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finally work fine
http://www.weirdlab.fr/?p=39

thx everyone

finally rewrite the code with AltSerialSoft, and it work fine


#include <SD.h>
#include <AltSoftSerial.h>

const int buttonPin = 17; // Declare PIN 17 for charging control
int buttonState...

thx ZTiK.nl

the default baudrate of MTK3339 is 115200 ?
because my EM406 use 4800 default u know

u set it before receiving data ?

Hello everybody,

I have a Teensy 2, and i want to be able to log the NMEA message from a EM406 GPS

I have take the sketch from http://www.ladyada.net/make/gpsshield/download.html
and i want to...