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许多电视、音频和录象设备需要用于音量、音调、颜色、平衡控制的模拟信号。下面介绍一个以单片机,红外线发射器和数模转换器构成的遥控系统(见图)。该遥控系统利用一个MC14497红外线发射芯片,它基本上是一组互相连接的记数器。记数器时钟来自一个陶瓷调谐振荡器。当发射器探测到控制键电路的开关闭合时,就把开关状态转换成一组数据,该组数据调制与红外线
Many television, audio and video equipment require analog signals for volume, tone, color, balance control. Here is a remote control system with a microcontroller, infrared transmitter and digital to analog converter (see photo). The remote control system uses an MC14497 infrared transmitter chip, which is basically a set of interconnected registers. The counter clock comes from a ceramic tuned oscillator. When the transmitter detects that the switch of the control key circuit is closed, the switch state is converted into a set of data that is modulated with infrared