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 by ohararp ¦  Thu May 11, 2006 7:59 pm ¦  Forum: SparkFun Product Questions ¦  Topic: Power source for GPS project ¦  Replies: 13 ¦  Views: 4473

SOI_Sentinel I am looking at doing something very similar here as well. I did have question for you concerning how to prevent draining a li-ion beyond 3V. Is there a way to cut power off? The current sparkfun data logger could have some issues if you were to use li-ion batttery since the power led i...

 by ohararp ¦  Thu May 11, 2006 8:39 am ¦  Forum: SparkFun Product Questions ¦  Topic: Power source for GPS project ¦  Replies: 13 ¦  Views: 4473

lcd with a backlight can have some major power consumption. I know that a Crystal fontz GLCD 128x64 can suck nearly 400 ma for the backlight alone.

If you run li-ion you will have to step voltage up to 5V from the batteries 3.6V.

 by ohararp ¦  Wed May 10, 2006 1:46 pm ¦  Forum: SparkFun Product Questions ¦  Topic: interfase bluetooth please help!! ¦  Replies: 5 ¦  Views: 2057

If you use a voltage divider using a 1k5 ohm resistor and a 3k3 ohm resistor you can properly interface to the 3 volt device. This is how I am currently talking to an SD card right now.

GPS Data Logger 3.3V Lithium Ion ~ 800 maH

 by ohararp ¦  Wed May 10, 2006 11:54 am ¦  Forum: GPS ¦  Topic: GPS Data Logger 3.3V Lithium Ion ~ 800 maH ¦  Replies: 5 ¦  Views: 3234

I was just curious if anyone has experimented running their GPS data logger using a Lithium ion battery instead of the 4 AA batteries? I attempted to do so using a i415 Boost Mobile Battery but only for a couple of minutes. I am thinking that using this type of battery with spark funs little li-ion ...

 by ohararp ¦  Mon May 08, 2006 1:26 pm ¦  Forum: GPS ¦  Topic: GPS Datalogger SD problem... ¦  Replies: 1 ¦  Views: 1913

you can format it in windows using the right click button. FAT16 is the FAT option in the drop down menu.

 by ohararp ¦  Wed May 03, 2006 12:29 pm ¦  Forum: Wireless/RF ¦  Topic: GM-862 Level translation ¦  Replies: 2 ¦  Views: 1254

You could always use a voltage divider


 by ohararp ¦  Wed Apr 26, 2006 7:06 pm ¦  Forum: GPS ¦  Topic: Lassen iQ + Google Earth how-to ¦  Replies: 10 ¦  Views: 5794

I delete the zeros otherwise google earth freaks out.

PIC 2 PIC Using Blue Smirf

 by ohararp ¦  Thu May 19, 2005 10:48 am ¦  Forum: Wireless/RF ¦  Topic: PIC 2 PIC Using Blue Smirf ¦  Replies: 1 ¦  Views: 1936

I am using a Blue Smirf to perform a PC -> PIC(1) serial connection. Works great! Now I would like to transmit information to a secondary PIC(2) via PIC(1). Ultimately, I am using a PC to send control variable to PIC(1). Once these variables are transferred the PC is turned off and the PIC(1) contro...

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