用51单片机实现电梯控制系统代码

以下是一个简单的电梯控制系统的代码，使用了51单片机和按键矩阵：

#include <reg52.h>

// 定义按键矩阵的行列数和对应端口
#define ROWS 4
#define COLS 4
sbit ROW1 = P1^0;
sbit ROW2 = P1^1;
sbit ROW3 = P1^2;
sbit ROW4 = P1^3;
sbit COL1 = P1^4;
sbit COL2 = P1^5;
sbit COL3 = P1^6;
sbit COL4 = P1^7;

// 定义电梯当前状态，初始为停止状态
#define STOP 0
#define UP 1
#define DOWN 2
int state = STOP;

// 定义电梯当前所在楼层，初始为1层
int current_floor = 1;

// 定义电梯目标楼层
int target_floor = 1;

// 定义电梯上下行标志
int direction = 0;

// 定义延时函数
void Delay(unsigned int i)
{
    unsigned char j,k;
    for(j=0;j<i;j++)
        for(k=0;k<125;k++);
}

// 读取按键矩阵
unsigned char ReadKey()
{
    unsigned char key = 0;
    ROW1 = 0; ROW2 = 1; ROW3 = 1; ROW4 = 1;
    if(!COL1) {Delay(5); if(!COL1) key = '1';}
    if(!COL2) {Delay(5); if(!COL2) key = '2';}
    if(!COL3) {Delay(5); if(!COL3) key = '3';}
    if(!COL4) {Delay(5); if(!COL4) key = 'A';}
    ROW1 = 1; ROW2 = 0; ROW3 = 1; ROW4 = 1;
    if(!COL1) {Delay(5); if(!COL1) key = '4';}
    if(!COL2) {Delay(5); if(!COL2) key = '5';}
    if(!COL3) {Delay(5); if(!COL3) key = '6';}
    if(!COL4) {Delay(5); if(!COL4) key = 'B';}
    ROW1 = 1; ROW2 = 1; ROW3 = 0; ROW4 = 1;
    if(!COL1) {Delay(5); if(!COL1) key = '7';}
    if(!COL2) {Delay(5); if(!COL2) key = '8';}
    if(!COL3) {Delay(5); if(!COL3) key = '9';}
    if(!COL4) {Delay(5); if(!COL4) key = 'C';}
    ROW1 = 1; ROW2 = 1; ROW3 = 1; ROW4 = 0;
    if(!COL1) {Delay(5); if(!COL1) key = '*';}
    if(!COL2) {Delay(5); if(!COL2) key = '0';}
    if(!COL3) {Delay(5); if(!COL3) key = '#';}
    if(!COL4) {Delay(5); if(!COL4) key = 'D';}
    return key;
}

// 更新电梯状态
void UpdateState()
{
    if(state == UP) {
        if(current_floor < target_floor) {
            current_floor++;
            direction = UP;
        } else {
            state = STOP;
            direction = 0;
        }
    } else if(state == DOWN) {
        if(current_floor > target_floor) {
            current_floor--;
            direction = DOWN;
        } else {
            state = STOP;
            direction = 0;
        }
    }
}

// 主函数
void main()
{
    while(1) {
        unsigned char key = ReadKey();
        switch(key) {
            case '1': target_floor = 1; break;
            case '2': target_floor = 2; break;
            case '3': target_floor = 3; break;
            case '4': target_floor = 4; break;
            case '5': target_floor = 5; break;
            case '6': target_floor = 6; break;
            case '7': target_floor = 7; break;
            case '8': target_floor = 8; break;
            case '9': target_floor = 9; break;
            case '*': target_floor = 10; break;
            case '0': target_floor = 1; break;
            case '#': target_floor = 11; break;
            case 'A': if(state == STOP) {state = UP; direction = UP;} break;
            case 'B': if(state == STOP) {state = DOWN; direction = DOWN;} break;
            default: break;
        }
        UpdateState();
        // TODO: 控制电梯的上下行和开关门等操作
    }
}

这个代码中，我们使用了一个按键矩阵来读取用户输入的目标楼层，然后根据目标楼层和当前楼层的关系来更新电梯的状态。在主函数中，我们可以根据电梯的状态来控制它的上下行和开关门等操作。需要注意的是，这个代码只是一个简单的示例，实际的电梯控制系统需要考虑更多的因素，比如电梯的负载、电梯门的安全等。