求一個純硬件呼吸燈的思路?

ID:1088099 · 發(fā)表于 2024-5-30 10:31

想做點小玩意玩玩，突然就想到了呼吸燈，又想到了能不能純硬件實現(xiàn)呼吸燈。各位大佬有沒有思路？555定時器之類的

ID:123289 · 發(fā)表于 2024-5-30 13:54

不復(fù)雜：雙穩(wěn)，周期斜坡電流，驅(qū)動LED。

ID:401564 · 發(fā)表于 2024-5-30 14:30

運放輸出三角波,后面加一個電壓跟隨器,輸出加個電阻串聯(lián)就可以了
不管是理論上還是實際上,這都是一個相對簡單的電路的,我實際上也做過這個小電路
但是,意義何在?

ID:69038 · 發(fā)表于 2024-5-30 15:10

百度一下關(guān)鍵字：“LM358呼吸燈電路”，有你想要的。

ID:961114 · 發(fā)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;                   //清中斷標(biāo)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模塊（必須先使能模塊后面的設(shè)置才有效）

P_SW2 = 0x80;
PWM0CKS = 0x00;                            // PWM0時鐘為系統(tǒng)時鐘
PWM0C = CYCLE;                            //設(shè)置PWM0周期
PWM00T1= 0x0000;
PWM00T2= 0x0001;
PWM00CR= 0x80;                            //使能PWM00輸出
P_SW2 = 0x00;

PWMCFG01 = 0x05;                         //啟動PWM0模塊并使能PWM0中斷
EA = 1;

while (1);
}

ID:996773 · 發(fā)表于 2024-5-31 14:58

樓主的想法無意義，這本來是在軟件系統(tǒng)中比較優(yōu)越的設(shè)計，例如，菜單設(shè)定欄可以用呼吸燈

效果表示當(dāng)前選定，編程時鐘調(diào)整分鐘的時候，讓分鐘字體產(chǎn)生呼吸效果，其他字體常亮。樓主

僅僅讓一盞燈實現(xiàn)硬件呼吸效果，怎么用，如何用，顯擺都沒技術(shù)含量

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