Hey! This thing is still a Work in Progress. Files, instructions, and other stuff might change!

Logitank, made for Logitraxx Vehicle Chassis Kit

by SLI, published

Logitank, made for Logitraxx Vehicle Chassis Kit by SLI Apr 22, 2014
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6401Views 1250Downloads Found in Robotics


This is a body top made for the Logitraxx chassis. Logitraxx is an FPGA based robot kit built on the Tamiya vehicle chassis platform using a custom length board.
The bot was designed by SL Interphase, LLC
We recently launched this on Kickstarter.
The tank model files are still a work in progress so they may change as we refine the design.
Its main purpose was to be a learning platform for developing robotics using the Spartan 6 FPGA. The robot demonstrates the basics of hardware accelerated parallel executed functions. Its navigation firmware and obstacle avoidance is pure hardware. The robot does not have a CPU and does not run any software (though you could integrate a processor based board like Arduino to its GPIO if you wanted).
As for the mechanical parts, they are still a bit rough and require some filing for fitting. the holes on the front plate are for the IR sensors and headlights. There is no back plate since the motor gearbox on the back of the Logitraxx essentially serves as the back plate.
You see a quick clip of it with grey printed turret moving around here...
Turn learn more about how an FPGA is different than a CPU, check out our Kickstarter video here...


The body fits the CSRC-55 servo rather snugly. We made it tight so that you could file it and fit it without glue. Makes it easy to disassemble later.
It bolts together using #4x1/2 for either wood or sheet metal available at most hardware stores.
The gaps on the front portion are for the Logitraxx IR sensors and headlights. If you don't need them on your own creation you can just fill them in.

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Can you make the code available?

In the video you say "Arduno Uno Mini" but I think you mean "Arduino Pro Mini".

Yes, thats true. The Pro Mini is what is shown. Though its only an example. The thing about FPGAs is that they are CPU agnostic. They can be connected to anything really. You can use the FPGA as the brain, or wire up the FPGA to another embedded board with its own CPU like Arduino and use it as an "assistant" brain. Even a medium grade FPGA can put an Intel iCore processor to shame. The Arduino's ATMega is not very powerful, but add in the FPGA and Arduino + FPGA = Intel iCore stomper.

FPGAs have their uses. Prototyping is one of them. They are highly configurable. However they do not hold a candle to high end CPUs. Yes they stomp any ATMEL chip out there no question. Intel chips however not so much. They really don't compete in the same markets. A FPGA can be programmed to simulate a regular CPU but is far less efficient. The latest FPGAs are of course now being made through the Intel foundry. A new Intel server CPU series was also recently announced that includes a FPGA in package. The key with FPGAs is knowing how to program in VHDL or other hardware programming language.

CPUs are predefined silicon designed not for a specific, but "generic" operation. An FPGA is an undefined fabric of logic cells and connections that can be constructed into almost anything. Where they work best is application specific duties where the logic is narrowly defined around the task. In this form, no generic silicon can compete with it, not even Intel's fastest CPUs. Where many FPGA developers go wrong is they attempt to duplicate the "generic" CPU function as an FSM soft core, passing on the inherent inefficiency of most software in general "wait-in-line" philosophy of single instruction execution.

There are pieces missing.

They are all there. There is only a front, body, turret, gun and sides. The Tamiya twin motor serves as the back and of course the circuit board is the bottom. Wheels are other parts are from the Tamiya Vehicle Chassis Kit.

Can you attach the URL To the wheels?

You can find the wheels in a lot of different vendors by searching under "Tamiya Vehicle Chassis Kit". Here's as good a link as any...
You will have to switch out the single driver motor for the Tamiya twin motor gearbox of course and cut out your own base board. The wooden board that comes with the kit is too short for the tank components. They are designed to fit our own board. Of course you could resize the tank parts if you wanted as well.

-_-# seriously? Why would I buy something? This is a 3D modeling and printing website. So why would I go to a store and buy it if the whole deal is to 3D print the entire thing?

I have not modeled the wheels, but you are free to model your own.