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FlashDark v2.0 $20.09US
2 - 6 : $19.08US ( save 5% )
7 - 19 : $18.08US ( save 10% )
20 + : $16.07US ( save 20% )
excl. sales tax

Measures rapid light changes or light flashes. Like the Flash sensor it measures the illuminance level in a similar field of view. In addition to the Flash sensor it can output on/off signals triggered by an illuminance level that can be set by the user. Outputs a lower value as the illuminance level increases, ie. outputs the maximum value when it's dark. Check the Light sensor for a wider field of view and larger illuminance detection range. See this videoclip for a demo of the Flash v1 applied together with the SeeLaser-Red !

Application examples

  • Use with SeeLaser-Red (red beam), SeeLaser-IR (invisible beam) or SeeIR (invisible beam, but for a distance less than 1 m) to create a break-beam that triggers when you cross it. Laserharp anyone ? Create a virtual cage for dancers. Or detect intruder, visitor, dog, cat, mouse .... movements.

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, FlashOn or FlashDark.
  • 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 FlashDark sensor
Version 2.0 (August 2021)
Sensing parameter visible brightness, illuminance
Sensing method phototransistor
Active volume ? ° cone
Spectral response range 400 to 1100 nm (900 nm peak), ie. ultra-violet to infra-red
Illuminance range ? Lux (? mW/cm2)
Response time ? ms
Power supply 3.3 to 5 V DC, ? µA at 5 V
Dimensions 42 x 16 x 10 mm (1.6 x 0.63 x 0.40 inch)
Mounting one 3 mm (0.12 inch) mounting hole
Cable 1.0 m (39 inch), shielded, red wire = power, black wire = ground, white wire = analog sensor output, grey wire = on/off sensor output, extendable at least 100 m (328 ft) with ExtendCableD-10
Connector male 1x4 plug with a row of 4 pins spaced 2.54 mm (0.100 inch)
Weight 11 g (0.39 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
  • To use the on/off output that can be set using the potentiometer on the sensor, the pin connected to the grey wire has to be moved to the slot where the white wire is. Lift the plastic lever in the housing to allow the pin to be pushed out and insert the other pin instead.
  • Use the invert processing method in EditorX to output a higher value when the illuminance level increases.
  • When using the sensor for detection of point light sources and proximity detection, remember that ambient light needs to be regulated so as not to interfere with the desired operation.

This page was updated on Saturday 05 February 2022.
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