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Power-over-Wi-Fi: Indian origin scientist develops Wi- Fi based system to power cameras

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Washington: An Indian-origin researcher Vamsi Talla has developed a system, that uses Wi-Fi internet signals to beam power to remote devices such as a surveillance camera.

The system is first of its kind and is known as power-over-Wi-Fi.

The idea is simple in concept. Wi-Fi radio broadcasts are a form of energy that a simple antenna can pick up.

Until now, Wi-Fi receivers have all been designed to harvest the information that these broadcasts carry.

Talla simply connected an antenna to a temperature sensor, placed it close to a Wi-Fi router and measured the resulting voltages in the device and for how long it can operate on the remote power source alone.

Even more ambitiously, the team also connected a camera to their antenna.

This was a low-power sensor capable of producing 174 x 144 pixel black and white images, which requires 10.4 milliJoules of energy per picture.

To store energy, they attached a low leakage capacitor to the camera which activates when the capacitor is charged and continues operating until the voltage drops to 2.4 Volts.

The images were stored in a 64 KB random access memory (RAM). In the subsequent tests, the camera performed remarkably well.

“The battery-free camera can operate up to (about five metres) from the router, with an image capture every 35 minutes,” Talla told MIT Technology Review.

By adding a rechargeable battery, he increased the distance to seven metres.

The router could even power the camera through a brick wall, demonstrating that it would be possible to attach the device outside while keeping the power supply inside.

“The technology would be hugely useful for surveillance, perhaps connected to a movement sensor to trigger the camera when something moves in its field of view,” Talla noted.

The team also connected their antenna to a Jawbone fitness tracker and used it to recharge the battery that powered it.

“Using this, we charge a Jawbone device in the vicinity of the power-over-Wi-Fi router from a no-charge state to 41 percent charged state in 2.5 hours,” the team pointed out.

According to the MIT report, power-over-Wi-Fi could be the enabling technology that finally brings the “Internet of Things” to life. (IANS)

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BSNL Partners with Google to Expand WiFi Footprint

BSNL Chairman Anupam Shrivastav on Friday performed the soft launch of the BSNL – Google Station free WiFi services

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BSNL is providing mobile services in Kashmir. Image Source: www.freejobsinfo.in

On the occasion of World Telecom Day on Friday, state-run telecom major BSNL has partnered with Google to increase access to its WiFi footprint in the country.

With the launch of this service, people across the country will be able to enjoy BSNL’s free WiFi services.

This initiative will allow customers use BSNL’s high speed internet services on WiFi.

BSNL is also taking steps to increase the rural WiFi footprint, promoting the government’s ‘Digital India’ initiative.

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FILE – The Google logo is seen at a start-up campus in Paris, France, Feb. 15, 2018. VOA

“We have been partnering with various technology companies upgrading our platform and increasing our customer reach in this era of ever-increasing demand of high speed internet”, BSNL Director (CFA) Vivek Bansal said.

BSNL Chairman Anupam Shrivastav on Friday performed the soft launch of the BSNL – Google Station free WiFi services.

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There are 38,000 BSNL WiFi hotspot locations operational in India. One can access these by buying WiFi vouchers that are priced starting at Rs 19. (IANS)