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[導(dǎo)讀]一、概述火災(zāi)自動(dòng)報(bào)警系統(tǒng)(Fire Alarm System,簡(jiǎn)稱FAS系統(tǒng))是人們?yōu)榱嗽缙诎l(fā)現(xiàn)通報(bào)火災(zāi),并及時(shí)采取有效措施,控制和撲滅火災(zāi),而設(shè)置在建筑物中或其它場(chǎng)所的一種自動(dòng)消防設(shè)施,是人們同火災(zāi)作斗爭(zhēng)的有力工具。【

一、概述

火災(zāi)自動(dòng)報(bào)警系統(tǒng)(Fire Alarm System,簡(jiǎn)稱FAS系統(tǒng))是人們?yōu)榱嗽缙诎l(fā)現(xiàn)通報(bào)火災(zāi),并及時(shí)采取有效措施,控制和撲滅火災(zāi),而設(shè)置在建筑物中或其它場(chǎng)所的一種自動(dòng)消防設(shè)施,是人們同火災(zāi)作斗爭(zhēng)的有力工具?!?】

本設(shè)計(jì)中以溫度探頭和煙霧傳感器作為火災(zāi)報(bào)警器的傳感裝置,并以LED和蜂鳴器作為示警裝置。

二、功能

●高溫檢測(cè)。傳感器選用DS18B20,當(dāng)環(huán)境溫度大于40℃,高溫報(bào)警指示燈亮,LCD1602第一行顯示溫度。

●環(huán)境煙霧濃度檢測(cè)。傳感器選用MQ2煙霧傳感器,AD0809作模數(shù)轉(zhuǎn)換傳煙霧濃度數(shù)據(jù)給單片機(jī)。當(dāng)環(huán)境煙霧濃度大于50時(shí),煙霧濃度指示燈亮,LCD1602第二行顯示煙霧濃度。

當(dāng)溫度和煙霧濃度同時(shí)過(guò)高時(shí),蜂鳴器發(fā)出報(bào)警聲音。

三、硬件設(shè)計(jì)

溫度傳感器:DS18B20

煙霧傳感器:MQ2。MQ2輸出的模擬電壓信號(hào),使用ADC0809作模數(shù)轉(zhuǎn)換后輸入單片機(jī)。


四、程序設(shè)計(jì)


部分程序段:

○LCD1602顯示部分程序

#define LCD_DATA P0 //lcd1602的引腳

sbit LCD_RS = P2^0;

sbit LCD_RW = P2^1;

sbit LCD_EN = P2^2;

void LCD_Init(void)

{

Delay20ms();

LCD_WriteCmd(0x38); //8位機(jī)接口、雙行顯示、5×7字符點(diǎn)陣;

LCD_WriteCmd(0x0c); //顯示開啟、光標(biāo)不顯示也不閃爍;

LCD_WriteCmd(0x01); //清屏;

LCD_WriteCmd(0x06); //光標(biāo)右移一位、整屏不移動(dòng);

LCD_Goto(0,0);

}

void LCD_WriteDat(unsigned char lcd_dat)

{

unsigned char tmp;

tmp = LCD_ReadStatus(); //讀狀態(tài);

while((tmp & 0x80)) //是否忙 ?

{

tmp = LCD_ReadStatus();

}

LCD_RS = 1;

LCD_RW = 0;

LCD_DATA = lcd_dat;

_nop_();

LCD_EN = 0;

_nop_();

_nop_();

LCD_EN = 1;

}

void LCD_WriteCmd(unsigned char lcd_cmd)

{

unsigned char tmp;

tmp = LCD_ReadStatus();

while((tmp & 0x80))

{

tmp = LCD_ReadStatus();

}

LCD_RS = 0;

LCD_RW = 0;

LCD_DATA = lcd_cmd;

_nop_();

LCD_EN = 0;

_nop_();

_nop_();

LCD_EN = 1;

}

unsigned char LCD_ReadStatus(void)

{

unsigned char tmp;

#if 0

LCD_RS = 0;

LCD_RW = 1;

LCD_EN = 1;

tmp = LCD_DATA;

LCD_EN = 0;

#endif

LCD_DATA = 0xff;

LCD_RS = 0;

LCD_RW = 1;

LCD_EN = 0;

_nop_();

_nop_();

LCD_EN = 1;

tmp = LCD_DATA;

return tmp;

}

void LCD_Goto(unsigned char x,unsigned char y)

{

unsigned char tmp;

if(y) //若是第二行;

{

tmp = 0xc0 + x;

LCD_WriteCmd(tmp);

}

else

{

tmp = 0x80 + x;

LCD_WriteCmd(tmp);

}

}

void LCD_Display(unsigned char row,unsigned char *str)

{

if(row)

{

LCD_Goto(0,1);

}

else

{

LCD_Goto(0,0);

}

while(*str != '