Ultrasonic ranging system for elevator

An ultrasonic ranging system for an elevator comprises a control chip and an ultrasonic sensor embedded in an elevator door, and the signal input end of the control chip is connected with the signal output end of the ultrasonic sensor and the signal output end of a debugging serial port module. The signal output end of the control chip is respectively connected with the signal input ends of the debugging serial port module and the 485 communication module; the 220V alternating current power supply is connected with the power receiving ends of the control chip, the debugging serial port moduleand the 485 communication module through the 220V-to-5V power supply module and the 5V-to-3.3 V power supply module respectively; whether there is a person in front of the elevator is calibrated through the ultrasonic sensors and the detection echoes, if there is a person, the elevator will stop at the floor, the door will be opened, if no person exists, the elevator will continue to run and willnot stop at the floor, mea