Let's Make Robots!

Arduino mega issue

Hi everyone, I'm new to this web site and also to robotics so please bare with me, I have a arduino mega 2560 and a mega sensor shield version 2. When I installed the sensor shield onto the arduino mega board the feet where the power selector has been soldered touched the outer casing on the USB connector and cased a short on the board which in turn burnt out the little component ( I'm guessing resistor) next to the USB connector. I have fixed the cause of the problem but would like to know if I can still use the arduino mega with this component issue. Thanks

Any interest in a temporary IRC Channel?

You all remember IRC right? No? It's basically the godfather of the shoutbox. Yes, it's still around. Since I'm probably the one who broke the SB I feel like it's up to me to do something about it. First step, admit you have a problem: we're a bunch of Shout addicts. Or we could all just go to the hang out. What is the level of interest here?

Any propellor you want, as long as it's black

Today, on the IRC channel, 6677 posted this link:


where Parallax has open-sourced the Verilog code for their propellor chip.  This could be very interesting.

How to Make a Robot

I am totally new to this world and want to make my first robot Using pic or microcontroller.

I want to make with the parts i have.

Pic12f675,16f877,At89c51,At89c2051,LM339,ultrasonic rangefinding,Lcd,Breadboard ,motors with wheels and many more.

Can any One help me to make my first robo.

quadcopter board for balancing robot - motor control assistance/ideas needed

I'm planning on using the Micro MWC Flight Control Board DSM2 ESC's X4 Brushed Integrated

Cricket Chirps

Without the shoutbox it seems oddly quiet and lonely. How did we ever have LMR without it?  :-)

"Hello?......"   (echo's down the hallway)


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?

T'REX robot controller


The T'REX robot controller makes controlling robots easy!

The Arduino compatible controller comes pre-programmed with sample code that lets you control it with a supplied Android app, Radio Control or with an external controller via I²C.


Heads up :- Official Hackaday Prize entry - LMR entries Gareth (Tee Shirt on its way :-)

Just a heads up to inform everyone that the "Voting" has started on  The Hackaday Prize

Caution:- Dont get caught by the winning prize (its metaphorical) :-

"To Win a trip to space"

That's right, one hardware hacker will get a trip into space as the grand prize. There are incredible top prizes for the other four finalists, and hundreds of other rewards for the most interesting submissions.