ULN2003是高耐压、大电流达林顿阵列，由7个硅NPN达林顿管组成。ULN2003灌电流可达500mA，并且能够在关态时承受50v的电压，输出还可以在高负载电流并行运行。本例使用ULN2003驱动步进电机，在运行过程中，按下K1将使步进电机正转3圈,按下K2时反转3圈,在转动过程中按下K3时可使步进电机停止转动。
Proteus仿真截图：
Atmel Studio6.2 编译通过截图：
程序清单：
- /*
- * GccApplication36.c
- *
- * Created: 2014-12-18 20:42:55
- * Author: Administrator
- */
- #define F_CPU 4000000UL
- #include <avr/io.h>
- #include <util/delay.h>
- #include <stdint.h>
- //正转序列 A->AB->B->BC->C->CD->D->DA
- const uint8_t FFW[] = {0x01,0x03,0x02,0x06,0x04,0x0c,0x08,0x09};
- //反转序列 A->AD->D->CD->C->BC->B->AB
- const uint8_t REV[] = {0x01,0x09,0x08,0x0c,0x04,0x06,0x02,0x03};
- #define K1_DOWN() ((PIND & _BV(PD0))== 0x00)
- #define K2_DOWN() ((PIND & _BV(PD1))== 0x00)
- #define KX_DOWN() (PIND != 0xFF)
- void STEP_MOTOR_RUN(uint8_t Direction,uint8_t n)
- {
- uint8_t i,j;
- for(i=0;i<n;i++)
- {
- for(j=0;j<8;j++)
- {
- if(KX_DOWN())return;
- if(Direction == 0)
- PORTB = FFW[j];
- else
- PORTB = REV[j];
- _delay_ms(200);
- }
- }
- PORTB = 0x01;
-
- }
- int main(void)
- {
- uint8_t r=3;
- DDRB = 0xFF;PORTB = FFW[0];
- DDRC = 0xFF;PORTC=0xFF;
- DDRD = 0x00;PORTD = 0xFF;
-
- while(1)
- {
- //TODO:: Please write your application code
- if(K1_DOWN())
- {
- while(K1_DOWN());
- PORTC = 0xFE;
- STEP_MOTOR_RUN(0,r);
- }
- if(K2_DOWN())
- {
- while(K2_DOWN());
- PORTC = 0xFD;
- STEP_MOTOR_RUN(1,r);
- }
- PORTC = 0xFB;
- }
- }
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