To connect a GPS module with four wires (RST, TX, VCC, and GND) to a Raspberry Pi 4, follow these steps:
Materials Needed:
1. GPS module with RST, TX, VCC, and GND pins
2. Raspberry Pi 4
3. Jumper wires
4. Breadboard (optional, for easier connections)
Steps:
1. Identify the Pins on the GPS Module:**
- RST: Reset pin (might not be used in a basic connection)
- TX: Transmit pin (sends data to the Raspberry Pi)
- VCC: Power supply pin (typically 3.3V or 5V)
- GND: Ground pin
2. Connect the GPS Module to the Raspberry Pi:
- VCC to 3.3V or 5V: Connect the VCC pin of the GPS module to the 3.3V or 5V pin on the Raspberry Pi. Refer to your GPS module's datasheet to determine the correct voltage.
- GND to GND: Connect the GND pin of the GPS module to one of the GND pins on the Raspberry Pi.
- TX to RX (GPIO15): Connect the TX pin of the GPS module to the RX pin (GPIO15, physical pin 10) on the Raspberry Pi.
3. Configure the Raspberry Pi:
- Boot up your Raspberry Pi and open a terminal.
- Disable the Linux serial console to free up the serial port for the GPS module. Edit the `cmdline.txt` file:
sudo nano /boot/cmdline.txt
Remove any reference to `serial0` or `ttyAMA0`. Save and exit.
- Edit the `config.txt` file to enable the serial port:
sudo nano /boot/config.txt
- Add the following lines at the end of the file:
enable_uart=1
dtoverlay=pi3-disable-bt
-Save and exit.
- Reboot your Raspberry Pi:
sudo reboot
4. Install Necessary Software:
- Install `gpsd` and `gpsd-clients` to read data from the GPS module:
sudo apt update
sudo apt install gpsd gpsd-clients
- Configure `gpsd` to use the serial port:
sudo nano /etc/default/gpsd
Modify the file to look like this:
START_DAEMON="true"
GPSD_OPTIONS="-n"
DEVICES="/dev/serial0"
USBAUTO="false"
GPSD_SOCKET="/var/run/gpsd.sock"
Save and exit.
- Restart `gpsd`:
sudo systemctl restart gpsd
5. Test the GPS Module:
- Connect to the GPS module using `gpsmon`:
gpsmon /dev/serial0
- Or you can use `cgps` to get a simpler display:
cgps -s
You should now see data from the GPS module being displayed in the terminal.
Additional Notes:
- If the GPS module does not work, double-check all connections and ensure the GPS module is getting the correct voltage.
- Some GPS modules might require a specific baud rate. You can set this using the `stty` command:
stty -F /dev/serial0 9600
Replace `9600` with the baud rate required by your GPS module.
By following these steps, you should be able to successfully connect and communicate with a GPS module using your Raspberry Pi 4.
73 de Zaki 9M2ZAK
