Build Raspberry Pi GPS location/navigation device

While every smartphone has GPS, the Pi can also be converted into a GPS receiver with a cheap Raspberry Pi GPS module. In many outdoor applications, especially those that move (Car-PC, weather balloon, etc.), the exact position is a big advantage. Mobility is achieved with a battery pack or a USB power bank.

In this tutorial, I’ll show you how tracking works with such a GPS module and what you need for it.

Required Hardware Parts

I have used the following parts:

Setup

The wiring is very simple:

GPS Modul Raspberry Pi
 VCC 3.3V (Pin 1)
 RX TXD/GPIO 14 (Pin 8)
 TX RXD/GPIO 15 (Pin 10)
 GND Ground (Pin 6)

The Raspberry Pi pinout is here.

 

Release serial interface

If you have not already released the serial interface before, this must happen beforehand. For this we edit the following file:

sudo nano /etc/inittab

Here the following line (presumably the last one) has to be commented out (or deleted) by means of a rhombus # at the beginning. Storing is done with STR + O, finished with CTRL + X.

T0:23:respawn:/sbin/getty -L ttyAMA0 115200 vt100

Then there is the file/boot/cmdline.txt to be edited,

sudo nano /boot/cmdline.txt

the following entries are deleted:

console=ttyAMA0,115200 kgdboc=ttyAMA0,115200

The last entry does not seem to exist in all OS versions by default. Your file should look like this:

dwc_otg.lpm_enable=0 console=tty1 root=/dev/mmcblk0p2 rootfstype=ext4 elevator=deadline rootwait

For the changes to be accepted, a restart is absolutely necessary. This can also be done after installing the other software.

 

Raspberry Pi GPS Module – Software

We need a few programs to read the Raspberry Pi GPS module. Before that, however, we need to update the repositories.

sudo apt-get update
sudo apt-get install minicom gpsd gpsd-clients

If you have not restarted before, this must be done now at the latest

sudo reboot now

Now everything should be ready and the module ready for the test. In addition, we inform the module that it should work with a baud rate of 9600:

stty -F /dev/ttyAMA0 9600

In this case, no (error) message should occur. Afterwards, we can have the current configuration output:

stty -F /dev/ttyAMA0

You start with the first test

minicom -b 9600 -o -D /dev/ttyAMA0

Here the baud rate, as well as the device is indicated (with CTRL + A, Q you finish). The list is a bit confusing, but it works well if only the raw data is needed.
To get a better look, we start gpsd. Again, we have to specify the baud rate

sudo gpsd /dev/ttyAMA0 -F /var/run/gpsd.sock -n

before we can start:

cgps -s

Raspberry Pi GPS Modul - gpsd

Make sure that the reception to the GPS satellites can be made, so go outside, or at least to a window. Where the reception in the house tends to be good, you can test with your phone.

One Response

  1. Hello! Thanks for the guide! How would I send data collected from this sensor to the Azure IoT Hub?

    Reply

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