Let's Make Robots!


The Pulse - 2009w21

LMR on the Brain
Sensing the living LMR community since 2008w43.

Famous last words

Some of the most promising of LMR projects withered into oblivion with these memorable closing statements. A short selection from the LMR video archives:

Laser Tag Project

Hi guys.

I thought that the best thing to do to save all my progress so far about Laser Tag was to write a page in the blog, so here i am!

This first entry only deals with the various possible setups i might use for this project, i haven't made up my mind yet. I'll start by listing the most probable ones.


SETUP 1 (voodoobot)


-3 SERIN MCUs at the top, each one runs the SERIN command and as soon as they get something they tell that to the master.

START: first robot


I would like to buy my parts as soon as possible, but would you like to check if i haven't forgot anything ?

I would buy

- 1 sharp IR sensor
- Tamiya Dual motor gearbox
- Tamiya tracks


- picaxe starterpack
-l293d motordriver
-picaxe servo upgrade pack


 Greetz Laurens


So I have this laser tube lying around and I was wondering how to use it. It is a Helium-Neon (HE-NE) gas laser tube built by Uniphase.



horrible picture, just like most of mine


It's description is very vague, I'll read you the label.

(clears throat)






 S/N 183475


Buying the same is so cosy!

Just my 5 cents:

It should come as no surprise that I am really happy that DAGU has chosen to be friends of LMR. It has a lot of advantages!

However, it also broght something new and unexpected with it; We are all (50 of us) getting the same toy! 

I dont know, I just think it is so cosy, in the need of a better word. So I had to write a blog entry about it.

And then we all had the same problems, and we all had the same talks with Claudia from DAGU, and we all thought she is so nice, and we all got a free mouse, that we all..


Gift for LMR Mr.Basic Buyers

Sounds everybody is waiting for my good news.


But firstly I want to s

Price and function, which Pic axe?

Well its a bit late in the year, but i have started our schools first robotics club and have attracted a suprising large crowd. I intend to show them them basic concepts, much of which are covered here, with the final project being the start here bot (final planned project).

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.

Japanese vending machine

You just got to love the Japanese vending machines!

Back home, the vending machines just pushes down the goodies when you order someting, here a robotic arm picks up a little tray, gently moves it to the opening, and waits there for you to pick it up. Then it parks the little plasic tray. First time I saw itm I could´nt beleve my eyes!!!

Any robotics enthusiast just have to love it!!!


New robot in the making

My Mr basic is almost completely assembled now. As many of us, I ran into difficulty with the axles of the front wheels.




2 more draw slides to use for the Y axis purchased from here. High quality slides with ball bearing inserts. Still have to work out how I want to mount them. They were only $15 each.. money well spent now that I can see them close up.






This is a fully functional version of the Arduino. We eliminated the PCB and use paper and cardboard as support and the result is.. the PAPERduino :D

This is the the first version of the layout design, next we will try more designs, and another materials.

You just need to print the top and the bottom layout, and glue them to any kind of support you want. We hope that you start making your own boards. If you do, please share your photos with us, we would love to see them  ;)

See the Swedish Mastership in Robotics live!

Hey everybody just want to tell you that the Swedish Master Ship in robotics is currently being held in Gothenburg.

And it is all sent live on this page



They are competing in:

Mini sumo, robots that are max 10cm X 10cm and weight max 0,5 kg.

Standard Sumor, robots that are max 20cm x 20cm and max weight  3kg.

Almost a robot page worth


My Theo Jansen Walker is getting closer and closer to a robot-project-page-worthy machine/creature. The port side is now complete but not finished.

Complete in the sense that I have all components designed, purchaged, built and even assembled. Not finished in the sense that it will not move! Hence the lack of video. Photographs will have to do.


Qwerk control with processing

So I was doubly inspired by Chris the Carpenter's recent experiments with robot control via processing, and f5pql's heavily-equipped qwerk-based robot to do some more tinkering of my own. I'd been programming the qwerk for autonomous operation through the SimpleRobotClient, and controlling it directly through the telepresence DiffDrive client, but was beginning to wish I could somehow construct a hybrid of the two. But building a client from scratch - or even just tweaking the existing ones - looked scary!

Choice of servo

Im part of a group designing a quadruped robot. We require servos on the leg for one for vertical and one for horizontal movement. We undergone torque calculations for the robot to remain stationary which eg. calculated at 3.75 kg/cm. We looked at torque specifications on the servos and it gives you stall torque for hitec servos. I am unsure for what range of torque for the servo to select. Eg like 3.75 kg/cm for 5 volt supply what torque from the servo specifications must be selected? Please help me out. Also what model of the hitec servo must I choose. Not really worried about speed.

Schematic for IR sensors and Ultrasonic range finder

How to you connect a Ir sensor and Ultrasonic range finder to a 28x1 picaxe microcontroller?

Schematic help on picaxe

We are trying to make our first custom board and were wondering when connecting a servo what pin the black wire connects to on a 28x1 picaxe microcontroler? Thanks

Arduino servo twitching

Servo twitching. I know, simple stuff, but it's interesting to play with on new hardware. Another Arduino example "sketch" (they got a number of these) called Sweep simply moves a servo through a set range, back and forth. Just looking at the sketch (listed at bottom) this timeshows a servo controlsignla connected to pin 9. They recommend using the boards 5 volts to power the servo, which is coming from the USB connection. If I'd had a bigger servo, or was under load, it might be appraoching the 500 mA USB limit (or is it more now?).

My first working custom board

Its been a long night, and after suffering several burns from soldering to testing, i have a finished product. Its only a small project but it was a huge step for me because i always aimed at creating my own board and this is the first.

Right now it has 3 Battery inputs connected in parallel, (thanks robologist/ jklug) hooked up to Oddbots 5V regulator schem with one output in the form of those battery screw thingies whose name i forgot at the moment. The best part is that it works :D. See you guys around.

Robots, dogs, and tortillia

Hello again.  I'm starting to feel a bit shameful.  I hope I am not posting too many videos.  Is this OK?

Ok.  So, I'm doing all this on the fly.  I'm sorry I haven't posted anything about the hardware or the software I'm using.  I'm still creating the software to control my robotic arms with phidgets.  I'm having alot of fun with it too.

Power Board

alright well i was working on the power regulator for my new board and i had 4 AA's hooked up like nobodys business, and im getting a steady 4.24V. The AA's themselves are not fully charged and are 5.07V combined. I want to add two additional AA bats, using the original 28x1 board case (normally 3 slotted) with a jumper, im not sure if this makes a difference but ill mention it. When i tried adding the other two i smelled a burning smell and then burnt my finger on one of the springs, the V while this was happening dropped to .8V or something.

Blinking an LED in about 5 to 10 minutes

Earlier today got a FedEx delivery of a MakerShed order placed last week. Toys!


 One particular toy was a new Arduino Duemilanove. Had to see what made the Arduino popular.


Edwards circuit board

I got some questions from Adobi123 on the design of the board I built for Edward. I dont have any schematics cause it was done on the fly by laying the components on the board and trying out which locations would fit best. Anyway; I made a description of the components I used and I'll link some of them to relevant pages with documentation.

The board

ubuntu & atmega

So my pickit2 kept failing, even with only pic in circiut. FinallyI got fed up of pics and windows. I deleted windows, moved to ubuntu, took out mu usbasp and atmega88. Tried to get pickit analyser (like computer oscilloscope) working on linux but it seems impossible, so I have to use windows computer for that. I also found out that linux + pic programming = big no no.


My UAV ideas

I've been reading this site for the past week or so, and it has really inspired me to get more into robotics. I've had a couple of ideas for robots that I want to make in the future, I am going to start of with fritsl's starting robot, but I just wanted to share some of my future ideas to see what you guys think.

new project: the critter in the terrarium

 the idea is simple

there is a terrarium (a box)

inside the terrrarium there is a critter which lives forever

the terrarium have a refuel station able to recharge critter batteries

1) when the critter is full of energy it lives:

roam the terrarium and interact with enviroment :respond to sounds, make sounds,  blink lights according ecc

it's able to detect environment light level then respect a day/night behaviour cyle

2) when the critter is low battery it head to refuel station and acquire electrical lock with it

A little help with processing code...

alright I started with some sample code and it worked great -- I was able to left and right click on the square and send one of 2bytes via serial to my picaxe board. Here is the sample code:

Robot Fight!

So, Ok.  The SES had a bit of an unfair advantage.  But hey.  The plastic linkage controlling the gripper on the Lynx 6 broke when I over extended the gripper picking up an object.   Why did I take the time to pick up a roll of yellow duct tape during a fight?  Well, the Lynx 6 was already moslty incapacitated, and  I thought the Lynx 6 might need it.    

Always bring a roll of duct tape to a robot fight!  :)

It's all good though.  I have a replacement on order, and the Lynx 6 will come back for round 2! 

bluetooth com and processing language rig

These are the source files related to the setup I mentioned in CTC's post about wireless serial com.


Reposting info on the setup just for ref.

Alrighty, ctc, got the rig working. The setup is the following:

<ir beacon> transmitting byte sequence from 1-9

<relay station> picaxe 8m with ir receiver showing correct data in the debug window.

Transmitting the byte sequence received from ir beacon via bt to my desktop running the processing code.