ABBDSTD110A【图片仅供参考,实际产品电话或***咨询】[诚信经营][质量可靠][进口原装][拆包防伪][大量库存][当天付款][顺风速运][欢迎***]公司主营AB、本特利、黑马、施耐德、GE、ABB【DSQC系列】ICS英维思西门子yokogawa横河霍尼韦尔福克斯波Rosemount（罗斯蒙特）德国EPRO（飞利浦）ENTEK（恩泰克）VIBRO-METER（韦伯）Yaskawa（安川）Motorola（摩托罗拉）BoschRexroth（博世力士乐）Woodward（伍德沃德）等品牌DSTD110ADSTD110ADSTD110A在很多单片机应用系统中，常常利用非电信号（如光信号、超声波信号等）传送控制信息和数据信息，以实现遥控或遥测的功能。例如在单相电度表抄表系统中，就是使用手持抄表器通过遥控的方式，来完成电度表用电量的抄录、设置表底数、电度表校时等工作。红外通信具有控制简单、实施方便、传输可靠性高的特点，是一种较为常用的通信方式。实现单片机系统红外通信的关键在于红外接口电路的设计以及接口驱动程序的设计。1红外通信的基本原理红外通信是利用950nm近红外波段的红外线作为传递信息的媒体，即通信信道。发送端采用脉时调制（PPM）方式，将二进制数字信号调制成某一频率的脉冲序列，并驱动红外发射管以光脉冲的形式发送出去；接收端将接收到的光脉转换成电信号，再经过放大、滤波等处理后送给解调电路进行解调，还原为二进制数字信号后输出。简而言之，红外通信的实质就是对二进制数字信号进行调制与解调，以便利用红外信道进行传输；红外通信接口就是针对红外信道的调制解调器。2红外通信接口的硬件电路设计单片机本身并不具备红外通信接口，但可以利用单片机的串行接口与片外的红外发射和接收电路，组成一个应用于单片机系统的红外串行通信接口，如图1所示。2.1红外发送器红外发送器电路包括脉冲振荡器、驱动管T1和T2、红外发射管D1和D2等部分。其中脉冲振荡器由NE555定时器、电阻（R1、R2）和电容（C1、C2）组成，用以产生38kHz的脉冲序列作为载波信号；红外发射管D1和D2选用Vishay公司生产的TSAL6238，用来向外发射950nm的红外光束。红外发送器的工作原理为：串行数据由单片机的串行输出端TXD送出并驱动T1管，数位“0”使T1管导通，通过T2管调制成38kHz的载波信号，并利用两个红外发射管D1和D2以光脉冲的形式向外发送。数位“1”使T1管截止，红外发射管D1和D2不发射红外光。若传送的波特率设为1200bps，则每个数位“0”对应32个载波脉冲调制信号的时序，如图2所示。3HAC14000-33HAC14000-43HAC14000-53HAC14000-63HAC14001-13HAC14002-13HAC14003-13HAC14004-13HAC14024-13HAC14046-13HAC14047-13HAC14048-13HAC14049-13HAC14050-13HAC14051-13HAC14053-13HAC14054-13HAC14058-13HAC14064-13HAC14067-13HAC14069-13HAC14070-13HAC14081-13HAC14085-13HAC14087-13HAC14088-13HAC14090-13HAC14094-13HAC14096-13HAC14097-13HAC14117-13HAC14125-13HAC14131-13HAC14137-13HAC14137-23HAC14139-13HAC14140-13HAC14146-13HAC14147-13HAC14171-13HAC14171-23HAC14178-13HAC14185-13HAC14185-23HAC14200-13HAC1420-13HAC14207-23HAC14208-13HAC14209-33HAC14210-23HAC14211-23HAC14214-13HAC14219-13HAC14221-13HAC14222-13HAC14226-13HAC14230-13HAC14230-183HAC14230-193HAC14230-23HAC14230-33HAC14231-43HAC14257-13HAC14263-13HAC14265-13HAC14279-13HAC14280-13HAC14290-13HAC14300-13HAC14310-73HAC14310-83HAC14310-93HAC1432-13HAC14363-13HAC14369-13HAC14406-13HAC1441-13HAC14426-13HAC14427-13HAC14428-13HAC1443-13HAC14434-13HAC14445-13HAC14446-13HAC14453-13HAC14453-23HAC14457-33HAC14457-43HAC14459-13HAC14463-13HAC14463-23HAC14463-33HAC14463-43HAC14474-13HAC14475-13HAC14485-13HAC14485-23HAC14485-33HAC14488-13HAC14488-23HAC14488-33HAC14488-43HAC14491-13HAC14493-13HAC14493-23HAC14494-13HAC14494-23HAC14494-33HAC14494-43HAC14503-13HAC14506-13HAC14507-13HAC14509-13HAC14512-13HAC14524-13HAC14525-13HAC14526-13HAC14529-13HAC14529-23HAC14529-33HAC14529-43HAC14532-13HAC14533-13HAC14534-13HAC14535-13HAC14536-13HAC14536-43HAC14539-13HAC14540-13HAC14541-13HAC14542-13HAC14543-13HAC14544-13HAC14545-13HAC14546-13HAC14546-33HAC14546-43HAC14547-13HAC14549-13HAC14549-23HAC14549-33HAC14550-13HAC14550-23HAC14550-33HAC14550-43HAC14551-13HAC14551-23HAC14551-33HAC14576-13HAC14590-13HAC14611-13HAC14615-13HAC14617-13HAC1462-13HAC14624-13HAC14625-13HAC14627-2)