Let's Make Robots!

Recently Collected Posts

Minimal Picaxe LED blinker

I just found a different way to make an LED blink with a picaxe 28x1:

   inc b0
   let pin7 = b0 >> 7
   ' do other important stuff here
goto main

Hello everyone. This is my next post on this site. This time I would like to introduce you my next project the "BIG M Stepper".                     This … Read more
Balances on 2 wheels, r/c controlled
Using a
      Well I am not sure I understand the phrase 'time to build' but that would be the time it took me to cut the parts and mount the motors, getting it to … Read more
well, it's my first manipulator. ist's nothing special, but it's better than everything i did with this metal contruction box i have. it would be great, when there … Read more
Hello from Russia. On images i sent, you see only a prototype of chasis of my robot. Then i was a child, me and my father go to see a film "Short … Read more
GRoboduino is a robotics motherboard based on Arduino / AVR processor, featuring many on-board peripherals. It is designed for beginners who need an easy … Read more
It’s a pleasure to present the new release of the Motoruino boards! Kits and pcb's available @ http://guibot.pt Will post more info soon, tutorials to assemble … Read more
Hi all, If you are into Atmel AVR's then you might find this programmer very useful: http://www.fischl.de/usbasp/  It is an USB based AVR ISP programmer which is … Read more
I stole/scavenge my son rc car attached the remote to the pc parallel port with a pnp transistor,I put an IP-CAM on it ,and controlled the all thing with a C# … Read more
Learn how to use your Arduino, and blink an LED
Hello all! In this walkthrough, I'm going to show you the basics of the Arduino and how to blink an LED. I know this has been done many times, but since I'm hoping … Read more

Xbee receiving in packets

My xbees are set to 9600 baud. There is a button hooked up to my arduino which is sending "hello" over the xbee to my receiving xbee which is plugged into my computer and is printing to the arduino ide serial monitor. I click the button about 6 times and after each push of the button "hello" is received and printed on my screen. That is ok. But then the xbee seems to stop for a while and i click the button a few times and nothing happens. After a few seconds of delay, "hello" appears on my screen however many times i clicked the button.

RepRap Stepper Driver v1.2 and Next Gen CNC

In the picture from top-left, clockwise to bottom-left: the terminal block (24V power up to 13A), the 2 X-axis drivers, the Y-axis driver (blue heat sink), and the Z-axis driver (blue heat sink), the Arduino controller (direction x3/enable x3/step x3), and just below the terminal block there is a small 9V regulator board to shift 24V down to 9V for the Arduino.  Everything is mounted on an MDF board, and the board is mounted with baling wire.


Darwin is a hacker

How many monkeys on type writers does it take to write the collected works of Shakespeare? Or Asimov for that matter? It has been claimed, but never tested, that a limited amount of monkeys will indeed produce such a work.

Given enough time...

LED configuration for PICAXE 'Testing the System'

Hello everyone. Ground-zero beginner here. I've been a programmer for maaaaaaaaany moons, and I'm using robots as an excuse to learn about electronics. It's strange, yet fun to be a complete newbie again ;)

Some parts are on their way and I am spending my time deciphering the picaxe manual. One paragraph confused me and I think I finally figured it out, but I would like to have confirmation.

 It's in picaxe_manual1.pdf in the 'Testing The System' section when it describes the LED connection:

RepRap 3D Printer

So I am planning on building one of these wonder machines in near future and I just wanted to hear if anybody

has got one.

I also post this because I think this machine is incredible for robot making, and I havent seen anyone mention it, so I just want to put it out there :)




Mendel Specifications

The table below outlines the specifications of the machine.

PWM and registers


some time ago i had opened a forum post about PWM on arduino. RobotFreak gave me a piece of code that made my remote work:

#define pwmPin 11

void setup()  {
  // toggle on compare, clk/1
  TCCR2A = _BV(WGM21) | _BV(COM2A0);
  TCCR2B = _BV(CS20);
  // 36kHz carrier/timer
  pinMode(pwmPin, OUTPUT);

Robotics software (LMR Toolkit)

I saw the program Speed Calculator v1.2 by djhesit8 and I got inspired.

Wouldn't it be cool to have a LMR Toolkit program in which you could do
many computations and simulations to support your robot making process.

Now my question to you is:
What features would you like this program to have? So what processes /
calculations are you doing at the moment that you would like to have

Problems with receiving a signal from LED020


I want my robot to be controlled via IR, I'm using LED020 receiver. I'm using this scheme:

And this code to get any readings from my remote:

symbol infra = b0


irin 0, infra
debug infra

GOTO WaitForSignal

Seek the brightest light in the room
Using a
Feivel was my very first robot. He's a little phototropic (light-seeking) robot built into an old computer mouse case. I'm nowhere near clever enough to come up … Read more
We all know that a robot is supposed to move. Without movement, a robot is just dull. The same goes for pictures of robots. We wanna see them move! Here are a few … Read more

Controlling a DC Motor (Mabuchi FA-130)


I'm trying to run a Mabuchi FA-130 (#18100) DC Motor, it uses 3V and 2.1A when stalled. However, I did some measures and when I forced the motor to stall it consumed nearly 4A, but I think this was some sort of coincidence since It has never happened again.

I'm using a circuit similar to this one posted by Simon Z in his post:


(By Simon Z and taken from http://letsmakerobots.com/node/7990)

For now its almost done! My selfbulid CNC-Mill is ready to use. It all started during my x-mas holidays when I found Tinheads Valkyrie here on LMR. I had the idea … Read more

Vary basic question about headers

This is a very simple question and I am only asking because it is fundamental to my first robot (and I don't have the money to get this bit wrong).

An Arduino and a Playstation 1 Controller

I'm having trouble interfacing a playstation 1 controller with the arduino. the project will eventually be to use it  wirelessly to control a simple robot.

I was wondering if anyone has actually gotten the PSX Library on the arduino website to work and if so how, even if it turns an led on and off.

here are some links

Picaxe 08M and SRF05


I am trying to connect the SRF05 to a picaxe 08M (starter kit). But it doesn't seem to work. I know how to connect the SRF05 to a picaxe 28x1.

Here is the program I used:

pulsout 4, 2
pulsin 3, 1, w0
pause 10
goto main


Thank you.

The 8325HV digital servo from Power HD is the ultimate high-performance servo: it features high-precision digital electronics, a coreless motor, and low-backlash … Read more
Price: $49.95 USD

 Collected by 3 members
The HD-9150MG digital servo from Power HD delivers extra-high torque and features digital control electronics for increased performance. The output shaft is … Read more
Price: $9.95 USD

 Collected by one member
This four-pack of 8-tooth injection-molded sprockets comes with two idler sprockets (with 1/4" holes) and two sprockets with 7-mm holes for use with for use … Read more
Price: $8.45 USD

 Collected by one member
This tiny board is an easy way to use Toshiba’s TB6612FNG dual motor driver, which can independently control two bidirectional DC motors or one bipolar … Read more