求一个纯硬件呼吸灯的思路?

ID:1088099 · 发表于 2024-5-30 10:31

想做点小玩意玩玩，突然就想到了呼吸灯，又想到了能不能纯硬件实现呼吸灯。各位大佬有没有思路？555定时器之类的

ID:123289 · 发表于 2024-5-30 13:54

不复杂：双稳，周期斜坡电流，驱动LED。

ID:401564 · 发表于 2024-5-30 14:30

运放输出三角波,后面加一个电压跟随器,输出加个电阻串联就可以了
不管是理论上还是实际上,这都是一个相对简单的电路的,我实际上也做过这个小电路
但是,意义何在?

ID:69038 · 发表于 2024-5-30 15:10

百度一下关键字：“LM358呼吸灯电路”，有你想要的。

ID:961114 · 发表于 2024-5-30 16:23

#include "reg51.h"
#include "intrins.h"

#define CYCLE    0x1000

sfr    P_SW2 = 0xba;

sfr    PWMSET    = 0xF1;
sfr    PWMCFG01 = 0xF6;
sfr    PWMCFG23 = 0xF7;
sfr    PWMCFG45 = 0xFE;

#define PWM0C    (*(unsigned int  volatile xdata *)0xFF00)
#define PWM0CH    (*(unsigned char volatile xdata *)0xFF00)
#define PWM0CL    (*(unsigned char volatile xdata *)0xFF01)
#define PWM0CKS    (*(unsigned char volatile xdata *)0xFF02)
#define PWM0TADC (*(unsigned int  volatile xdata *)0xFF03)
#define PWM0TADCH (*(unsigned char volatile xdata *)0xFF03)
#define PWM0TADCL (*(unsigned char volatile xdata *)0xFF04)
#define PWM0IF    (*(unsigned char volatile xdata *)0xFF05)
#define PWM0FDCR (*(unsigned char volatile xdata *)0xFF06)
#define PWM00T1    (*(unsigned int  volatile xdata *)0xFF10)
#define PWM00T1H (*(unsigned char volatile xdata *)0xFF10)
#define PWM00T1L (*(unsigned char volatile xdata *)0xFF11)
#define PWM00T2H (*(unsigned char volatile xdata *)0xFF12)
#define PWM00T2    (*(unsigned int  volatile xdata *)0xFF12)
#define PWM00T2L (*(unsigned char volatile xdata *)0xFF13)
#define PWM00CR    (*(unsigned char volatile xdata *)0xFF14)
#define PWM00HLD (*(unsigned char volatile xdata *)0xFF15)

sfr    P0M1 = 0x93;
sfr    P0M0 = 0x94;
sfr    P1M1 = 0x91;
sfr    P1M0 = 0x92;
sfr    P2M1 = 0x95;
sfr    P2M0 = 0x96;
sfr    P3M1 = 0xb1;
sfr    P3M0 = 0xb2;
sfr    P4M1 = 0xb3;
sfr    P4M0 = 0xb4;
sfr    P5M1 = 0xc9;
sfr    P5M0 = 0xca;

void PWM0_Isr() interrupt 22
{
static bit dir = 1;
static int val = 0;

if (PWMCFG01 & 0x08)
{
      PWMCFG01 &= ~0x08;                   //清中断标志
      if (dir)
      {
         val++;
         if (val >= CYCLE) dir = 0;
      }
      else
      {
         val--;
         if (val <= 1) dir = 1;
      }
      _push_(P_SW2);
      P_SW2 |= 0x80;
      PWM00T2 = val;
      _pop_(P_SW2);
}
}

void main()
{
P0M0 = 0x00;
P0M1 = 0x00;
P1M0 = 0x00;
P1M1 = 0x00;
P2M0 = 0x00;
P2M1 = 0x00;
P3M0 = 0x00;
P3M1 = 0x00;
P4M0 = 0x00;
P4M1 = 0x00;
P5M0 = 0x00;
P5M1 = 0x00;

PWMSET = 0x01;                            //使能PWM0模块（必须先使能模块后面的设置才有效）

P_SW2 = 0x80;
PWM0CKS = 0x00;                            // PWM0时钟为系统时钟
PWM0C = CYCLE;                            //设置PWM0周期
PWM00T1= 0x0000;
PWM00T2= 0x0001;
PWM00CR= 0x80;                            //使能PWM00输出
P_SW2 = 0x00;

PWMCFG01 = 0x05;                         //启动PWM0模块并使能PWM0中断
EA = 1;

while (1);
}

ID:996773 · 发表于 2024-5-31 14:58

楼主的想法无意义，这本来是在软件系统中比较优越的设计，例如，菜单设定栏可以用呼吸灯

效果表示当前选定，编程时钟调整分钟的时候，让分钟字体产生呼吸效果，其他字体常亮。楼主

仅仅让一盏灯实现硬件呼吸效果，怎么用，如何用，显摆都没技术含量

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