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dirtdiver over 14 years ago

Hello everyone, I'v been given a school project:

calculate the gravity of earth using two sensors to estimate the time needed for a free falling object to go from sensor1 to sensor 2.

Now, I'm gonna use 2 photoresistors and 2 lasers ,can anyone suggest how to measure that time?

Can that value be displayed on a pin when I debbug it?

I need to make that project fast so any advice is appreciated!

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michaelkellett over 14 years ago

Before you get too carried away with the hardware - work out how you are going to calculate g from the transit time between two points - I'll tell you now for free that it can't be done without making some assumptions that may be hard to keep to in practice and will dictate exactly how you set up the experiment.
If your school has a modern oscilloscope you don't actually need to build anything.
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dirtdiver over 14 years ago in reply to michaelkellett

Well , I only need to find out what the time is. The calculations are in someone elses hands
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dirtdiver over 14 years ago in reply to michaelkellett

Well , I only need to find out what the time is. The calculations are in someone elses hands
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