Hi, I’m Hang Yu

My project is to make a reliable visitor counter for our makerlab in Business Faculty building. I am going to use is Arduino uno.

First,The idea is let a laser diode constantly point at a photosensor placed on the breadboard*

What you need:

1, arduino compatible photosensor

2,LED at pin#13 to notify if it’s blocked

3,10K resistor

4,Arduino uno

Plus, Second, it would be great to build a LCD screen displays the number it counts:

Third, the circuit of laser diode is independent from Arduino and it’s easy to build on bread board.

I am going to work on my project during the summer break.