Revision as of 22:26, 20 August 2008

Just ordered my FreeRunner.

I want to use it as bicycle computer.

These are just ideas and wishes - not worth to make a separate wiki page.

Bicycle Computer

Power Supply

Due to the relatively high current consumption of the Freerunner a power supply from a hub dynamo seems to be unavoidable.

I have a evaluation board of a Linear Technologies step converter which I will use at the beginning.

GPS

• navit
• tangogps

Additional GPS Functions

Altitude Plots

Of the travelled track and also of the upcoming (hopefully OSM will soon provide elevation information of the roads)

Trip Information

Garmin Etrex Legends trip information display is to stupid. I want infos for the current day and for the time since last break.

Slope, Vertical Speed

The GPS does not give sufficiently accurate vertical speed. A barometric sensor would be nice. Calculation of the vertical speed by integrating the accelerometer readings also not accurate. But maybe it is possible to use the accelerometers to measure the slope of the road. How to calibrate it? Is it possible to automatically calibrate it from GSP reading?

Sideward Inclination of the Bicycle

By measuring the increase of the total acceleration not by change of the acceleration angle.

Road Quality

Can the road (e.i. surface) quality be recorded by measuring the vibrations with the accelerometers?

Car Counter

... using the builtin microphone. Or would it be possible with the accelerometers using high sampling rate?

Other Accelerometer Ideas

• Indoor use of those GPS games