三、51单片机开关控制马达/电机/小风扇

• 51单片机

使用51单片机 + ULN2003 芯片，实现效果：按住按钮1秒打开/关闭电机，10 秒后关闭电机

代码：

#include "reg52.h"

typedef unsigned int u16; // 对系统默认数据类型进行重定义
typedef unsigned char u8;

// 0~9数字
unsigned char numbers[] = {0x3F, 0x06, 0x5B, 0x4F, 0x66, 0x6D, 0x7D, 0x07, 0x7F, 0x6F};
sbit LSA                = P2 ^ 2;
sbit LSB                = P2 ^ 3;
sbit LSC                = P2 ^ 4;

sbit DC_P0 = P1 ^ 0;// 电机控制口，ULN2003芯片接入的是 0 脚
sbit KEY1  = P3 ^ 1; // 按钮 1

void delay_10us(u16 ten_us)
{
    ten_us = ten_us * 110;
    while (ten_us--)
        ;
}

void wz(u8 i) // 此显示位有8位
{
    switch (i) // 位选
    {
        case 0:
            LSC = 1;
            LSB = 1;
            LSA = 1;
            break;
        case 1:
            LSC = 1;
            LSB = 1;
            LSA = 0;
            break;
        case 2:
            LSC = 1;
            LSB = 0;
            LSA = 1;
            break;
        case 3:
            LSC = 1;
            LSB = 0;
            LSA = 0;
            break;
        case 4:
            LSC = 0;
            LSB = 1;
            LSA = 1;
            break;
        case 5:
            LSC = 0;
            LSB = 1;
            LSA = 0;
            break;
        case 6:
            LSC = 0;
            LSB = 0;
            LSA = 1;
            break;
        case 7:
            LSC = 0;
            LSB = 0;
            LSA = 0;
            break;
    }
}

void LED_draw(unsigned char position, number) // 每一帧进行绘制
{
    wz(position);         // LED的位置
    P0 = numbers[number]; // 显示数字 段选
    delay_10us(10);
    P0 = 0x00; // 消音
}

/**
 * 按住按钮1秒打开/关闭电机
 * 10 秒后关闭电机 
**/
void main()
{
    u8 time = 0, currentNumber = 0, key_flag = 0;
    DC_P0 = 0; // init 关闭电机

    while (1) {
        if (currentNumber < 10) {
            LED_draw(0, currentNumber % 10); // 个位
            delay_10us(10);// 延迟补位
        } else {
            LED_draw(0, currentNumber / 10); // 十位
            LED_draw(1, currentNumber % 10); // 个位
        }

        time++;
        if (time == 50) { // 用于控制间隔
            time = 0;
            if (currentNumber != 0)
                currentNumber--;
            else {
                DC_P0 = 0; // 关闭
            }

            if (key_flag == 1 && KEY1 == 0) {// 按钮还在按下状态时，执行打开/关闭逻辑
                key_flag = 0;
                if (DC_P0 == 0) {
                    DC_P0         = 1; // 打开
                    currentNumber = 10;
                } else {
                    DC_P0         = 0; // 关闭
                    currentNumber = 0;
                }
            }
        }
        if (KEY1 == 0)// 按下按钮 1
            key_flag = 1;
    }
}

效果