Xronos Clock is open source. Here you will find manuals and all technical data including hardware schematics and PCB layout as well as source code, latest firmware and other related software

Technical Specifications


Brains ATMega644p Microcontroller @ 16Mhz (or ATmega1284p for V2 w/ radio)
Storage 256MB microSD Card
Audio 22Khz 16-bit Mono uncompressed WAV
Display 32×16 Red/Green LED matrix (capable of producing 3 colors: RED, GREEN and Orange)
Buttons 3x 24mm Arcade
Time Chip DS1307 based RTC w/ LIR2032 battery
Temperature sensor Digital DS18B20 (-55°C to +125°C)
RF Transiever RFM12B (915 Mhz or 434 Mhz) only available in V2 as option
USB Programming w/ optional FTDI adapter/cable (not included)
Power Supply 6-12 VDC (positive tip)
Power usage 1-3Watt (aprox., depends on Color and Brightness)
Dimentions 7.5″ x 4.75″ x 3.75″ (aprox)
Weight 1 lb 8 1/4 oz (687g) w/o external Power supply

Manual, and Schematics

Board Connections diagram


Firmware, software and source code

Firmware zip files include batch script . You will also need AVRDude for which I provided link in the “Libraries and Utilities section”.

Latest Firmware (2_06) . Works only with ATmega1284 based clocks (all latest clocks).

Previous Firmware (2_04_04) Universal . Works for versions of Xronos Clocks (you’ll be asked pick your version while updating). Includes RF and IR versions.

Latest Source Code/Arduino Sketch V2_06

Old Source Code/Arduino Sketch V2_04_03 (backwards compatible with Xronos Clock V1!)

Experimental Temp/Humidity sensor source code (works with Moteino R2)

Firmware zip files include batch script. You will also need AVRDude for which I provided link in the “Libraries and Utilities section”.

Latest Firmware (2_04_04) Universal. Compatible w/ V1, please use this one instead of 1.6

Firmware 1.06 (Not recommended. Use V2.02_01 instead.)

You don’t need any of the below if you only want to upload firmware and have no plans to tweak source code. I will attempt to include original source for all the libraries and platforms, however since they were written to work with original Arduino,  some were slightly modified (mostly by myself) to work with ATMega644p and ATMega1284p microprocessor.

AVRDude for Windows (if you have Arduino IDE it already comes with AVR inside hardware\etc\ folder)



Hardware Platform Files