An Easy Door Bell with Arduino Uno

Making music with a microcontroller can be fun and simple! For this project, we're using a pushbutton to trigger a melody played over a piezo speaker, à la Kraftwerk, Pocket Calculator. I'm sure you remember how it goes, "by pressing down a special key it plays a little melody" (Karl Bartos, Ralf Hütter, Emil Schult, © Sony/ATV Music Publishing LLC, Warner Chappell Music, Inc.). The model here is more a faithful representation of a basic door bell, rather than a calculator. Simply push a button and a chime or melody will play.

For this project you will need:
1x Arduino Uno R3 microcontroller
1x breadboard
1x piezo speaker
1x pushbutton
1x resistor (10kΩ)
several jumper wires

Assemble the circuit in accordance with the diagram below:

Image: Nate Stottlemyer

Here's the code for you to hack (view content in browser to see code example). Lines 13 through 20 make up the melody. After each tone() function is called, a delay() function is used to determine the duration of the tone.

Try creating your own melody and have fun!