Motion Sensor Components In Electronics

Perhaps we never got into a huge mall with automatic door open as we approach the door? that is one of the application components of the motion sensor in the electronics. Components that can detect movement commonly referred to as PIR or Passive Infrared Sensors.

PIR sensors can detect small movements of this and also feel if there is any man who moved out of range sensor.

For those of you who do not know this motion sensor PIR, its small, low power consumption and not easily worn away with quite a hefty hargayang. Also called PIR is also called Pyroelectric IR or motion. Not to be confused with the light sensor that yesterday I had a chance to discuss also, both are often used in a series of sensors. This is a form of censorship of PEARS:

How does it work? PIR motion Sensor works by measuring infrared energy that is detected by sensors that exist therein. They do not emit infrared itself so it is referred to as passive. Whereas in ordinary IR sensor, usually needed an infrared beam/laser as an indicator of the existence of light detected. Think about it like this way of working motion sensors:

Infrared energy is produced by heat, humans and animals including can produce heat even though small, an average rate of 9-10 micrometer infrared energy.

Usually range motion sensor this can reach 5 meters. Quite effective as a motion sensor is not it? Also note how the image above, this sensor PIR can't detect how much the number of people who were in the area range of the sensors, can only feel a change in heat energy/infrared only.

How much is a motion sensor PIR? If you are interested in based on the info I get the price could range anywhere between 200 thousands. Quite expensive, but in the hands of people who are creative, can be useful tools/missing .

Light Sensor Components

Light Sensor is a sensor that allows you to detect light and then convert it into signals to electrical signals are then used in a missing that use light as a triggernya.

There are several commonly used light sensors for example LDR (Light Dependent resistor), photo Transistor or a diode and a PhotoTransistor, Photodiode, photo/component this component is widely used in electronic circuits. The following is a more detailed explanation of each light sensor:

LDR

Photo resistor/photoresistor/ LDR is basically a resistor whose resistance value (in ohms) depending upon how much of the light that falls onto the surface of the sensors are.

The workings of this LDR is resistance will increase when it is not exposed to light (night) and will turn into a small resistance when exposed to light (daylight), LDR is typically combined with some transistor for membentul series automatic headlights. Fortunately there is no special code to read the value of the resistor is this light

Photodioda

Photo diodes or commonly referred to as Photodioda is a type of diode component which is capable to detect light. As well as ordinary diodes, this component has a P-N, it's just made sensitive to light.

This type of light can affect the diode of this photo which is infrared light, sunlight, ultra violet and x-rays. The use of the photo diode is very varied, as the countdown the number of vehicles on the highway automatically, as the light meter in digital cameras as well as the sensor on the equipment in the medical field.

Phototransistor

Next is a photo Transistor or Phototransistor. Phototransistor is simple is a bipolar transistor using contact (junction) base-collector who became a surface so that it can receive the light so it could be functioned as light sensor.

Phototransistor has better sensitivity when compared to diodafoto, this is because Electrons are generated by photons of light at the foot of the injeksikan junction in at the Base of the transistor to later reinforced at the foot of C/Kolektornya.

The disadvantage is, the response of the light Sensor Phototransistor will slower compared to a diode-photos.