Small MP3 Player Known as EchoMP3

A PIC18LF452 microcontroller is the basis of building this project together with VS1001K MP# decoder chip to create a small MP3 player with great functionalities.

The EchoMP3 supports FAT16 and FAT32 file system and for file storage, it makes use of MMC and SD cards that comes in 64, 128, 256, 512MB and 1, 2, 4BG sizes. Due to the serial interface with the MMC, the PIC18Fl452 has to run at 20MHz and a quarter of ROM-space for additional applications is still available. The whole circuit is powered by MAX1674 DC-DC step-up converter which takes it source from a single AAA battery which is initialized using an ON/OFF pushbutton. This shows low power operation from 1V2 Ni-Mh battery.

For the display, the Nokia 3310 LCD LPH7779 was used wherein the contrast can be adjusted by the user. The Artist and Song Title are on the first 4 lines while the song number and elapsed time are on the fifth line. The sample rate, bitrate, and total song time are shown in line 6. There are 8 user controls available by using the micro joystick for volume, track, pause/play, skip, and directory scrolling.

Rest of the project