====== MediaTek MT3329 GPS ======

==== Matériel ====

{{:tek:board_gps.png?450|}}

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


{{:tek:schema_gps.png|}}

==== 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: ===


<code>
$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)
</code>
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 ===

<code>
$PMTK251,4800*14
$PMTK251,9600*17
$PMTK251,19200*22
$PMTK251,38400*27
</code>

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 ===

<code>$PGCMD,16,0,0,0,0,0*6A</code>

=== 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：

<code>$PGCMD,16,1,1,1,1,1*6B</code>


=== 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: 

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

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




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

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