Introduction: Add 3G to the Raspberry Pi: PiloT Tutorial
The following instructions are based on use of Raspbian Jessie OS.
The PiIoT is a WAN communications board which provides a 3G / HSPA wireless interface for the Raspberry Pi.
Step 1: Install Minicom Using the Following Code:
sudo apt-get install minicom
To redirect the system console and stop login prompts being sent over the serial port, enter:
Then go to Advanced options > Serial > answer 'No' > click 'OK'
Tap to finish
Click 'Yes' to reboot
Tap the right arrow twice and press 'enter' to finish.
Step 2: PiloT Power Supply Control
The PiloT power supply is controlled by a Raspberry Pi IO pin. A logic “1” output enables a power supply regulator which supplies the PiloT with power. Note that the regulator may switch on by default when power is applied to the Raspberry Pi.
Step 3: PiloT HL Module ON/OFF Control
The PiloT module ON pin is used to turn on the HL module’s internal power supply.
The PiloT module ON pin is GPIO21 on the Raspberry Pi. The HL module will automatically power on when the PiloT power supply powers on. Once the module is powered off, the ON pin will need to be pulsed to turn the module back on again. To power on, insert the following commands:
gpio –g mode 6 out
gpio –g write 6 1
gpio –g mode 21 out
gpio –g write 21 1
gpio –g write 21 0
Step 4: Connecting to the PiloT Via a UART Port
To enable handshaking on the serial port, enter the following commands:
gpio –g mode 16 ALT3
gpio –g mode 17 ALT3
You are now able to use AT commands to communicate with the HL module on the PiloT.
For a full list of AT commands for the Sierra Wireless HL modules, visit the Source. To use AT commands, open a Minicom session by entering the following:
minicom –D /dev/ttyAMA0
Check the AT commands are working by typing ‘AT’ and pressing enter.
This should return ‘OK’.
Exit Minicom (Ctrl A then X > enter).
Step 5: Connecting Via USB
USB interface provides several USB endpoints to the Raspberry Pi. These can be set using the AT+USBCOMP command. Serial endpoints can be seen by typing the following:
This should show USB serial endpoints, as shown in the image above.
A serial session can be instigated using the command below:
minicom –D /dev/ttyACM0
Step 6: Using IP
Using Minicom, enter the following command, which changes the USB end points to provide a CDC ECM interface:
Close Minicom (Ctrl A then X > enter), then power cycle the Raspberry Pi by removing and reinserting the power cable.
Within a Raspberry Pi shell session, enter the following command:
This should show ACM0 end points, as seen in the picture above.
A new Ethernet device should appear in the reported list. On a Raspberry Pi 2, this should be ‘eth1’.
Edit the interface configuration file:
sudo nano /etc/network/interfaces
Change or add the entry for eth1 as follows:
iface eth1 inet dhcp
pre-up ifconfig $IFACE down
dns-nameservers 22.214.171.124 126.96.36.199
Save the file by holding Ctrl A + X
Press ‘Y’ Then ‘enter’.
Configure the HL8 bearer APN by opening a Minicom session to/dev/ttyAMA0 or /dev/ttyACM0, then entering the following command using the appropriate APN according to your selected network:
AT+CGDCONT=1,“IP”,“Access Point Name”
Configure the APN username and password:
Configure dynamic DNS request:
To start an IP session:
To stop an IP session:
Step 7: Power Off
To power off the PiloT, open a Minicom session with /dev/ttyAMA0 or /dev/ttyACM0.
Power off by entering the following command:
Step 8: Using GPS
If you have the HL8548-G variant of the PiloT, you are able to access location and time information using the PiloT's on-board GNSS solution.
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