Working with the DS1307 Serial Real-Time Clock using the USITWIX library for I2C / TWI on Atmel ATtiny85 / Tinusaur.
Source code available at: https://bitbucket.org/tinusaur/ds1307tiny
Specs: https://www.maximintegrated.com/en/products/digital/real-time-clocks/DS1307.html
