General GPS project notes: Difference between revisions

From Wildsong
Jump to navigationJump to search
Brian Wilson (talk | contribs)
mNo edit summary
Brian Wilson (talk | contribs)
Line 42: Line 42:
Button cell batteries - CR2032
Button cell batteries - CR2032


<pre>
[[Parts orders]]
 
Quantity  Part Number  Description  Customer Reference  Backorder Quantity  Unit Price
USD Extended Price
USD
1 4 H2053-ND CONN HEADER 10POS 2MM PCB TIN   0 0.76000 $3.04
2 10 P189-ND BATTERY LITHIUM COIN 3V 20MM   0 0.27000 $2.70
3 10 BA2032-ND HOLDER COIN CELL CR2032 EJECT   0 0.70000 $7.00
4 10 497-1442-5-ND IC POSITIVE REG 5V TO-220FP   0 0.64800 $6.48
5 10 CP-002AH-ND CONN PWR JACK 2.1X5.5MM HIGH CUR   0 0.36400 $3.64
6 10 CP-004A-ND CONN 2.1MM FEMALE PLUG 5.5MM OUT   0 0.55900 $5.59
7 4 AD22105AR-ND IC THERMOSTATIC SWITCH SS 8-SOIC   0 3.08000 $12.32
8 2 LM2597N-3.3-ND IC REG SIMPLE SWITCHER 8-DIP   0 3.78000 $7.56
9 2 LM2597N-5.0-ND IC REG SIMPLE SWITCHER 8-DIP   0 3.78000 $7.56
10 10 1N5817DICT-ND DIODE SCHOTTKY 20V 1A DO-41   0 0.30000 $3.00
11 2 P151-ND BATT 3V LITH CAMERA - BULK PKG   0 2.63000 $5.26
 
</pre>

Revision as of 01:31, 8 January 2006

I currently have three OEM GPS modules to play with. The Trimbles are 8 channel. (There is a pin compatible Lassen iQ that has 12 channels, might try one of those later).

The Garmin is 12 channel. The Trimbles are interesting because they can generate TSIP output which I can post-process in Pathfinder Office. The Garmin is interesting because I can try collecting RINEX data and postprocess that.

I have external antennas for all three. All three are similar in that they produce a datastream on a TTY signal level serial port, so I need to interface to that. My intention is to do things in 2 stages; first build a generic board to take serial data out to an RS232 port connected to a computer then to build a PIC based datalogger/interface to manage the GPS and talk to a handheld device.

At the PIC stage I want to use a Bluetooth module on the serial port so that my Dell Axim can talk to it without having any clumsy cable connection.

Garmin

Trimble

Lassen

Lassen SQ

Serial interfaces

Serial TTY to RS232

Serial TTY to Bluetooth

Serial TTY to USB

Should I get tired of how easy the RS232 and Bluetooth options can be, I might want to try USB.

PIC datalogger

Power supply

High efficiency switching voltage regulators National LM2597 3.3 and 5.0 "Simple Switcher" 8-DIP $3.78 Digikey

Requires 1N5817 Schottky diode and 100 uH inductor (M9799-ND) and the usual handful of caps.


Backup / standby power Button cell batteries - CR2032

Parts orders