Inertial navigation peripheral/System design: Difference between revisions

From OLPC
Jump to navigation Jump to search
Line 20: Line 20:


'''Locograph'''
'''Locograph'''

A Locograph has the following attributes:
A Locograph has the following attributes:
* '''position''': A tuple of length three - (x, y, z) - expressing coordinate change relative to the laptop in the global Cartesian space.
* '''position''': A tuple of length three - (x, y, z) - expressing coordinate change relative to the laptop in the global Cartesian space.

Revision as of 23:48, 4 November 2008

System schematics

OlinInterialNavigationSystemDiagram.png

note: Greg fails at typing "inertial"

Software Systems

OlinInertialNavigationSoftwareOverview.png

Microcontroller

Python "Driver" Class

The driver class for the Locograph will be a Python class called "Locograph". Locograph will handle connecting to the USB device using libusb, meaning a user of this class merely needs to instantiate one and start asking it for values.

Here is something like a UML diagram for Locograph:

Locograph

A Locograph has the following attributes:

  • position: A tuple of length three - (x, y, z) - expressing coordinate change relative to the laptop in the global Cartesian space.
  • bearing: A number - 0 to 1 - expressing how much of a rotation the laptop has completed in the global Cartesian space.

A Locograph offers the following methods:

  • getPosition(): returns self.position
  • getBearing(): returns self.bearing
  • _updateFromDevice(): polls the USB device for new values.
  • _mapDevice(): sets up the USB device originally.
  • reset(): client asks for coordinate reset.
  • _reset(): ask USB device for coordinate reset.

Python "Game" App

Form factor

(insert sketches)

(include sketch model picture)