?Understanding signals 38 kHz ir
I have checked the wiring and programming very carefully. Both are ok. Still the picture on the scope is not right. The detector never gives a stable wave in response to an object. In fact, the presence or absence of an object makes no difference at the output. I ran another program to sweep through a wide range of frequencies. First I placed an object where it would be detected. Got a good strong stable recognition signal at 45.55 kHz. The difficulty now is that the recognition signal is still not affected by the presence or absence of the object. First I pointed it up in midair. No help there. Next I placed the led on a lead and held it enclosed in my fist. Still a strong detection signal. Perhaps there is some other source of ir at that freq. With the led enclosed in my fist and the detector pinched between finger and thumb (all ir paths blocked?) still recognition. What is triggering the detector? After all was put away I thought of replacing the led with a resistor so the circuit could still function the same, but with no possibility of ir being generated. Thoughts?
Comments
I assume that the 45550 hz would have some 'noise' components that would couple through to the IR-Detector. When a strong reflection is made, then the IR-Detector is 'forced' not to detect.
The point being, you want to operate devices in the manner in which they were designed to be operated, because that's the way of reliability and predictability.
Gr,
Mightor
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