Some useful Arduino libraries: http://rweather.github.io/arduinolibs/index.html
Includes:
- LED blinking library that doesn’t use delay() (which means you can use that time for something else)
- DS1307 and DS3232 I2C Real Time Clock support (including alarms support for the DS3232)
I’m also starting a GitHub project for command-line Arduino, based on various projects around the place: https://github.com/AlexSatrapa/Arduino
My current project is to get DS3234 support for the “Arduinolibs” RTC library. The DS3234 is very similar to the DS3232 except that it uses SPI rather than I2C to communicate. The DS3234-into-RTC thing is a side tour from my pneumatic water level sensor project.