Let's Make Robots!

URGENT! Need help with some ideas to "improve" the insect bot

I have about 4 months to make a project but I have to give a presentation tomorrow about what I'm gonna do in the next 4 months so I need some ideas guys. I have decided on making a basic legged robot which avoids obstacles and since it's very short for 4 monts, I was wondering what else can I add to make it more complex ?  I was thinking of adding a bluetooth module for controlling it via a laptop or smartphone and a gps module for coordinates or something .

What does this circuit do?

Found this today... I'm trying to figure out what it does. Any guesses?

Jitter problem with TLC5940 controlling 12 servos

Hi guys, I am a beginner in arduino and robotics. Recently I am starting a project for a 12DoF hexapod. I am controlling the servos(Tower pro micro servo SG90) using a TLC5940 based on this schematic by John Boxall:

From the schematic,I changed the LEDs to servos and attached a 2.2kOhms resistor between every output and the external voltage(in my case external voltage is from 4x1.5V AA battery)

CV and micromotion algorithms

Interesting.  I wonder how difficult it would be to port it to OpenCV?

Need a coupling for a 28BYJ48 stepper motor...

I'm building a device to pan a small camera. I'm using the uber cheap 28BYJ48 stepper motor. To mount the camera to the stepper motor I need a small coupling. One side should be bolted to the axle of the stepper motor, the other end should have 1/4"-20 thread (standard camera thread). Is there anyone here that could make me such a thing? I would like to build a decent, sturdy device so I don't want to resort to hotglue... I'm located in the EU (Belgium), any European people here that can machine such a coupling?

Drawing of the piece (dimensions are in mm):

Cheap Simple Robots

Hi;

I am starting a Robotics and Computing club at my School and need some ideas for some cheap, simple robots that I can get the kids building.

The idea will be that they / their parents buy the materials based on info that I supply and I help them build there robots during the club (aprox 6 hours total).

I don't really want Maplins type toy looking robots and anything with a microntroller is hoing to be to expensive. The topic for the term is renewable energy and climate change so recycled robots may be on the cards?

Powering an Arduino NanoATMega328

Hi;

I have just put together and ordered some parts to build a value for money robot that I will be demonstrating and getting the kids in my school robot club to build.

Do H-bridge resistor values need to be calculated, or can they be played by "ear"?

Hi All,

I followed an H-bridgeschematic from a post by ignoblegnome and the resulting H-bridge worked perfectly.  I looked around online and saw some h-bridge schematics without resistors and also with resistors.  I wanted to know if resistors were necessary in h-bridges?  And I also came across a specific formula that is used to calculate the base resistor needed for a certain transistor.  Do these calculations need to be followed religiously? 

The Parallella Board?

I was wondering what people think of this board and the supercomputer that this guy built with them.

The Board:

https://www.parallella.org/board/

This guy built his own supercomputer with 8 of them (each with 18 cores) wrapped around a gigabit switch and a couple of Intel I3 NUCs.

The Supercomputer:

https://www.parallella.org/2014/06/03/my-name-is-brian-and-i-build-supercomputers-in-my-spare-time/