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ReachCloseD v1.0 $35.87US
2 - 6 : $34.08US ( save 5% )
7 - 19 : $32.29US ( save 10% )
20 + : $28.70US ( save 20% )
excl. sales tax

A sensor for waving at your gear. Leave your fans in awe of your magic majestic gestures. Reaches up to 200 cm (79 inch) distance. Has linear behaviour, resulting in a smooth output that corresponds proportionally with your movement. A digital I2C sensor, that outputs cailbrated, high resolution, low-noise signals. For a version with 4 m range, see the ReachFarD. To have a range up to 5.5 meter use the ReachFar.

Requires a WiDig, or USB-microDig running firmware v7.5 or higher.

Application examples

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 ReachCloseD sensor
Version 1.0 (September 2017)
Sensing parameter distance, proximity
Sensing method modulated infra-red (940 nm) laser light reflectance sensor
Field of view 25 ° cone
Range 0 to 200 cm (79 inch) with indoor white (88% reflectance) target, 80 cm (31 inch) with outdoor grey (88% reflectance) target, 80 cm (31 inch) with indoor grey (17% reflectance) target, 50 cm (20 inch) with outdoor grey (17% reflectance) target. Target must cover full field of view.
Range accuracy (method 0, 2, 4, 6) 4% with indoor white (88% reflectance) target at 120 cm, 7% with outdoor grey (88% reflectance) target at 60 cm, 7% with indoor grey (17% reflectance) target at 70 cm, 12% with outdoor grey (17% reflectance) target at 40 cm. Target must cover full field of view.
Range accuracy (method 1, 3, 5, 7) 3% with indoor white (88% reflectance) target at 120 cm, 6% with outdoor grey (88% reflectance) target at 60 cm, 6% with indoor grey (17% reflectance) target at 70 cm, 9% with outdoor grey (17% reflectance) target at 40 cm. Target must cover full field of view.
Response time 20 ms (method 0, 2, 4, 6), 200 ms (method 1, 3, 5, 7)
Range, Latency, Accuracy and Method
100 cm20 (ms)lowerObject2
100 cm20 (ms)lowerAlways6
100 cm200 (ms)higherObject3
100 cm200 (ms)higherAlways7
200 cm20 (ms)lowerObject0 (default)
200 cm20 (ms)lowerAlways4
200 cm200 (ms)higherObject1
200 cm200 (ms)higherAlways5
Power supply 4.75 to 5.25 V DC, 19 mA at 5 V
Operating temperature -20 to 70 °C (-4 to 158 °F)
Dimensions 25 x 12 x 5 mm (1.0 x 0.47 x 0.2 inch)
Mounting two 2.8 mm (0.11 inch) mounting holes spaced apart 20 mm (0.79 inch)
Cable 1.0 m (39 inch), shielded, red wire = power, black wire = ground, white wire = sensor output, extendable at least 20 m (66 ft) with ExtendCableD-10
Connector male 1x4 plug with a row of 3 pins in a row spaced 2.54 mm (0.100 inch)
Weight 12 g (0.42 oz), incl. cable
Software support
  • Our EditorX software allows you to configure the digitizer to process and map the sensor data of multiple sensors simultaneously.

  • 17 Jul 2019: ReachCloseD v1.10 for MacOS and Windows from source code in Max. For multiple sensors or sensor outputs, run multiple instances of the application, each started in its own folder. Requires a digitizer with firmware v7.5 or higher. Use together with Connect (MacOS / Windows).
Application notes
  1. Make sure the sensor is plugged into the digitizer with the red wire connected to power. Reversing the plug may cause damage to the sensor.
  2. Requires a WiDig or USB-microDig running firmware v7.5 or higher.
  3. The default I2C address is 41 (0x29). Both I2C lines have 10 kOhm pull-up resistors.
  4. Our software enables you to use most features of this sensor. In EditorX, use the method parameter to set the sensor to output distance with low accuracy 2 m range (method 0 or 4), high accuracy 2 m range (method 1 or 5), low accuracy 1 m range (method 2 or 6) or high accuracy 1 m range (method 3 or 7).
  5. Methods 1, 3, 5 and 7 measure with higher accuracy than methods 0, 2, 4 and 6. To achieve this the measurement takes about 200 ms whereas the lower accuracy methods 0, 2, 4 and 6 take about 20 ms. Accuracy also depends on ambient light as well as target size and reflectance.
  6. In standalone mode, methods 0..3 don't output a value if there is no object in the beam, ie. if the detected distance is the maximum range. Methods 4..7 always output a value.
  7. See also the ReachCloseD function description in the firmware documentation for more details about the various methods available in host and standalone mode.
  8. For more technical specs, and to find out how to access the sensor data in detail, please consult this datasheet.
  9. For best results when using a high accuracy range method, operate under low ambient light level conditions.
  10. The sensor will not measure the distance of objects placed behind glass (or other transparent surfaces) but the distance to the glass instead.
  11. To extend the cable, use ExtendCableD-01 and/or ExtendCableD-10.

This page was updated on Monday 05 September 2022.
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