Light Sensing Circuits
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Many people place motion detectors in their backyards or even in their houses so that when they walk through that area, the lights will automatically turn on. Thus, motion sensor lights are very popular and being increased in use. Businesses use them all the....
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This "Super Light Sensor" responds to minute fluctuations in light level, auto-adjusting over the range from about 200 lux up to 60, 000 lux (ie, from a modestly lit room to direct sunlight). It has lots of potential uses - eg, detecting a car entering a....
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This circuit shows how to use an ordinary LED as a light sensor. It makes use of the photovoltaic voltage developed across the LED when it is exposed to light. LEDs are cheaper than photodiodes and come with a built-in filter, which is useful when the....
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If you don`t have an audio detector already constructed, you can use a nice set of audio headphones (closed-cup style, that completely covers your ears) and a 120V/6V step-down transformer to build a sensitive audio detector without volume control or....
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The LDR is a variable resistor whose resistance decreases with increase in light intensity. When the light falling on an LDR has normal intensity, its Resistance is large enough and the voltage across R is insufficient to trigger the SCR. However, when light....
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With the comparator output driving an LED, the next step will be to sense the intensity of the LED. This lab will build a light detector circuit using an op amp and an everyday light emitting diode (LED). It`s common knowledge that when a current flows....
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A light/dark sensing circuit is extremely useful and versatile in a wide range of renewable energy projects from automatic lighting to security systems. In our article Light Dependent Resistor we explained how an LDR can be used in simple circuits to control....
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To describe the performance or work of electronic schematic of Light Detector Robot as like in figure 1 above we can divide into three parts. In sensor, Microcontroller, and driver dc motor. In this part we use LDR as light detector or sensor. LDR will....
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The Motion Sensor Switch circuit is a motion sensor controlled automatic water sprinkler but you can easily add an alarm/light function too. Before beginning the construction contact your nearest electronics component vendor and procure a readymade box-type....
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SB0061 is a pyroelectric sensor module,developed for human body detection. A PIR detector combined with a fresnel lens are mounted on a compact size PCB together with an analog IC (SB0061) and limited components to form the module. High level output (3.3V)....
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As shown in the figure, it isa sensing automatically lightmade by newHN911L pyroelectric infrared detection module. The HN911L integrates high - sensitivity infrared sensors, PIR, amplifiers, signal processing circuit andoutput circuit. Itisable to remote....
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This wide-range light dimmer circuit uses a unijunction transistor and a pulse transformer to provide phase control for the TRIAC. The circuit operates from a 115 volt, 60 Hz source and can control up to 800 watts of power to incandescent tights. The power....
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741 opamp is connected as audio oscillator with Radio Shack 276-677 photocells in feedback circuits. When light strikes PC1, its resistance decreases and frequency of audio tone in headphone decreases correspondingly. When light strikes PC2, which is....
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In the silicon-controlled trigger circuit, cadmium sulfide cell connects the relaxation oscillator before having a sensor to blink in darkroom. That make the speaker emit the warning sound of Ka, Li. The rate of the sound will increase with the quantity of....
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The report gives the reader info related to light sensor, light photoresistor, comparator, and circuit. There are lots of information regarding detection....
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There are many measurement system that would be more suitable if we use logarithmic scale, especially when we try to mimics human sensory response. Most....
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This is a circuit of Low-Light Level Drop Detector. This circuit utilize self-biasing configuration to detect small changes in light level. This circuit....
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Configured with capacitive coupling (by inserting a small cap between photo-transistor and bipolar transistor), this relay circuit will respond only to rapid....
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An audio amplifier connected to the output will emit loud click sound for each lightning strike detected. When severe storms are approaching, this receiver will go crazy - producing hundreds of clicks per minute. This is a direct detection amplified....
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The following circuit is an improved version of my original Lightning Detector designed to run on a 5 volt supply. The new circuit features a superior RF section with a single resonance near 300kHz and plenty of sensitivity. The potentiometer was eliminated;....
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I wanted to add a security/sensor light near the main doorway that would run of 12 volts. You can buy 12 volt PIR sensors, but these are very expensive at over $50 each and designed for security systems. However you can pick up a 240v sensor light for less....
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This is a simple update to Mr. Hareendran s PIR Sensor Security Light circuit. It has a shortcoming limits the relay voltage to approximately 3.3V. While this may function with some 5V relays, it will not function with all. The nature of....
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With two light barriers closely positioned one after the other it is possible to establish in which direction they have been crossed. If, for example, you place it at the entrance of the toilet then you can use it to control the lights: on when entering and....
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