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hopslink is offline hopslink
2009-09-27 , 22:59
Posts: 7 | Thanked: 1 time | Joined on Sep 2009 @ Plymouth, UK
#31
Seems quite reasonable. Take a look at the RN-41 BT module, it has a built in antenna and is cheaper at digikey. I haven't looked at the datasheet but they claim a 30mA power draw when transmitting, which is less than you have estimated: http://www.rovingnetworks.com/rn-41.php

While it may be slightly easier to prototype with complete modules like arduino you will have to start again when you move to your final design. If you use one of the common, low end microcontrollers from Microchip (PIC) or Atmel (AVR) you should find very cheap programmers and free development tools exist along with loads of example code for i2c and serial comms. HTH
 

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sarahn is offline sarahn
2009-09-28 , 00:46
Posts: 243 | Thanked: 172 times | Joined on Sep 2007 @ silicon valley
#32
Originally Posted by hopslink View Post
Seems quite reasonable. Take a look at the RN-41 BT module, it has a built in antenna and is cheaper at digikey. I haven't looked at the datasheet but they claim a 30mA power draw when transmitting, which is less than you have estimated: http://www.rovingnetworks.com/rn-41.php
I think meant to put down the rn-21 actually because physical integration looked easier. It still needs an external antenna according to the DS. I think I pulled 100mA off the datasheet somewhere but maybe it was the wrong one, thanks for pointing that out.


Originally Posted by hopslink View Post
While it may be slightly easier to prototype with complete modules like arduino you will have to start again when you move to your final design. If you use one of the common, low end microcontrollers from Microchip (PIC) or Atmel (AVR) you should find very cheap programmers and free development tools exist along with loads of example code for i2c and serial comms. HTH
The arduino has the same chip I picked out, the ATmega328. In fact given it's creative commons, starting with an arduino schematic and adding bluetooth / magnetometer to it may be the best solution.

The one thing which is different from board to proto is the bluetooth module, and I am unsure that is a big deal. In fact I think for prototyping it may be better to use what was used with the n900 push http://blogs.nokia.com/pushn900/wp-c..._guidev1.0.pdf

It is going to be in the sheet but not in the prototyping total.

I am going to update the original sheet. I would have used a smaller battery but there is nothing on sparkfun between 100mAh and 1100mAh right now.
 
sarahn is offline sarahn
2009-09-28 , 00:58
Posts: 243 | Thanked: 172 times | Joined on Sep 2007 @ silicon valley
#33
So, do you think we could get money from Nokia to build what they should have put in in the first place? :P

Of course push n900 is for flashy, not for "I want to get navigation directions when I'm walking and have to stop at a crosswalk" which I see as being the first basic app.
 
texaslabrat is offline texaslabrat
2009-09-28 , 03:53
Posts: 271 | Thanked: 220 times | Joined on Sep 2009
#34
Originally Posted by sarahn View Post
r "I want to get navigation directions when I'm walking and have to stop at a crosswalk" which I see as being the first basic app.
Well, if that's the main goal....I think I just solved your problem!

Behold the latest in high-tech navigation gadgetry:

http://www.dealextreme.com/details.dx/sku.8388

(since satire doesn't come across in writing...please note this is intended to be VERY tongue-in-cheek)
 

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sarahn is offline sarahn
2009-09-28 , 15:38
Posts: 243 | Thanked: 172 times | Joined on Sep 2007 @ silicon valley
#35
Originally Posted by texaslabrat View Post
Well, if that's the main goal....I think I just solved your problem!

Behold the latest in high-tech navigation gadgetry:

http://www.dealextreme.com/details.dx/sku.8388

(since satire doesn't come across in writing...please note this is intended to be VERY tongue-in-cheek)
I know someone who lost several job interviews before he got a GPS due to showing up hours later, and still needs a GPS for routes he has used dozens of times ... a standalone compass would not help him much.
 
mannakiosk is offline mannakiosk
2009-09-28 , 20:56
Posts: 158 | Thanked: 67 times | Joined on Jan 2008
#36
Feel free to take this as a joke-post too, but...

With an old-fashioned compass, I guess one could build a contraption that would hold the compass in front of one of the cameras and use image recognition to get the bearing...
 

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texaslabrat is offline texaslabrat
2009-09-29 , 01:06
Posts: 271 | Thanked: 220 times | Joined on Sep 2009
#37
Originally Posted by sarahn View Post
I know someone who lost several job interviews before he got a GPS due to showing up hours later, and still needs a GPS for routes he has used dozens of times ... a standalone compass would not help him much.
Well, I wasn't suggesting that the compass would replace the GPS..rather the bolt-on electronic compass that is being proposed in this thread
 
sarahn is offline sarahn
2009-09-29 , 01:13
Posts: 243 | Thanked: 172 times | Joined on Sep 2007 @ silicon valley
#38
Originally Posted by texaslabrat View Post
Well, I wasn't suggesting that the compass would replace the GPS..rather the bolt-on electronic compass that is being proposed in this thread
I think it would take him at least 30 seconds to reorient himself every time he stopped.

Of course this might be a more interesting way of using the compass:

http://www.exothermia.net/monkeys_an...aptic-compass/

Image processing an analog compass would work if the compass is at a known orientation, but would be a hassle to use.
Last edited by sarahn; 2009-09-29 at 01:24.
 
texaslabrat is offline texaslabrat
2009-09-29 , 01:22
Posts: 271 | Thanked: 220 times | Joined on Sep 2009
#39
Originally Posted by sarahn View Post
No.... still not going to work for him. Trust me. :P
Well, lucky for your friend the N900 is also a phone so he can call a taxi rather than getting lost
 
sarahn is offline sarahn
2009-09-29 , 01:32
Posts: 243 | Thanked: 172 times | Joined on Sep 2007 @ silicon valley
#40
The other thing being, now I can just listen to the robot voice tell me where to go on the headphones and not have to pull out the n900 at all
 
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