We go over the basic operation of out Growduino system, what is an RTC and why we need one for this project, and learn how to program an Arduino to schedule when to turn on and off the watering system.Problem: An Arduino's memory is wiped when it loses power. For most of our projects, that doesn't matter b/c we're only using the Arduino as a momentary I/O controller. However, when we have a project that needs to be persisten, we need a way to keep time even when the Arduino is powered off. Segment Summary: We're going to connect a Tiny RTC to an Arduino. Parts: 1. Tiny RTC I2C DS1307 Real Time Clock ~$1.50 2. Arduino 3. Jumper Wires Tools: 1. Soldering Kit What is I2C? * I2C (Pronounced "I Squared C") can communicate with multiple devices over short distances with just two wires: SDA (Data Line) & SCL (Clock Line) * Technically, it's a "Multi-Master, Multi-Slave
