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RELATED GUIDES

FEATURED
Capacitive Touch Drum Machine
Sick beats, dog.
by Todd Treece
Learn how to make a simple MIDI drum machine using an Arduino Leonardo, a MPR121 Capacitive Touch shield, and NeoPixels!
Circuit Playground Password Vault
Turn your Circuit Playground into a USB password vault
by John Park
Long, random passwords are the most secure, but can be difficult to remember and tricky to type. Build this Circuit Playground Password Vault to remember and enter them for you! Store up to ten passwords and enter them into a computer over USB at the push of a button. You'll even create a unique unlock sequence so your passwords stay secure, and build a rugged 3D printed case to take it on the go.
Circuit Playground PZ-1: Pizza Box DJ Controller
Make a DJ controller from conductive paint, cardboard, and a Circuit Playground!
by John Park
Make your own PZ-1 MIDI pizza box DJ controller using a Circuit Playground, which speaks MIDI directly to your software, such as Traktor, Mixxx, and others. With a stencil and conductive paint you'll create a delicious controller layout.
NEW
I2C addresses!
I2C addresses from 0x00 to 0x7F (inclusive)
by lady ada
I2C is incredibly popular because it uses only 2 wires, and like we said, multiple devices can share those wires, making it a great way to connect tons of sensors, drivers, expanders, without using all the microcontroller pins. The only bad news about I2C is that each I2C device must have a unique address - and the addresses only range from 0 to 127 (aka 0 to 0x7F hex). Since we deal with so many I2C devices we thought it would be handy to have a table with all the most common sensors and modules we encounter, and their I2C address!