Can somebody help me with a problem i am facing ?
I am using a 56khz IR receiver and an standard through hole IR led as a proximity sensor.
not exactly my led but very similar to this.
the vf on led is 1.2 v and my vcc is 3.3 v . i am pumping 30 mA of current to LED.
The position of the receiver is on the top of pcb and position of my IR led is exactly below the emitter on the bottom side of pcb. the height of the receiver from the ground is 23 mm. the emitter and receiver is exactly at the near to the edge of pcb so the receiver is not sticking out.
I am modulating the data at 56 Khz carrier frequency that I need to send and sending it through the IR led.
Now the problem is my Receiver is picking up my sent signal.
the only time it should do is when the something is in front of the board and ir light bounces of the the object and signal picks it.
i am testing in a dark room with no direct sunlight . only tube light is present.
I have tried following things but none of them have worked till now.
I have tried using a right angled led. as its light emitting direction is forward instead of a all around of a normal led.
I have tried wrapping the normal and right angled led the black paper.
I have tried shifting the led backward.
I have tried covering the floor with black paper.
I have also tried the board upside down so the RX in on the bottom side and led is on the top side.
i even tried covering the led and RX with my hand to but still it is receiving