Motion sensors (DD) on the basis of Fresnel lenses and pyroelectric detectors you can use it not only for its intended purpose - to turn the light on or in as part of the security alarm system installed in the room. Cars - here is perhaps the most promising area of application ideas for portable motion sensors. With the constant growth in the number of vehicles owned by population, the proposal to actively use DD can be interesting . And here's why...
There are cases when the dog or cat is used in parked car as shelter (from rain, other animals, people). In cities it is often happens in Parking lots. When the driver started the engine and abruptly moved, not always accepted, especially not perfectly healthy, have time to react and pop out from under the car. In the villages it happens more often.
In my experience breeding rabbits outside the cells (with their free walking around home - about this can be found in the literature) the proposed system warning saved the life of more than one animal. In the summer, when the machine parked at my country house, the ubiquitous rabbits (and they breed in exponentially) climb under the car overnight, and even do shallow burrows under the wheels. A motion sensor mounted under the bumper or on the bumper time you will be informed by a sound signal the driver that he is "responsibility" appeared "heat" or animate object. Infrared DD will react to any moving factor with "thermal" background.
Using DD will exclude undesirable consequences for the driver of the car and intentionally created a situation that was popular a few years ago when undersized people (from criminal motives) climbed back under the car (under heavy is even better) and, after the machine is started, simulated accident with causing lung injury, requiring the driver material compensation.
So how to install DD on the car?
Fig. 1. Connection diagram of the motion sensor DD-010 to electrical circuits car
Motion sensor DD-010 unassembled removed with the Executive Board device and further connected siren (sound power 100 dB) type КРS-4510
Fig. 2. Schematic diagram of the adapter 12 - 24V (click to enlarge)
Typically, the electronic sensor is powered permanent voltage 11 - 14 V, as evidenced located in a single housing with DD transformerless power supply with ballast capacitors at the input. To adapt domestic DD for the car, you need to check points printed circuit boards (MV-013-1 or similar) with the notation "+" (black conductor, going to the Board pyroelectric detector) and "-" (white) to apply power with automotive batteries in accordance with the polarity.
The reference point marked on this Board with the letter "K" (from her yellow wire goes to the Board pyroelectric detector) is of particular importance. When the sensor is triggered at point "K" is present, the voltage (12 V); it is managing Executive for electromagnetic relays YJR-ЗFF-S-N. Control the voltage is transmitted from the key transistor with pyroelectric Board the detector included in the mode of the current amplifier. This key transistor can to drive the load with a current up to 100 mA, it is important to know what to include additional relay where it is not provided - in motion sensors for household alarm. The contacts of the relay, in turn, designed to manage the load on the network 220 (current up to 10 A).
The printed circuit Board (MV-013-1) with a transformerless power supply, Executive relay and regulator 78L05 sensor DD-010 thus need a little to finalize.
1. Carefully cut off (with a scalpel or other suitable object) conductive the tracks on the PCB, leading from the elements transformerless source power (from the 78L05 regulator) to control contacts "+" and "-". To this points to solder the conductors of the power from the battery (through the switch of any model).
2. To the normally open contacts of the relay to solder the conductors, included in an electric circuit from the battery to the sound emitter built in generator KPI-4332 or similar (see connection diagram in Fig. 1).
After the described simple improvements DD mounted on the rear bumper of the car and pay the active surface (Fresnel lens) in the direction of the most likely the appearance of a living object. With the appearance in the area of response of the sensor (3 m) storage of heat (human or animal) a sensor is tripped, the contacts Executive relay short circuit power of the capsule, the alarm rings alarm.
In heavy vehicles and buses (due to large size) manufacturers and some drivers in terms of personal initiative establish additional mirrors to control the "invisible" from the cab seats: rear bumper (and space up to 3 feet away from it), the front bumper and the space of 1.5-2 meters in front of the windshield of the cab, along the sides at the level of 1 m above the ground. All these zones recognized as dangerous and problematic, some even call them "dead zones" control the visibility of the driver of the cab. The use of motion sensors in this case will help to prevent impact to human or animal accidentally or deliberately trapped at the front or rear bumper of the car.
To power the DD in vehicles with a system voltage 24 V is required a simple adapter, for example, the scheme of which is shown in Fig. 2 (or similar).
Other uses motion sensor
DD can also be used as an additional element of security car alarm to prevent theft and burglary. For this DD set in the vehicle, pay (there may be several) sides the most likely occurrence of the person (the offender), and Executive contacts the relay is connected properly in the open circuit starter or ignition car. In terms of connections may be other options, such as - to sound generator (capsule) signaling contacts of the limit switch at the end of the doors, and other contacts involved in the alarm system car; when the opening/closure alarms is and sound and light alert to prevent unauthorized entry into the vehicle Serena or (if available) using the keyfob with notification via radio channel.
Mounted in the interior of the car with DD and connected to the power supply of active elements security alarm (for example, in the supply circuit in parallel with the sensor shock/shock), facing the door at the glass, it will work even at the approach of man to the car for 1.5 - 2 m (sensitivity is adjustable on Board pyroelectric detector DD), which in some cases may to prevent crime, and the warning is better than subsequent correcting the situation. Enable and disable this option as regular signaling - with remote control (keyfob). for the owner of the car.
Of course, for all considered cases, you can use other models of sensors movement, including not having a power supply unit and intended for protection of the premises. Methods of refinement to adapt to the car to them about the same (similar to the above recommendations).
Author: A. Kashkarov