This compact sonar range finder by Maxbotix detects objects from 0 to 6.45 m (21.2 ft) with a resolution of 2.5 cm (1") for distances beyond 15 cm (6"). Unlike other sonar range finders, the LV-MaxSonar has virtually no dead zone: it can detect even small objects up to and touching the front sensor face!
 

Specifications and Features

• Small and light: 0.870" x 0.785" x 0.645" (2.2 x 2.0 x 1.6 cm), 0.15 oz (4.3 g)
• Long range detection: 0 – 6.45 m (21.2 ft)
• No dead zone (detections from 0 to 6" are output as 6")
• Resolution of 1" (2.5 cm)
• Low typical current consumption: 2 mA
• Runs on 2.5 – 5.5 V
• 42 kHz ultrasonic sensor
• 20 Hz reading rate
• Free-run or triggered operation
• Three interfaces (all are active simultaneously):
  • Serial output: asynchronous, logic-level, inverted, 9600 bps 8N1
  • Analog output: (Vcc/512) / inch (10 mV/inch when input voltage Vcc = 5 V)
  • Pulse width output: 147 μs/inch