引用第2楼yanli12321于2013-07-13 13:04发表的  :
小扬声器无爱.........用蜂鸣器多好
叉童鞋的焊工实在不敢恭维.........这恐怕无法承受住火箭的加速度吧

刚才试着摔了几次，正常工作。我的焊工被吐槽不是第一天了，淡定。蜂鸣器找不到，应该是没有，只好用这个。

NE555的话，我改一次时间设置，就要改一次电阻阻值，改完还要掐秒表测试。而且，怎么指示工作状态呢？

用STM8单片机来做，用户只要按按钮就可以设置时间了，岂不快哉。
STM8很便宜的，1.7元一片，最贵的都是人工费用。

测试中出现了洞洞板焊盘脱落的情况，充分地验证了“花钱少，麻烦多”这一伟大理论。马上找了非常高级的洞洞板，重新焊了一个 ，刷上程序，万事大吉。

//timerchute.c

#include <stmduino.h>
uint time=0;
uint delaytimer=0;
#define buttondelay 200
#define minimumtime 1000
#define beep pwmout(t2c1,62)
#define nobeep pwmout(t2c1,0)
uint binterval=3000/8;
uint bcounter=2800/8;
uchar beepstate=0xff;

uint setting=0;
uchar state=0;
/*
states
0 wait
1 setting

3 starting
4 triggered(wire broken, wait for certain time.
5 chute(noreturn unless button.
*/

void tick()
{
  bcounter++;
  bcounter%=binterval;
  if(bcounter==0||(bcounter==2980/8&&state==0)){
    if(beepstate){
      //beep;
      timer2(COUNT);
    }else{
      //nobeep;
      timer2(STOP);
    }
    if(bcounter==2980/8&&state==0)
    {
      beepstate=0x0;
    }
    else
    {
      beepstate=!beepstate;
    }
  }
  
  if(delaytimer!=0){
    delaytimer--;
  }
  else
  {
    
    switch(state)
    {
    case 0:
      binterval=3000/8;
      if(pinread(A2))
      {
        //if high: button not pusht
        if(pinread(A3)){
          //if a3 is high:not connected
        }
        else
        {
          //if a3 is conn to gnd:start waiting for line break
          state=3;
          delaytimer=buttondelay*5/8;
        }
      }
      else
      {
        //if low: button pusht,enter setting mode
        state=1;
        time=0;
        delaytimer=500/8;
        binterval=50/8;
      }
      break;
    case 1:
      binterval=500/8;
      time++;
      if(pinread(A2)){
        //button is not pushed
      }
      else
      {
        //button is pusht
        setting=time;
        eeuint(600)=setting;
        time=0;
        state=0;
        binterval=50/8;
        delaytimer=1000/8;
      }
      break;
    case 3:
      binterval=200/8;
      if(pinread(A3)){
        //if a3 is not connected
        state=4;//enter timing mode
        time=0;
      }
      else
      {//dont do anyting.
      }
      break;
    case 4://wire broken. timing...
      binterval=50/8;
      time++;
      if(time>setting)
      {
        //triggered, please chute!
        state=5;
        delaytimer=100/8;
      }
      else
      {
        
      }
      break;
    case 5://execute chute operation
      beepstate=0xff;
      
      pinhigh(A1);
      time--;
      if(time==0){
        state=0;
        delaytimer=500/8;
        pinlow(A1);
        binterval=50/8;
      }
      
      break;
    }
  }
  
}

void main()
{
  clock(2M);
  cpudivider(2);
  
  
  timer4clock(64,249);//8ms interrput
  
  pinMode(A3,INPUT);
  //a3 is wire,shall connected to gnd
  
  pinMode(A2,INPUT);
  //a2 is button,connected to gnd
  
  pinMode(A1,OUTPUT);
  //a1 is chute ctrl
  
  timer2clock(2,124);
  unlock();
  CLK_PeripheralClockConfig(CLK_PERIPHERAL_I2C,DISABLE);
  CLK_PeripheralClockConfig(CLK_PERIPHERAL_TIMER1,DISABLE);
  CLK_PeripheralClockConfig(CLK_PERIPHERAL_SPI,DISABLE);
  pwmset(t2c1);
  pwmout(t2c1,62);
  pinlow(A1);
  
  //load settings
  if(eeuint(600)<minimumtime){
    setting=minimumtime;
  }
  else
  {
    setting=eeuint(600);
  }
  
  job mstick=employ(tick);
  linkjob (timer4tick,mstick);
  
  interrupts();
  while(1){sleep();}
}