I'm trying to build an IR proximity sensor using a simple tutorial found online. Here is the schematic
and here is the link of the tutorial : https://www.instructables.com/id/IR-Proximity-Sensor-1/
I wired it using solder lines and checking it with a multi-meter doesn't show any short.
there is a video which demonstrates how it works and it works for them (They used 2 IR LEDs). Here is the video link : https://www.youtube.com/watch?v=y83o_gfQRN8&feature=emb_title
But when activating it, the LED only turns on, the IR sensor and Photodiode doesn't give any impact from the output whatsoever. Giving it an opaque barrier doesn't help and turning the potentiometer slightly down only turns it on and off.
Reading the output signal with a serial plotter in arduino gave me these results :
As you can see, there is a point where the output rose up dramatically. That's the point where the potentiometer turns on the LED, while the point where it is at zero is the near exact point the LED turned off while turning the potentiometer. It only has like less than a degree difference. Putting my hand near and far the IR receiver-transmitter doesn't change the output even the slightest. Any suggestions? Is it possible that the potentiometer i am using is the wrong kind or is it possible the photodiode does not give a strong enough signal?
