MediaTek MT3329 GPS

Matériel

Sur les 6 fils qui sortent :

rouge : pas de connexion
noir 1 : pas de connexion
noir 2 (marqué IN) : TX inversion par rapport au schéma
noir 3 (marqué OUT) : RX inversion par rapport au schéma
noir 4 : 5V
noir 5 : masse

Commandes logicielles

DIYDrones.com

de http://docs.google.com/Doc?docid=0ASI4WbhJsiyqZDk3MndtYl8yN2R2ajVmOGdy&hl=en

CheckSum calculator: http://www.hhhh.org/wiml/proj/nmeaxor.html

améliorer le decodage:

$PMTK286,1*23

Change unit refresh rate:

$PMTK220,100*2F       //Will set the GPS to 10hz (or updates every 100 milliseconds)
$PMTK220,250*29       //Will set the GPS to 4hz (or updates every 250 milliseconds)
$PMTK220,1000*1F     //Will set the GPS to 1hz (updates every 1000 milliseconds)

You can set the GPS to any desired refresh rate, you change the value inside the string and generate a new check sum here: http://www.hhhh.org/wiml/proj/nmeaxor.html

To change the baud rates

$PMTK251,4800*14
$PMTK251,9600*17
$PMTK251,19200*22
$PMTK251,38400*27

You can also set the GPS to any desired baud rate speed by changing the value inside the string and generate a new checksum here: http://www.hhhh.org/wiml/proj/nmeaxor.html

Enabling the custom binary protocol

$PGCMD,16,0,0,0,0,0*6A

To use NMEA and enable or disable string please refer to this table

Customize Command Format	Table 2
Name	Example	Units	Description
Message ID	$PGCMD		Customize command header
Command Number	16		This number represents which command is used
Parameter 1:RMC	1		Period of RMC, 0~5. 0 mean to disable output
Parameter 2:VTG	1		Period of VTG, 0~5. 0 mean to disable output
Parameter 3:GSA	1		Period of GSA, 0~5. 0 mean to disable output
Parameter 4:GSV	1		Period of GSV, 0~5. 0 mean to disable output
Parameter 5:GGA	1		Period of GGA, 0~5. 0 mean to disable output
Checksum	*6B
<CR> <LF>			End of message termination

Example that will enable all the messages：

$PGCMD,16,1,1,1,1,1*6B

Note

When using arduino environment you must add “\r\n” at the end command each line, for example if you want to send the message “$PMTK220,250*29” to the GPS unit, it will be:

Serial.print("$PMTK220,250*29\r\n"); //This is correct

Serial.print("$PMTK220,250*29"); //INCORRECT!

For deeper information and more command examples please read the official MTK command manual

http://docs.google.com/fileview?id=0ByI4WbhJsiyqZjVjNTczNWEtZjczYi00YjY4LTlmMTgtNGIxZDcxZmFhMjEw&hl=en