Let's Make Robots!

IR Homing Beacon?

I'm looking to build an Beacon, IR or otherwise, that a robot can see and simply drive to. Pretty much like a docking station for the robot to be recharged or a robot that follows you. (unless that's something different...)

I did a few searches, but I've only come up with robots that use a beacon and not how to build the circuit and write the code.

Any help? 


Edit: 8.31.09


I don't know if this helps, but I'm pretty much looking to build what CtC did here: http://letsmakerobots.com/node/6499

Project robot actuators ....stupid ?


there's some months I managed to create éléctric actuators, consume 3v and powerful enough to create a small robot, but now I do not know what to do with it :s

I made these actuators to create a hexapod robot, but now when I think it seems me stupid and it will be too expensive to undertake ... I'm so broke :D



 the system looks like this 


Tiny light-seeking robots


Embed video doesn't wotk with Vimeo so have a look here.

More infos including how-to here...

Should we kick out vendors? Please vote!

Question: Are we seeing too many vendors on the pages, making challenges and pretending to be friends and stuff?

Write ***Y in comments below to vote Yes to the above question

Write ***N in comments below to vote No to the above question

We ARE planning to see lots of vendors products in a new components section that we are working on. But I am sure that will just be nice for all of us; Cool products nice to browse, and a nice place to showcase what you sell (unlike now where it is a not so nice list)

Omnidirectional Camera (using Christmas Bauble)

Take one Round Silver Christmas Tree Bauble circa. 60mm and one simple ordinary webcam camera.

Mount the Camera pointing up at the ceiling (or Heavens).

Place the bauble Circa. 150mm above the Camera and Hey Presto you have 360° field of View.

The arrangement can be reversed depending on "Point of View".


Ok its distorted but should be enough to detect IR signals (look at the ceiling light for example).

Personal Helicopter

Better him than me........ Personal Helicopter

Using Google search for LMR

Since we've been getting inconsistent results from the LMR search engine, I've taken to using Google search, and specifying the site.

In case you don't know how to do this, just go to Google and search for:

site:letsmakerobots.com <whatever you are looking for>

For example, if you want to find all references to Mr Basic, you type:

site:letsmakerobots.com "Mr Basic"


help in building a robot

Hi every one..i am a first year student of mechanical engineering i want to build a robot so can any one help me out in this...

LMR Shirts!

I was looking around yesterday and saw an idea for official LMR shirts! I figured it would be nice to have a shirt expressing the awesomeness of LMR.com, so I looked into production of these.

Idea 1:


(your username and usernumber would go on the back...)

Idea 2:

Building a Pedometer/Game Prototype

i have this cool idea about a pedometer/rpg gadget, that lets you advance through the game by walking/exercising. Just a simple little gadget with an lcd screen and 3 buttons (tamagotchi-esque). Think of something along the lines of what Bandai is doing and has been doing in the past. see screenshot.

Question: Turn on a pin on a parallel port

I need a program to control a pin on the parallel port.

It need to work on windows xp and it needs to turn only one pin on.

The idea is to turn port D1 on with program: Pport1 for example

and D8 with an other program

so that with my project with voice control I just need to start the program with the voice control softwareto turn the port on.







Danny Temmerman

helicopter project

hello there.i am new to this forum and i am about to built a controller that could control the tail of the helicopter model.

something like a heading lock gyro.have anyone any idea for how can i do that or any similar project?thanks for your time time and looking forward hearing from you

interface with atmega8 with parallel port

Does anybody of LMR knows how to for example turn port D0 on the atmega8 with the pc linked to the atmega8?

For example when I start this program the atmega8 turns on port D0 and when I turn an other program on port D1 turns on.

Which program do I need and what circuit do I need?

Can somebody give me an example program?







Danny Temmerman

Where have Picaxe & Techsupplies gone ?

Where have Picaxe.co.uk & Techsupplies.co.uk gone ?

Both websites seem to be down ? Have they both gone bust ?

PICkit2 programming and ICSP?

I need to implement this into my robot but I am not sure which circuit is the correct circuit to use.  I want to program the chip without removing it from

the circuit.I would obviously prefer the first one but if the second one is better then i would go for it. Please give some advice. 


Voice controlled room

I have an idea about a voice controlled room.

I would use an atmega8-16PU to switch lamp and other items on

I have an old pc laying in my room with windows 2000.

It has a serial port, a parallel port and 2 usb ports.

I want it to interface with my atmega8, but I am wondering how you use voice control with it.

I could also use an arduino, but for now I am thinking it al out.

This is an idea for home automation.


So does anybody now how I would program my pc for voice control.

Hole size on a mini servo horn? (+ where to find hex spacers)

Hi, i've got some miniature servos like this ones :


and i'd like to know the size of the holes on the horn, but not the center hole, the other ones which are pretty small... Does anyone know what kind of screws i need? M1 maybe?

Actually, instead of screws, nuts and bolts would be perfect for me, do you know if (and where) i can find those at that size?

And i'm also looking for that :

IR LED's. blowing out

The 2 diagrams are cicuits for driving led at 38khz. I implemented both circuits. Firstly i take the second cicuit from the link and just add on the transistor part as seen in the first circuit. I did not add the 4.7kohm resistor nor did i add the 47ohm. Is that the reason why six of my leds are blowing out?



the circuit over here http://marwww.in2p3.fr/~levansuu/projets_es2i/Parallax/stamps%20in%20class%20website/downloads/rob4.pdf