Really need help on project!!! Urgent please read

[Jacobthompson]

Hi everyone,

Back in school I used a machine that was able to count every time something passed it.
A example would be a pendulum swinging. If the sensor was in the pendulums rest position and the pendulum is swing, it would count every time it passes the laser? Sensor? Nothing mechanical touching it.

I am in need of someone who can help me or point me in the direction of someone who can make one of these, a very simple design but smaller. Much smaller.

I would love to give you the name of the device, it was some sort of logger. But I'm just not sure.
I have a pretty big project in mind and would really like to include you if you know what your doing.
Any help would be greatly appreciated.
Jacob 0411250431

 

[tpetar]

Maybe something with Hall sensor/switch.

 

[jiripolivka]

For the same purpose I found a "pushbutton counter" sold for $8, I guess on Amazon. I was able to pull out the "contact" wires, and used the device to verify that a rotary sensor generated 2012 pulses per revolution.

 

[chuckey]

It might be worth while, to use a LED on one side and a photo diode or transistor on the other.
Frank