Digital compass - Revision history

amigadave: better N900 link

2011-01-27T15:53:31Z

better N900 link

← Older revision		Revision as of 15:53, 27 January 2011
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-	All information pertains to the [[N900]].	+	All information pertains to the [[Nokia N900\|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''

amigadave: wikify slightly

2010-08-16T10:36:48Z

wikify slightly

← Older revision		Revision as of 10:36, 16 August 2010
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	'' 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 =	+	== Why a compass is needed ==
-	== Augmented Reality (AR) ==	+
		+	=== Augmented Reality (AR) ===
		+
	* 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 ==	+
		+	=== Navigation ===
		+
	* Car navigation		* Car navigation
	* On-foot navigation		* On-foot navigation
	** Map rotation		** Map rotation

-	= Connection options =	+	== 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 =	+	== Compass chips or sensors ==
		+
	* Honeywell HMC5843		* Honeywell HMC5843
	** I2C interface		** I2C interface
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	* Dinsmore analog		* Dinsmore analog

-	= Ready-built compass modules =	+	== Ready-built compass modules ==
		+
	* Ocean Server OS4000		* Ocean Server OS4000
	* Ocean Server OS5000		* Ocean Server OS5000
	** USB and RS232 interface		** USB and RS232 interface

-	= Microcontrollers =	+	== Microcontrollers ==
		+
		+	== Converters ==

-	~~= 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 =	+	== Designs ==
-	== Optical image processing of compass ==	+
		+	=== Optical image processing of compass ===
		+
	* Periscope-like mirror		* Periscope-like mirror
-	== Ready-made RS232 compass modules with RS232-Bluetooth conversion ==	+
-	== Custom board designs ==	+	=== Ready-made RS232 compass modules with RS232-Bluetooth conversion ===
		+
		+	=== Custom board designs ===
		+
	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
-	== Attaching another compass and Bluetooth/WiFi capable phone ==	+
		+	=== Attaching another compass and Bluetooth/WiFi capable phone ===
		+
	Instead of spending money and time to buy all necessary parts and develop a custom solution, buy the cheapest used Android phone on eBay (G1/Dream, Tattoo?), attach it to the back of N900 with two elastic bands, but without covering the camera lens. Then create an App on the Android phone that just transmits compass coordinates via Bluetooth/WiFi.		Instead of spending money and time to buy all necessary parts and develop a custom solution, buy the cheapest used Android phone on eBay (G1/Dream, Tattoo?), attach it to the back of N900 with two elastic bands, but without covering the camera lens. Then create an App on the Android phone that just transmits compass coordinates via Bluetooth/WiFi.

-	= Alternatives to a digital compass =	+	== Alternatives to a digital compass ==
		+
	* Use GPS motion to determine direction		* Use GPS motion to determine direction
	** Only useful for navigation, not AR		** Only useful for navigation, not AR
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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,	+	** Use GPS location and time info to calculate current sun location (The orrery app will do this, for the sun, moon, planets etc)
-	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]]

tiagotiago: /* Alternatives to a digital compass */ GPS motion : "Ignores the orientation of the device (e.g. if you're walking backwards the map will be upside down)"

2010-08-15T09:14:18Z

Alternatives to a digital compass: GPS motion : "Ignores the orientation of the device (e.g. if you're walking backwards the map will be upside down)"

← Older revision		Revision as of 09:14, 15 August 2010
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	** Only useful for navigation, not AR		** Only useful for navigation, not AR
	** Does not work if standing still		** Does not work if standing still
		+	** Ignores the orientation of the device (e.g. if you're walking backwards the map will be upside down)
	* Use image processing for AR		* Use image processing for AR
	** E.g. artoolkit		** E.g. artoolkit

edgarsz: /* Designs */

2010-06-29T12:28:56Z

Designs

← Older revision		Revision as of 12:28, 29 June 2010
Line 63:		Line 63:
	== Custom board designs ==		== Custom board designs ==
	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
		+	== Attaching another compass and Bluetooth/WiFi capable phone ==
		+	Instead of spending money and time to buy all necessary parts and develop a custom solution, buy the cheapest used Android phone on eBay (G1/Dream, Tattoo?), attach it to the back of N900 with two elastic bands, but without covering the camera lens. Then create an App on the Android phone that just transmits compass coordinates via Bluetooth/WiFi.

	= Alternatives to a digital compass =		= Alternatives to a digital compass =

83.253.0.12: /* Connection options */

2010-02-27T17:06:09Z

Connection options

← Older revision		Revision as of 17:06, 27 February 2010
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	** Bluetooth data		** Bluetooth data
	** Bluetooth audio - sending analog signals via Bluetooth microphone for digital signal processing on the N900		** Bluetooth audio - sending analog signals via Bluetooth microphone for digital signal processing on the N900
		+	*** Possibly a Bluetooth stereo microphone (Sony ECMHW1) could send the Sin,Cos signals from an analog compass sensor (Sensor 1525, www.dinsmoresensors.com) to the N900. Direction would then be determined essentially by arctan2 and possibly low pass filtering for noise reduction.
	* FM radio		* FM radio
	** Requires headphones be connected		** Requires headphones be connected

83.253.0.12: /* Custom board designs */

2010-02-24T22:18:24Z

Custom board designs

← Older revision		Revision as of 22:18, 24 February 2010
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	== Ready-made RS232 compass modules with RS232-Bluetooth conversion ==		== Ready-made RS232 compass modules with RS232-Bluetooth conversion ==
	== Custom board designs ==		== Custom board designs ==
		+	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 =		= Alternatives to a digital compass =

kenyoung at 23:57, 22 February 2010

2010-02-22T23:57:46Z

← Older revision		Revision as of 23:57, 22 February 2010
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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	+	** 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]]

dneary: N900 Hacking Compass moved to Digital compass over redirect: Page title capitalisation (no trailing caps, no CamelCase). Shouldn't include device name in page title. Page name isn't very descriptive - what's a "hacking compass"? Overall, "Digital

2010-02-22T16:03:07Z

N900 Hacking Compass moved to Digital compass over redirect: Page title capitalisation (no trailing caps, no CamelCase). Shouldn't include device name in page title. Page name isn't very descriptive - what's a "hacking compass"? Overall, "Digital

← Older revision

Revision as of 16:03, 22 February 2010

speedevil: /* Connection options */

2010-02-22T12:50:17Z

Connection options

← Older revision		Revision as of 12:50, 22 February 2010
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	* Optical (use one of the cameras, plus image processing)		* Optical (use one of the cameras, plus image processing)
	** Best to use user-facing camera, so the world-facing can be used for capturing the world image for AR		** Best to use user-facing camera, so the world-facing can be used for capturing the world image for AR
		+	*** Both cameras cannot be used at the same time - and the front camera is lower quality.
	* USB		* USB
	** Unknown if USB host possible.		** Unknown if USB host possible.

speedevil: /* Alternatives to a digital compass */ remove root hardware category

2010-02-22T12:48:07Z

Alternatives to a digital compass: remove root hardware category

← Older revision		Revision as of 12:48, 22 February 2010
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	** Let user optically align to visible sun		** Let user optically align to visible sun

-	~~[[Category:Hardware]]~~
	[[Category:Brainstorm]]		[[Category:Brainstorm]]
	[[Category:N900 Additional Hardware]]		[[Category:N900 Additional Hardware]]