Automatic door remote control The composition of the automatic door remote control system
The transmitter part is generally divided into two types, namely, remote control and transmitter module, remote control and remote control module is for the use of the way, the remote control can be used as a whole machine, the external leads have wiring pile head; Module in the circuit
When a component is used and is applied according to its pin definition, the advantage of using the remote control module is that it can be seamlessly connected to the application circuit, with a small size, low price, and the user must really understand the circuit principle. With the remote control to the convenience.
Receiving part is generally divided into two types, namely, superheterodyne and super-regenerative receiver, super regenerative demodulation circuit, also known as super-regenerative detection circuit, it is actually working in the intermittent oscillation state of the regenerative detection circuit. Superheterodyne demodulation circuit and superheterodyne radio the same, it is set up a local oscillation circuit to generate oscillation signal, and received the carrier frequency signal mixing, the IF (usually 465kHz) signal, the intermediate frequency amplification and Detect, demodulate the data signal. Since the carrier frequency is fixed, the circuit is simpler than the radio. Superheterodyne receiver is stable, high sensitivity, anti-interference ability is relatively good; super-regenerative receiver small size, cheap.
Commonly used automatic door remote control system is generally divided into two parts.
