gion86/ds1307_rtc

DS1307 Real time clock library for the ATTiny85 (ATTinyX5)

DS1307_RTC

DS1307 Real time clock library for the ATTiny85 (ATTinyX5).

Features:

• system time support, with external reference available
• time library patched for time drift correction
• system time clock even when the micro is the sleep period (POWER_DOWN) and the internal millis() timer is off (with RTC)
• changes to save space for ATTiny85 micro.

The sensor actually communicate with micro via I2C protocol: the implementation supported is only TinyWireM [http://playground.arduino.cc/Code/USIi2c] , to save code space on the ATTiny MCU.