Wave audio player using PIC16F887 microcontroller
This small project shows how to make a simple wave audio player using PIC16F887 microcontroller and SD card. The WAV audio file used in this project is 8000 Hz, 8-bit stereo (2 channels).
- PIC16F887 microcontroller
- SD card (formatted with FAT16 or FAT32 file system)
- ASM1117 3.3 voltage regulator
- Audio amplifier (ex: PC speaker, LM386 ……)
- 20 MHz crystal oscillator
- 2 x 22pF ceramic capacitors
- 3 x 3.3K ohm resistor
- 3 x 2.2K ohm resistor
- 10K ohm resistor
- 2 x 1K ohm resistor
- 3 x 10uF polarized capacitor
- 100nF ceramic capacitor
- 5V Power source
- Jumper wires
The microcontroller generates audio using PWM technique, if the wave audio file is mono (1 channel) the microcontroller will generate only 1 PWM signal (PWM1) and hence we will hear the sound from 1 speaker only. If the wave audio file is stereo both speakers will give sound.
In this project the PIC16F887 runs with 20MHz crystal oscillator which is the maximum speed of this microcontroller, MCLR pin function is disabled.
The C code:
The C code below was tested with CCS C compiler versions 5.051.
In this project I used the FAT library (FAT16 and FAT32), its source file can be found in the the following topic:
SD card FAT library for CCS C compiler
I tested this project with FAT32 8 GB and FAT16 2 GB micro-SD cards.
The name of the wave audio file which I used was mywav (mywav.wav with the extension), its sample rate is 8000 Hz with 2 channels (stereo).
First of all I initialized the SD card using the function: sdcard_init(); this function return 0 if the initialization was OK and non-zero if there was an error. After the initialization of the SD card I initialized the FAT file system using the function fat_init(); and then I opened the wave audio file with the pre-selected name mywav.wav, all the three previous function returns 0 if OK and no-zero if error.
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