[Alt-photo] Exposure Unit

greg at gregbrophy.com greg at gregbrophy.com
Wed Sep 6 01:37:59 UTC 2017


Thanks Don,

I will check it out. 

I ordered a VEML6070. I have to change a set resistor, but I think this is a good option since it reads UV light, not just calculating it based on light output.

Greg

> On Sep 5, 2017, at 9:31 PM, don at sweetlegal.co.nz wrote:
> 
> 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.
> 
> https://www.arduino.cc/en/Tutorial/Smoothing
> 
> 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
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> 



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