I have connected 8 pins of the sensor to 8 digital pins of arduino but I don't understand where to connect the "led on" or "IR" pin of the following sensor.
You've told us almost nothing, and posted in a forum section that specifically asks you not to (I moved it for you)
It's not going well...
Me too.
We need some additional information.
Post your sketch, well formated, with well-tempered comments and in so called code tags "< code >" and a detailed circuit diagram to see how we can help.
Have a nice day and enjoy coding in C++.
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