Let's Make Robots!

PWM with l293/l298

I hit a wall when I was trying to use PWM on the enable pins of both l293 and l298. Whatever  PWM frequency I choose it seems that I loose a lot of torque on the l293/l298 outputs with the PWM at maximum (255).

Browsing around searching for implementations I have seen that most of the time PWM is used on the enable pins, but on some (very few) designs I have also seen PWM on the input pins. 

The question is:  which is best/recommended?  PWM on the enable pins or on the input pins?

Five free Insect Bot Mini kits

This is a free (well, it does not cost money) giveaway of 5 Insect Bot Mini kits.

 

All 5 kits are gone now, please do not request anymore but you still can comment :-)

 

Qwerk control with Processing 2

Here's some more progress towards a processing-based control panel: got mouselook video feed, and keyboard controlled motors/LEDs/sound effects now! Also, I've upgraded to filming in High Def (that version is here- http://www.youtube.com/watch?v=rMHlcNt5O60&fmt=22)
I'm back guys. This here was intended to draw graphs of equations, but for the sake of ease i made it to just draw, Or may be write(Provided you can control it). If … Read more

How small can I make my robot tree? ...stepper motor vs regular servo

Hi All,

I came up with an idea to make a 40 servo robot tree (or seaweed) that can flail its trunk and branches, lol! The trunk will consist of 8 servos (red), and there will be various other servos scatterd around to provide branch and twig movement (blue)

 

This site and others have been very helpful just by looking at guides etc.  It seems as if all i need to make this robot is servos, a frame, some type of board with the motion program, and power.

Searches for light, and at same time avoids objects.
Using a
My first bot ever, before my Botty 2. This one wanders around, and scans for places with the most light. and avoids objects. It's a very slow bot, so video is … Read more
This is a simple line follower robot that is designed for the purpose of applying pwm control with opamps without using any microprocessor. 5 CNY70 reflective … Read more

Pulse oximeter Mk II

I just started to build a second version of a pulse oximeter. If you don't know what a pulse oximeter is, here is a simple but detailed description what a pulse oximeter is and how it works.

Cardboard Robot Game - starring LMR Look-alikes (rik-puff-calculon-mikv Pyro style !!)

Just for fun i found this game with an uncanny likeness to LMR bods.

including  rik (with Admin-glasses)- puff (the Dragon) - Calculon320 (the robot)- mikv (pyrotechniques).

There are too many synchronous LMR events in this game ....... (did an ex spammer make it !!!!)

Sneak Preview of Navigate & Map (NaM) (XMOS)

Well, here's the early beginnings of my Xmos project.

3886275862_59f16618f7.jpg
A dead PS2 mouse, a micro servo, a Sharp GP2D12, and a WowWee Bugbot.

Yes, this is half (well, okay, slightly less than half) of the project. Figure I'll just build one to start off. Once I make it work then it's easier to build the second one.

Price: $0.45 USD

 Collected by one member
This 0.05" diameter, 1.75" long by 0.6" wide flat-ended hex key works with small hex screws, such as the set screws included with our mounting hubs. Read more

Arduino vs. Picaxe syntax

The idea of this thread is to provide a place for asking question about the SYNTAX of the Arduino and Picaxe languages. I invite everybody to do the same and I'll be happy to help with Arduino syntax. Perhaps we can create a basic "dictionary" between the two and hopefully this will help the users of the respective platforms to SHARE code.

Perhaps we're not so different after all :)

 

Here is something to get us started:

 

Trigonometry mostly, so that it can decide where to go next. Also avoids obstacles …
<p>I'm not sure if you allow Lego robots on this site, but here she is anyway.<p> <p>Since getting into Lego Mindstorms I've made and subsequently … Read more

xmos progess anyone?

Calculon recieved a note from his lovely postman indicating that he will get it on monday. :)

From what he's been able to read, he gets the impression that almost all mechanics/electronics (motor control, LED control, adc, sensor-type switches, and so on) must be handled by other ICs that communicate to/from the xmos board with serial ...

Is that right, or is there something he doesn't understand yet?