The whole set of equipment that completes the remote control task is called the remote control system. The remote control system can transmit discrete control information (such as switch on and off), and can also transmit continuous control information (such as controlling the size of the engine throttle).
The radio remote control system is a technology that uses radio signals to control various institutions in the distance. After these signals are received by the remote receiving equipment, they can instruct or drive other corresponding machines to complete various operations, such as closing the circuit, moving the handle, and starting the motor, and then these machines perform the required operations. Therefore, each control signal is different from each other in frequency and duration, and it is extremely widely used for controlling ships, aircraft, missiles and other sea and air objects.
The radio remote control system includes two parts: transmitting (remote control) and receiving (switch). The transmitter encodes the control electrical signal, then modulates, converts it into a wireless signal and sends it out; receiving principle: receive the radio wave signal carrying information, and then amplify it , decoding, to obtain the original control electrical signal, and then amplify the electrical signal to drive the relevant electrical components.
The commonly used remote control switch remote control system is generally divided into two parts: transmitting and receiving.
The transmitting part is generally divided into two types, that is, the remote control and the transmitting module. The remote control and the remote control module are for the use method. The remote control can be used independently as a whole machine, and the external lead wire has a wiring pile; and the remote control The module is used as a component in the circuit, and it is applied according to its pin definition. The advantage of using the remote control module is that it can be seamlessly connected with the application circuit, small in size, low in price, and fully utilized, but the user must really understand the circuit. Principle, otherwise it is convenient to use the remote control. As a type of remote control that complements the infrared remote control, it has been widely used in the remote control of garage doors, electric doors, barrier gates, anti-theft alarms, industrial control and wireless smart home.
The receiving part is generally divided into two types, namely superheterodyne and superregenerative receiving methods. The superregenerative demodulation circuit is also called a superregenerative detection circuit, which is actually a regenerative detection circuit working in an intermittent oscillation state. The superheterodyne demodulation circuit is the same as the superheterodyne radio. It is to set up a local oscillator circuit to generate an oscillating signal. After mixing with the received carrier frequency signal, an intermediate frequency (generally 465kHz) signal is obtained, which is amplified by the intermediate frequency and Detect and demodulate the data signal. Since the carrier frequency is fixed, its circuit is simpler than that of a radio. The super-heterodyne receiver is stable, has high sensitivity, and has relatively good anti-interference ability; the super-regenerative receiver is small in size and cheap.
The commonly used carrier frequency (Carrier frequency) is 315mHz or 433mHz.
This is the application video of the wireless remote switch：
https://youtu.be/tY_BHYlEBhE
https://youtu.be/bPr08T3Nqxs