Let's Make Robots!

Recently Collected Posts

  I give you the Nano Sumo bot, a collaborative project between myself and Gary. View Gary's post on Mechanics here I think this bot "is" many things. Smallest … Read more
Floid (Prototype 0610) This is the first prototype of Floid, The inspiration came from Frits and his TIRDNKWIIT Robot. The idea being that it will move around by … Read more

About me

I am a 55 year old computer programmer with 35 years experience as a systems programmer. During that time, I have programmed in over 40 languages professionally.

In the Air Force, I was a ICBM mechanic as a civilian, I started out as an electronics engineer but was so distracted by the idea of programming that I took it up full time. Consequently, I have been able to strattle the fence, one foot in software, the other in hardware. Nowhere has this been more beneficial than in the robotics world.

Dagu's Ultrasonic Sensor testing

I've made some testing with the ultrasonic sensor from Dagu. Tests were made on the platform the sensor is build for, the Asuro. The sensor works pretty well, most of the the time. The range of obstacle detection is from 0..25cm. Sometimes the sensor dismiss an obstacle, when the objects is not directly in front of the robot.

 The video gives some impressions, how this sensor works.

Remote controls an Arduino/ PICAXE board connected to a computer by another computer using a wirelles network
I've tried to do this a while ago and I've had some problems finding documentation about this, so here is a quick and simple tutorial. First of all you'll have to … Read more

Other robot builder communities

When we started this LMR-thing, there where not really that many robot-builder communities. Now I see them pop up, I just discovered the one that I will post below as a comment to this.

Apparently LMR is still the worlds biggest of it's kind, according to different websites that compare traffic, google-ranking etc.

So, I think it is in place to spread a little of our love, get the other guys some visits!

Shift Registers with Arduino

On this page there is a tutorial for using shift registers with arduino http://www.arduino.cc/en/Tutorial/ShiftOut

The person has attached two shift registers togther by plugging one into the arduino and the second is getting serial from the first register. Would it be possible to attach same 10 shift registers in this way? Would it be slow or inaccurate? Would the code be over complecated? Would there be to much current draw?

Any help is good


Price: $0.65 USD

 Collected by 3 members
Do you have the undeniable urge to plaster your love for Lets Make Robots on everything you see? We might just have what you're looking for... Read more
  Suitable for ASURO kits and any other kits   Part list: Read more
It's been a long time coming but Mr. Tidy is finally here! He is Arduino compatible using the ATmega1280 MCU and can be programmed via the pre-loaded Arduino … Read more

Xbee Live Conference

Call for conference guests

Who is interested in the upcoming Skype Conference on the advanced features of Xbees? The conference will be broadcast as a special live episode of the video (help-) show.

We are looking for a suitable and practical time slot. Hopefully some time this weekend. Can I hear some suggestions?

DAGU will now stock polymorph and can offer you 1Kg for $22 USD. Admittedly shipping cost will increase that price but if you are ordering several other parts from … Read more
BJ is based on the Parallax Stingray robot. I ordered the chassis before I went on vacation. Since I just got back, I hope to build it this weekend. I am planning … Read more
Price: $99.5 USD

 Collected by 2 members
This tidy little 1 row x 8 element thermopile sensor reads the temperature across a 41 degree sweep. And it can control a servo to automatically pan and create it's … Read more
When Flexed or Squashed alters its Resistance
 Here are some ideas on how to make Resistance/Force Sensors - I thought them up while ago to use as antenne - Insect Feeler like sensors. (sticking out of the … Read more

DC motor control with Arduino

Ok, so i had this running just a few days ago, but then when i tried to assamble it didnt work out for me. Now I cant even get this simple DC motor running from the arduino, or to be more precise; the motor will run at a very low speed. Connecting it directly to my two 1.5 batteries it will run at full speed, but when trying to control it from the Arduino it wont work for me.

 Here is my setup:


and the code is dead simple: 

Arduino bump switches

I Have my very first robot posted on LMR and he's pretty cool except whet he gets a blind spot on his Parallax PING)) sensors and hits a wall, burning the motors and wheels. I'm really really naive when it comes to programing, i know only how to understand programs people have written before for arduino. I do know tons about non- programmed electronics, though. I want to add something like bump switches to my code. I don't know how! assistance requested. My robot is Makerson and he's new on the front page of robots.

Hi, This is my first post to this forum, maybe time to let you see my robotic project. Five months ago i planned to make a two wheeled balancing platform. I wanted … Read more
It is teleoperated from the surface while it goes under water
Using a
Here is an ROV built for the National Underwater Robotics Challenge. This video clip shows the mission and then shows one of the teams, Carl hayden High School, … Read more
Navigate around via sensors and home alarm system
Using a
Hi ALL!!! I'm from Ukraine, and this is my big project "NONAME" .  Why "NONAME"... I don't know :) Some people  give he name WALL-E , but they wrong... It's … Read more
Hello LMR! I am a Mechatronics Engineering student in Canada. This is one of my current projects - IMP. He is the result of the voices in my head exchanging cookie … Read more

Two +V and 0V

On the Picaxe-40x2, there are two pins for +V and 0V. Am I supposed to conect both of them? What are they for?

Free Range Robots (IR Beacon) **UPDATED**

**Update 4.14.09***

OK, when you watch the video... 

First of all, it is like, 5 minutes -sorry. There is a point though promise, and that point starts at about 3:40 or so. Now, I can't stress enough, the code is wicked chunky as it was written in about 10 min. It is all "bang-bang" and not proportional at all. The final code should be about 10x faster, much more accurate with a lot less trial and error. For now, this is just proof of concept and indeed it has been proven. 


Answers beginner questions on how to post pictures on LMR.
I see a lot of questions on the forums sometimes where a member asks the person to post a picture, and the person doesn't know how to do it. Well, here's how to do … Read more
Interpretes Logo commands coded by black and white boxes on paper strip. Draws accordingly :D
Using a
Hi, everybody! I'm back with my new robot - LogoTurtleBot. Read more

CtC's Aurdino Journey

So I am in the Arduino water and have started to swim. I found a cheap off-brand Wii Nunchuk controller, made a PCB adapter for the plug and have it playing nice with my Duemilanove. I have also taken all the numbers coming from the nunchuk and converted them all to nice clean 0-255 ints. From there, I coded a serial receive loop so the whole unit could be used as a stand-alone plug-in to other devices. Basically, the chip just sits there and waits for a single character followed by a CR. I.e.

Error Correction - how can i do it

As part of my "Depron Project", i have made a XBee pro RF transmitter and receiver interface.

(it works very well, however my application will test it to its limits i guess......)

I would like the data to be 100% true. (else my 400gramme areoplane will just be a dot on the horizon - if you know what i mean)

My Question :- I have heard of error correction codes and would like to know what is the best way or method to follow ?.

My system is Arduino based ie Atmega328s.

My data string is so :-

Control a Servo with a Ping Sensor in about 5 minutes
Using a
When I did the Web Clicker, I picked up a copy of ViewPort for debugging and it was a lifesaver.  ViewPort was designed by Hanno Sander.  He also developed an … Read more

Schottky diode bridge IC for L298N?

Hi all!

Noob question: I'm using the L298N dual full H-bridge to drive my robot's 4 motors, can someone please give me the name of a chip that contains schottky diodes in a bridge configuration, so I can use it on the outputs to block back EMF? Sparkfun does the same on their boards: http://www.sparkfun.com/datasheets/Robotics/ROB-09571-Serial%20Controlled%20Dual%20Motor%20Driver%20-%20v11.pdf

I know that there are such ICs since I recall a friend using a 16-pin DIP in a similar occasion, but I can't remember it's name. I think it started with "L".