IoT & Hardware
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You're reading from  Raspberry Pi Sensors

Product typeBook
Published inApr 2015
Publisher
ISBN-139781784393618
Edition1st Edition
Tools
Raspberry Pi
Concepts
Wearable Tech
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Author (1)
Rushi Gajjar
Rushi Gajjar
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Rushi Gajjar

Rushi Gajjar is an entrepreneur, embedded systems hardware developer and a lifetime electronics enthusiast. He works in the field of research and development of high-speed single-board embedded computers and wireless sensor nodes for the Internet of Things. Prior to that, his extensive work as a freelancer in the domain of electronics hardware design introduced him to rapid prototyping development boards and single board embedded computers such as the Raspberry Pi. In the spare time, he loves to develop the projects on Raspberry Pi including sensors, imaging, data logging, web-servers, and machine learning automation systems. He authored a DIY and hardware based book titled Raspberry Pi Sensors which takes deep dive in developing sensor interfacing based projects with Raspberry Pi. His vision encompasses connecting every entity in world to the Internet for enhancing the human living experience. https://www.linkedin.com/in/rushigajjarhttp://www.amazon.com/Raspberry-Pi-Sensors-Rushi-Gajjar/dp/1784393614/ref=sr_1_9?ie=UTF8&qid=1453884207&sr=8-9&keywords=raspberry+Pi+Sensorshttp://rushigajjar.blogspot.in/
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Introducing the photoresistor (photocell)

Did you know that the RasPi does not have an analog-to-digital (A2D) convertor integrated inside? This is the biggest drawback while using microprocessor-based development boards such as the RasPi. But do not worry; we have a technique to hack it. A photocell or light-dependent resistor (LDR) is a light-controlled variable resistor. The resistance of an LDR decreases with increasing incident light intensity. More the light, lesser the resistance, and vice versa. The variations in the values vary by about 45 percent, and they shouldn't be used to try to determine precise luminance levels in candela or lux.

Appearance wise, the sensor has a clear shiny, thin surface of glassy material on the top and has two terminals. On the top, there is a photosensitive semiconductor material that is sensitive to light, and we can see the tracks routed in a zigzag pattern.

It's time to introduce you to some mathematics of resistors and capacitors. Understanding the...

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Raspberry Pi Sensors
Published in: Apr 2015Publisher: ISBN-13: 9781784393618
© 2015 Packt Publishing Limited All Rights Reserved

Author (1)

author image
Rushi Gajjar

Rushi Gajjar is an entrepreneur, embedded systems hardware developer and a lifetime electronics enthusiast. He works in the field of research and development of high-speed single-board embedded computers and wireless sensor nodes for the Internet of Things. Prior to that, his extensive work as a freelancer in the domain of electronics hardware design introduced him to rapid prototyping development boards and single board embedded computers such as the Raspberry Pi. In the spare time, he loves to develop the projects on Raspberry Pi including sensors, imaging, data logging, web-servers, and machine learning automation systems. He authored a DIY and hardware based book titled Raspberry Pi Sensors which takes deep dive in developing sensor interfacing based projects with Raspberry Pi. His vision encompasses connecting every entity in world to the Internet for enhancing the human living experience. https://www.linkedin.com/in/rushigajjarhttp://www.amazon.com/Raspberry-Pi-Sensors-Rushi-Gajjar/dp/1784393614/ref=sr_1_9?ie=UTF8&qid=1453884207&sr=8-9&keywords=raspberry+Pi+Sensorshttp://rushigajjar.blogspot.in/
Read more about Rushi Gajjar

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