i try it wi th and without ambient light......the same result us acheived.Assuming your IR LEDs are operating, you may have a problem with ambient light. Some conventional lights fixtures can emit a small amount of IR light. If you happen to be testing the circuit in an area that has some ambient IR light, the circuit may end up being triggered by this ambient IR light source. It may be worthwhile to test your circuit in a low light environment in case that is preventing your detector from working properly.
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