Last few days I had tried my hands on working with GSM module with Raspberry PI 3. I had Raspberry PI 3B device on which I have used SIM 800 module having RPI GSM ADD-on V2.3. My PI device have native Raspbian buster as OS. Trying set up the SIM with the GSM module take bit of time connect to internet. I am using an Airtel 4G SIM for internet connection I need to search a bit on Google to set up the GSM module for an active internet connection and start browsing. Listing here the steps I have used.
Hardware Used:
1.
Raspberry PI 3 B
2.
GSM module SIM 800
3.
Airtel SIM
4.
7”” inch Waveshare LCD for display
5.
USB charger for (5V 1 amp for Raspberry PI)
6.
Two additional USB charger for power supply to
GSM Module and LCD)
7.
Keyboard and mouse
Connection: Put the SIM in the SIM holder of the GSM
module. Place the GSM module on top of Raspberry PI using 32 pins. Connect the LCD to raspberry pi using the cable
APN SET UP: All of you must know what APN is. It is access
point name of your operator. Since I have used an Airtel SIM, I know the APN
name. It is airtelgprs.com. If you have a different operator you, please note
the APN that we will later use for setting PPP configuration.
PPP Configuration and installation: PPP stands for point
to point protocol, which basically used for node to node communication using
serial interface in PC. We will use PPP and serial connection to access
internet in Raspberry pi.
To install PPP software, open the terminal. Enter the
following two commands one after another.
sudo apt-get update
sudo apt-get install ppp screens elink
After successful installation of PPP software, you need to
setup PPP peer configuration. For this we need login as root. By default, in raspberry
pi you logged in as default user pi. At least in my case I had logged in as
user pi. So, to log in as root user type the following command on the terminal
and enter.
sudo -i
After logging in as root use cd command as shown below to
move peers directory.
cd /etc/ppp/peers/
Now create a new file and name it anything you like and
remember the name. Use any editor you want. I have used nano editor as shown
below to create a file called airnet
sudo nano airnet
Enter the following text as shown below.
#airtelgprs.com is the APN for Airtel connection. Note in
the above line put APN name of your operator after -T.
connect "/usr/sbin/chat -v -f /etc/chatscripts/gprs -T airtelgprs.com"
# For Raspberry Pi3 use /dev/ttyS0 as the communication
port:
/dev/ttyS0
# Baudrate
115200
# Assumes that your IP address is allocated dynamically by
the ISP.
noipdefault
# Try to get the name server addresses from the ISP.
usepeerdns
# Use this connection as the default route to the internet.
defaultroute
# Makes PPPD "dial again" when the connection is
lost.
persist
# Do not ask the remote to authenticate.
noauth
# No hardware flow control on the serial link with GSM Modem
nocrtscts
# No modem control lines with GSM Modem
Local
There are few other parameters available for setting up the
configuration and you can try those. But the above lines are sufficient for the
configuration Now save the file and close it
Edit cmdline.txt file:
Now use the following
command to edit the cmdline.txt in the boot directory.
sudo nano /boot/cmdline.txt
Remove all reference to console in this file as shown below
Before Edit: dwc_otg.lpm_enable=0 console=tty1
root=PARTUUID=07312df9-02 rootfstype=ext4 elevator=deadline fsck. repair=yes
rootwait quiet splash plymouth.ignore-serial-consoles
After Edit: dwc_otg.lpm_enable=0
root=PARTUUID=07312df9-02 rootfstype=ext4 elevator=deadline fsck.repair=yes
rootwait
Edit hciuart.service file: Apart from changing cmdline.txt
file we need some minor change in the hciuart.service file in the /lib/system/system
folder using below command.
Sudo nano /lib/systemd/system/hciuart.service
Use “#” to comment out the line having below text.
After = dev-serial.device
Execstart = /usr/bin/bt-uart
Add the new line shown below.
Execstart = /usr/bin/hciattach/dev/ttyS0 bcm43xx 460800
noflow-
Save the file and close the editor
Edit config.txt file: Open the config.txt file using any editor. I
have used the following command to edit config.txt
sudo nano /boot/config.txt
Add the following lines at the bottom of the config.txt file
and save the file
dtoverlay=pi3-miniuart-bt
enable_uart=1
force_tourbo=1
Check Connection
Run ifconfig command from terminal to check connection type
available on your raspberry pi. You will find “eth”, “lo” and “wlan”. Now type
the following command on the terminal to create a new connection
sudo pon airnet.
Now again run the ifconfig command on the terminal. Now you
will see a new section called PPP0 with an IP address. Your network LED will
blink quickly and continuously on your GSM module showing the connection is on.
Now you can open your web browser in your raspberry pi 3 device
and browse websites.
If you want to disable or close the PPP connection, use the
following command.
sudo poff airnet
Refernce:
1. https://www.instructables.com/id/Raspberry-Pi-With-a-GSM-Module/
No comments:
Post a Comment