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Advance-645 v1.2 $53.91US
2 - 6 : $51.21US ( save 5% )
7 - 19 : $48.52US ( save 10% )
20 + : $43.13US ( save 20% )
excl. sales tax

Create awareness of your surroundings. Ultrasonically senses distances of objects, persons, walls from 0.152 to 6.45 m (0.500 to 21.2 ft.). Is invisible to the audience. Completely silent to the human ear, hence it is suitable for sound installations.

Application examples

  • Use for distance measurement relative to a wall or presence detection of objects and people (it cannot detect the number of people present).

Other human, animal and object sensors

We offer a number of sensors to detect motion and/or presence and/or proximity of humans, animals and objects in a space:

  • For a motion sensor with variety of sensitivity and output configuration options, view the MoveOn v1.8.
  • If you need a motion sensor of which the output changes each time any motion is detected so that it can be smoothed to give a signal that roughly represents the amount of activity, checkout the MoveOn v1.4.
  • A smaller version which output stays high while motion is detected and during a fixed length of time afterwards, try the MoveMiniOn.
  • Want to detect motion through walls ? See the MoveThruOn.
  • Need to detect presence as well as body temperature ? Try the HotSpot2D.
  • The Advance-645 detects the distance of a person in a 50° cone.
  • Need pin-point distance detection ? The ReachFar and its digital, laser-accurate cousin ReachFarD detect distance up to 4 m within a cone of a few degrees. The ReachClose and its digital, laser-accurate cousin ReachCloseD do the same but up to 2 m.
  • Setup perimeters with break-beams made from a SeeLaser-Red or the invisible SeeLaser-IR (or any of our SeeLaser products) and a Flash.
  • Place TapTile sensors on the floor to detect a person stepping or standing on it, and even get a measure of the exerted force.
  • To know exactly who is present, use the ReachID and let each visitor be detected through their RFID tag.

Technical specifications

Product Advance-645 sensor
Version 1.1 (May 2009)
Sensing parameter distance, proximity
Sensing method ultrasonic (42 KHz)
Active volume 36 to 50 ° cone (dependent on distance)
Range 0.152 to 6.45 m (0.500 to 21.2 ft.)
Resolution 2.5 cm (1.0 inch)
Update rate 20 Hz
m ft Voltage (use 5 V power supply) 7-bit MIDI value (use 'no processing' editor preset)
0 to 0.152 0 to 0.500 0.59 1
6.45 21.2 2.49 63
Operating temperature -40 to 85 °C (-40 to 185 °F)
Power supply 4.75 to 5.25 V DC, 2 mA
Sensor dimensions 20 x 22 x 16.4 mm (0.79 x 0.87 x 0.65 inch)
Weight 4.4 g (0.16 oz), incl. cable
Cable 1.0 m (3 ft), shielded, red wire = power, black wire = ground, white wire = sensor output, maximum extension ? m (? ft)
Connector male plug with a row of 3 pins spaced 2.54 mm (0.100 inch)
Software support

  1. Our SensePlay software is a very easy way to quickly map sensor data to (sequences of) sounds, images and videos using a drag & drop user interface.
  2. Our EditorX software allows you to configure the digitizer to process and map the sensor data of multiple sensors simultaneously.
  3. Our Link software allows you to receive the sensor data from the digitizer and use your computer to view, calibrate, record, process and map the sensor data of multiple sensors simultaneously.
  4. Our SensorX software allows you to receive the sensor data from the digitizer and use your computer to view, calibrate, record, process and map the data of a single sensor.

Application notes
  1. upon power-up, the sensor performs a distance calibration, so if anything is closer than 35 cm (14 inch) it can cause close objects to be ignored
  2. multiple Advance-645 sensors can be placed adjacently where the spacing is determined by the maximum distance to be measured at which distance the ultrasound emission cones should not overlap
  3. any indirect echoes of the ultrasonic pulse (eg. from the sidewalls in a narrow corridor) may generate incorrect sensor output values

This page was updated on Friday 05 February 2021.
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