Electronic components are useful!

Please forgive my ignorance, I was a young boy once, and my mind was set on studying art. I was doing alright, and got into (long story) physics scholarship programme at my university before leaving it...
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Arduino starter kit is here

Some time ago, I got an invitation to join a website called instructables.com. I came across this website few times in my googling sessions in the past, looking for some answers, but never actually published...
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Raspberry PI sensors

Sensors for RPI - overview
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Infrared Sensor HC-SR501 PIR Motion Sensor for a Raspberry PI...

How to use PIR sensor with your Raspberry PI.
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Sonar HC-SR04 ultrasonic ranger for a Raspberry PI & Arduino

How to connect sonar to raspberry pi.
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