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红外线遥控是目前使用最广泛的一种通信和遥控手段。工业设备中,在高压、辐射、有毒气体、粉尘等环境下,采用红外线遥控不仅完全可靠而且能有效地隔离电气干扰。1.红外遥控系统通用红外遥控系统由发射和接收两大部分组成,使用编/解码专用集成电路芯片来进行控制操作。发射部分包括键盘矩阵、编码调制、LED红外发射器;接收部分包括光、电转换放大器、解调、解码部分电路。2.遥控发射器及其编码下面以日本NEC的uPD6121G组成发射电路为例说明编码原理。当发射器按键按下后,有遥控码发出,所按
Infrared remote control is currently the most widely used means of communication and remote control. Industrial equipment, in the high pressure, radiation, toxic gases, dust and other environments, the use of infrared remote control is not only completely reliable and can effectively isolate electrical interference. 1. Infrared remote control system Universal infrared remote control system consists of two major components of the launch and reception, the use of coding / decoding ASIC chip for control operations. Launch part includes the keyboard matrix, encoding and modulation, LED infrared transmitter; receiving part includes light, electric conversion amplifier, demodulation, decoding part of the circuit. 2. Remote transmitter and its code below the Japanese NEC’s uPD6121G launch circuit as an example to illustrate the coding principle. When the transmitter button is pressed, a remote control code is issued, press