Hello All. In this post, I will explain how to use SIM900 Arduino GPRS/GSM shield with Raspberry Pi3 to make calls or send messages.

Hasan Men

Hello All. In this post, I will explain how to use SIM900 Arduino GPRS/GSM shield with Raspberry Pi3 to make calls or send messages.

Prerequsites:

Enable RPi serial interface
```
  sudo raspi-config
```
Go Interfacing section and disable serial login and enable hardware serial.
Disable or change bluetooth uart bus to use uart pins. Add dtoverlay settings to config file.
```
  sudo nano /boot/configs.txt
```
Disable or change to miniuart.(Please add one of these-disabling is better)
```
  dtoverlay=pi3-miniuart-bt
  dtoverlay=pi3-disable-bt
```

Update /boot/cmdline.txt file to use UART for shield. Delete console=ttyS0/ttyAMA0… or console=ttyS0/ttyS0… text.
Old

  dwc_otg.lpm_enable=0  console=tty1 root...

New

  dwc_otg.lpm_enable=0  console=tty1 console=serial0,115200 root=PARTUUID...

Connect RPi RX/TX to Shield RX/TX and enable HW Serial from Shield
Run the source code
```
  sudo python3.5 SIM900.py
```