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HAT module GSM/GPRS/BT for Raspberry-Pi

  • SIM800C (GSM/GPRS)
  • 2G,
  • Bluetooth support (earphone)
  • Antenna sticker
€41.90 (tax incl.) €34.63 (tax excl.)
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A 2G GSM board for your Python applications, Scratch, Internet connection on Raspberry-Pi

Who has not dreamed for placing a Pi Zero/Raspberry-Pi in his country house to receive , at regular intervals, telemetry information and event occurring at a distance.

Need to send an SMS during an intrusion attempt or create an SMS sending server?

For that matter, why not send an email, photos, FTP transfer, communicate data MQTT from a remote place with no WiFi, no internet connection,... In short, lost in the middle of nowhere without anything but a source of electricity (or a battery) and the GSM network.

Look no further, you have just discover the ideal product for this type of activity... the HAT NADHAT GSM to pair with your Raspberry-Pi (or the future PYB405 under MicroPython).

Détails de la carte NadHAT GSM

The NADHAT board is equipped with a SIM800C module for 2G network (network promised to stop for a long time but still very active both in France and Belgium). Thanks to the NadHat GSM, it becomes possible to make internet connections via the GSM network (so-called ppp connection), send/receive SMS by exploiting AT commands, create an SMS server (see tutorial), use Python code to control the board (see the GitHub NadHat). 

NadHat GSM works using the serial port available on the GPIO of Raspberry-Pi (/dev/ttyAMA0, 115200 bauds, 8N1).

The NadHat GSM already includes an antenna. If you need a more sensitive antenna, you could have a look to that +3dB multi-band antenna.

Bluetooth Support:

Advanced users will be able to enjoy the SIM 800c Bluetooth support. The SIM800c can only act as a Bluetooth earphone. Only Bluetooth profiles SPP, OPP et HFP/HSP (partial). For more information, see the document "SIM800 Series _Bluetooth_ Application Note" in the NadHat data sheets. If you want to test the Bluetooth support, it will be necessary to have a µFl to RP-SMA cable and a WiFi antenna.  


This product requires a SIM card to work! SIM card previously registered on the mobile network. Depending on the operator, it is sometimes necessary to make a first call from a Mobile/GSM/Smartphone in order to activate the SIM card on the module network.

A Bluetooth antenna with µFl connector is required for the Bluetooth interface. You can use the  kit antenne WiFi, Bluetooth, LoRa antenna kit or RP-SMA to µFl connector with your own antenna. Warning, using the board without antenna will dammage the board.

A 5V power supply capable of developing 2.5A without flinching will also be necessary (example: Raspberry-Pi 2.5A power supply).


For each order, you'll receive an assembled and tested NadHat GSM v1 board, an µFL sticker antenna, the fastenings to fix the board on your Pi (screw, spacer, nut), 40-pin connector to weld on the GPIO, a CR1225 battery. Notice available in French and English. 

The GPIO connector must still be welded to the board but it should not take more than a few minutes. Note that you can replace your female GPIO connector with a Stacking Header in order to add other HATs. 

Raspberry-Pi, SIM card, power supply not included. You will probably find your happiness in the range Pi Zero, Raspberry Pi 3 or Raspberry Pi 4.

On video

You can discover the NadHat video on the following links:

Technical details


This board produced by Garatronic France benefits from excellent documentation in French online.

To discover also, this excellent article of discovery on the NadHat published on the site of Framboise314

Data sheet
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