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PGA460-Q1: 0cm - 10cm Ultrasonic Proximity Sensor / Switch

Part Number: PGA460-Q1

Hello

I am working on a robotic application where I am planning on using ultrasonic sensors for floor edge detection (eg: stairs). My sensing distance will be less than 10cms. Can the PGA460-Q1 (or any other TI product) be used for such short range detection?  I do not need a accurate distance read out. Just the presence or absence of the floor below the robot edge. The ultrasonic transducers will be mounted facing down to sense the floor. 

I hope I've made the requirement clear.