我一点思路没有 《用51单片机实现》 通俗易懂，如何解决？(语言-c语言)

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该回答引用ChatGPT

基本功能:

#include <stdio.h>
#include <stdlib.h>
#include <time.h>

#define OFF 0
#define LOW 1
#define MEDIUM 2
#define HIGH 3

int fan_speed = OFF; // 初始风速
int timer = 0; // 定时器

// 设置风速
void set_fan_speed(int speed) {
    fan_speed = speed;
    printf("当前风速：%d\n", fan_speed);
}

// 设置定时器
void set_timer(int time) {
    timer = time;
    printf("设置定时：%d\n", timer);
}

// 显示剩余定时时间
void show_remaining_time() {
    while (timer > 0) {
        printf("剩余时间：%d\n", timer);
        sleep(1);
        timer--;
    }
    fan_speed = OFF;
    printf("定时结束，当前风速：%d\n", fan_speed);
}

int main() {
    int choice;
    while (1) {
        printf("菜单：\n");
        printf("1. 设置风速（1-LOW，2-MEDIUM，3-HIGH）\n");
        printf("2. 设置定时器（以秒为单位）\n");
        printf("3. 退出\n");
        scanf("%d", &choice);
        switch (choice) {
            case 1:
                printf("请输入风速：");
                scanf("%d", &choice);
                switch (choice) {
                    case 1: set_fan_speed(LOW); break;
                    case 2: set_fan_speed(MEDIUM); break;
                    case 3: set_fan_speed(HIGH); break;
                    default: printf("无效的风速\n");
                }
                break;
            case 2:
                printf("请输入定时时间：");
                scanf("%d", &timer);
                set_timer(timer);
                show_remaining_time();
                break;
            case 3:
                return 0;
            default:
                printf("无效的选项\n");
        }
    }
    return 0;
}

PWM功能：

#include <stdio.h>

int main()
{
    int mode;

    printf("Enter mode (1-4): ");
    scanf("%d", &mode);

    switch(mode)
    {
        case 1:
            printf("PWM duty cycle: 20%%\n");
            break;
        case 2:
            printf("PWM duty cycle: 50%%\n");
            break;
        case 3:
            printf("PWM duty cycle: 80%%\n");
            break;
        case 4:
            printf("PWM duty cycle: 100%%\n");
            break;
        default:
            printf("Invalid mode\n");
            break;
    }

    return 0;
}

数码管显示功能:

#include <stdio.h>
#include <unistd.h>

int main()
{
    int mode;
    int time = 180;

    printf("Enter mode (1-4): ");
    scanf("%d", &mode);

    while (time >= 0)
    {
        printf("Mode: ");
        switch(mode)
        {
            case 1:
                printf("A\n");
                printf("PWM duty cycle: 20%%\n");
                break;
            case 2:
                printf("B\n");
                printf("PWM duty cycle: 50%%\n");
                break;
            case 3:
                printf("C\n");
                printf("PWM duty cycle: 80%%\n");
                break;
            case 4:
                printf("D\n");
                printf("PWM duty cycle: 100%%\n");
                break;
            default:
                printf("Invalid mode\n");
                break;
        }
        printf("Time remaining: %d\n", time);
        time--;
        sleep(1);
    }

    return 0;
}

LED显示部分:

#include <stdio.h>
#include <unistd.h>

int main()
{
    int interval = 800;
    int input;

    while (1)
    {
        printf("LED On\n");
        usleep(interval * 1000);
        printf("LED Off\n");
        usleep(interval * 1000);

        printf("Enter 1 to increase interval, -1 to decrease interval, 0 to exit: ");
        scanf("%d", &input);

        if (input == 1)
        {
            interval += 200;
        }
        else if (input == -1)
        {
            interval -= 200;
        }
        else if (input == 0)
        {
            break;
        }
    }

    return 0;
}

• 这有个类似的问题, 你可以参考下: https://ask.csdn.net/questions/7630678
• 你还可以看下嵌入式硬件参考手册中的 c语言-exp()

就是一个串口通信程序+一个pwm控制，练练手吧，不难的

以下答案引用自GPT-3大模型,请合理使用：
Can anyone help me clarify this please? I have no idea what it means.