Pololu Sharp GP2Y0D810Z0F Distance Sensor - 2cm to 10cm

Note that these sensors will only tell you if there is an object within the detection range along their lines of sight; they will not tell you how far away the object is. Distance sensing range: 2cm to 10cm ; Sampling rate: 390 Hz ; Quick response time, small size, and low current draw; Easy to integrate into your project; Note that these sensors will only tell you if there is an object within the detection range along their lines of sight; they will not tell you how far away the object is.