51黑论坛_PID控制电压.zip_PID控制电压_gulfken_pid_pid 51_tuneuk1

#include<reg52.h> #include "ADC.h" #include "LCD1602.h" #include "PID.h" uchar str[]="Set the voltage!"; float INPUT=2.5; float out; uchar DA,AD;//AD,DA为0-255 void key_process() { uchar key; if(P3==0xff) { delay(100); key=P3; switch (key) { case 0xFE: INPUT=INPUT+1; break; case 0xFD: INPUT=INPUT-1; break; case 0xFB: INPUT=INPUT+0.1; break; case 0xF7: INPUT=INPUT-0.1; break; case 0xEF: INPUT=INPUT+0.01; break; case 0xDF: INPUT=INPUT-0.01; break; default: break; } if(INPUT>5.0) { INPUT=5.0; } else if(INPUT<0.0) { INPUT=0.0; } } } void LCD_voltage() { uint voltage; uchar i; uchar tab[5]; voltage=(uint)(INPUT*100); tab[0]=voltage/100+'0'; tab[1]='.'; tab[2]=voltage%100/10+'0'; tab[3]=voltage%10+'0'; tab[4]='V'; write_com(0xc0); for(i=0;i<5;i++) { write_data(tab[i]); } } void main() { uchar i; pid_init(); LCD_init(); write_com(0x80); for(i=0;i<16;i++) write_data(str[i]); while(1) { key_process(); LCD_voltage(); out=pid_process();//读取PID运算结果 DA=(uchar)(out*255/5);//转换成DA数据 P0=DA; //转换成对应的电压值 AD=ADC0832(0); //AD采集DA所输出的电压值 y_cur=(float)AD*5/255;//反馈给PID } }