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Sniffer Nano Firmware v1.1 AND Door Controller

The Sniffer Nano Firmware is update to v1.1, and it’s patched by Flemming Frandsen.

Flemming Frandsen is a Danish designer who bought our product, he found that the Sniffer Nano source code is not easy to read and written in a completely different style than what he was used to, so this guy do a great job to modify the code and make some significant improvement:
  • Cleaned up the code a bit
  • Converted to using a bit array to save 7/8 of the RAM

Download the Source code here:

  SnifferNano Firmware v1.1 (2.7 KiB, 1,370 hits)

He not only improved the software but also change some hardware design to make a better reading effect.

Above is a door controller which made by Flemming Frandsen :
  • ATmega168 (easier to get than ATmega328, but with less EEPROM)
  • Ethernet controller (ENC28J60) + RJ45 transformer
  • 12V / 3 A switch mode buck converter (passive PoE 15-30 V)
  • 3.3V / 800 mA linear regulator (fed by 12V)
  • 2x 10A relay outputs with an indicator LED
  • 3x RJ45 connector (with LEDs) for Keyboard, RFID and lock
  • Protection Diodes to GND and 3v3 ,all GPIO pins brought out to the RJ45 connector
  • Standard 6 pin ICSP header
  • 6 pin FTDI header
  • 6 pin serial IIC + power header

You can find the RFID which basis on Sniffer Nano, but Flemming Frandsen made some change on it to get a better reading effect :

  • The DC-blocking C3 capacitor has been changed to 100nF.
  • The amplifier got a higher gain and a 1 nF capacitor in the
  • Inverting feedback to cut down on the carrier wave.

The Schmitt trigger was changed out completely to a traditional coupling, but with an automatic threshold voltage via an RC filter.

Download the whole schematic of this door controller here:

  Door Controller schematic (115.5 KiB, 1,083 hits)

You can get more detailed information about this door controller on Flemming Frandsen’s site:


If you can read the Danish, join this post: http://www.hackaarhus.dk/forum/viewtopic.php?f=4&t=90