Sensor, safety door switch and control method thereof

The invention provides a sensor, a safety door switch and a control method of the safety door switch. The sensor is mainly composed of an antenna, a wireless receiving and transmitting chip, a reference voltage switching circuit, an LC resonance circuit electrically connected with the wireless receiving and transmitting chip, a microprocessor and the like. Wherein the microprocessor is electrically connected with the antenna, the wireless transceiver chip and the reference voltage switching circuit module. Moreover, the microprocessor is used for controlling the starting of the reference voltage switching circuit module after sensing and identifying the trigger, and adjusting the reference voltage for supplying power to the wireless transceiver chip, so as to adjust the resonant frequency of the LC resonant circuit and the carrier frequency of the antenna, thereby adaptively adjusting the distance range of data interaction with the trigger. Compared with the prior art, the sensor, the safety door switch and t