基于51单片机的模拟风扇系统（原理图+仿真+源程序+PCB）.zip

#include <reg52.h> #define uint unsigned int #define uchar unsigned char #define GPIO_KEY P2 uchar code LED_code[] = {0xC0, 0xF9, 0xA4, 0xB0, 0x99, 0x92, 0x82, 0xF8, 0x80, 0x90, 0x88, 0x83, 0xC6, 0xA1, 0x86, 0x8E, 0xBF}; uchar dis[4] = {1, 0, 0, 0}; int retime, down; uchar flag; uchar pwm; uchar time; //延时函数 void delay(uint k) { uint m, n; for (m = 0; m < k; m++) for (n = 0; n < 120; n++); } //数码管显示 void display(uchar num[]) { uchar i, j; j = 0x01; for (i = 0; i < 4; ++i) { P2 &= 0xf0; P2 |= j; P0 = LED_code[num[i]]; delay(1); j <<= 1; } } //循环时间更新 void update_dis(int retime) { dis[1] = retime / 100; dis[2] = (retime / 10) % 10; dis[3] = retime % 10; } void change_direction(uchar direction) { if (direction) { P2 &= ~0x10; // P24 P2 |= 0x20; // P25 } else { P2 &= ~0x20; P2 |= 0x10; } } //监听按键 uchar key_scan() { static uchar key_up = 1; static target_key; uchar i, j; j = 0x80; P3 = 0xff; for (i = 0; i < 5; i++) { if (((P3 & j) == 0) && key_up) { delay(5); key_up = 0; target_key = j; if ((P3 & j) == 0) { if (j == 0x08) dis[0] = 1; if (j == 0x10) dis[0] = 2; if (j == 0x20) dis[0] = 3; if (j == 0x40) { retime += 120; if (retime == 720 || retime > 720) retime = 0; update_dis(retime); } if (j == 0x80) { if (TR1 == 1) TR1 = 0; else TR1 = 1; } } } else if ((P3 & target_key) != 0) key_up = 1; j = j >> 1; } return 0; } void tim0() interrupt 1 { TR0 = 0; TH0 = (65536-1000)/256; TL0 = (65536-1000)%256; TR0 = 1; pwm += 1; if (pwm >= 100) pwm = 0; down += 1; if (down == 1000) { if (retime > 0) { retime -= 1; update_dis(retime); } down = 0; } if (dis[0] == 1) { if (pwm < 25) { P2 &= ~0x40; } else { P2 |= 0x40; } } if (dis[0] == 2) { if (pwm < 16) { P2 &= ~0x40; } else { P2 |= 0x40; } } if (dis[0] == 3) { if (pwm < 75) { P2 &= ~0x40; } else { P2 |= 0x40; } } } void tim1() interrupt 3 { TR1 = 0; TH1 = (65536-1000)/256; TL1 = (65536-1000)%256; TR1 = 1; time += 1; if (time == 30) { flag = !flag; time = 0; } } void int0() interrupt 2 { P2 |= 0xf0; } void init() { TMOD = 0x11; TH0 = (65536-1000)/256; TL0 = (65536-1000)%256; EA = 1; ET0 = 1; TR0 = 1; ET1 = 1; EX0 = 0; IT0 = 1; } int main() { retime = 0; flag = 0; init(); while (1) { display(dis); key_scan(); change_direction(flag); } }