Surilli GSM Board – SIM800H with ATmega32u4


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Surilli GSM Board with SIM800H & ATmega32u4 8-bit Microcontroller:

This is the Surilli GSM. Silverback takes on an ‘all-in-one’ Arduino-compatible audio/SMS/data capable cellular with built in USB and battery charging. Surilli GSM with a SIM800H module is ready to rock. At the Surilli GSM, heart is at ATmega32u4 clocked at 8MHz and at 3.3V logic. This chip has 32K of flash and 2K of RAM, with built in USB so not only does it have a USB-to-Serial program & debug capability built in with no need for an FTDI-like chip, it can also act like a mouse, keyboard, USB MIDI device. Since you will be taking this on the road, added a connector for any of the 3.7V Lithium polymer batteries and built in battery charging. A 500mAh Lipoly battery is required for use, it keeps the cellular module happy during the high current spikes. Plug the Surilli GSM into laptop to charge at 500mA.


Here’s some handy specs! Like Surilli GSM you get:

  1. Measures 71.90mm x 23mm x 7mm without headers soldered in
  2. Light weight- 9.2 grams
  3. ATmega32u4 @ 8MHz with 3.3V logic/power
  4. 3V regulator with 500mA peak current output
  5. Native USB support, comes with USB bootloader and serial port debugging
  6. GPIO pins – 20 GPIO pins
  7. Hardware Serial, hardware I2C, hardware SPI support
  8. 8 x PWM pins
  9. 10 x analog inputs
  10. Built in 500mA lip/Poly charger with charging status indicator LED
  11. Pin #13 red LED for general purpose blinking
  12. Power/enable pin for the 3.3V regulator
  13. 4×2 power pins header
  14. 2 mounting holes
  15. Reset button

Connect your Surilli GSM to the Internet or make phone calls with our trusted-and-tested GSM module. GSM cellular module (we use the latest SIM800H) the size of a postage stamp. This module can do just about everything.

  1. Quad-band 850/900/1800/1900MHz – connect onto any global GSM network with any 2G SIM
  2. Make and receive voice calls using an external 8ohm speaker electret microphone
  3. Send and receive SMS messages
  4. Send and receive GPRS data (TCP/IP, HTTP, etc.)
  5. Scan and receive FM radio broadcasts (yeah, we don’t exactly know why this was included but it works really well)
  6. AT command interface with “auto baud” detection
  7. Pair-able Bluetooth client interface with SPP (for controlling the module) as well as audio.


You will also need some required accessories to make Surilli GSM work. These are not included!

  1. 2G SIM Card
  2. Lipo Battery– 500mAh or larger!
  3. External Mic & Speaker– If you want to make phone calls, you’ll also need electric mic and mini 8 ohm speaker
  4. Anteena



Surilli GSM Datasheet


Online Surilli Tutorials at Hackster

Example Project :


Online support through