The 100hz is the requirment of this project..100 Hz is probably too slow for optimal response. Review receiver datasheet about maximal burst length. What's the transmitter current?
Quite expectable when there is a current limiting device.I tried to connect 2 leds in parallel but it didnt really helpd me.
This is my current circuit.Hi,
Quite expectable when there is a current limiting device.
For a detailed answer we need to see the circuit.
Klaus
The 100hz modulation i'm creating with the software. At short distances i see it at the scope.It's not 100 Hz modulation. Please clarify the used pattern.
Hi,
Did you design the circuit on your own?
Dud you verify voltage drop across the resistors with the scope?
Driver circuit:
* let's assume the supply voltage is 5.0V and stays constant (verify both with a scope)
* let's assume V_CE_on is 0.5V
* let's assume the LED_voltage is 1.4V (don't know what type you use)
Then the LED current should be limited by the resistors to (5.0V - 0.5V - 1.4V) / 5Ohms = 3.1V / 5Ohms= 0.62A
--> I guess there's something wrong with my assumptions...
Paralleling diodes will not give much benefit. Since the voltage drop across parallelde diode does not change that much ..
This means the total current does not change that much, either.
Thus the ammount of light does not change that much.
Klau
Means the kHz pattern shown in post #5 is not sent by the IR diode but generated by the receiver? This supports my doubt that the receiver isn't suited to process bursts of 5 ms duration.The 100hz modulation i'm creating with the software. At short distances i see it at the scope.
You did not react on: lens, reflector, different IR system, face to face.... please give feedback what is possible, or not, and why..How do you think i can change the circuit in order to increase the range?
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