超聲波測距模塊+AVR單片機控制程序

#include<avr/io.h>#include#includeint main(void){DDRA=0x00;PORTA=0x00;    //PA口初始化DDRD=0xff;PORTD=0xff;    //PD口初始化char j,i;int h,u,l;while(1){j=1;     //激活while(j)循環(huán)i=1;     //激活while(i)循環(huán)u=6000;     //還原檢測循環(huán)     PORTA&=(1<<0);   //PA0腳高電平_delay_us(20);   //延時20USPORTA&=~(1<<0);   //PA0腳低電平。發(fā)送20US的高電平脈沖while(j){if(PINA&(1<<1))  //判斷PA1有無返回高電平{while(i){h=0;    //初始計數(shù)變量_delay_us(10);  //延時及計數(shù)h=h+10;    //計數(shù)累加10usif(!(PINA&(1<<1))) //判斷PA1口是否跳轉(zhuǎn)到低電平{i=0;   //至while值為零j=0;   //檢測完成，跳出while(j)l=h*3;   //計算出mmif(250>=l){PORTD=0b00000001;}else if(500>=l&&l>=250){PORTD=0b00000010;}else if(750>=l&&l>=500){PORTD=0b00000100;}else if(1000>=l&&l>=750){PORTD=0b00001000;}else if(1250>=l&&l>=1000){PORTD=0b00010000;}else if(1500>=l&&l>=1250){PORTD=0b00100000;}else if(1750>=l&&l>=1500){PORTD=0b01000000;}else if(2000>=l&&l>=1750){PORTD=0b10000000;}else{PORTD=0b00000000;}_delay_ms(600);   //檢測完成，延遲顯示}}}_delay_us(10);  //當(dāng)PA1未返回高電平開始循環(huán)檢測，間隔10usu=u-1;    //循環(huán)程序固定循環(huán)U次if(u&0)    //當(dāng)循環(huán)U次后，判斷U是否為0，跳出while（j）{j=0;}}   }}