Recent content by jamesdo

Hi, I have to set up an experiment of Visible Light Communication system in which the transmitter is LED and the receiver is smartphone camera. I just have knowledge about networking and programming. So right now I have no idea how to build a circuit to make the LED blink to represent 0 and 1...

Assume that I have a light bulb with luminous emittance of 160000lux (16ev), and a gray wall with luminous emittance of 300lux (7ev). I take the photo of this bulb and this background. Is there any approximate formula to estimate the gray level or RGB value of the bulb and the background in the...