Let's Make Robots!


Rudimentary LDR eye

Old idea rekindled

This idea about very basic robot vision haunted me ever since I first saw AmandaLDR. Even before it was named after a canine. It's somewhat inspired by the evolution of the first eyes in nature: just a bunch of light sensitive cells on your rump.

Cant get Freeduino to work with Vista

Ive checked my soldering, ive installed all drivers and have it hooked up correctly but for some reason I cant get my freeduino to work with vista. Everytime I try to upload code I get these errors --

    avrdude: stk500_getsync(): not in sync: resp=0x00

    avrdude: stk500_disable(): protocol error, expect+0x14, resp=0x51

does anyone know what these mean? (Freeduino is same as Arduino Decimilia)

Phidget Servo Controls - 2

Am I blogging correctly?  I'm still a little new and a bit confused.  Sorry if I might seem to be spamming?

This is a video of my two controls working together. 

I still have a lot thoughts of how I'm actually going to present a final GUI and functionality, so this is just a starting point. Keep in mind, these are two separate controls. My intentions are to allow people to use my phidget servo control individually and/or use the IK control individually or, both at the same time, with as little code as possible.

new project: 3 servo exapod

i want top build my 3 servo exapod like this one  


it have to be half in size




i will try to use polymorph for legs and body

working in progress...

This was my first, now i'm working to upgrade it )))

Thank you guys. Your advices were very helpful.

And now for something completely different!

** Update **

I delivered the gun to KJ precision engineering for testing. It has been named "Soldestroyer" by my former boss.


Polymorph ?!




uh  It could work as a neural network....











Torque calculation

I would like to know how to calculate torque on three degree of freedom leg. Example like a Phoenix type robot design. At least show me the calculations that would make my life easier. Thanx

Hi, I'm still here!

I bet you're all wondering, "hey, why isn't Zanth around posting bots anymore?"

Well, truth be told, I haven't touched my projects since graduation. Searching madly for a job has taken precedence over everything else. Now that I have a job (!) I decided it would be great to get back into things.

The Pulse - 2009w14

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


My first robot

This is a work in progress I shall be embarking on with a friend of mine. As first robot we are doing the robot from Fritsl's tutorial on 'your first robot' Yes, the picture at the moment is just the parts, unpacked as this is the stat of the robot presently, haha.

Theo Jansen style robot leg: prototype #10: forget about brass!

Getting closer and closer. Today I needed to clear my head. I really were dreading mass producing my legs with all those brass pivots. During a nice walk in the sun, I figured I would try 10 mm beech smooth dowel rod.

[This photo links to my Flickr set with many more details.]




My StartHere references

For future reference, and my own convinience, I'm posting all the links that are nice to have available when trying to make a StartHere-bot with a SRF05 quickly.

Start here (the test program should be servo 0,150 <enter> pause 500 <enter>)

Start here 2

Picaxe 28x1 guide

connecting the SRF05

USB Picaxe cable installation 

Failures and Lessons In Robotics

Trying to play catch up and getting a bit discouraged with my phidget servo control.  I'm starting to wonder If i can work with my boebot and have better results for the fun factor. Still,  I'm going to try and move forward on this project and hope I see some real progress here soon.

First video: 

Hey, Frits. I'm Dan..

Lol, when seaching the web for something else, I just stumbled across an old posting of mine. Below it, I found a historical start in a comment:

"Hey, Frits. I'm Dan.."

"Historical".. why, you may ask  :)

Well, I made up the original LMR, and today Dan is hosting it & programming extensions etc, and this very post was where we met, aparently :D I completely forgot, but now know why he later was going on about me and Arduino ;P

The Internet is a wonderful place! http://letsmakerobots.com/node/80#comment-351

You MUST hear this!!!

I was over at Boing Boing and saw this post. A man was qouted over and over .002 cents per K of data on his phone. He used about 30,000 K and was charged $76. After talking to 3 or 4 different people, he could not convey the idea that .002 dollars was different than .002 cents. The recording of the call is included, which must go on for like, 20 min. -not trying to explain the mistake, but just trying to explain basic high-school math!!!

GPS - The Complete Guide - Arduino based Global Positioning System

GPS:- The Complete Guide to Global Positioning Systems.

Updated Here :- Arduino based Global Positioning System

How they Work and How to interface them into your Robot.

Does your Robot need to fix its absolute Position - Speed - Heading - Time - Date & Altitude.

Here is a Guide to explain the Process.


duracell-2 is base on fritsl designs, and i was hoping that the robot could be a track-bot from land target of inside and outside. The robot that i made has over items which might be expensive. here are the supplies.

  • ultra sonic range finder
  • 2 vehicle chassis kit
  • PICAXE servo upgrade pack
  • PICAXE-28x1 starter pack
  • l293d motor driver

these are the supplies that u could get it at any places ^_^

Phidget Internet Lamp

So here we go.  First time participating here on letsmakerobots.com

This is a module I created in C# using TCP Sockets, SQL server, a web page, and my local home PC.


There are four parts to this application:

No need for oscilloscope, nut cracked, bright debugging ahead!


I do not have an oscilloscope, and I "always" wanted one. "So I could debug & understand & see what was going on".

Yesterday I got so frustrated that my cheap RF still was not 100% rock solid - even though I had made all sorts of initializing strings.

i got so desperate that I decided to buy a used oscilloscope. While checking out what was on sale in my area, I got the idea that perhaps I could make one myself..

That got me to look into .. "perhaps someone out there made a SW oscilloscope - how hard could that be?

Death of a tripod, a polymorph tragedy :(

This was my camera tripod used for videoing my robots at ground level.


After videoing Turbo Trike I left it in the car by mistake. I forgot all about it. After the car being in the hot sun for nearly a week, I found my tripod like this............


always remove the batteries before recharging

Another lesson was learned, I never thought this plastic could crack with the heat caused by the reacharging process.. but it did..  :-)
Now I know, batteries get hot when being recharged, and the heat can damage the robots components


Quadruped robot

I am doing a project on a simple walking robot. It has 2 have a variable constraint mechanism. Do any of you guys can give ideas for my project with design ideas. Thanx

Howsit people. The design that we trying to consider is a hyperion type design. I have attached pics of a similar design. Could your'll please tell me how the driving mechanism for this robot works with its walking pattern. We are having problems figuring out the driving mechanism. Our task for the project is to make the robot go over an obstacle.


Auto-Level-Balance Controller (Wii-Nunchuk Arduino)

Here is an interface that uses the cheap Wii-Nunchuk controller to create an Automatic Level-Balance Controller.

Not sure what to use it for - maybe a mount for a camera based bot - or some form of weight distribution system.

The system work quite fast and always regains its self to a level - in balance - equilibrium....

Any Bright Ideas would be welcome............


Not-so-mighty bot

So the Mighty Bot challenge (http://letsmakerobots.com/node/4979) got me wondering about the mechanical performance of my Qwerkbot project. It's not been optimised in any way for the task, and has no hope of winning, but maybe it's interesting for comparative purposes!

Qwerkbot weighs in at around 3lbs and is powered by a 7.2V racing pack. In the video it slowly shoves a pot of potatoes (total weight 3.5lb) the requisite metre- conveniently all the flat workspace I could find!


This afternoon got off to an auspicious start.  The problems I was having loading AXEpad onto my Mac seemed to have had disappeared since Thursday.  An hour later, I had the USB successfully loaded.  (For Mac users wondering how this is done, make sure you read the USB Setup section of the Picaxe manual.  One thing the manual neglects to tell you is that you have to also download a piece of software called a serial driver, which you can get for free from FTDI.com or from Rev-Ed's website.