Method for optical data transmission using existing indicator or illumination lamp
A method is described for the transmission of data using LEDs or other light sources without interfering with the standard use of the lighting source.
1 . A method which allows data to be transmitted optically through an LED or other light source without interfering with the normal use of the light source, comprising
a current shunting device;
a control signal input for the data stream.
2 . The method of claim 1 for making the data transmission not visually detectable.
3 . The method of claim 1 for making the optical data detectable by a wide range of available photo detectors.
4 . The method of claim 1 using a constant voltage power source.
5 . The method of claim 1 using a constant current power source.
6 . The method of claim 1 using MOSFET transistor as a shunt switching device.
7 . The method of claim 1 , using a bipolar transistor as a shunt switching device.
8 . The method of claim 1 shunting a single LED.
9 . The method of claim 1 shunting one of a multiplicity of LEDs.
10 . The method of claim 1 transmitting data using a protocol that provides a fixed percentage on/off ration (duty cycle), such as Frequency Shift Keying, Manchester Encoding, Phase Shift Keying, Pulse Position Modulation, etc.
11 . The method of claim 1 added to an existing product that uses an LED or other light emitting source as either an indicator or illumination source.
12 . The method of claim 1 used to transmit data using a light emitting source which operates normally as a power indicator.
13 . The method of claim 1 used to transmit data using a light emitting source which operated normally as a source of illumination.
14 . The method of claim 1 used to transmit data using a light emitting source which normally operates as a light source for a back-lit LCD screen.