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IC解密白小姐四肖必选一肖 > 案例展示分类 > AT89C2051解密单片机程序在多路舵机控制电路的应用案例
AT89C2051解密单片机程序在多路舵机控制电路的应用案例
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ZHUANYEXINPIANJIEMIGONGSI

时间 : 2019-07-29 18:09 浏览量 : 57

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AT89C2051JIEMIDANPIANJICHENGXUZAIDUOLUDUOJIKONGZHIDIANLUDEYINGYONGANLI

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DIANYUANXIANHEDIXIANYONGYUTIGONGDUOJINEIBUDEZHILIUDIANJIHEKONGZHIXIANLUSUOXUDENENGYUAN.DIANYATONGCHANGJIEYU4~6V,YIBANQU5V。ZHUYI,JIDUOJIGONGDIANDIANYUANYINGNENGTIGONGZUGOUDEGONGLV。KONGZHIXIANDESHURUSHIYIGEKUANDUKEDIAODEZHOUQIXINGFANGBOMAICHONGXINHAO,FANGBOMAICHONGXINHAODEZHOUQIWEI20 ms(JIPINLVWEI50 Hz)。DANGFANGBODEMAICHONGKUANDUGAIBIANSHI,DUOJIZHUANZHOUDEJIAODUFASHENGGAIBIAN,JIAODUBIANHUAYUMAICHONGKUANDUDEBIANHUACHENGZHENGBI。

舵机控制器硬件电路设计

从上述舵机转角的控制方法可看出,舵机的控制信号实质是一个可嗣宽度的方波信号(PWM)。该方波信号可由FPGA、模拟电路或单片机来产生。采用FPGA成本较高,用模拟电路来实现则电路较复杂,不适合作多路输出。一般采用单片机作舵机的控制器。目前采用单片机做舵机控制器的方案比较多,可以利用单片机的定时器中断实现PWM。该方案将20ms的周期信号分为两次定时中断来完成:一次定时实现高电平定时Th;一次定时实现低电平定时T1。Th、T1的时间值随脉冲宽度的变换而变化,但,Th+T1=20ms。该方法的优点是,PWM信号完全由单片机内部定时器的中断来实现,不需要添加外围硬件。缺点是一个周期中的PWM信号要分两次中断来完成,两次中断的定时值计算较麻烦;为了满足20ms的周期,单片机晶振的频率要降低;不能实现多路输出。也可以采用单片机+8253计数器的实现方案。该方案由单片机产生计数脉冲(或外部电路产生计数脉冲)提供给8253进行计数,由单片机给出8253的计数比较值来改变输出脉宽。该方案的优点是可以实现多路输出,软件设计较简单;缺点是要添加l片8253计数器,增加了硬件成本。本文在综合上述两个单片机舵机控制方案基础上,提出了一个新的单片机设计方案,如图4所示。

 

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