RasithaGamage / Raspberrypi_SIM900

Generate automatic voice calls with a Raspberry pi and SIM900 GSM module

Raspberrypi_SIM900

Generate automatic voice calls with Raspberry pi and SIM900 GSM module

USED COMPONENTS

Raspberry Pi 3

SIM900 Arduino GSM shield

USB TTL converter (CH340G)

AUX cable

Setting up hardwares

USB TTL converter is used to transmit data between RPI3 and SIM900

Audio OUT of the RPI3 is connected to Audio IN of SIM900

Install minicom and check the GSM module with some ATcommands to ensure the right connection

1. sudo apt-get install minicom
   • check: https://www.tldp.org/HOWTO/Remote-Serial-Console-HOWTO/modem-minicom.html
2. Enable CLCC
• AT+CLCC=1
3. making a call
• AT
• ATD +9471XXXXXXX;

Configuring RPI3

sudo apt-get install mpg321

sudo pip install pathlib

sudo pip install gTTS

sudo apt-get install alsa-utils

sudo apt-get install alsa-oss

How to run python program

Change directory to the location where python script exists

Run: sudo python call.py +9471XXXXXXX "your message"

Note: Voice was too noisy at first, as the solution, GSM module powered using an external power supply. Then ground pin of GSM module is connected to RPI ground and eventually annoying noise got removed.