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Old 1st August 2017
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Droplets

Weather awful so I thought I would try some droplet photography.
Only managed to do single drops so far controlling a release solenoid and a flash with a program I wrote in Python for my Raspberry Pi.

Good fun.

[IMG][/IMG]


Two drops colliding is the next challenge.
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Old 1st August 2017
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Re: Droplets

It looks like glass when it's frozen like that. Definitely good fun, catching water drops can be quite addictive, easily passes the time when it's wet
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Old 1st August 2017
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Re: Droplets

Try colouring the water you're using for the drops.
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Re: Droplets

Nice. I like it.
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Old 2nd August 2017
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Re: Droplets

Try dropping into a glass and use coloured LEDs from below for differing effects.

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Old 5th August 2017
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Re: Droplets

Very nice! Tell us more about the RPi application! What's the trigger being used?
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Old 5th August 2017
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Re: Droplets

Quote:
Originally Posted by pdk42 View Post
Very nice! Tell us more about the RPi application! What's the trigger being used?

The way I do it doesn't require a trigger as such, its accurate timing.

You do need a darkened room for it to work properly.
I have the camera in Manual mode ISO 200, aperture f/11. and set the shutter speed at about 3 seconds. Manually focussed on where the the drop will hit the water. If you take a shot with no flash it comes out basically black. I simply trigger the camera and then manually start the control process in the RPi with a mouse click. The RPi does the accurate release timings in milliseconds.

The RPi first opens and closes a solenoid that releases a drop of water from above the dish. The time the solenoid is open for can be varied to adjust the size of the droplet. The release of the droplet automatically triggers another timer in the RPi that then fires the flash a number of milliseconds later, again this time can be adjusted to make sure the flash fires at the exact right moment.

The flash is connected via a cable release to the RPi. Flash set at 1/128 power which is very short duration and so freezes the drop at the exact right time.

I have now added the capability for the RPi to time the release of a second drop after another short delay and hope to capture a collision of the rising droplet with the second one coming down. Get the timings spot of for this is more challenging. I have programmed this in Python and have a control screen on my desktop that I can update and send new timings to the RPi for it to do its stuff. Keeps me occupied.

If anyone is interested I am happy to share code and connection info.

I have a little relay board attached to the RPi to trigger the Flash and the Water release solenoid.

Hope this makes sense.
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Old 6th August 2017
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Re: Droplets

Discovered that the shape of the vessel holding the water makes a big difference to the droplet shape.

[IMG][/IMG]
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Old 7th August 2017
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Re: Droplets

That is interesting. I bet there is some interesting science behind that conical spray from a conical glass. Excellent shot by the way too.
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Old 11th August 2017
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Re: Droplets

A couple more with two drops colliding

[IMG][/IMG]


[IMG][/IMG]
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