I am assembling a proximity IR Sensor using TSOP instead of a photodiode. I followed the diagram below. When I tested the circuit, and put my hand close to the IR LED, the receiver receives the signal in just one second, from 0.7 V to 5 V instantly.
How can I make a low output constantly if my hand is close to the IR LED? Please tell me what is wrong. I am using a TSOP VS1838b as the receiver and an IR LED using a 555 IC transmitter operating at 38 kHz.