3 ms·
Wont the efficiency be ridiculously low -- wifi signals are not really targeted.
by anilgulecha 11y ago
Wont the efficiency be ridiculously low -- wifi signals are not really targeted.
- gus_massa 11y agoI agree, it's ridiulouly low. From the article: > In their proof-of-concept experiments, the team demonstrated that the PoWiFi system could wirelessly power a grayscale, low-power Omnivision VGA camera from 17 feet away, allowing it to store enough energy to capture an image every 35 minutes. I made a back of the envelope calculations for a similar project ( see https://news.ycombinator.com/item?id=10323565 https://news.ycombinator.com/item?id=10323565 ) This other projet claim that they can harvest ~30µW, this is very little. For example, it can only blink a led a few times per minute, because a normal led use 30mW=30000µW. Read the complete comments for more details.