Let's Make Robots!

Recently Collected Posts

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".

Smile, Mr Robot :)

As written earlier here in my blog, I am trying to make a robot that will take snapshots of itself.

I have made some laser guiding system (I think), and some cool docking so it can hook up a trailer with a camera on.

However, I figured that if the robot is taking pictures of itself, it should be able to smile to the camera :)

Navigate around via ultrasound, avoid some obstacles, play Monty Python tunes
Using a
Meet Head, the big headed robot. Head's life is really simple being just joy and play. Well, for now at least. That may change in (near) future if I manage to get … Read more

problems with L293D + Arduino

I wired up a L293D to my arduino, planning to run 2 motors with it, and just for testing I runned the blinkie program on it changing the LEDpin to the to the digital pin that goes to the l293d but only half of the pin works, like it turns in only one direction. Is it normal ?

 

It's 4 in the morning so I did not do a lot of trouble shooting, just changed the pins that were on PWM to digital, it didn't changed anything.

Live soccer robots on LMR

Recently Gareth suggested to me that it would be good to have 2 teams of my bi-ped robots playing soccer. This was too good an idea to ignore.

After talking about this idea backstage this is where we are at:

Well this is GPSRover 1.0. its not my first robot but it is my first on LMR.     So far all it does is move between different saved waypoints but im thinking of … Read more
this is my first mono core bot.it is still in debugging.the front leg have modified and add spring.i will take some video later.  the source of … Read more
Allows you to send IR / remote codes in "background"
Hello guys. After hours spent on the internet trying to understand how stuff works i came up with this piece of code. It simply sends out SONY remote codes, but the … Read more

Lets Make Robots toolkit or something

I've been looking on forum and saw something as LMRtoolkit... there are a bunch of programs out on the forum and something else... why just we make such a menu and there people can download there apropiate needing program. I made a Speed/RPM/wheel calculator and a bluetooth controller via virtual port and etc... why just we collect them into a single place or just pack it in a so named "Lets Make Robots toolkit"? I think this is a good ideea...

 

    So what do you think?

Navigates remote controled by another computer
Using a
  Hi there!   After seeing the tank tracks that amando96 did for his AATV, me and Purdom decided to build our own tank. We've started building it last Saturday … Read more
A more powerful and versatile AVR library
Hey guys, I wanted to bring a video tutorial I created to the attention of LMR. The video is a walkthrough on how to use a software tool to setup a project using … Read more
Stimulating the right part of my brain
Using a
Aye! Since every recruit goes through initiation I just ordered the START HERE kit from picaxe (well most of the parts). Cool!   And then I got hands on a stash of … Read more
This one is a copy of the floid robot but made with aluminium . for more details you can see on the original floid robot post . I can only provide you with some … Read more
light seeking,chaos,basking,move over Obstacle
the turbot v2 is heavy duty building.it has a name,WANG. the vidoe show WANG's moving under sun and under manmade light.         Read more
This is BRC, a line following and obstacles avoiding robot made for the Beginners robot chassis challenge.   Parts used: Read more

MOSFET vs BJT

Hi guys. I have to admit i do not know much about these kinds of transistors... i mean, their difference.

I have to get a large current pass through a wire, but after having read articles on wikipedia about mosfet i don't really know why i see them on, say, motor drivers instead of BJT transistors. One thing i don't know about is whether you can find logic-level high-power BJTs but i know there are logic-level FETs, like the IRLD series. But again, if you want to switch a BJT on fully then maybe you could just arrange them into a Darlington i guess.

light seeking,chaos,against obstacle
Using a
the beam ant v1 is a bare bone version.I use very sensitive photo diodes to make the bridge.it show some unbelievable behaviors. the v2 is a heavy duty … Read more
Follows a line and avoid obstacles, Make sound with a piezo speaker
Using a
This is my entry for the DAGU "Beginners Robot Chassis Challenge". It is prelimary named Pacman, but the name maybe change in the future. Pacman was my first idea, … Read more