Loading

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

Logitraxx Snow Cat Explorer

by SLI, published

Logitraxx Snow Cat Explorer by SLI Apr 29, 2014
0 Share
Download All Files

Thing Apps Enabled

Order This Printed View All Apps

Use This Project

Give a Shout Out

If you print this Thing and display it in public proudly give attribution by printing and displaying this tag.

Print Thing Tag

Thing Statistics

7188Views 1426Downloads Found in Robotics

Summary

The Snow Cat Explorer cab bolted to the Logitraxx platform and using up about 25 or so GPIO.
The bot was designed by SL Interphase, LLC
www.sl-interphase.com
The Snow Cat utilizes a custom 182mm (Logitraxx) board that supports the Tamiya Vehicle Chassis kit mounting hardware that is widely available. It also uses the Tamiya 70168 twin motor gearbox. The Snow Cat is part of a vehicle offering currently available on Kickstarter. http://kck.st/W9gPef

Our FPGA based snow cat uses a second generation autonomous drive algorithm we've been tinkering around with that employs two sonic range finders. The first sensor is fixed mounted on the front and serves as the main obstacle avoidance sensor. The second is mounted on a servo up on the roof and looks around when the vehicle cannot move forward. There is also a light sensor controlling the headlights, taillights, porch, and KC lighting.
The Logitraxx uses a Spartan 6 LX9 FPGA for its brain and does not have a CPU or run any software. We also integrated a RC receiver so that we could switch out from autonomous mode to RC mode when the vehicle gets stuck. One of the pleasant features of the FPGA is that the GPIO is so incredibly flexible, you can program it to behave in almost any manner rather quickly and communicate with almost anything.
Every time we got something working, we starting looking around to see what else we could integrate with it. Our latest integrated device is a Specktrum AR6115e RF receiver, which we quickly integrated into the FPGA logic. The nice thing about the AR6115e is that it works on a wide voltage range. We ran the AR6115e from a +3.3v source and connected its outputs directly to the FPGA GPIO.
http://www.youtube.com/watch?v=yUi5Ioa9e1s
The video link below demonstrates the remote control being switched on/off...
http://www.youtube.com/watch?v=lYuB_UQ4jIY

Instructions

The cab and top simply glue together. We used hot glue so that we could remove the top when we wanted. We may update these with screw holes later. The servo mount on the roof supports the CSCR-55 servo. The cab mounted sonic sensor is designed to fit the Parallax Sonic Range Finder, but will need clearancing when you print it to make it fit.
The track legs are designed to fit the Tamiya vehicle chassis kit bolt holes. The Logitraxx board is 182.85mm in total length. A bit longer than the wooden chassis that comes in the kit. You'll need to cut out your own board (we did this with a 9x6" bare copper PCB) if you want to use the Snow Cat on something besides the Logitraxx board since its not available for purchase yet. However the Tamiya parts will all fit and work with the Snow Cat mechanicals.
The Snow Cat Cab is designed to mount backwards on the Tamiya Vehicle Chassis kit mechanicals and drive the vehicle "backwards". This left us with plenty of room to plug in all the GPIO connections. So, notice the RF, LF, RR, LR designators on the cab mount struts.

More from Robotics

view more

All Apps

3D Print your file with 3D Hubs, the world’s largest online marketplace for 3D printing services.

App Info Launch App

This App connects Thingiverse with Makeprintable, a cloud-based mesh repair service that analyzes, validates and repairs most common mesh errors that can occur when preparing a 3D design file for p...

App Info Launch App

Kiri:Moto is an integrated cloud-based slicer and tool-path generator for 3D Printing, CAM / CNC and Laser cutting. *** 3D printing mode provides model slicing and GCode output using built-in...

App Info Launch App
KiriMoto Thing App

With 3D Slash, you can edit 3d models like a stonecutter. A unique interface: as fun as a building game! The perfect tool for non-designers and children to create in 3D.

App Info Launch App

I don't suppose you have published all the code to run this beauty? I'm thinking of running this off an Arduino instead of the MotorAir I have now.

Top