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Trigger an Arduino board via USB

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Re: Trigger an Arduino board via USB
« Reply #40 on: 09 / October / 2013, 06:08:33 »
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wrong forum ? new thread required ? [I only posted here because the topic includes the word 'Arduino'  :blink: - so please delete if required]

I posted the following on the Arduino forum recently - but no reply yet [maybe the 'gurus' over there are a little substandard (or maybe they were just totally confused by the 'vagueness' of my request)].

I post the same text here on the [slim ?] chance, someone has ever had need to operate a camera in concert with a projector using a microcontroller  http://forum.arduino.cc/index.php?PHPSESSID=ljgppt6uvllod80dr8j8lc30l0&topic=190528.msg1408589#msg1408589:

Here's the text:
   
"Speed of Projector control
« on: September 28, 2013, 06:31:33 am »

"Apologies for my 'vagueness' in this first post.

I am interested in switching a projected image between a 'noise' pattern and black as quickly as possible [this related to a multicamera photogrammetry 3D mesh creation application.

The capture sequence I have in mind is:

(i) to use one mutiple bank of, synchronously triggered, cameras [in the presence of the projected "noise" pattern] to capture geometry information

then, following a short exposure time:

(ii) synchronously trigger a second multiple bank of cameras [after the projected noise pattern has 'disappeared '] to capture 'texture' information in the presence of studio flash [this also a very short exposure time]

The overall exposure time must be as short as possible due to movement of the subject.

The only Arduino serial control topic [projector related] that I have found, so far, is this http://forum.arduino.cc/index.php?topic=12665.0 

The machine referred to there was a Dell MP5100 projector - the seemingly interesting point, to me, is that 'power on' seemed software controllable.

I now wonder if there is also a 'power off' software control that I can avail of, in this or other projector types - or perhaps simply software control to switch, quickly, between 2 different  projected images [the 'noisy' projection and 'black'].

Timing is critical. I realise that the timing of 'reaction' to the Arduino serial control may be hidden / complex / arbitrary - but, with no experience in this subject area, I thought I would ask the question here to see if some Arduino [/projector] 'guru' might comment
"

 

Re: Trigger an Arduino board via USB
« Reply #41 on: 09 / October / 2013, 06:21:26 »
Before we discuss this in detail, consider the wisdom of turning the lamp on/off thousands of times  :-

http://en.community.dell.com/support-forums/peripherals/f/317/t/18591709.aspx

Re: Trigger an Arduino board via USB
« Reply #42 on: 09 / October / 2013, 09:44:34 »
Before we discuss this in detail, consider the wisdom of turning the lamp on/off thousands of times  :-

http://en.community.dell.com/support-forums/peripherals/f/317/t/18591709.aspx

I [sort of ?] suspected that may be the case when I originally posted and therefore included the point about switching the image [rather than turning on/off].

Thanks for your link - it confirms my suspicion [and how lazy I am - in failing to research before the Arduino board posting]  :)

 

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