The Tone Generator module allows you to use a Circuit Playground Bluefruit as a simple monophonic synthesizer.
- Press a key on the piano keyboard at the bottom to play a corresponding note on the CPB's built-in speaker.
- Try pressing keys in sequence to perform a song.
Frequency values
The Tone Generator's keyboard can play notes C4 through G5. Below, you can see the frequency values for each of the included notes.
| Note | Frequency(Hz) | Wavelength(cm) |
| C4 | 261.63 | 131.87 |
| C#4/Db4 | 277.18 | 124.47 |
| D4 | 293.66 | 117.48 |
| D#4/Eb4 | 311.13 | 110.89 |
| E4 | 329.63 | 104.66 |
| F4 | 349.23 | 98.79 |
| F#4/Gb4 | 369.99 | 93.24 |
| G4 | 392.00 | 88.01 |
| G#4/Ab4 | 415.30 | 83.07 |
| A4 | 440.00 | 78.41 |
| A#4/Bb4 | 466.16 | 74.01 |
| B4 | 493.88 | 69.85 |
| C5 | 523.25 | 65.93 |
| C#5/Db5 | 554.37 | 62.23 |
| D5 | 587.33 | 58.74 |
| D#5/Eb5 | 622.25 | 55.44 |
| E5 | 659.25 | 52.33 |
| F5 | 698.46 | 49.39 |
| F#5/Gb5 | 739.99 | 46.62 |
| G5 | 783.99 | 44.01 |
