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Advance-645 v2.0 $49.33US
2 - 6 : $46.86US ( save 5% )
7 - 19 : $44.39US ( save 10% )
20 + : $39.46US ( save 20% )
excl. sales tax

Create awareness of your surroundings. Ultrasonically senses distances of objects from 0.152 to 6.45 m (0.500 to 21.2 ft.), depending on object size and acoustic reflectivity. Detects people up to approximately 1 m (3 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, TapMatOn or TapStripOn sensors on the floor or stairs 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 2.0 (June 2021)
Sensing parameter distance, proximity
Sensing method ultrasonic (42 KHz) MB1040 sensor
Active volume between a 36 to 50 ° cone, at most 1 m (3 ft) wide, and a 0.6 m (2 ft) wide cylinder (see application notes below)
Range 0.152 to 6.45 m (0.500 to 21.2 ft.), dependent on object size and acoustic reflectivity
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
Dimensions 20 x 22 x 16.4 mm (0.79 x 0.87 x 0.65 inch)
Mounting two 3.15 mm (0.124 inch) mounting holes diagonally spaced apart 21.5 mm (0.85 inch)
Cable 1.0 m (3 ft), shielded, red wire = power, black wire = ground, white wire = sensor output, extendable at least 100 m (328 ft) with ExtendCableD-10
Connector male 1x4 plug with a row of 3 pins spaced 2.54 mm (0.100 inch)
Weight 4.4 g (0.16 oz), incl. cable
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. The active volume in which small or non-reflective (such as people) objects are detected is a cone that is at most approximately 1 m (3 ft) wide. For an object at least 11 inch wide and flat, facing parallel to the sensor, the active volume is mostly a cylinder with a 0.6 m (2 ft) diameter.
  3. The maximum distance at which objects can be detected is dependent on the object's dimensions. Small or non-reflective (such as people) are detected at up to approximately 1 m (3 ft). To detect an object at the maximum distance of 6.45 m (21.2 ft) the object should be at least 11 inch wide and flat, facing parallel to the sensor.
  4. Multiple 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. Note that these emission cones are larger than the active volume cones.
  5. 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 Wednesday 06 July 2022.
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