61–70 of 70 posts
I invented a coffee machine which works using 10000 times less power: it works by deferring the actual coffee making to another machine you plug into another wall socket.
The coffee maker still makes coffee, but it doesn't do the expensive heating of water.
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100' is a very low distance for real IoT applications I've run across
A directional antenna at the active wifi radio would enable longer range. One interesting application would be the ability to dogleg a wireless connection between points A and B where there is no LoS to each other, but both have LoS with point C. It would be a low throughput link, but it would allow for an awesome implementation of a private two way communications system. I.e. Several miles without direct LoS between…
Earlier quoted context omitted.
A directional antenna at the active wifi radio would enable longer range. One interesting application would be the ability to dogleg a wireless connection between points A and B where there is no LoS to each other, but both have LoS with point C. It would be a low throughput link, but it would allow for an awesome implementation of a private two way communications system. I.e. Several miles without direct LoS between…
This is already a thing, however data rates tend to be slower
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I've looked at the paper [1], but I can't figure out how this is different from backscattered RFID with 802.11 on top. The paper says RFID requires a full-duplex radio while the WiFi chipset is orders of magnitude less expensive. Are they modulating differently or is there some RF magic? [1] http://passivewifi.cs.washington.edu/files/passive_wifi.pdf
Passive RFID is powered by the incoming radio waves that is 1000x stronger than the signal transmission energy from the RFID tag. There is no statement to the power requirement for passive WIFI from an active WIFI power source. The active WIFI transmitter may require outputting radio waves many times more powerful in order to receive a signal transmission from the passive wifi device. edit: For that reason, I'm not t…
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In case someone is wondering 'Jeeva' (pronounced as Jeev) means living thing in Hindi.
To add, Jeeva means living thing in Malayalam, another language from the south India. In fact, Jeeva is a common name in Kerala and Tamil Nadu, two states from the south India. [1] https://en.wikipedia.org/wiki/Malayalam
I invented a coffee machine which works using 10000 times less power: it works by deferring the actual coffee making to another machine you plug into another wall socket.
Maybe a coffeemaker that uses way less power, but it gets the hot water from another source. The coffee maker still makes coffee, but it doesn't do the expensive heating of water.
Earlier quoted context omitted.
I've looked at the paper [1], but I can't figure out how this is different from backscattered RFID with 802.11 on top. The paper says RFID requires a full-duplex radio while the WiFi chipset is orders of magnitude less expensive. Are they modulating differently or is there some RF magic? [1] http://passivewifi.cs.washington.edu/files/passive_wifi.pdf
The technology is ~50 years old, and was originally invented by the Soviets to eavesdrop on the US embassy in Moscow. https://youtu.be/mAai6dRAtFo?t=9m35s https://en.wikipedia.org/wiki/The_Thing_(listening_device) TL;DR Using a passive antenna to modulate a directed microwave emission.
This article is a few months old. The technology is now being commercialized by the same authors, as Jeeva Wireless: http://www.jeevawireless.com/
Earlier quoted context omitted.
The technology is ~50 years old, and was originally invented by the Soviets to eavesdrop on the US embassy in Moscow. https://youtu.be/mAai6dRAtFo?t=9m35s https://en.wikipedia.org/wiki/The_Thing_(listening_device) TL;DR Using a passive antenna to modulate a directed microwave emission.
Wow that's interesting, how did they find "The Thing"?