Written by Wim Looman & Henry Jenkins Contact either [email protected] or [email protected]

All code is under GNU GPL

A Jukebox based on the ENEL353 Assignment at University of Canterbury, New Zealand

Taken from handout: This project requires the use of a small speaker driven by an audio amplifier and interfaced to a microprocessor. The microprocessor will store one of several “tunes”. On demand the embedded system will play a selected tune through a digital to analogue converter (DAC), pre-amplifier, amplifier and speaker. Each “tune” will be kept in a table in memory and a selection made from the keypad. A human-interface using a 7-Segment LED display will be required to prompt the user for a song. Waveform data can be generated using a spreadsheet program such as Excel, or a mathematical tool such as MATLAB. These data will be stored in memory and output to a digital-to-analogue converter for amplification, and ultimately heard by users as musical sequences. Monotone sequences are sufficient for this project, however polymorphic tones (use of harmonics) are encouraged.

Bill of Materials Component Quantity AT91SAM7s256 MCU x1 MAX550 DAC x1 TL071 OP-AMP x1 LM386 Audio Amplifier x1 .2W loud Speaker x1 4-Digit 7-Segment Display x1 LED, Green x1 LED, Red x1 BC557 Transistor x6 4x4 Keypad x1 Various Resistors ∼ x20