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Can we increase the range of IR transmission and reception just by increasing the number of transmiting LEDs. More the transmitting LEDs more the power emitted so the range should increase. Say if one IR LEDs range is (say ) 10m then putting 4 LEDs should give the range of 20 m as the power/intensity received by the receiver in both the cases will be same.
i have experimented by connecting 2-3-4 IR LEDs in series and parallel but did not get any improvement
it depends upon modulation technique, input current, doping material of LED and many more factors that even I dont know. 10 m is enough range for domestic applications
Hi Ashutosh,
What should be done is to find a method to improve the brightness of the light emitted by the LEDs. Using ten or hundred LEDs glowing with normal brightness just wont do any good. Glow a single LED with a brigthtness much higher than normally it would glow. It can be done by passing high current through LED, but to prevent the LED from getting damage, restrict this high current period to a few milliseconds only in every seconds.
u r right. n whar u r talking about is to apply PWM to LED. but in that case also you can not apply more than rated current (absolute max rating) to LED. IR LEDs have around 50 mA current rating. so with 5V input and around 100 ohm resistance in series will lit the LED with full brightness. and it gives max range.
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