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November 1, 2011 AT 9:34 pm

Bike Computer V0.1 Build

Bike Computer Back

Bike Computer Front-1

nabil’s blog: Bike Computer V0.1 Build.

I’ve build the first prototype of my bike computer and have been developing the firmware for a couple of weeks now. Everything except the temperature sensor, accelerometer, servo headers, and Li-ion fuel gauge have been populated.

There have been a few minor electrical bugs like forgetting resisters for the ISP programmer, but nothing too difficult to fix for the next prototype. The bigger problems have appeared in the software world. First, the I’ve filled all 32K of the ATmega memory mainly because of lengthy sensor configurations, USB libs and FATFS. Second, RAM has become an issue when processing things like NMEA strings or drawing complex graphics. I’ve realized there is no point in having a vibrant TFT LCD screen if the 16MHz ATmega can only achieve millisecond refresh rates, which is why I’ll probably switch to some ARM processor for the next prototype. Maybe I’ll go with the STM32F4 series.

Nabil was on our recent show-and-tell, this project is awesome!


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3 Comments

  1. One thing you might like to consider is airspeed. That combined with a GPS can tell you your head or tailwind.

    It’s just a pressure measurement of a tube facing forward.

    http://www.eaa1000.av.org/technicl/instcal/instcal.htm

    Might give some hints

  2. I’m a big bicyclist

    I’ve always wanted to make a good bike computer which showed more statistics (humidity, temp, avg speed, altitude etc..)

    Very cool!

  3. @Nick – Thanks! That is a great idea.

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