First of all this machine is design to be indoor where the level of ambient light is low so that our infrared sensor can work properly.
Secondly the infrared detect the user presences not his hand.I did this by locating the sensor underneath the kitchen sink where is expected for him/her to stay.
Thirdly along my way to deliver this awesome project we had an accident thank God I was preserved. Well done
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Thank you for taking the time replying to my comment.
And good thing you did not have any serious injuries when the accident happened.