光線傳感器 模擬傳感器 互動(dòng)媒體

     新推出的Light Sensor是基于半導(dǎo)體的光電效應(yīng)原理所開發(fā)的光線傳感器，其可用來對(duì)周圍環(huán)境光的強(qiáng)度進(jìn)行檢測，結(jié)合各種單片機(jī)控制器可實(shí)現(xiàn)光的測量、光的控制和光電轉(zhuǎn)換等功能，此傳感器插針接口，可通過傳感器連接線（不分模擬與數(shù)字連接線）與傳感器擴(kuò)展板結(jié)合使用，可以制作光感相關(guān)的互動(dòng)作品。

What is a photocell?
Photocells are sensors that allow you to detect light. They are all, inexpensive, low-power, easy to use and don't wear out. For that reason they often appear in toys, gadgets and appliances. Theys are are often referred to as CdS cells (they are made of Cadmium-Sulfide), light-dependent resistors (LDR), and photoresistors.

Photocells are basically a resistor that changes its resistive value (in ohms Ω) depending on how much light is shining onto the squiggly face. They are very low cost, easy to get in many sizes and specifications, but are very innacurate. Each photocell sensor will act a little differently than the other, even if they are from the same batch. The variations can be really large, 50% or higher! For this reason, they shouldn't be used to try to determine precise light levels in lux or millicandela. Instead, you can expect to only be able to determine basic light changes

For most light-sentsitive applications like "is it light or dark out", "is there something in front of the sensor (that would block light)", "is there something interrupting a laser beam" (break-beam sensors), or "which of multiple sensors has the most light hitting it", photocells can be a good choice!

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