Editing Digital compass
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- | All information pertains to the [[ | + | All information pertains to the [[N900]]. |
'' See also [[Orrery]], a night-sky viewer which also can be used as a digital compass'' | '' See also [[Orrery]], a night-sky viewer which also can be used as a digital compass'' | ||
- | + | = Why a compass is needed = | |
- | + | == Augmented Reality (AR) == | |
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* GPS gives location of device; compass gives orientation | * GPS gives location of device; compass gives orientation | ||
* Allows pointing the device and getting information relevant to the pointed direction | * Allows pointing the device and getting information relevant to the pointed direction | ||
* E.g. Layar, Wikitude | * E.g. Layar, Wikitude | ||
- | + | == Navigation == | |
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* Car navigation | * Car navigation | ||
* On-foot navigation | * On-foot navigation | ||
** Map rotation | ** Map rotation | ||
- | + | = Connection options = | |
* Optical (use one of the cameras, plus image processing) | * Optical (use one of the cameras, plus image processing) | ||
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** There used to be some GPS:s on Flash-type expansion cards. How about a compass? | ** There used to be some GPS:s on Flash-type expansion cards. How about a compass? | ||
- | + | = Compass chips or sensors = | |
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* Honeywell HMC5843 | * Honeywell HMC5843 | ||
** I2C interface | ** I2C interface | ||
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* Dinsmore analog | * Dinsmore analog | ||
- | + | = Ready-built compass modules = | |
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* Ocean Server OS4000 | * Ocean Server OS4000 | ||
* Ocean Server OS5000 | * Ocean Server OS5000 | ||
** USB and RS232 interface | ** USB and RS232 interface | ||
- | + | = Microcontrollers = | |
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+ | = Converters = | ||
* I2C to RS232 | * I2C to RS232 | ||
** http://www.gedanken.demon.co.uk/rs232-converters/i2c.html | ** http://www.gedanken.demon.co.uk/rs232-converters/i2c.html | ||
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** http://www.emv-electronics.com/de/intro/i2cbusadapter.htm (seems unavailable for purchase) | ** http://www.emv-electronics.com/de/intro/i2cbusadapter.htm (seems unavailable for purchase) | ||
- | + | = Designs = | |
- | + | == Optical image processing of compass == | |
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* Periscope-like mirror | * Periscope-like mirror | ||
- | + | == Ready-made RS232 compass modules with RS232-Bluetooth conversion == | |
- | + | == Custom board designs == | |
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This MIT project from 2002 designs a custom bluetooth digital compass http://web.mit.edu/dtfg/www/research/compass/index.html | This MIT project from 2002 designs a custom bluetooth digital compass http://web.mit.edu/dtfg/www/research/compass/index.html | ||
- | + | = Alternatives to a digital compass = | |
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* Use GPS motion to determine direction | * Use GPS motion to determine direction | ||
** Only useful for navigation, not AR | ** Only useful for navigation, not AR | ||
** Does not work if standing still | ** Does not work if standing still | ||
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* Use image processing for AR | * Use image processing for AR | ||
** E.g. artoolkit | ** E.g. artoolkit | ||
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** But for navigation or rotating maps, it could work: just glance at the optical compass, then drag the map icon to match the orientation. | ** But for navigation or rotating maps, it could work: just glance at the optical compass, then drag the map icon to match the orientation. | ||
* Combined GPS/optical compass for daytime use: | * Combined GPS/optical compass for daytime use: | ||
- | ** Use GPS location and time info to calculate current sun location (The orrery app will do this, for the sun, moon, planets etc) | + | ** Use GPS location and time info to calculate current sun location (The orrery app will do this, |
+ | for the sun, moon, planets etc) | ||
** Let user optically align to visible sun | ** Let user optically align to visible sun | ||
[[Category:Brainstorm]] | [[Category:Brainstorm]] | ||
[[Category:N900 Additional Hardware]] | [[Category:N900 Additional Hardware]] |
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