Good morning,
I am building a project using IR LED to communicate with a vs1838 IR sensor via NEC protocol.
I studied very well the circuitry of a simple tv remote control and I am wondering why the sensor reads the signal from my LED only if it's just 2-3 meters away from it and while looking straight at the receiver. Insead, if I use the remote, it seems that it can send data from every angle and every distance .. also 10meters or more.
Supposing my code generated from arduino to emulate the NEC protocol (at 38 kHz frequency)is correct (and it does), what could be the problem?
I am driving the LED with a npn transistor (as in the remote control) at 40-50 mA of current, which I think is fair enough.
Why is it so hard for my led to communicate with the sensor? Any advice?
Thank you in advance.
PS : Could it be that tv remote controls have an optimal shape at the emitter, so that the beam is spreaded all over the directions?
https://ak.picdn.net/shutterstock/videos/10017164/thumb/1.jpg
I am building a project using IR LED to communicate with a vs1838 IR sensor via NEC protocol.
I studied very well the circuitry of a simple tv remote control and I am wondering why the sensor reads the signal from my LED only if it's just 2-3 meters away from it and while looking straight at the receiver. Insead, if I use the remote, it seems that it can send data from every angle and every distance .. also 10meters or more.
Supposing my code generated from arduino to emulate the NEC protocol (at 38 kHz frequency)is correct (and it does), what could be the problem?
I am driving the LED with a npn transistor (as in the remote control) at 40-50 mA of current, which I think is fair enough.
Why is it so hard for my led to communicate with the sensor? Any advice?
Thank you in advance.
PS : Could it be that tv remote controls have an optimal shape at the emitter, so that the beam is spreaded all over the directions?
https://ak.picdn.net/shutterstock/videos/10017164/thumb/1.jpg
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