Light barrier system Joker²

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Joker² - Infrared camera trigger, light barrier system, camera trap for high speed photography

High-performance microcontroller-based light barrier system working with up to three infra-red beams, able to control up to four cameras or flashes or eight electrical devices such as drop dispensers, electromagnets, coils, etc.

Scope of delivery: the system consists of one controller, three infrared beams (light barriers) and three 80mm reflectors. All infrared beams and reflectors are provided with a ¼" tripod socket.


Information about disposal of electrical and electronic equipment

  • Features
  • Brief discription
  • Specifications
  • Easy start
  • Accessories
  • Downloads
  • Software


  • Microcontroller-based light barrier system, photoelectric camera trigger system
  • 3 reflex light barriers (light beams)
  • 4 outputs for cameras, flashes, etc.
  • each output has two power switches fully controlled by software. Hence, up to 8 different loads like cameras, flashes, electromagnetic valves can be controlled
  • Graphic display (128x64 Pixel)
  • Touch panel for data input
  • Display and key lighting
  • Works independent of the ambient light – in both darkness and glistening sunlight
  • Powered by 3 AA-cells (batteries or rechargables) within the controller or via external power supply (3.3 V - 15 V)
  • Non-volatile storage of all settings (parameters)
  • Adjustment aid for aligning the barriers: variable bar ans switchable beep for each barrier
  • Display shows which light beam is interrupted
  • Display shows which output is operating
  • Factory reset – turns all parameters to default settings
  • Supports several languages: German, English, French, Italian, Spanish, Dutch, Luxembourgian


  • 8 operating modes: simple-, cross-, direction barrier, curtain barrier with 2 light beams, cross barrier with 3 light beams, direction-sensitive cross light barrier, light curtain with 3 light beams, time release
  • each output can be manually triggered (by pressing the OK button)
  • programming of sequencies so called "steps". This is a very powerful tool for the easy programming of complex procedures
  • Automatic mirror lock up flips up the camera mirror to reduce cameras lag time
  • Camera lag time measurement
  • Subject speed measurement

The infrared camera trigger system Joker² consists of two functional units: one analogue unit, which controls the three light beams and one digital unit that operates the four outputs. Linking up of the analogue and the digital parts creates totally new possibilities for actuating cameras, flashes or other devices arise.

For example, it is fairly easy to have one output react to light beam 1 and control a camera, while another one reacts to light beam 3, for example, and releases a flash. In addition, the user can individually determine the release time delay, the lentgh of release, number of releases etc. for each output. Apart from that it is possible to define a timeframe with a start- and stop time within which (and only during this time!) the output is allowed to respond to incidents.

There is a variety of parameters which control the properties of the infreared camera trigger.

The following ssettings can be made for the analogue unit, which constitues the infrared light-beams themselves:

  • The action mode is a combination of several light beams. As soon as one action mode is considered fulfilled (e.g. light beam interrupted), an output can react and trigger a camera, for example. The infrared camera trigger system Joker² contains eight action modes:
    simple light barrier

    Simple light barrier
    As soon as the light beam is interrupted, the action mode is considered fulfilled.

    cross barrier

    Cross light barrier
    Two light beams are arranged such that their beams cross each other. If an object is located directly at the crossing point, thus both light beams interrupted, the action mode is fulfilled (logical AND-operation).

    direction barrier

    Direction-sensitive light barrier
    The action mode is fulfilled if light beam number one is interrupted first and then light beam number two afterwards.

    two beam curtain barrier

    2-beam curtain light barrier
    The action mode is filfilled as soon as at least one light beam is interrupted (logical OR-operation).

    three beam cross barrier

    3-beam cross light barrier
    This action mode is comparable to the simple cross barrier. However, this one is carried out as AND-operation with 3 light beams. The action mode is fulfilled when all three light beams are interrupted at the same time. They do not necessarily have to be placed in the same plane.

    cross direction barrier

    Cross direction-sensitive light barrier
    This is a combination of the direction-sensitive and the cross barrier. The action mode is fulfilled when an object interrupts light beam 1 first and then the cross barrier of light beams 2 and 3.

    curtain barrier

    Curtain light barrier
    The action mode is fulfilled if at least one light beam is interrupted (logical OR-operation). Using curtain IR camera triggers, it is possibe to scan whole areas, as can be necessary for bird photography. When positioning three light beams upright with an approximate distance just a little short of the bird´s wingspan, it is possible to scan an area of almost four wingspans; the height depends on the distance between IR camera trigger and reflector.

    time lapse

    Time exposure
    When entering a starting and a stopping point using the format (day of the month, hour, minute) and an interval using the format (hour, minute, second), it is possible to take pictures in fast motion. The IR camera trigger system includes a real-time clock allowing for programmed time exposure with a lead time of up to one month.

  • Sensitivity:determines the minimum size of an object that is needed to interrupt the light beam of the IR camera trigger. This makes it possible to blind out small objects in favour of larger ones.
  • Range: determines the luminosity of the transmitter diode using two positions: “sensitive“ is designed for maximum sensitivity while “distance“ is designed for maximum reach.
  • Dwell time: determines the minimum time that an object needs to interrupt the light beam for it to be detected. In this way, faster objects can be blinded out in favour of slow ones
  • Scan mode:
    • with reflector: the emitted light beam is reflected by a reflector (typical use)
    • without reflector: the emitted light beam is reflected by the object itself (no reflector needed)
    • passive: the light barrier captures thunderbolds (works without reflector)

The four outputs are controlled by the digital part of the IR camera trigger system. These react to triggers (events), which may be initiated by the analogue part, due to the fulfillment of an action mode or the interruption of a certain light beam, for example, but also by the user as a manual trigger or by the digital part itself. The performance of each output can be determined individually using the following parameters:

  • Release delay: time period between the arrival of the trigger and the beginning of the first release impulse.
  • Release duration: length/duration of a release impulse
  • Release time period: In case of multiple release - time period between the beginning of one release impulse and the beginning of the next release impulse.
  • Interval: Time period the output needs to respond between the arrival of one trigger and the next one (dead time).
  • Repetitions: determines the number of repetitions of a release impulse
  • Timeframe start: determines the start of a timeframe, throughout which the output responds to a trigger
  • Timeframe end: determines the end of a timeframe throughout which the output responds to a trigger.
  • Trigger: determines the event (trigger) to which the output is to respond.
    • Action mode: output responds to action mode that is set up in the analogue part
    • Light barrier 1: output responds to interruption of light beam 1
    • Light barrier 2: output responds to interruption of light beam 2
    • Light barrier 3: output responds to interruption of light beam 3
    • Manual: the output is triggered by the pressing the OK button
    • Single elease: the output runs the programmed sequence, consisting of release delay, release duration, time period of release and repetitions only once (manual trigger)
    • Continuous release: - the output carries out the programmed sequence, consisting of delay of release, duration of release, release time period and repetitions, continuously (manual trigger)
  • Drive mode:
    • single: the output runs the programmed sequence one time only
    • continuous:the output runs the programmed sequence continuously
      • on manual trigger: until the ESC button is pressed
      • on light barrier triggers: as long as the beam is interrupted
  • Link: two outputs can be linked by a logical OR
  • Mirror lock up: this parameter enables an automatic process. It will flip up the camera mirror, once the camera flippes it down.
  • Wake-Up: this mode keeps all the devices awake that go to the power save mode after some time.
  • Copy: using this function, the parameters of the current output can be copied to other outputs.
  • Type and design:
    • Reflex infrared camera trigger system with pulsing infrared light
    • Number of light beams: 3
    • Wavelength infrared light: 850 nm
    • Number of outputs: 4
    • Number of solid state switches: 8 (2 for each output)
  • Physical dimensions
    • Controller (length x width x height): 199 x 94/58 x 40/28 mm
    • Light Barrier (length x width x height): 64 x 36 x 35 mm
    • Cable length of light barrier : 2.95 m
  • Weight
    • Controller (without batteries): 190 g
    • Light barrier with cable: 80 g
  • Power supply:
    • 3 AA batteries (AA, LR6), all primary cells with 1,5 V, however not lithium batteries.
    • 3 rechargeable batteries, (AA, LR6), NiCd, NiMH, however no lithium rechargeable batteries.
    • DC-voltage source 3.2 - 15 V, 100 mA
  • Power consumption – using 3 light barriers
    • Operating mode "sensitive" : app. 25 mA
    • Operating mode "distance": app. 58 mA
  • Reach: distance between light barrier and 80 mm reflector:
    • Operating mode "sensitive": ca. 3 m
    • Operating mode "distance": ca. 10 m
  • Sensitivity – smallest detectable object:
    • app. 0.2 mm with a 40 mm reflector
  • Response time:
    • app. 200 µs (0.2 ms)

To get started with the photoelectric barrier set Jokie² you need a camera adapter for your camera. The cable length of our camera adaptor sets amounts from 2.5 m to 5.2 m, depending on the type of camera you have. This length is enough for insect, bird or table top photography.

In case of work with larger tele lenses, we recommend extension cords.

For fixing the Jokie² light barrier we recommend tripods or clamps with 1/4" thread, or our Strap-Flex holder as universal mounting accessory.


Extension to the Joker² system, works as sound trigger, with input for external sensors like insustrial sensors, moisture/water detection for fotographing waterwings, etc., manual trigger button
incl. VAT
packing extra


Strap-Flex - universal holder for light photographic equipment
incl. VAT
packing extra

Adapter set for flashes

Hot shoe adapter set for flashes, for connecting eltima devices to flashes or radio remote controls
incl. VAT
packing extra

DC power supply 3 - 12 V, 1000 mA

Power supply for Jokie, Jokie², Joker², or the eltima adapter for inductive loads
incl. VAT
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Drop dispenser

Drop dispenser for accurate generation of water drops for drop photography. Using the drop dispenser pillars, crests, drop collisions, multicolour drop collisions etc. can be created.
incl. VAT
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Carrier system for experimental photography

Modular, convertable and variously adjustibale carrier system for experimental photography, such as drop, splahes or falling objects, as well as for nature-, bird-, and insect photography
incl. VAT
packing extra

Adaptor for inductive loads, set

Adaptor for easy connecting coils and valves, with protection diode and manual operation button, DC-Power supply, connection cord 2.5 m
incl. VAT
packing extra

Spare light barrier for Joker²

Spare light barrier for the Joker² system
incl. VAT
packing extra

Softwareupdates for the light barrier system Joker² are for free. If you want to update your system, please send the gadget to us. We will update it immediately and send it back to you.

Version - 02.01.2012: smaller bugfixes

Nr. Change Type
1 some typos corrected bug
2 the times in the timer action mode are now correctly initialized bug
3 the outputs b, c and d will now switch when using the trigger "release once" bug
4 copy function: the selection of the source now works properly bug
5 speed measurement: the speed is now shown correctly in both units: m/s and km/h bug


Version - 11.11.2013: new functionalities especially for the experimental photography like water drops, splashes etc., extension of the functionality of the outputs, ease of handling

Handling, Display

Nr. Change Type
1 manual triggers can now be set by pressing the OK button. No more need to switch the levels up and down. feature
2 processes can now be stopped by pressing ESC feature
3 by pressing ESC one can jump from any higher level to the alignment level feature
4 if not needed, the new X-levels for experimental photography can be hidden by a system parameter feature
5 the intensity of the ambielt light for switching on the display lighting can now be set by a system parameter feature

Basic Parameters

Nr. Change Type
1 the sensibility can now be set for each of the three light barriers feature
2 the scanning mode for the barriers can now be set:
  • with reflector: same as before
  • without reflector: in thid case the object will be the "reflector"
  • passiv: the barrier reacts on fast canges of the light intensity, like a thunderbold


Nr. Change Type
1 the parameter trigger now gets a "manual" mode, "release once" and "cont release" have being removed feature
2 the parameter drive mode has being added:
  • single: the output settings are processed continuously
  • continuous: the output settings are processed once
    • on manual trigger: until the ESC-buton is pushed
    • on light barrier trigger: as long as the light barrier is interrupted
3 a "link" parameter has being added. Outputs can now be kinked by a logical OR feature
4 the succession of the parameters has being reorganized feature

Extensions for the experimental photography

The user now has full software control to all fo the 8 switches of the gadget, 2 for each of the 4 outputs. Therefote up to 8 different devices, like cameras, flashes, electromagnetic valves, etc., can be controlled.

The programming is carried out by 9 so called "steps". Each step contains a set of times and can control any of the switches. Steps can be concatenationed to sequencies. By doing this, complex scenarios can be easily programmed.

Please see teh detailed description of the new functions in our new User Manual for teh light barrier system Joker2.