Let's Make Robots!

picaxe

Problems with i2c (and an LCD display)

So, i just wasted an evening trying to make an LCD with i2c work with my picaxe.

I connected the SCL and SDA of the board to the other end on the LCD. (of course not crossing them :P)  BTW on the picaxe the pins are: Digital input 3 = SCL; Digital input 4 = SDA, am i right ?

If so, other question is: do i need the two pullup resistors ? i've read somewhere that they're already there on the board. But if so, the pin should be high most of the time, shouldn't it ? testing with my voltmeter reads 0V. 

PS i have the picaxe 28x1. 

Testing what one can do with 4W differential drive, and steering by .. erh..
Using a
Update: Just a small new video, nothing really. Just my studies, I use the platform for different testing of stuff. Video and slow motion helps :) While playing … Read more

My First Robot

I thought I'd wait until I'd made my first robot before making my first post.  As you can see below, it's a complete rip-off of the (excellent!) first robot tutorial.  The differences are that I had to tweak the code to make him move forward/left/right properly, and also that mine is a bit more hairy due to an abundance of wires :-)  Not the sleekest of robots, but he'll be cannibalised pretty soon.

first robot

Picaxe + Paypal

Hi!

 

To buy my first robot I'm looking for a Webshop that sells Picaxe starterpacks. Since I do not have a creditcard I need one with PayPal support. I found this one: http://www.robot-italy.com/product_info.php?products_id=721 but that says in very tiny letters that it won't be in stock till 07/10/2008.

 

Can anyone help me? =D

 

B. 

Update: Solarbotics has made this kit, were you will get all the vital parts needed for this project, at the best total price available out there :) Welcome, funky … Read more

Picaxe 18 and Ping

I just picked up a Parallax Ping distance sensor from my local Radio Shack and am trying to figure out to how hook it into my Picaxe 18 project board.

The ping uses a single pin for both input and output.  It first requires a trigger pulse to be sent and then it responds with a variable length pulse that determines the distance.  Can a Picaxe pin be switched from output to input?  If not, can I connect 2 pins to the single Ping pin?  Normally I would jut go ahead and try it, but I don't want to fry my Picaxe or the sensor.

Turn an ordinary (cheap?) RC-car into a Robot Wall Racer
Using a
UPDATE: Code now attached above + Ant has send me some tiny relays, I think they would work in this, and you could make everything 1/4 the size of what I did. Ask … Read more

Serial Terminal help

I'm trying to work out something similar to what fritsl had with his "see what robot sees" post: http://letsmakerobots.com/node/316.

Every time i open the Serial terminal window i get gibberish:

 

what the serial terminal is displaying

Not sure how to use the Picaxe 18x Project board

I just got my Pixaxe 18x starter pack in the mail (YAY http://www.sparkfun.com/commerce/product_info.php?products_id=8326) and the one thing that seems to be lacking is complete documentation. :)

All the output pins seem to go through the darlington driver and the pins coming from it are all negative (-) -- not positive (+).  Usually when you set a pin to "high" it goes positive, right?  This seems to reverse that.  I'm not exactly sure how to connect this to the motor driver or do serial output.   I hope this question makes sense.

Using the axe023

I have a couple of the axe023, and I was wondering about their full potential. Are they compatible with IR sensors? What else besides bumper switches and simple motors can you use them for? It would be fun to make a bunch of little robots.

Which Battery Pack for the PICAXE 8 Pin Proto Kit? (9 volt?)

I just received the PICAXE 8 Pin Proto Kit from Sparkfun (yay) and it comes with what looks like a 9v battery snap clip but the datasheet says that I cannot use a 9v battery.  The text states:

"ONLY USE A 4.5V or 5V battery pack, not a 9V PP3 battery, as the power supply."

So what kind of a 4.5v or 5v battery packs uses the snap type connectors?

Finds the hidden racing track in every room.. and races it!
Using a
This is updated, reason is here   A video in better quality than YouTube & Google is here How to make Robot Wall Racers yourself, see here Read more
I really do not know what it does
Using a
If Google video is down, the videos can be found here: Video 1 Video 2      The I really Do Not Know What It Is Thing! I just had to do this - One day I may … Read more
Gets funky with it's surroundings
Using a
How to make a Yellow Drum MachineAudiofile Engineering asked me to do a sequel to a robot of mine, Yellow Drum Machine. It was named Yellow Drum Machine II (YDM … Read more
This is part III of a series I call “How to build your first robot”.     This part is not so much instructions of how to build & program, that was in Part … Read more
(JKA is working on something more fancy than this, an applet for download)   If you are using Picaxe, I am sure you know, use, and appreciate the function … Read more
This is Part II of How to build your first robot - tutorial. you can just take the cool navigation-code in here and have fun with it, or you can follow the whole … Read more

Where to buy Picaxe?

There seam to be an echo of "where do I buy Picaxe", especially from newbees from the US.

Well - let´s make some web-shops happy out there, I entered picaxe.co.uk (http://www.rev-ed.co.uk/picaxe/), looked under "distributors" and found this most likely not too recently updated list:

International Distributors/Resellers

Blocks use the { and } charcaters to create collapsable code! In the Options menu of the Picaxe-editor, check "Use Collapsing blocks" in the "editor" - tab. Then … Read more
Line following for DTU Robocup
Using a
Out of pure frustration with the fact that my LEGO MINDSTORMS NXT based robot, that was supposed to participate in DTU robocup, turned out to be crap, I thought … Read more

Simple test with PICAXE and a monster truck

Just tried out controlling my radio controlled monster truck with the picaxe. It's a simple test run of forward, turn left then right and then stop. I put the car in a spot that almost made it reach the bathroom :-). Notice how the breadboard almost flies off when the car turns... a really solid construction! :-)

bonzer_monster.jpg

I'm looking forward to making something useful out of this car... it can go pretty fast!

Dang! I can't seem to embed video in a blog post???

36 KHz modulated infrared light detector

I have started working on a new robot that is mainly based on LEGO MINDSTORMS NXT. This robot is aimed at participating in DTU robocup 2008 but time will tell if it will be finished in time. Anyway in robocup the robot must at least be good at following a black line and preferably it should be able to accomplish other of the tasks at hand as well, and this is just not feasible using the standard LEGO sensors and the very limited number of these it can use at one time.

On Picaxe: sound 1, (110,3) is NOT a good idea, you should allways write sound 1, (110,3) low 1 (you do not need line breaks, just write it as above)   Being used … Read more
Drives around and finds stuff to play drums on. Samples what it plays, and play to the samples.
Using a
How to make a Yellow Drum Machine    Audiofile Engineering asked me to make a robot like this for them, to be won in a promotional contest. Yellow Drum Machine II … Read more
Shows how far you can get with very few and cheap materials
Using a
If the Google video is not working, please see the video here I proudly present part II of the "Little 8"-project!All I did was actually to cut the bumper's wire, … Read more
Allways a board to fit your needs :)  http://194.201.138.187/epages/Store.storefront/?ObjectPath=/Shops/Store.TechSupplies/Categories/PICAXE/PICAXEProjectBoards Read more
Very cheap but fun little beginners robot. It think' it has a brains within a Picaxe 8
Using a
Edit: Check out this nice clone: http://letsmakerobots.com/node/8386 From building big, nasty, with large shovel, 2 cores, multiple sensors, soundsystem etc, I got … Read more

Arduino vs Picaxe

Should I go for Arduino or Picaxe for my next robot?

(EDIT: Please note that this is a very old post, things have changed :)


Please note: The info on this page is about a board. However, things can be different depending on which chips you stick into the sockets of that board, and how … Read more