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A photoresistor (also known as a photocell, or light-dependent resistor, LDR, or photo-conductive cell) is a passive component that decreases resistance with respect to receiving luminosity (light) on the component's sensitive surface.
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A photocell sensor is a photodetector that can sense light. The electrical device functions like a timer because it switches light fixtures on or off automatically. However, it doesn't do these actions using a pre-set time. Instead, it senses natural sunlight to control the switching for the artificial light fixture. A photocell.
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A photocell sensor is an electrical device that hooks up and communicates with a transformer. Photocell sensors work like a timer switch in that they power light fixtures off and on automatically during a set "time".
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This is a very small light sensor. A photocell changes (also called a photodetector, photo resistor, CdS or photoconductive cell) resistance depending on the amount of light it is exposed to.These little sensors make great ambient light triggers (when light in the room turns on, do something).
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Also, each sensor will be different. As the light level increases, the analog voltage goes up even though the resistance goes down: Vo = Vcc ( R / (R + Photocell) ) That is, the voltage is proportional to the inverse of the photocell resistance which is, in turn, inversely proportional to light levels.
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The resistor is connected between A0 and ground creating a voltage divider with the photocell. This allows us to get a light intensity reading in our firmware. The TMP36 sensor needs a connection to GND and 3.3V and the output can be connected directly to pin A4 of the Photon. The Piezo Buzzer is simply connected between D3 and ground.
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A Light Sensor generates an output signal indicating the intensity of light by measuring the radiant energy that exists in a very narrow range of frequencies basically called "light", and which ranges in frequency from "Infra-red" to "Visible" up to "Ultraviolet" light spectrum.
