Let's Make Robots!

RF link TX/RX 434 MHz = lessons learned and then some

I'm trying to build some sort of RC transmitter using the 434 MHz radio link set. Sometimes called Easy Radio, but not by SparkFun. Edit: because they're not the same thing!

I am setting this up on a breadboard with a Picaxe 08M and two potmeters as inputs. The two ADC bytes are combined into one byte. The one byte gets transmitted.

RC plane Project Part 11 - XBee Pro Field/Range Test

RC plane Project Part 11 - XBee Pro Field/Range Test

(NonStream Link) XBee Pro Field/Range Test 

At last i have done some field tests with the Xbees ..........

...... I have been jumping/running around my local flying field .......

..... even on the lowest power setting i was able to Rx a good clean signal....

Watch out for falling balls

I was looking at Pat's Chess bot post and noticed the link to the bearings he is using for his slides....

As a PSA, I thought you should all be warned:

Robot family picture

This is my complete robot family. 24 robots so far. Build over the last 15 years. Some of them are dead or incomplete. But most of them works.

A higher resolution image can be found in my flickr album, including tags of every single robot.

 

 

 

Polymorphing a Webcam

Today I decided that my Logitech QuickCam Communicate STX webcam needs upgrades. I got the camera, some polymorph, plumber's tape, hot glue and couple of servos. Let's see what we get when we put those together.

Ooops! I forgot to take a picture of the original camera. If you have never seen a Logitech QuickCam Communicate STX webcam there's some pictures of it at least here. There's might be some pics at Logitech site too but since this is a discontinued model they could be hard to find.

RC plane Project Part 10.5 - Frustration www.letsmakerobots.com (Gareth)

Frustration and delays.

"Red Box" firm are still messing around with my replacement XBee - GRRRRRRRRRR - means they are walking a thin line with me now..

Edit :- Red Box firm needed many emails before they sent replacement (thier tech support sucks - however thier admin rocks)


Anyways :- good news is i have fabricated the RX/TX circuit boards - Bare bone-ish style.

Deprons Transmit Module :-

"Dremel,Dremel............."

100% up to date on everything

Frits made a big deal in the shout box today after I posted that I had caught up with ALL the forum posts. He suggested I make a blog about it, so here you go, Frits!

There was a little "easter egg" suprise message that comes up when you have no unread posts.

IR phototansistors, sensitivity and RC time constant

Some time ago I had a great idea: I'm going to make two robots. One will be an obstacle avoider and its job will be just wander around with its big head. The other bot will then try to catch it and hit the head with a hammer. Tracking would be done with infrared leds and phototransistors. For the time being I've pretty much completed the first part and posted Head. Head already has infrared leds on its head so next thing would be building an infrared tracker.

Chess robot operation via ustream

The chess robot is now up and running via ustream (this doesnt mean its live yet, just that it works). So here is how it goes:

First of all, here is the ustream channel it will be on http://www.ustream.tv/channel/patrickmccb

The commands are as follows:

To move a piece type in the location of the piece, type dash, then type where you want to move it, then the word "move".

Example is: b7-b6 move     

MyLaunchPad

 

This is my blog on the TI LaunchPad. A new platform for me to experiment with.

Note: The structure of this blog itself is a bit of an experiment. I will make posts to the forums with 'MyLaunchPad' in the tags, and include links to my posts in this blog. So the blog will be a collection of links to forum posts.

DarwinBot now in Soccer mode

My DarwinBot has been reincarnated into erhhmmm something completely else.

As it is right now (if it is indeed live at all) you get to control it. It is very very simple. Just five little commands. To get control, you must use the magic word first: control (and hit send). Now you have a limited amount of time to control the bot.

The available commands are:

Question - Rev counter

For this project here http://letsmakerobots.com/node/22474, I am needing a simple sensor to indicate the number of revolutions a tsecond that an axle makes.  However this will be in a dirty/oily place (under isde of carriage bogie) so I am wondering on the best method of sensor to use.  I think I have narrowed it down to three possibilites -

1/ Optical slot interupter with seperate encoding wheel.  Probably easiest option but how prone to dirt and mis reading.  Could be hard to clean.

Mystery Secret - Late Summer Object Quiz

Here is a Late Summer Mystery Secret for you to ponder over.

Any Guesses however obscure welcome.

So what is it ?

How can it be used ?

Can any "Metal Can" transistor be used (this is a very important Question) ?

Which famous Film is the music at the end from ?

And why did i not i think of this before ?

Rho

04.09.2010
i got the 3pi robot from my friend for yet unspecified time :) so i plan to play with it a bit, put some more sensors on top and as it is usual with my projects make it able to follow line with obstacles course as well as navigate maze. i had to come with some name though and as it will be slightly altered kit i decided to go for the next letter in greek alphabet - Rho.

Video Goggles

Presented here is a video goggle system assembled from commercial, off-the-shelf (COTS) components.  The system can be made from recycled materials for under $100.

RC plane Project Part 10 - Wii-Nunchuk Experiment www.letsmakerobots.com (Gareth)

RC plane Project Part 10 - Wii-Nunchuk Experiment

NonStream Wii_Nunchuk Experiment

With all the recent talk with regards to the Wii_Nunchuk ..... and somewhere in a post someone dared me to attach a Wii-Nunchuk to Depron, i thought that at least i should give it a whirl to see how it felt.

Findings :-

I know that its still in "Dry-Hanger" at the moment but from my feelings the Nunchuck would only be of any use for the Ailerons.

µBotino - 2"sq board for robotics, Arduino compatible

After playing with the Robot Builder's Shield, I've decided to make a small robot board that has the same features as the shield. I wanted it to be 2"x2" (5x5cm) so it can be fabricated cheap and to be appealing to many robot builders that still build small robots.

I present the µBotino robot controller. Features: 

GPS failed checksum

Well first of all Hi everyone, although i've been visiting the site for a while this is my first post on LMR so here goes.

After seeing patrickmccabe's "Fundamentals of a GPS guided vehicle" tutorial i decided to give it a go. I got the code supplied in the tutorial to work without any trouble but when i started making some changes and adding to the code i ran into a few problems.

What to do with the big motor driver?

2.9.2010, past midnight

Lots of Ideas have been flying trough my mind since I got the motor driver ready.

(http://letsmakerobots.com/node/22363)

I am now thinking of making something like this, only a bit bigger.

Arduino Shield for building robots

I've been asked by a few people from different places if there is a simple way to use an Arduino to build robots. I explained there are ready made boards like Roboduino, Romeo, Motoruino, etc. that can be used. Or a custom compatible board. I told them that I went both ways, mostly because Roboduino doesn't have an H-bridge onboard, so I designed my own customizable board, R-Dev-Ino. Usually people are puzzled with all that information, as they have heard about Arduino, some have used it in art projects or so, but did not hear about the other variants. Seems complicated...