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DIGILENT Pmod GPS

Brian0925
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The Pmod HAT Adapter  (144-8419)  makes it easy to connect Pmods to a Raspberry Pi. It supports plug-and-play functionality, only requiring that the host Raspberry Pi is booted with the Pmod HAT attached.

The Pmod HAT has three 2×6 Pmod ports and provides access to additional I/O available via the Raspberry Pi 40-pin GPIO connector. Designed in collaboration with RS Components, users can take advantage of example Python libraries and demo tutorials hosted on DesignSpark.

GPS (134-6455) can provide satellite positioning accuracy to any embedded system, especially the Raspberry Pi, by communicating via UART with the GPS module.

Getting Started

We begin by typing the following commands on the terminal:

sudo apt-get update

sudo apt-get dist-upgrade

sudo apt-get install -y build-essential git libusb-1.0-0-dev libprotobuf-dev libleveldb-dev libsnappy-dev libopencv-dev libhdf5-serial-dev protobuf-compiler libatlas-base-dev git automake byacc lsb-release cmake libgflags-dev libgoogle-glog-dev liblmdb-dev swig3.0 graphviz libxslt-dev libxml2-dev gfortran python3-dev python3-pip python3-setuptools python3-markdown python3-pillow python3-yaml python3-pygraphviz python3-h5py python3-nose python3-lxml python3-matplotlib python3-numpy python3-protobuf python3-dateutil python3-skimage python3-scipy python3-six python3-networkx libfreetype6-dev libjpeg-dev python3-gst-1.0 python3-picamera

sudo pip3 install pyserial

sudo pip3 install designspark.pmod

We need to turn on the serial function of the Raspberry Pi

sudo raspi-config

>5 Interfacing Options
>6 serial
>Would you like a login shell to be accessible over serial?
>No
>Would you like the serial port hardware to be enabled?
>Yes

This program code means that we have to insert the Pmod GPS into the Pmod HAT Adapter JCA slot. The JCA slot means that the upper 6-pin in slot JC.

if __name__ == '__main__':
    
    GPS = createPmod('GPS','JCA') # UART port is only avairable on JCA
    time.sleep(0.1)
    print("create success")

Now we use the following code to get access to the GPS's satellite communication function and receive data from satellites every half second.

    try:
        while True:
            
            """
            LINE = GPS.getGPSLine()
            print(LINE)
            time.sleep(0.5)
            """
            GPS.gpsUpdate()
            print(GPS.getGPSPosData())
            time.sleep(0.5)

The GPS module may take more than 15 mins to setup.

sudo python3 /home/pi/Desktop/DesignSpark/example/GPS_example.py

or 

sudo python /home/pi/Desktop/DesignSpark/example/GPS_example.py 

Here is the output with an accurate time:

... this is a bad example:

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