There are six functional buttons on the board:
- “REC” button, to start or stop the microphone recording
- “PLAY/STOP” button, to playback the recorded sound
- “BACK” button, to jump to previous sound data
- “FORWARD” button, to jump to forward sound data
- “ERASE” button, to erase sound data
- “USER” button, reserved for users
Figure 1. Buttons
| Button Name | I/O Pin |
|---|---|
| REC | PB4 |
| PLAY/STOP | PB5 |
| BACK | PB6 |
| FORWARD | PB7 |
| ERASE | PA7 |
| USER | PC5 |