What is sound? Friends who have been to junior high school know that sound is produced by vibration. A certain frequency of vibration produces a certain frequency of sound. In our Yitian version development kit and XP development kit, the experimental version of the P3.3 port (pin 13) is connected to a small speaker. If we send a high level and a low level to it, it will make a ticking sound. We just need to change P1.0 of the flashing light tube test above to P3.3.
Reference address：[Experimental Collection] Understanding Sound
The picture above is the small speaker of our Yitian version development kit
LOOP: SETB P3.3
LCALL DELAY
CLR P3.3
LCALL DELAY
AJMP LOOP
DELAY: MOV R7,#250
D1:MOV R6,#250
D2:DJNZ R6,D2
DJNZ R7,D1
RET
END
At this time we can hear the sound of the small speaker.
But some friends may ask, what should we do with so many kinds of sounds? It's very simple, we change its delay time, and the sound will change.
LOOP: SETB P3.3
LCALL DELAY
CLR P3.3
LCALL DELAY
AJMP LOOP
DELAY: MOV R7,#25
D1:MOV R6,#25
D2:DJNZ R6,D2
DJNZ R7,D1
RET
END
At this time, we can hear the small speaker making a "beep" scream. By properly adjusting its delay time, we can make it make sounds like DO, RUI, MI, FA SO, LA, XI, DO. This is the basic principle of making sounds with the microcontroller.
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