Matrixwide

Here’s some vintage neon photographed during a recent trip to NYC:

Andrea info can be found here: https://caringbridge.org/visit/andreadavis5

Here are my William Dzus artifacts. I admire him greatly. He was a hard-working, kind, and generous man. He came to the United States with little more than ambition and a name of someone to vouch for him and provide him work. He persevered though many setbacks and hardships before gaining recognition though his patent for the Dzus Fastener. He made an important contribution to the WWII defense production, provided his community with jobs, worked to preserve Ukrainian culture, and saved many from the horrors of communism.

He was also my great-grandfather. Thank you, William.

My grandfather, Theodore Dzus, was an avid amateur filmmaker. The following link is a collection of his films from the late 1930s until the mid 1960s. I’ve got his 8mm films on youtube somewhere – I’ll give you a link in a later post.

 

We’ve got a rather comprehensive archive of Dzus and Davis family photos from the 1920’s until the present. I think mostly we’re missing photos of the kids from 1998 to 2009. I’ll remedy that eventually.

The following page contains links to galleries on imgur.com. Follow the directions there for the best viewing experience:

 

Andrea will be joining the Matrixwide blog to keep us up to date on what’s going on in her life. She’ll have full control over the content and you’ll have the assurance that we’re keeping your information as private as possible, as opposed to Facebook and other commercial sites.

Thank you,
Alexander Davis

Latest compact board is back from OshPark (www.oshpark.com) and testing is complete. Using the base Adafruit transimpedence amp design we were able to come up with a simple formula for convert the raw ADC values into a UVI. We’re debating whether or not it’s worth it to come up with a resistor divider which gives a bit more signal, but basically doubling the ADC readout and then dividing by 100 does give us plenty of headroom in case someone encounters some really crazy UV exposure. Additionally, we added a slow on-off warning blink should the ADC return a maxed-out value.

 

I’ve got a very good data set for UVI 0 to about 7.5. Just waiting for the sun to get higher in the sky so we can get some 8-11 UVI days.

The Roitner Technik GUVA-S12D is too expensive for a product hoping to cost less than $10 each. So I am looking for more cost effective alternative.

Here’s the test rig, consisting of a GUVA-S12D, a VEML6070, and an unspecified LED acting as a light sensor. The ADC reading seems to track the UVI produced by the GUVA-S12D quite well up to UVI 5. From there up to 6.5 (the highest I have measured outdoors) it is a bit lower.

My LED under test shows good visible light blindness. It responds quite strongly to a 365nm UV LED (as does the VEML6050). This might be due to the spectral distribition of the LED. I’ll be looking around for a local lab to quanitfy the response of all three under controlled conditions.

Here’s the older UV Monitor v 1.2. This one used the same GUVA-S12SD UV sensor, but used it to calculate an accumulated UV dose and warn the user when they are about to get to a dose causing sunburn. Primary issue here was inability to control orientation and therefore the indicdent UV level. Pretty much the only way to use it and get accurate results was to attach it to the brim or top of a hat.