Optical trigger for speed measurement

Projects General Guidance
1

Hello fellow Tinkerers,
I have being trying to make a board that measures speed by using s=d/t
I want to make a Optical trigger for my arduino so it can take a precise time how long it will take to go from one side to the other. I will use two light interrupters(http://www.altronics.com.au/p/z6326-light-interrupt-breakout-board/). I want the time to be displayed on a LCD. I have no idea for the code. Can anyone help?

Thanks, Till
The attached image is the wall that has a dsitance of 7.5 cm per Strip.!

2

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3

With the correct formula s=dd/dt, you have to measure dd (distance between ligth barriers) and dt (time between sensor signals).

4

Ok, thanks DrDiettrich

Would you be able to construct an outline as to what my code must contain, and how things interact with each other. Im quite new to arduino and need lots of help,

Thanks,
Till

5

You'll have to read the sensors using digitalRead, get the time using millis() or micros(), then print() the result to Serial.