Patent ID: 7362216

Claim:
A reversing sensor device without a control box for a vehicle, the device comprising at least one master-sensor and more than one multiple slave-sensors; wherein the master-sensor has an obstacle detection function, connects to the slave-sensors, uses a polling technique to coordinate and control the operating timing of each slave-sensor to collect a sensing result and comprises; a microprocessor for generating a square wave signal, collecting an A/D conversion result, communicating with the slave-sensors, and calculating a distance from the obstacle to the vehicle; an ultrasonic emission circuit being connected to the microprocessor to boost voltage potential of the square wave signal and then driving an ultrasonic transceiver to transmit an ultrasonic wave; a reflective wave detection circuit being connected to the ultrasonic transceiver and connected to the microprocessor, wherein when the transmitted ultrasonic wave encounters an obstacle and then is reflected to the ultrasonic transceiver, the reflective wave detection circuit detects and amplifies a reflective signal and then sends the amplified reflective signal to the microprocessor; a gate circuit connected to the microprocessor and the slave-sensors and controlled by the microprocessor to select one slave-sensor communicating with the microprocessor; an alarm circuit connected to the microprocessor and outputting a warning signal based on a control of the microprocessor in accordance with the sensing result of the master-sensor or the slave-sensors.