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A LED–LED-based photoplethysmography sensor
Physiological Measurement, 2007A high sensitivity, low power and low cost sensor has been developed for photoplethysmography (PPG) measurement. It uses standard light emitting diodes (LEDs) as both light emitter and detector, pulse-based signal conversion techniques instead of the classical analogue-to-digital convertors (ADCs) and a general purpose microcontroller for the ...
Stojanovic, Radovan, Karadaglic, Dejan
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ACM SIGGRAPH 2019 Studio, 2019
Imagine an LED that turns itself on and off in response to light levels, or one that you can blow out like a candle. These are circuits you can build with just an Arduino, a resistor, an LED and a little code. In this workshop, we examine some surprising properties of LEDs to create systems that sense light, temperature and wind.
Paul H. Dietz, Jennifer (Ginger) Alford
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Imagine an LED that turns itself on and off in response to light levels, or one that you can blow out like a candle. These are circuits you can build with just an Arduino, a resistor, an LED and a little code. In this workshop, we examine some surprising properties of LEDs to create systems that sense light, temperature and wind.
Paul H. Dietz, Jennifer (Ginger) Alford
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2014
Your organization is structured around the formal co-operation of employees, customers, and partners for their mutual social, economic, and cultural benefit.
David Cushman, Jamie Burke
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Your organization is structured around the formal co-operation of employees, customers, and partners for their mutual social, economic, and cultural benefit.
David Cushman, Jamie Burke
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LEDs and Use of White LED for Lighting
2014LED is an acronym for “light emitting diode.” The first important fact is that LED is an electronic component, a diode, a component that can conduct current in one direction and not the other. As many other electronics components, controlling a LED is an easy topic, in order to obtain different behavior. Due to the fact that a LED must produce light, a
Reggiani A, Farini A
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SSRN Electronic Journal, 2022
Leading retailers have opened up their online storefronts to competitors by operating marketplaces for third-party sellers. We develop a model of entry and price competition at the product market level to analyze the competitive interactions arising within these retailer-led marketplaces.
Andres Hervas-Drane, Sandro Shelegia
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Leading retailers have opened up their online storefronts to competitors by operating marketplaces for third-party sellers. We develop a model of entry and price competition at the product market level to analyze the competitive interactions arising within these retailer-led marketplaces.
Andres Hervas-Drane, Sandro Shelegia
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LED-to-LED visible light communication networks
Proceedings of the fourteenth ACM international symposium on Mobile ad hoc networking and computing, 2013Visible Light Communication (VLC) with Light Emitting Diodes (LEDs) as transmitters and receivers enables low bitrate wireless adhoc networking. LED-to-LED VLC adhoc networks with VLC devices communicating with each other over free-space optical links typically achieve a throughput of less than a megabit per second at distances of no more than a few ...
Stefan Schmid 0001 +3 more
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Organic LEDs Combined With Inorganic LEDs
Journal of Lightwave Technology, 2011An organic light-emitting device (OLED) is coupled with inorganic LEDs to strengthen the OLED's weak point (i.e., low luminous intensity). To this end, side-view LED bars are deployed on the sides of the glass substrate of OLED. To extract not only OLED light but also LED light from the glass substrate, a microlens array (MLA) film is attached to the ...
Jongwoon Park, Taehyun Ban, Daehyuk Choi
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