I would like to recreate a infrared concept used by in the vacuum cleaning robot's charging station.
I would like to use 3 infrared transmitters all in same wave length and transmit a synchronized bit pattern (on, off, gap duration).
All the led's will in sync and sending a fix and repetitive sequence e.g.: Led A would send 11110001 Led B would send 11110010 Led C would send 11110100
The next step is to assign each Led a max Transmission distance e.g.: Led A => max 4 ft Led B => max 8 ft Led C => 12 ft
Theoretically speaking a IR receiver would get: 11110100 from 8-12 ft range 11110110 from 5-8 ft range 11110111 from 0-4 ft range
The question is, how can i limit an IR distance ? It's not necessary to be exact intervals, instead we can use relative fractions 1, 1/2, 1/4 the idea is to know the distance from the base.
Do i need different transmitters, if yes what i need to take in consideration in the datasheet ?
Changing the frequency e.g. 38Khz does increase or decrease the distance ? But having different frequencies does not affect the receiver capture ?