Hello, Im very very green to electronics but I can however follow instructions and can soldier ect... Now here is part one of my project, I want to build a sensor for the same reason some fella did in the very short clip I put on my Youtube channel (Link Below). I need it to sense an object like in the video which is brass and then the sensor would rotate out to check the distance from the powder to the sensor and if incorrect sound a buzzer. How can I do this???