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Register reader Ray revs radio-controlled Raspberry Pi race rover

Frikkin' laser armament planned for US invasion

Pics and vid As geeks worldwide continue to come up with inventive ways to deploy the hit Brit minikit Raspberry Pi, and the publication of a 101 uses for a...* guide is surely just a matter of time, Reg reader Ray Brooks has been in touch to show off his prototype carbot powered by the diminutive ARM-compatible computer.

Ray is a JavaScript engineer at the UK tentacle of business social network Yammer, and has applied his skills to converting a Tamiya TL-01 radio-controlled model car chassis - with a 28T "lightly-tuned" motor - into a "autonomous/semi-autonomous race vehicle".

A view of Ray Brooks's carbot

As Ray explained, the onboard kit comprises:

  1. Raspberry Pi Model B
    • Runs Arch Linux.
    • Control software written in Node.js.
    • Talks to other onboard devices using USB serial.
    • Talks to outside world/computer using WebSockets over Wi-Fi.
  2. Arduino - Currently just provides voltage data for detecting low battery status but has a large prototyping board for further experiments
  3. Pololu Maestro servo controller - Proprietary serial protocol: Send values, moves servos
  4. Phidget GPS - Provides live GPS data to control software
  5. Phidget Spatial 3D linear accelerometer (for detecting lateral movement and crashes)
  6. 3D angular accelerometer (to figure out which direction we're facing) and
  7. 3D compass.

The internal electronics of Ray's carbot

The car can be monitored via a web page hosted on the car itself, which shows its status, its spatial orientation and exact position via Google Earth (click for a bigger version):

Screengrab showing the car's interface, with position on Google Earth

While it currently requires some keyboard input to get things rolling, Ray's poised to mount an RPi Foundation camera to beam back images from the vehicle and a "laser-based object avoidance" system, with a view to complete autonomy.

His ultimate aim is to take on the competition in an obstacle race at Sparkfun's Autonomous Vehicle Competition (AVC), held annually over the Pond in Boulder, Colorado.

We wish him well. We're always happy to hear about reader projects worthy of a write-up, so if you're working on something tasty or provocative, let us know right here. ®

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*Or perhaps 50 Fun Raspberry Pi Recipes?

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