Let's Make Robots!


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What are the must-have components?

Hi, i'm actually waiting for my picaxe pack, and with it i ordered some components like 330Ohm resistors and few leds, but i realized that i'm gonna need more stuff, so i'm going to order few additional things. Can you tell me what i should order? I think i'll need 4k7, 10k, 22k resistors, 4,7µf capacitors, and... and what? I have no idea...
Thanks for your help...

Saturday afternoon

Its a nice warm saturday afternoon and im sat here with my headphones on listening to music while my missus sleeps and my daughter is out swimming, theres a window next to me with a great view of the world going by and im about to start working on my cat laser project.


Im trying to make a power supply for it so ive got lots of soldering to do this afternoon, im hoping i can get the hardware built so i can start programing this afternoon.


What are all of your plans for your weekend and what are you all up to at the moment?  

Help with Sharp IR code

Im kinda new to this programming stuff so this is probably a really easy question. How do i get my robot to react to a increase or decrease of 20 points from my sharp IR. Right now  my code looks like this (b1 is IR reading)

if b1 > 115 then
 end if

 if b1 < 85 then

 my sensor reads about 95 when its on my black table but with different light sources or materials it can jump up or down. Instead of using 85 and 115 in my code i want it to react whenever there is a change of a specified amount.

Sharp again - part numbers confuse me

I am shopping for Sharp distance sensors like the one used in "Start Here". My local mail order supplier charges €26 and I am boycotting them for that reason alone.

So I am searching for other suppliers and I find confusing part numbers. I understand the difference between Analogue and Digital sensors. I want the Analogue kind. And I want to measure distances up to 11.8" (30cm).

Are these parts all that different? 


Several questions about picaxe, servos, servo-controller, connections, and life in general.

Hi everybody, i'm starting to have a lot of questions in my mind about the Picaxe, so i think it's time for me to open a thread :)

But before, just two useful precisions :

Artduino/processing resource

Was just looking for a good example to use to test my light sensor out and found this site: 




Looks pretty handy for examples.  

Ardunio Motor Control

Hello all

 just a quick note on building a motor control board for your Ardunio, use the following circuite:



 This will allow you to drive two motor forward and reverse using just a L293D, a 7404 and a few caps and resistors.

Note this is good for about 600ma continuious, so don't cook it!

Wireless for cheap?

I was wondering how would go wireless for cheap, i was thinking of using ir or rf but where would i get parts for them?

Jansen Walker Toy (sized) Bot

Hello everyone,

This is my first post here, don't be rough.

I stumbled on the this site about a month ago while doing research on a bot i'm building that's similar to Rik's current Jansen Leg project, that's actually what I was searching for when I found the site.

Anyway, I wanted all of you input on my project, my version uses a similar leg design and I'm curently planning on powering it with two servos and an Arduino-clone.


Airborne bot

I thought i would move this to here for now as its taking up space on the home page that could be used by more interesting proects. 



Electronics can.... "lubricate" the mind.

I've been working at my new job for two weeks and all is going great, until I start making some power cables that have a gasket I just can't get around the diameter of the cable. I don't have strong manly arms, just puny girly arms. I was trying to think of what would work best. All I had around was dishsoap; wasn't able to use that because it's slightly conductive.

I decided it would be best (and cheap) to just get some mineral oil. Non-conductive and a great lubricant!


Software PWM

I was hoping to avoid wrighting my own software pwm for the pic but it looks like i've arrived there.  the motors and tracks I hot glued toghther don't drive straigh so the only way I can think of fixing it is to use PWM to slow down one motor.  I know I could use the one hardware pwm to slow down just one motor but thats going to be used in the future for somthing else so I have to create the pwm myself in software.

Punchable/stompable switch

Hi, guys. I remember reading somewhere (maybe LMR, maybe Make Magazine?) about a DIY way to make a sort of electrical switch that closed a circuit when it was punched or stomped. It had something to do with a layer of foam between two contacts -- maybe the foam was partially conductive or something? I'm working on a musical project that involves recreating something similar to a DDR dance pad, and I'm trying to figure out how to make the pads. Does anyone know what I'm talking about, and maybe have a link or something? Or does anyone have any ideas that might prove useful? Thanks.

I just couldn't wait...

I really want to build the famous StartHere robot, unfortunatly right now i can really afford the almost 100€ needed for it (i'm actually waiting for some extra money, but i won't get it until at least one month). So for days i just keep reading LMR, and reading again, and reading again, and explore the picaxe manual again and again and again...

Robot guitar amplifier

OK, here's what I'd like to achieve: I want to "robotize" my guitar amp so that I can record and recall each potentiometer's positions (i.e. volume, tone, reverb, etc.).

Why is that? Because I don't want digital voltage controllers to interfere with the signal path within the tube amp, hence the need for a mechanical actuators for each potentiometer.

I already have some designs in mind, but I would like to know what kind of parts I should get (i.e. what kind of servo, what kind of optical shaft encoder).

I'm looking forward to read your advices


RC Car question

Okay, I am doing a large (for me as a beginner) project. I am using an Alera DE2 board and basically what I'm going to do is make a decoder for a bluetooth USB that will take signals from a Wii-mote controller and use them to control a wireless RC Car.


I have gone to this site:




Selecting microcontroller - What to look out for?

I'm working on a semi-autonomous robot, controlled via RF. I started off using the BS2, which I pick up from school.


however, i requrie something that can incorporate C or Flash as a control interface. So far, I'm only aware of PICAXE & Arduino, but I dun really understand what's the difference.


My component list are as follows for now:

1) IR sensors

2) ultrasonic sensor

3) DC motors w H-bridge

4) RF transceiver


what MCU are suitable for this application & what specs do I have to look out for?

Arduino C, IF/THEN IF/ELSE with ranges

How do you define a value range in an IF statement?  I.E.  IF  analog.Read1 >= between 3 and 5  THEN do something