51单片机控制舵机转动（不用按键）自动转动
整个程序不就是改变相应的timer1的值控制转动特定角度么，为什么无论我改变什么数，都旋转90度啊，而且有正90有负90，timer1=10的时候还会从-90到-27.6来回转是怎么回事，角度的正和负是怎么控制的[*]// _nop_()延时一个机器周期
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#include <reg52.h>
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#include <intrins.h>
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sbit PWM = P3^0;//设定PWM输出的I/O端口
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unsigned char count = 0;
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unsigned char timer1 ;
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/*
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对于180°舵机
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t = 0.5ms——————-舵机会转动 0 °
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t = 1.0ms——————-舵机会转动 45°
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t = 1.5ms——————-舵机会转动 90°
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t = 2.0ms——————-舵机会转动 135°
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t = 2.5ms——————-舵机会转动180
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*/
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/*延时程序*/
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void delay1s(void) //误差 0us
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{
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unsigned char a,b,c;
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for(c=167;c>0;c--)
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for(b=171;b>0;b--)
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for(a=16;a>0;a--);
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_nop_();//if Keil,require use intrins.h
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}
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/*定时器T0初始化*/
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void Timer0_Init()
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{
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TMOD &= 0x00;
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TMOD |= 0x01; //定时器T0设置成方式1
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TH0 = 0xff; //定时常数 0.1ms 晶振为11.0592MHz
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TL0 = 0xa4;
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ET0 = 1;
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TR0 = 1;
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EA=1;
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}
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/*T0中断初始化*/
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void Time0_Init() interrupt 1
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{
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TR0 = 0;
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TH0 = 0xff; // 0.1ms
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TL0 = 0xa4;
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if(count <= timer1) //5==0° 15==90°
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{
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PWM = 1;
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}
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else
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{
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PWM = 0;
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}
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count++;
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if (count >= 200) //T = 20ms清零
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{
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count = 0;
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}
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TR0 = 1; //开启T0
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}
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void main()
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{
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Timer0_Init();
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while(1)
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{
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timer1 =5;//舵机恢复到0°的位置
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count=0;//让定时器重新计数
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delay1s();
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timer1 =10;
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count=0;
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delay1s();
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}
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}
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[*]收起
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