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A photocell is a circuit element inside the ambient light sensor (ALS) that converts incident radiant energy into an electrical signal for daylight harvesting or dusk-to-dawn control. It's also referred to as a photosensor or photocontrol which, however, technically describes the whole sensing system.
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An outdoor lighting photocell sensor is a device that is used to detect changes in ambient light levels and turn on or off the outdoor lights accordingly. These devices are typically used in residential, commercial, and industrial applications. They are designed to help reduce energy consumption and costs associated with outdoor lighting.
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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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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.
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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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Photocells are sensors that allow you to detect light. They are small, inexpensive, low-power, easy to use and don't wear out. For that reason they often appear in toys, gadgets and appliances. They are often referred to as CdS cells (they are made of Cadmium-Sulfide), light-dependent resistors (LDR), and photoresistors.
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