SparkFun Forums

[Goober]

Hi, hoping someone could help, I have connected the GPS LS20031 & Open logger to make a tracker, my under standing was after powering them up, I just go for a walk then when finest turn them off. I then should be able to just remove the sim card put it into my PC & open the log file. Now this is were I get stuck, the log file is a text Doc when I open it in note pad I don't know what code it is, my under standing is the GPS should log the info in a NMEA format (witch is not happening) you can then import it in to Google earth & Google makes it into a KLM file were you can see were you have been going.
Not sure were I have gone wrong. Do I need to change a setting or convert the text file to NMEA? the sim card is FAT32 and the only contection that I left of the GPS to the logger was the GPS RX input & the TX0 output on the logger.

Regards Goobs

[michelebavaro]

Did you check for the baurates of the two devices to match before starting logging?

Mic

[Goober]

Hi Mic, thanks for getting back to me, the OpenLog says it start logging any received serial data at 9600bps & the GPS on the datasheet says TTL 9600bps,
8 data bits, no parity, 1 stop bits (default)
I dont no how to check to see if thay are both set the same, do I need a FTDI Basic Breakout - 3.3V for that?

This is what is in the Config File on the sim card. 9600,26,3,0,1,1 baud,escape,esc#,mode,verb,echo

And it is making a log file every time I start it up, this is a example.
Opening in notepad ++ it looks like this
#ññ,s9Ž³Å‡ÀIv.r$¡£¸9g˜Z—GÄ#ƒÀ@Á$
Opening in windows note pad it looks like this
猬踹얳蜘臀癉爮ꄤಣ㦸顧靚쑇茣䃀Ⓛഠ㎘ꗡ挢顠段ڊ葦憣 ೤ꀀ삣㄀豣ⴳׄﾣ␸鎵菀ᙲḧꌜⅡ됟Ⴀꒋ₂Ꮔᝡꁥ㒂飼₥调껡漯瀬烉礤㠃ꌠ⁀‹↌䐭Ⲁ飼⊥〃괢逈⒡而ꌠ@‱↌䐭Ⰰ釼ꄘ⊡⁣떘驫ఆ↓쁍艄➳Ⴤ挱⃄⧈ꏡ㷿놆ᦅ샧㍂䠝ꞣⓡ涹᠐ↀ✩쑃ꘙ䴠㷿놆ᦅ懧춑䠝➣ⓡ涙᠐ↀ⼩쑃ꘙ䴠᣿⃥Ѓ괂螳聡攩⒅줁聜ꈅ⁀‹↌䀽⒀ー댠ⓡБ舅쀀↘◅똟⊀ꂋ₂ᎄ
Thanks again, Goobs

[jremington]

Looks like a baud rate mismatch to me. Use a FTDI or CP2101 usb-serial converter with a PC to check the baud rate of the GPS unit.

[trialex]

Yeah my LS23001 defaults to 57600 after a power loss.

PS when you are changing baud rates, you need to reduce the number/frequency of sentences being output - it defaults to 5Hz of three sentences. This is too much to transfer at 4800bps, so if you try to set that baud rate first it won't work.

[Goober]

Thanks guys for the help ,I have been away for a bit, but back now. So I will get my self a FTDI & check The baud rate of the GPS, I think I know what you mean trialex when you say that I need reduce the number/frequency of sentences being output. If I get stuck I know were to come. Thanks !
Goobs