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| Experiment 3. Sound Generated |
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| The Experiment 3 we will Generated sound (one frequency) by use PIC16F628 . first of all see Timing Diagram as figure 3.1 for to understand |
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Figure 3.1 Timing Diagram for Sound Generated |
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| Assemble circuit as figure 3.2 and load Programming to PIC16F628 |
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Figure 3.2 schematic for Experiment 3 Sound Generated |
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| Assemble circuit as figure 3.2 and load Program to PIC16F628 . RA4 Connect with PIEZO , The Frequency can be calculate by formula as below |
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f = 1/ T |
| 1/(768 uSec + 768 uSec) = 651 Hz |
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| Source Code For Experiment 3 |
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| list p= 16 f 628 |
; list directive to define processor |
| #include <p 16 f 628. inc> |
; processor specific variable definitions |
| __CONFIG _CP_OFF & _WDT_OFF & _BODEN_ON & _PWRTE_ON & _XT_OSC & _MCLRE_ON & _LVP_OFF |
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org |
0 x 000 |
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clrf |
PORTA |
; Initial PORTA |
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; output data latches |
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movlw |
0 x 07 |
; Turn Comparator off and |
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movwf |
CMCON |
; Enable pins for I/O |
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bsf |
STATUS,RP 0 |
; Select Bank 1 |
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movlw |
b' 11101111 ' |
; RA 4 = Output |
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movwf |
PORTA |
; Other = Input |
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bcf |
STATUS,RP 0 |
; Return to Bank 0 |
| Loop1 |
bsf |
PORTA, 4 |
; High RA 4 768 usec |
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call |
Delay |
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bcf |
PORTA, 4 |
; Low RA 4 768 usec |
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call |
Delay |
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goto |
Loop1 |
; Frequency = 1/(768 usec + 768 usec) |
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; = 651 Hz |
| Delay |
clrf |
0 x 20 |
; Delay 768 usec |
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decfsz |
0 x 20 ,f |
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goto |
$-1 |
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return |
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END |
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From The Source Code we can be explain by flowchart as figure 3.3 |
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Figure 3.3 Flowchart of Experiment 3 |
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Name List |
Quantity |
MPLAB |
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PIC16F628 |
1 |
4 MHz Crystal |
1 |
Push Button Switch 1 PC |
1 |
33 pF Capacitors |
2 |
4.7K Resistors |
1 |
1K Resistors |
1 |
PIEZO |
1 |
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| Resources ,Tools & Related |
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