Description: /* details of the program:
* use AT89S51 microcontroller to produce "di, di,..." The alarm sound is output from P3.2 port, generating frequency of 1KHz.
* 1KHZ square wave outputs 0.2 seconds from P3.2, followed by 0.2 seconds from P3.2 output level signal, so that it can be circulated to form the alarm sound we need.
*
* programming methods
* (1. In life we often go to all kinds of alarm sounds, such as "di, di,..." It's the usual kind of voice call,
* but for the sound of the alarm, for 0.2 seconds, then for 0.2 seconds, the cycle goes on, assuming that the frequency of the beep is 1KHz,
* because of the above signal, we divide the above signal into two parts, one of which is 1KHZ square wave,
* take up to 0.2 seconds; The other part is the level, which also takes 0.2 seconds. Therefore, we use the timing/counter T0 of the SCM to be the timing.
* can be timed for 0.2 seconds; At the same time, it is also needed to generate 1KHZ square wave with single chip microcomputer, and 1KHZ square wave signal period is 1ms,
* the high level takes up 0.5ms and the low level occupies 0.5 ms, so the timer T0 is also used to complete the time of 0.5 ms.
* finally, the timing time of the time/counter T0 can be selected as 0.5 ms, while the timing 0.2 seconds is 400 times as much as 0.5 ms.
* this means that a time of 0.2 seconds will be reached 400 times per half ms time.
* /
To Search:
- [fbjsq] - square counter-prepared C said : Countin
- [HJYJXZ.c] - Using c language realize the Runge-Kutta
- [door_ring] - /* Procedure detailed functional Introdu
- [migong] - Their own language with a C written by M
- [clock] - 51 single-chip microcomputer with intern
- [cd1] - 51 Singlechip routines, including the se
- [KeyboardAndClockCode] - With 8-bit digital tube display circuit
- [89S51-911] - Used to achieve single-chip buzzer 911 s
File list (Check if you may need any files):
Download