4 ms·

I've thought about this before. WiFi endpoints emit EM radiation, the same as visible light, just in a spectrum that is invisible to our eyes. So they're basica

I've thought about this before. WiFi endpoints emit EM radiation, the same as visible light, just in a spectrum that is invisible to our eyes. So they're basically invisible lightbulbs that shine in a way that transmits information. Theoretically if you had the right type of optical sensor, one similar to a standard camera's sensor but tuned to a different EM frequency, you should be able to build a "WiFi camera" right?

Someone 4y ago
Yes, but since the wavelength of WiFi signals is around 6 to 12cm, you’d need a fairly large sensor (aka ‘antenna’) We also don’t call that ‘optical’ by the way. ‘Optical’ is typically reserved to wave lengths visible to human or animal eyes: anything between the ultraviolet and the infrared.