Once again, all of these materials can usually be found in any starter electronics kit, so take stock of what you already have. It’ll also be helpful to have a breadboard handy for prototyping this project. You’ll also need to source a USB Cable if you haven’t got one lying around that is! To help further reduce resistance running through the photoresistor, bringing down its value down to a more usable level For now, we’ll focus solely on how to use the sensor itself. For example, if you want to control blinds, you’ll need some servos, whereas if you’re controlling a lamp, you’ll need a relay. However, it’s worth keeping in mind any larger projects that you might want to control using your photoresistor. What You’ll Needįor this project, you won’t need much that doesn’t come in a standard electronics kit. To demonstrate how they work, we’ll control two LEDs, turning one on when there’s light out and another when it’s dark. If you’ve bought an electronics kit, you’ve probably got one or two sitting around. Photoresistors are small, cheap, and they often come in beginner’s kits and packs of other sensors. You could use this to open your blinds when it’s bright outside or turn on a lamp when it gets dark.

With this information, you can make your project respond differently to bright daylight, waning dusk, or pure night.

This resistance can then be read by the Arduino’s analog pins to return a value between. In contrast, when there’s less light in an area, the resistance increases. While typical resistors impede the flow of electrons through a circuit at a constant level, photoresistors allow higher voltages to pass through a circuit when there’s more light hitting a sensor. A photoresistor is a type of resistor that changes its resistance level in response to the amount of light that hits it. How Photoresistors Workįor this project, we’ll be focusing on photoresistors and how to incorporate them into your projects. But wouldn’t it be more convenient if they could do so automatically? With photoresistor sensors and an Arduino, you can control lamps, blinds, or just about any other project based on the ambient lighting around you. When the sun goes down, and it starts to get dark in your house, you might need to turn on a few lights to see.

Projet arduino photoresistance et led