Mindboards

hi,
anyone from Europe (EU) who wants to purchase single Tetrix parts? (overseas shipping is possible but probably too expensive).

parts: metal building/construction material (liftarms, wheels, gears, axles etc), motor controller, servo controller, 2 motor encoders

please contact me by PM!

Can you post a picture of all of the parts?

it's too much.

at first I intended to sell all and everything except 2 DC motors and about a dozen liftarms which I use for my vehicle.
But selling the whole complete bunch would be also an option.

Tetrix Education Basis Set 39143 http://www.nxt-roboter.de/main_bigware_ ... ame=tetrix


Tetrix Resource Set 31900 http://www.nxt-roboter.de/main_bigware_ ... ame=tetrix

all Tetrix parts are sold, thx for your interest!

Doc,

What are you replacing them with? Tetrix is pretty good for making large sturdy frames. Your robot is pretty huge, what are you using now?

- Xander

to be honest: I don't know yet.
There are too many things going wrong with the NXT system, especially BT (far too slow, not multitasking-safe), i2c (100-400kbps needed, and it's not chainable up to 127 like i2c standard), homebrewed approaches for parallelizations are too limited and too complicated to handle. But also the processing speed is too slow, the memory is too small, NXC is partly too limited, and other software is too complicated to work with (like nxtOSEK).

The main point is: I always have dozens of missing I/Os. But also the processing speed actually must be 10²-10³x faster (probably possible by native machine code instead of a bytecode interpreter) and also many sensors don't work like I need it for object and environmental detection and recognition (no US single shot mode on multiplexers, the cam is simply useless, no short-distance distance sensor 1-5 cm available, the gyro drift can not be compensated, the accelerometer is far too noisy, the same with the compass). So my current and future projects are all cancelled anyway.

After all it meanwhile turned out to me that the way the NXT and its accessoires are designed by Lego and 3rd party manufacturers (hardware, firmware, and software) it's simply not suitable for me.

Have you considered something like the Raspberry Pi? You should be able to use it with a USB hub and use IO multiplexers and USB controlled motor controller boards with it. You can program the whole thing in Python and the board is absolutely tiny.

Plus it only costs about 35 euro or less. I have one on order

- Xander

never heard of it before, but all sensors and motors must be attachable without any soldering, just plug-and-play.
As I have most of all Lego hardware it will have to work with those Lego encoder motors and sensors...