Home

Cumulative exposure meter for long duration exposures

Submitted by phishinphree on Sat, 11/07/2009 - 00:11
Posted in

Hi all!

This will be where I'll document my exposure meter project using the tsl 230R light sensor. It is based around an 8-bit 18f series pic micro, the previously mentioned light sensor, currently uses 6 buttons and a 4x20 lcd.

The goal of this light meter is to aid with the proper exposure of large pinhole cameras. I should state now that I am not a photographer. I don't even own a camera besides the one in my phone. I am a computer scientist and computer engineer working on this project in my spare time for some friends because I find it interesting. Anyway, the problem with long duration exposures is that varying light levels can make it very difficult to calculate proper exposure. This is epically true outdoors on partly cloudy days.

This project, which I have yet to come up with a clever name for, will address the issue by sampling light levels at 1 second intervals and continuously adjust the exposure time. Currently, I'm working to eliminate some bugs in calculating lux and exposure times but its getting closer by the day. Many thanks to Chris for the example code and a place to document the project.

Look for more in the coming days but feel free to ask questions if you can't wait that long!

-Jason

Gucci Outlet Designer, noto

Submitted by youyou208 on Wed, 05/16/2012 - 01:57.

Gucci Outlet Designer, noto per essere il migliore amico delle femmine, sono un'estensione della personalità di una donna,Gucci Borse che danno la sua classe, eleganza e senso dello stile.Il designer migliori e più recenti ispirate borse - Louis Vuitton, Gucci Sito Ufficiale di marca internazionale di design ad una frazione del costo. Sono leggeri, Louis Vuitton Outlet
lunga durata e unico per colore, forma e stile. Grande abbastanza da
contenere tutti gli elementi essenziali, ma abbastanza piccolo per dare
glamour a qualsiasi occassion - sia esso giorno o di sera!Louis Vuitton Borse Sia che preferiate elegante o casual, glamour o minimizzato, si può avere lo stile e la scelta del colore.

Easytone Reebok est connu

Submitted by youyou208 on Wed, 05/16/2012 - 01:55.

Easytone Reebok est connu pour sa conception de la chaussure unique et inspirante,et la même créativité n'a pas été perdu sur le Reebok Zigtech.
Pour les sportifs et les femmes, que ce soit dans le
tennis,l'athlétisme,le basket ou le Zigtech Reebok offre un avec tout ce
qu'ils recherchent dans une Pump Reebok chaussure.Chaussures doivent être confortables, anti-choc et pas entièrement flat.The Reebok Chaussures fonction unique,une doublure en maille et cuir qui réussit à lui donner une allure élégante - Easytone.

Gucci Gucci Bags Outlet is

Submitted by youyou208 on Wed, 05/16/2012 - 01:53.

Gucci Gucci Bags Outlet is the biggest-selling Italian brand.Will the Gucci Bags 2012 hobo be making a comeback for spring? If Gucci has anything to say about it, the answer is “yes.” Gucci Men
AND Ladylike satchels and small crossbody bags have been the currency
of the accessories industry for the past several seasons, so much so
that Gucci Spring 2012's Gucci Sunglasses 2012 stable of chain-strapped hobos was more than a little surprising to see.Brand New Gucci Shoes Sale!2011 Style gucci outlet,60% OFF.

I kind of love the idea of

Submitted by Echo on Fri, 05/11/2012 - 08:38.

I kind of love the idea of super slim pomegranate
that gets super
slim done in the process. And that's why this year (after two years
of living in this house) I've taken on http://www.superslimdietpill.com as
my new chore. Usually we just pay super slim pomegranate weight loss
capsule to keep up with slim
pomegranate, but it's kind of super slim green lean body capsule.
I have to tell you though slim pomegranate me and
Josh are pomegranate diet pills.
Computer people, yes, but not the super slim pomegranate pills. I'm
convinced that keeping up with super
slim green lean body capsule will help me with my weight loss goals. I don't
know many overweight super
slim or gardeners, do you?

TSL 230R sensor

Submitted by AAndy42 on Sat, 02/13/2010 - 15:27.

Hey there
Sounds like a kick butt project...Thanks!!
where would I find some information on the 230R?
I'm curious where the spectral activity lies...UV, Visible" IR...
thanks again
AAndy42

Andy, The TSL230R data sheet

Submitted by shutterdrone on Sat, 02/13/2010 - 16:49.

Andy,

The TSL230R data sheet has that information, it is available here: http://www.taosinc.com/getfile.aspx?type=press&file=tsl230r-lf-e3.pdf

!c

Any updates on this? I'm

Submitted by willrea on Wed, 01/13/2010 - 01:29.

Any updates on this?
I'm currently building an 11x14 pinhole camera and would love to have a meter that'd adjust the exposure on the fly.

updates

Submitted by parrotcam on Tue, 12/01/2009 - 06:54.

I'm interested in the progress of this project. It might be interesting to build a pinhole shutter around such an idea.
Kurt Mottweiler
mottweilerstudio.com