Scientists make cheap sensors to reduce energy consumption by detecting carbon dioxide in the room.

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Technologies that automate home functions, such as smart lights and thermostats, can not only make home operation more convenient, but also avoid a lot of energy waste. Scientists at Purdue University in the United States put forward another interesting proposition in this field. They developed an inexpensive sensor, which can identify when people enter the room by the carbon dioxide content in the air, thus helping people adjust the heating and ventilation system accordingly.

Jeff Rhodes, a professor of mechanical engineering at Purdue University School of Engineering, said that climate control and proper ventilation are particularly important because most people spend much more time indoors than outdoors. Climate control and ventilation are also huge sources of energy consumption in the United States and around the world.

Rhoads led a team of engineers to develop a new sensor that can help automate these processes while avoiding the use of camera motion detectors and the privacy issues they bring. The sensor uses hybrid sensing technology to track the level of carbon dioxide in the air, and its sensitivity is enough to detect a spike signal, which can indicate that someone is breathing in the room.

We use our innovative equipment to make use of two technologies: vibration sensing and resistance sensing, said Rhoads, a leading sensor researcher and director of Ray W. Herrick Laboratory at Purdue University. We use them in combination to detect carbon dioxide. This is a good alternative to the prior art, because the prior art may not be able to reliably measure carbon dioxide while maintaining competitiveness in terms of cost and power consumption.

Researchers believe that this low-cost sensor can work with heating and ventilation systems to automatically adjust indoor air only when needed, instead of wasting energy in uninhabited rooms. According to the team, this may prove particularly useful in large office or hotel buildings, but it is also valuable for ordinary families.

At present, the team is studying how to combine sensors with other Internet of Things technologies and applied for a patent.

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