Circuit Diagram:
For those who want to build it on their own breadboard or other platform, here is the electronic scheme built in Eagle Cad, free version:
Software:
Here is the C program written for MikroC PRO for PIC 2010 (version v4.15).
/*
'*******************************************************************************
' Lesson nr.20:
' Sound generation.
' Done by:
' Aureliu Raducu Macovei, 2010.
' Description:
' In this experiment we will work with sounds.
' I'll show how to generate and make sound helped by microcontroller
' and some buttons.
' Communication with the buzzer will be performed at PORT RB3 ( as PWM mode).
' The Push buttons are connected to PORT RA4 (generates Tone1), RA6
' (generates Tone2) and RA7(generates melody2).
' Of course we need pull-up resistors (4k7 is required).
' Test configuration:
' MCU: PIC16F628A
' Test.Board: WB-106 Breadboard 2420 dots
' SW: MikroC PRO for PIC 2010 (version v4.15)
' Configuration Word
' Oscillator: INTOSC:I/O on RA.6, I/O on RA.7
' Watchdog Timer: OFF
' Power up Timer: Disabled
' Master Clear Enable: Enabled
' Browun Out Detect: Enabled
' Low Voltage Program: Disabled
' Data EE Read Protect: Disabled
' Code Protect: OFF
'*******************************************************************************
*/
void Tone1()
{
Sound_Play(5000, 1000); // Frequency = 659Hz, duration = 250ms
}
void Tone2()
{
Sound_Play(4000, 1000); // Frequency = 698Hz, duration = 250ms
}
void Tone3()
{
Sound_Play(3000, 1000); // Frequency = 784Hz, duration = 250ms
}
void Melody1() // Make funny melody 1;
{
Tone1(); Tone2(); Tone3();
Tone3(); Tone2(); Tone1();
Tone1(); Tone3(); Tone2();
Tone3(); Tone2(); Tone1(); Tone3();
Tone1(); Tone2(); Tone3();
Tone3(); Tone1(); Tone2(); Tone2(); Tone1();
}
void ToneA() // Tone A;
{
Sound_Play(1618, 50); // (frequency, duration)
}
void ToneB() // Tone B;
{
Sound_Play(1918, 50); // (frequency, duration)
}
void ToneC() // Tone C;
{
Sound_Play(2212, 50); // (frequency, duration)
}
void Melody2() // Make funny melody 2;
{
unsigned short i;
for (i = 12; i > 0; i--)
{
ToneA(); ToneB(); ToneC();
}
}
void main()
{
CMCON |=7; // Disable comparator
TRISB = 0xF0; // Pins RB7-RB4 are configured as inputs,
// RB3 is configured as an output
Sound_Init(&PORTB, 3);
Sound_Play(5000,100); // Start with this song (frequency, duration)
while (1) // infinite loop
{
if (Button(&PORTA,4,1,0)) // RB4 generates Tone1
Tone1();
if (Button(&PORTA,6,1,0)) // RB6 generates Tone2
Tone2();
if (Button(&PORTA,7,1,0)) // RA7 generates melody 2
{
Melody2();
Delay_ms(1500); // Delay 1,5s
Melody2();
Delay_ms(1500); // Delay 1,5s
Melody2();
}
}
}
