GPS (GP-20U7) + Raspberry Pi 2

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Wiring GPS

Timeline
  1. Voltage and Ground - There will be 3 wires: a red one for voltage, usually indicated by VCC, and a black one for ground, indicated by GND. Connect the VCC to the 3.3V pin and the GND to the GND pin.
  2. Locate serial pin on GPS - As with any GPS, we need to locate the serial connection for the GPS. There should be one more serial wire connected to the rx or tx pin of the GPS. It should be tx if you wish to receive GPS data on the Raspberry Pi.
  3. Connect to corresponding serial pin on Raspberry Pi - Once you know which GPS serial lead you have, connect it to the opposite serial pin on the Raspberry Pi so they may communicate data. (rx to tx, tx to rx)
Raspberry Pi 2 Model B pin layout

















Connecting GPS to Serial Port

Open Serial Port using terminal commands below:

sudo rasps-config
Select 8, A8, no, ok, finish
Reboot
dmesg | grep tty

Configure for GPS by matching the baud rate, parity, stop bits, and bit size to the data sheet values provided.

def set_up_gps():
     ser = serial.Serial(
        port = '/dev/ttyAMA0',
        baudrate = 9600,
        parity = serial.PARITY_NONE,
        stopbits = serial.STOPBITS_ONE,
        bytesize = serial.EIGHTBITS,
        timeout=1
        )
     counter=0
     return ser