[Alt-photo] Exposure Unit

don at sweetlegal.co.nz don at sweetlegal.co.nz
Wed Sep 6 01:31:03 UTC 2017

Hi Greg

If you are reading the UV sensor values at regular intervals into an 
Arduino, this sketch may help.  It is said to produce a running average 
of the values.  Displaying that and the elapsed time would give you a 
quick way of calculating the dose.


Don Sweet

On 2017-09-06 02:04, Greg Brophy via Alt-photo-process-list wrote:
> Hi Don and Larry. Thanks for the interest. I am using Arduino with the
> ML8511 sensor and I need to figure out how to code for dose.
> “Radiant exposure (H), is dose, and is described in joules (unit of
> energy) per square meter (J m2) or joules per square centimeter (J
> cm2). Note that a watt is a joule per second thus the dose rate (W
> cm2) multiplied by the exposure duration (seconds) equals dose (J
> cm2).”
> So basically I need to create a timer, then multiply that with the W 
> cm2.
> I just found out the sensor I am using is no longer available and will
> have to find a new one.
> I am using the basic code that was provided with the sensor.
> Thanks,
> Greg
>> On Sep 4, 2017, at 6:18 PM, Larry Ogrodnek <ogrodnek at gmail.com> wrote:
>> Hey Greg, that sounds really great!  Would love to hear about it when 
>> you are ready to share.
>> I have some C firmware experience and may be able to help depending on 
>> what you need.
>> I used to make/sell some LED nametag kits 
>> (http://analogmachines.com/p/nametag/) and have some experience in 
>> basic/amateur hardware/software work...
>> thanks,
>> larry
>>> On Mon, Sep 4, 2017 at 9:49 AM, Greg Brophy via 
>>> Alt-photo-process-list 
>>> <alt-photo-process-list at lists.altphotolist.org> wrote:
>>> I also wanted to order one of the light measure UV meters and was 
>>> disappointed that it was discontinued. I went on Facebook and some 
>>> people pointed me in the right direction for creating my own which I 
>>> am now in the process of doing. I have a prototype I am working on 
>>> and am just trying to fix a few kinks in the code, but when done I 
>>> will share how to do it or if people don't want to make it, I can 
>>> make it as well. I also plan on making a few improvements like touch 
>>> screens. The best part is that most of the parts are open source and 
>>> what isn't can easily be printed with a 3-D printer. I will send out 
>>> updates as I get closer. If anybody know how to program in C++ and 
>>> wants to help, let me know.
>>> Greg
>>> _______________________________________________
>>> Alt-photo-process-list | altphotolist.org
> _______________________________________________
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