Connect SIM800C SMS Module to a Raspberry PI

This is video 1 of a tutorial on how to send and receive SMS using a SIM800c Module and a Raspberry Pi.

1. Wiring : https://youtu.be/tmD9svuY0Kc
2. Receive SMS : https://youtu.be/J4QoeTLoL4U
3. Send SMS : https://youtu.be/_jWyjmJLjyE

I show how to connect a SIM800C V2 Module to a Raspberry PI

Set the wiring between the RPi and Sim800C Module as
RPi 5V ←→ SIM800C VCC_IN
RPi GND ←→ SIM800C GND
RPi GPIO14 (TXD) ←→ SIM800C RXD
RPi GPIO15 (RXD) ←→ SIM800C TXD

On the RPi you will need to disable the login shell over serial and enable serial through GPIO.

On Rasbian OS, open a terminal prompt,
# sudo raspi-config
Select Option 'Interfacing Options'
Select Option 'Serial Port'
For Question 'Would you like a login shell to be accessible over serial?' answer 'No'
For Question 'Would you like the serial port hardware to be enabled?' answer 'Yes'
'Finish' raspi-config and reboot the Pi for changes to take effect.
# sudo reboot now

Log back into the RPi, and install minicom
# sudo apt install minicom
Now to open minicom and connect.
Depending on your version of RPi, (video is 3) I connect to ttyAMA0.
On RPi4 I could connect using ttyS0 instead, so if ttyAMA0 freezes minicom, then try ttyS0
# sudo minicom -D /dev/ttyAMA0 -b 115200
or
# sudo minicom -D /dev/ttyS0 -b 115200

type AT and then press [ctrl-m] for the carriage return.
Then ATI then press [ctrl-m] and you should get the response similar to
SIM800 R14.18

Visit https://www.raspberrypi.org/documentation/configuration/uart.md for more info about RPi UART configurations.

SIM800c : https://amzn.to/3mYOh4p
RPi Store : https://amzn.to/2G0rN2z

0:00 Connect SIM800C Module to a Raspberry PI
1:00 Show Wiring Diagram
2:05 Configure UART on Raspberry Pi
3:40 Install minicom
4:00 Connect to SIM800c using minicom

#sms
#smsModule
#sim800c