The picture above is the small speaker in the test board (due to the light problem, the label on the speaker is a little reflective)
LOOP: SETB P3.7
LCALL DELAY
CLR P3.7
LCALL DELAY
AJMP LOOP
DELAY: MOV R7,#250
D1: MOV R6,#250
D2: DJNZ R6,D2
DJNZ R7,D1
RET
END
Then you can hear the sound of the small speaker.
But some friends will ask, there are so many kinds of sounds, what should we do? It's very simple, we change its delay time, and the sound will change.
LOOP: SETB P3.7
LCALL DELAY
CLR P3.7
LCALL DELAY
AJMP LOOP
DELAY: MOV R7,#25
D1: MOV R6,#25
D2: DJNZ R6,D2
DJNZ R7,D1
RET
END
At this time, you can hear the small speaker making a "beep" sound. By adjusting its delay time appropriately, we can make it make the sounds of DO, RUI, MI, FA SO, LA , XI, DO . This is the basic principle of making the microcontroller make sounds.
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Professor at Beihang University, dedicated to promoting microcontrollers and embedded systems for over 20 years.
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