should qualify as a robot page as well as a component from DAGU.


Are my designs robot page worthy or advertising?

mosfet problems

I am having trouble with a project and hope someone can help. I have a pwm motor speed controller I bought from Carl's electronics (see http://www.electronickits.com/kit/complete/motor/ck1400.htm). I put this together and it works fine. Then I rigged a n channel mosfet to turn on and off from a rf receiver signal, with just the motor this works fine. Flip the receiver on the motor goes on, flip the receiver off the motor goes off (I used the mosfet circuit in this post from LMR http://letsmakerobots.com/node/4285).

Servo controller using timeframes

I have four servos with the following specs:



 hello everybody here...!!!

Actually m from india . speaking straight, " i can't spend much but also can't live without robotics".

so please give me some advices to not to kill my love towards robotics. i m a student of electronics but here in my college we do not have such facalities for electronics students. so please guide me about how to begin and what resources to use to get over the money problem. 

i really need your help.......!!!!

real shops in London

Does anybody know of any interesting robot parts shop in London town, UK?

I'm on my way there tomorrow on a business trip, and have time to kill.

I'd love to go into a shop and touch and feel stuff before I buy...


TallyHoe! Man Euver

Line follow sensor spacing ??

I am a bit embarassed to be asking this but... With everything I have done with Walter, I have never played with a line-follow set up. Now, the electronics I have down solid but I am a little fuzzy on the theory of opperation. I intend to use 4 sensors. Where do they go?


Control DC motors with an ULN2803

I live in argentina and getting thing shipped here is a mess, so I try to use whatever is available here (which is rather limited) whenever I can.

So I was wondering since I haven't found any of the typical H-bridges ...is it possible to control DC motors (speed + direction) with a ULN2803? These I can buy here. 

If so then how would that setup be? Do I need any additional components? If so then which (transistors, resistors, diodes etc)?

DC motors from DAGU

I'm putting together an order at DAGU. But I need to be sure about one thing. The DC motors (items 12 and 13 in the LMR price list), are they GEARED motors? I presumed they were, but then I mailed Claudia and I asked: "Item 13 (dc motor) in the list: Are these motors WITH gears?" and got this answer: "The DC motor will not come with gears". However I think she may have misunderstood my question cause they do look like geared motors....

Regarding Robots which uses GPS tracking...


I am new to this forum, and I want to submit a project to school on Robots.

Aim: To feed the destination address like NMEA code to the controller and it uses GPS receiver to know its present position and compare with the destination address and move to the destination address specified by using stepper motors..

 Can u pls guide onthese..

How to decide about stepper motors and controllers I thought of using ARM7 whether its OK or not..???

PLease guide me...

Looking for a LCD counter

Hi people, does anyone know where i can find a cheap lcd counter (as described on page 19 of the 3rd picaxe manual)? Ideally with backlight 'cause the goal is using it at night...

(and yes, i searched on google but with no luck...)






Join the LMR CAD Team! We (Krumlink and -Gary) are a group of Experienced CAD users capable of designing stuff in CAD! We use the STEP file types to share files between all (Autodesk and SolidWorks) software. Put your name in below, and begin collaborative CAD design!


This post will be improved upon later, but we will post our collaborated CAD drawings, etc