Table des matières
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
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