Do you want to tighten your security? Want to know who is entering your room and capture their picture with an old smartphone and Arduino?
Project tutorial by Walid Mafuj
Here we use PIR sensor and Arduino to detect the motion of a hand. This detection can be used to operate electronic equipment.
Project tutorial by ElectroPeak
As the title says, this is a pretty simple PIR motion controlled relay using an Arduino Nano.
Project tutorial by HeathenHacks
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