Sniper simulator based on a laser pointer. Scheme, description

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ENCYCLOPEDIA OF RADIO ELECTRONICS AND ELECTRICAL ENGINEERING
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Sniper simulator based on a laser pointer. Encyclopedia of radio electronics and electrical engineering

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Encyclopedia of radio electronics and electrical engineering / Beginner radio amateur

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This toy is called a sniper simulator because it allows you to train the shooter's hand. The laser pointer is built into the layout of the pistol (or other small arms) so that when the trigger is pressed, it shines constantly. When the laser beam hits the photosensitive target, the countdown of the time interval will begin, during which the beam will not leave the target. Once this happens, the countdown will stop. When the beam hits the target again, the readings will be reset and the count will start again. When holding competitions with such a device, the winner will be the one who keeps the beam on the target the longest.

The simulator (see figure) contains a photosensitive sensor on the VT1 phototransistor, a voltage comparator on the DD1.1 element, a counting pulse generator on the DD1.3 element, a reset pulse shaper on the DD1.2, DD1.4 elements, binary-decimal counters on the DD2 microcircuits , DD3, decoders DD4, DD5 and sign-synthesizing indicators HG1, HG2.

Sniper simulator based on laser pointer

While the laser beam from the pointer does not hit the phototransistor, the output of the DD1.1 element is a low logic level, the generator and the shaper do not work. If you direct the laser beam at the phototransistor, a high logic level will appear at the output of the DD1.1 element, and they will come into action. A high-level pulse from the output of the shaper will go to the inputs R of the microcircuits DD2, DD3, the counters will be reset. At the end of the reset pulse, they will respond to counter pulses by counting their number. The count will continue as long as the laser beam illuminates the phototransistor. As soon as the lighting stops, the generator will turn off, the indicators will record the number of pulses received by the counter. In this device, it cannot be more than 99.

Thus, the longer the phototransistor was illuminated, the greater the number the indicator will indicate. By changing the frequency of the counting pulses with a variable resistor R5, you can change the maximum possible time interval controlled by the device.

In addition to those indicated in the diagram, in place of DD2, DD3, you can use similar microcircuits of the K555, KR1533 series, and in place of HG1, HG2 - indicators ALC324A, ALC338A, KIPTs01 with indices A, B, D. Trimmer resistor R1 - SPZ-19a, variable R5 - SPO, SP4-1, permanent - MLT, S2-33. Oxide capacitor - K50-6, K50-35 or similar.

The phototransistor must be placed in the target, the design of which is described in the above article, and its dimensions must be chosen depending on the specific conditions. Place the target preferably in a place protected from direct sunlight and other light sources. With a close location of the board and the phototransistor (several tens of centimeters), they can be connected with ordinary wires. For longer distances, shielded wire should be used.

You need to power the device from a stabilized unit with an output current of at least 200 mA.

Setting up the simulator comes down to setting the sensitivity of the photo-target with the tuning resistor R1. If necessary, the duration of the reset pulse can be changed by selecting elements C2 and R4.

Author: I. Nechaev, Kursk

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