KY 008 Laser diode | 37 in 1 Sensor Kit

In this video, I've shown how to work with Laser diode module KY 008. We can get this from 37 in 1 Arduino sensor kit package.
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[@omaaka]

I need a complete guide on the arduino components to buid an automated railway crossing using gsm and gps technology, please help me

[@valeriuantochi6679]

Not all the people are profesionals. Pls, more detailles !

[@illuminati_wolf]

What's the purpose of the middle pin?🤔

[@EEWave]

It is useless.

[@tonyrogers7513]

It is signal pin, you use it with any condition based cases, like with an Arduino board, raspberry pi