Motion sensors are now sold in almost all the shops of home appliances.Motion sensor lighting is used in everyday life, such as doorways.Of course, you pay attention to the lights that light up when you approach them?This is one example of the use of motion sensors in everyday life, and such examples are many.Movement or motion sensor is used in the home and industrial alarm systems, they are in the schemes of robotics and automation, measuring the speed of the motor, etc.But in addition to industrial use, the motion sensor it is possible to find application in the home.Especially if you make a motion sensor with your hands, knowing the scheme of his work, you can use this device to turn on or off any appliances.
Let's look at the main part of the product.The first thing you need to start to make a motion sensor with your hands, it is to ensure its food.The power supply must first be safe, have a possible small dimensions, and be designed for continuous operation under load.Well suited for this purpose standard power supply to charge the battery or any other with an output voltage of five volts.Make a motion sensor with your hands is quite simple, it does not require scarce or expensive parts.
Now select a photocell, for our purposes, you can use any, the area it has no meaning, a little later, we learn why.The cathode of the photocell is connected to the positive output power supply.Now the current limit detector, it must flow through the current rating, otherwise it will burn.According to Ohm's law, we calculate the nominal resistance, and solder it to the anode terminal of the photocell.
Now Trimpot enough 10K, one of the conclusions sealed minus power, the second - on the free end of the current limiting resistance.Now we collect emmiternogo follower circuit using a transistor with npn transition.The base is sealed at its free end trimming resistance.The collector is directly soldered to the positive terminal of the power source, and the emitter circuit include small power relays, rated voltage of five volts.The other end of the relay coil, we soldered to the negative terminal of the source.The relay contacts are collecting scheme seal-that is, at the first motion detection relay tighten their contacts and will provide their own food.Available relay contacts are on the load, such as lighting or a tape recorder, everything depends on your imagination.As you can see, making a motion sensor with your hands is easy.The main thing in this case - not to overload the contacts because the relay used in the scheme, low-power.But as the load, we can use another relay, with more powerful contacts, which will provide you with the load, what you want.
To reset the device to its original state quite briefly interrupt the power supply.Turn the power circuit in a small momentary switch.The radiation source can use a laser pointer, providing it with a permanent source of our food.Now I understand why the area photocell played no part, and monochrome light pointer beam of light will not change in size.
