单片机项目15-ULN2003驱动器.docxVIP

单片机学习项目项目15-ULN2003驱动器一：电路仿真采用半步激磁方式对两相步进电机控制，需要利用单片机的4个I/O口进行控制。图5-5-6为ULN2003驱动2相步进电机电路，驱动端口占用了单片机的P2.0、2.1、2.2、2.3。二：程序清单#includereg51.h#define ucharunsigned char#define uintunsigned intuchar codeFFW[8]={0x01,0x03,0x02,0x06,0x04,0x0c,0x08,0x09}; //逆时针转动数组uchar codeREV[8]={0xf9,0xf8,0xfc,0xf4,0xf6,0xf2,0xf3,0xf1};//顺时针转动数组ucharkey1_down,key2_down,key3_down,key1_flag,key2_flag,key3_flag;//变量定义sbit key1 = P1^4;//按键定义sbit key2 = P1^5;sbit key3 = P1^6;/*延迟函数*/void delay(uint x){?while（x--）}/*按键程序*/void key_scan(void){?if(key1 == 0)?{?delay();?if(key1 == 0)key1_down = 1;?}?if(key1_down == 1 key1 == 1)//按键按下抬起有效?{?key1_down = 0;key1_flag = 1;?key2_flag = 0;?key3_flag = 0;??}?if(key2 == 0)?{?delay();?if(key2 == 0)key2_down = 1;?}?if(key2_down == 1 key2 == 1)?{?key2_down = 0;key2_flag = 1;key1_flag = 0;??key3_flag = 0;?}?if(key3 == 0)?{?delay();?if(key3 == 0)key3_down = 1;?}?if(key3_down == 1 key3 == 1)?{?key3_down = 0;key3_flag = 1;key1_flag = 0;?key2_flag = 0;?}}/****************转动延迟函数**********/void delayB(uint t){?uchar k;?while(t--)?for(k=0;k125; k++);}/************************电机正转****************************/void motor_ffw(){?uchari;?for (i=0; i8; i++)???????//一个周期转30度?{?P2= FFW[i];??????????//取数据?delayB(100);??????????//调节转速?}?}/************************电机反转****************************/void motor_rev(){?uchari;?for (i=0; i8; i++)?????//一个周期转30度?{?P2= REV[i];??????????//取数据?delayB(100);????????????//调节转速?}}/************************主程序****************************/void main(void){?while(1)?{??key_scan();?if(key1_flag ==1)motor_ffw();???????//电机正转?if(key2_flag ==1)motor_rev();????????????????//电机反转?if(key3_flag == 1) P2 = 0x0f;???????????????????????????//电机停止?}}与ULN2003类似的器件还有ULN2803芯片，在使用中与ULN2003电路特性一致，但ULN2803为8位驱动。单片机系统所使用外部器件种类很多，在单片机项目设计或产品开发过程中，只有熟练地掌握这些器件的特性，才能设计出简单高效的硬件系统。?