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Return to BlogCreating the Soundwave MP3 Device
Posted Feb 09, 2012 at 10:32 am
Figure 1
Recording audio at specific times and storing it as an MP3 file into a compact Flash memory are the main functions of the Soundwave MP3.
The project illustrates the use of ATA interface and the use of FAT to access files. Also featured are the proper ways to access, through the I2C bus, the PCF8574 and MAS3587F. The actual audio is provided by using a small FM radio along with an LCD panel for displaying the program information. In order to synchronize the program information with a PC, the serial RS232 port allow the possibility of programming. The pushbuttons represent the user interface for basic playback and for the recording times to be programmed.
The compact Flash was chosen to be the storage medium since it is very useful due to its very low power consumption, which is a good feature for a recording application as it saves the battery from often charging. A 9V AC adapter is used to provide 9VDC for the power interface. The LM317 regulators provide. The MP3 chip, compact Flash, LCD display, and CPU, share the main 8-bit data bus where all signals are controlled by the CPU.
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