A sensor whose resistance changes based on the amount of light it senses.
Description:
This device is a variable resistor that reacts to light.
How It Works:
When light energy contacts the sensor, the material absorbs some of the light energy and converts it to electrical energy, becoming less resistive.
Connect It:
A resistor has two wire leads, and should be connected in series with the device it's meant to control. Photoresistors are not polarized, which means you can connect them either way around.
How It Is Used:
Select the device during simulation to show a slider representing light level. Slide the target to change the simulated light level.
Get Started:
Select the device during simulation to show a slider representing light level. Slide the target to change the simulated light level.
More About Photoresistor:
To add a Photoresistor in Tinkercad, search for "Photoresistor" in the component library, drag it onto your breadboard, and connect its terminals with wires to other components in your circuit. You can then click on the Photoresistor to set its name for easy identification.
Photoresistors, also known as LDRs (Light Dependent Resistors), are components whose resistance decreases as the amount of light hitting them increases. These light-sensitive resistors are commonly used in applications like light meters, automatic lighting systems, and optical devices. The two main types of photoresistors are silicon-based and cadmium sulfide (CdS), with CdS being the most widely used due to its sensitivity to visible light. Key specifications of photoresistors include their resistance range, typically from a few megaohms in darkness to a few hundred ohms under bright light, with values varying based on light intensity and the specific model. The spectral response is usually defined by the range of light wavelengths the photoresistor is sensitive to, with typical ranges spanning from 400 nm to 700 nm (visible light spectrum). Power ratings are generally low, with maximum ratings ranging from 0.1W to 0.5W, ensuring they operate safely without overheating. Response time can vary, but typical values range from 10 ms to several seconds, depending on the design and materials used. The working voltage for most photoresistors is relatively low, often around 0.5V to 5V. The measured units for these parameters are ohms (Ω) for resistance, watts (W) for power, and seconds (s) for response time. Additionally, operating temperature ranges for photoresistors typically span from -40°C to +85°C, allowing for use in various environmental conditions.
1. Electronics Tutorials
Website Title: Electronics Tutorials
Website Page URL: https://www.electronics-tutorials.ws/io/photoresistor.html
URL recommended for: A thorough explanation of how photoresistors work, their types, and practical applications. Great for beginners who want to understand the fundamental concepts of light-dependent resistors.
2. All About Circuits
Website Title: All About Circuits
Website Page URL: https://www.allaboutcircuits.com/textbook/semiconductors/chpt-7/photoresistors/
URL recommended for: Detailed theory and practical knowledge about photoresistors, including their physical properties, applications, and how they are integrated into circuits. Suitable for both beginners and intermediate learners.
3. Digi-Key Electronics - Photoresistors
Website Title: Digi-Key Electronics
Website Page URL: https://www.digikey.com/en/products/filter/photoresistors/748
URL recommended for: A large selection of photoresistors with detailed specifications and datasheets. Ideal for those looking to purchase components or dive deeper into technical details and product options.
4. RS Components - Light Dependent Resistors
Website Title: RS Components
Website Page URL: https://uk.rs-online.com/web/c/semiconductors/optoelectronics/photoresistors/
URL recommended for: A variety of photoresistors and related components with datasheets and product specifications. Great for understanding different product types and selecting components based on their needs.
5. Adafruit - Light Sensors
Website Title: Adafruit
Website Page URL: https://learn.adafruit.com/photocells
URL recommended for: A beginner-friendly tutorial on photoresistors (photo cells), including basic concepts and project ideas. Excellent for hands-on learners looking to implement photoresistors in their DIY projects.
6. SparkFun Electronics - Light Sensors
Website Title: SparkFun Electronics
Website Page URL: https://learn.sparkfun.com/tutorials/light-sensors
URL recommended for: A comprehensive guide on light sensors, including photoresistors, with tutorials, examples, and project suggestions. Perfect for those interested in practical applications of photoresistors.
7. NTE Electronics - Photoresistors
Website Title: NTE Electronics
Website Page URL: https://www.nteinc.com/category/photoresistors
URL recommended for: A catalog of photoresistors with detailed technical specifications, useful for learning about various types and selecting the right component for a project.
8. Learn Spark - Using Photoresistors
Website Title: Learn Spark
Website Page URL: https://learn.sparkfun.com/tutorials/using-light-sensors
URL recommended for: A tutorial-focused resource that teaches users how to use light sensors, including photoresistors, in projects with clear explanations and practical examples.
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…till next post, bye-bye & take care.
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