The author described briefly about the challenges involved in combining a light sensor with a LED.Like we know that combining a mic and a loud speaker in a audio system will bring a big howling sound due to acoustic feed back. Many techniques are adopted to reduce the same or totally to remove it. Similarly combining a light sensor with a LED also will produce a lot of light feed back.
Replay available now: A handful of emerging network technologies are competing to be the preferred wide-area connection for the Internet of Things. All claim lower costs and power use than cellular but none have wide deployment yet. Listen in as proponents of leading contenders make their case to be the metro or national IoT network of the future. Rick Merritt, EE Times Silicon Valley Bureau Chief, moderators this discussion. Join in and ask his guests questions.