ok should I connect another IR LED to another Vcc pin, or parallel to the one i already have?
I think if I added it in parallel to the existing circuit, that will just result in the current being split between the 2 IRs and not so effective.
As for the IR LED emitters that have a focused range of emission, can I "make" that by putting a cone around my existing IR or is there something internally different in those focused IRs that makes them special?
You could place them in series and use a lower value resistor, 100Ω (replacing the other).
I find that my TV remote doesn't work as good from further away by pointing it (like a ray gun).
It does better if I point at me, at an oblique angle.
ok so replace the 200 ohm resistor in vcc-IR, with another IR and change R3 in your shematic (200 ohm resistor) with a 100 ohm.
In case there's any doubt as to my meaning --
PE - I re-did the schematic (something got cut out). Clarity, Always Clarity.
Infrared remote controls for common household appliances use an amazing current through the IrLED.
I have seen many infrared remote controls that use a current that reaches 0.3A with a 5mm LED.
The rated current under pulse conditions is used instead of the continuous rated current.
The carrier wave is modulated to 1/3 duty of 38kHz.
It probably does not match the pulse measurement conditions in the data sheet.
However, I have seen many such products.
A single IR LED with 10mA LED current should already be enough to bridge 5 feet.
There could be something else wrong, like the wrong LED or the wrong carrier frequency.
A simple way that should be able to bridge 5 feet is two IR LEDs and a 100 ohm resistor in series,
and connected between the Arduino output and ground. No transistor.
Leo..
wawa, you say 2 IR leds and a 100 ohm resistor between arduino and ground but i have them between Vcc and the transistor. Do you have a schematic for what you're proposing please?
Active transmit pulses are a logic HIGH on the Arduino pin.
The transistor was inverting that, so LED string had to go between 5volt and collector.
(pin+base HIGH, collector LOW, LEDs powered from 5volt to collector)
Without the transistor, the LED string must go between pin and ground.
(pin HIGH, current through the LEDs to ground)
Leo..
Yes.
Do you have a link to the IR LEDs you bought?
Leo..
OK let's see if this works:
AIRSUNNY three Legs 5 pairs Infrared Diode LED IR Emission and Receiver https://www.amazon.com/dp/B00EFOQEUM/ref=cm_sw_r_cp_api_glt_fabc_X6SMP878HQGYMTHB3D5H?_encoding=UTF8&psc=1
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