Let's Make Robots!

How to change the robot direction in Picaxe

Hello everyone ,

                I am new to picaxe , i am making a two and a three whell robot , i am stuck in a problem of rotating the robot body to other directions using picaxe commands . I need some help .

Hair dryer components not dangerous?

I've recycled the nichrome wire/element from a couple hair dryers and hot hair curler station for use in a 3d printer project.  All of the houshd items have an unusual heat proof material supporting the heater wire.  It is very thin,  almost feels like a stiff cardboard, but doesn't have any layers and light can be seen through it. Has a silver, mother-of-pearl type finish.

  It doesn't seem to burn since it holds red hot nichrome wire. I just want to make sure it is not asbestos or something.  Does anyone know what it is?



Simple servo bracket

Birdmun an Hi jinx got me looking into open scad, he is code a bracket for a servo you can adjust just by playing with a few numbers, the software is free and there's some tutoreals on line and youtube, you can export STL's as well. I did not think I would like it but after playing with it, my mind is more open, for simple shapes it is very fast.


Servo Bracket p, li { white-space: pre-wrap; }



A new cheap 2D Robotic Obstacle Detector

It allows your robot to determine the distance to obstacles and walls and to avoid them.

Here are some parameters:

* detectable range: 20 cm to 150 cm (6 to 60 inches )

* 7.5 degrees angular resolution

* 2 scans per second

* 180 degrees view

* easy interface with other boards it comes pre calibrated

* USB interface power and data  Rs232  and SPI

It is intended more for terrestrial robots (is a bit slower than the laser rangefinders) 

Here is the link :

Servo problems!

I'm having a lot of problems with the servos I'm using to build a quadruped robot. I should start by mentioning that I bought the servos from Dagu like 4 years ago, BUT most of them had never even been unpacked until recently.

The problems are the following:

Is an Arduino Capable of Reading All Four Rover 5 Quadrature Encoders?

Note: Sorry this post is so long. I used bold text to indicate the main point of the post.

I didn't want to hijack Oddbot's Rover 5 threadso I'm starting this one here in the forum.

In replying to odong's question about the quadrature encoders I stated (among other things):

Which voltage regulator to use?

Hello all,

For my project, I intend to use a 3.7V LiPo, 4400mAh for my datalogger. 

With my Arduino Pro Mini comes the MIC5205 LDO regulator which I'm using now but I intend to build my own PCB and am looking into other regulators / buck-boost converters.

Which ones would you recommend? I'm very new into this so any help is appreciated.

What to get with my Dangerous Prototypes Free Coupon?

Over a month ago I won a coupon for a free PCB from Dangerous Prototypes. They give a chance to win a free PCB coupon three times a week on their blog page, on Facebook and on Twitter. Once in a while I make a random comment to try to win, and finally I did.

Now what the heck should I buy? I'm really having a hard time deciding.

Top picks so far are:

adopted a h bridge here and facing issues

Hi all,

ages ago I found oddbots cool h-bridge on this page which works quite well. I started with 100x160mm boards and made two boards for two bridges in order to controll 2x2 motors.

A few weeks ago I got into contact with the pcb-tool Eagle and gave it a try to place two h bridges on one board 100x80mm (freeware edition).

As far as I can see I just copied the bridges. The only think that differs from the two-board version is, that I used the same power/gnd traces for both bridges.