List: standalone runtime graph maker/ lux loggers (for flashlight reviewers)

[bmengineer]

@Yokiamy

Interesting, does it work as a stand alone product?

I still have a raspberry doing nothing for over 1,5 year

Sort of. You could easily configure it to start on a button press, but I just start mine with an ssh command.

[ChibiM]

For anybody interested. It seems like the following Lux Meters are actually the same, sold under different brands:

There seem to be actually 2 versions though

Reed Instruments SD-1128SD

Lutron LU-LX1128SD

PDF: http://www.sunwe.com.tw/lutron/LX-1128SDeop.pdf

General DLM112SD: https://www.tequipment.net/GeneralDLM112SD.html

There is another version, which is the LX-1148SD

Lutron LX 1148SD: https://inspectusa.com/lutron/manuals/lx-1148sd-manual.pdf

Sunwe LX 1148SD: http://www.sunwe.com.tw/lutron/LX-1148SD.pdf

Voltcraft LX-2000 : https://asset.conrad.com/media10/isa/160267/c1/-/fr/001666060PI06/image.jpg

The obvious difference betwen these 3 (LX 1148SD) and the LX 1128 is the number of buttons.

Maybe this is another one:

Francaise-instrumentation LX 108 : https://www.distrame.fr/publicmedia/formatted/769/996/fr/LX108-luxmetre-face.jpg;maxh=400,maxw=470.jpg

[Yokiamy]

One thing i found out is that they look cheap but they are not cheap

[gchart]

$210?!

[jeff51]

@Terry Oregon

so need to figure out how to make that into clear data… starting from 0 minutes. Instead of the hours of the day

I could never figure that out either. So . . . . .

In my Reed Instruments, I always zero the hours/minutes/seconds just before I start a runtime graph. I have to do this every time I do a runtime, but it only takes seconds once you figure it out. Excel then accepts this as starting at 12:00am.

I had the same problem with Excel.
I ended up adding a column starting at 0, and progressing at the sample interval. Using that as a time scale.
I like Libra Calc for the graphs, but could never get the darn thing to put a time scale on the graph correctly. It seemed to have a mind of it’s own as far as making the time interval on the axis.
But other than that, it worked well and is free.

I have been using one of the osram diodes that seem to be inside all of the reasonable cost lux meters.
In one of the circuits from Terry’s vast diode test. They are quite cheap.
I measure with PICO-Log software. But that’s not a stand alone option.
All the Best,
Jeff

[bmengineer]

@jeff51

@Terry Oregon

so need to figure out how to make that into clear data… starting from 0 minutes. Instead of the hours of the day

I could never figure that out either. So . . . . .

In my Reed Instruments, I always zero the hours/minutes/seconds just before I start a runtime graph. I have to do this every time I do a runtime, but it only takes seconds once you figure it out. Excel then accepts this as starting at 12:00am.

I had the same problem with Excel.
I ended up adding a column starting at 0, and progressing at the sample interval. Using that as a time scale.
I like Libra Calc for the graphs, but could never get the darn thing to put a time scale on the graph correctly. It seemed to have a mind of it’s own as far as making the time interval on the axis.
But other than that, it worked well and is free.

I have been using one of the osram diodes that seem to be inside all of the reasonable cost lux meters.
In one of the circuits from Terry’s vast diode test. They are quite cheap.
I measure with PICO-Log software. But that’s not a stand alone option.
All the Best,
Jeff

Python is your friend.

[jeff51]

@bmengineer

Python is your friend.

Ha!, I’m too old, Python is your friend,
Fortran 4 was my friend…

Brute force in Excel. Never make an elegant formula, when 5 columns worth of obscure calcs will do….
All the Best,
Jeff

[ChibiM]

@Yokiamy

One thing i found out is that they look cheap but they are not cheap

I have the strange feeling that they might actually (close to) be the same as the Extech SDL series.
Alghough the buttons are placed differently, the rest looks pretty similiar.

[Yokiamy]

@ChibiM

Although I already have 2 log meters, 1 being less than ideal and including some problems (Extech HD400) the SDL400 does a good job at what I want it to do.

But for the sake of other reviewers, a little bump to see if there are any other alternatives.

This looks like an upgraded GM1020?

Benetech GM1030

https://aliexpress.com/item/33010626789.html

Chibim

This looks like a very interesting meter, it can record 2000 data points with a selectable interval, and its cheap, so it might be useful.
It has bluetooth and usb (for retrieving only probably)

Please find the manual Here

[bmengineer]

I’ve added a short post with a bit of information about what I ended up doing. It works great for me, and I’ll keep working on it to clean it up if there’s interest.

[Yokiamy]

@bmengineer

I’ve added a short post with a bit of information about what I ended up doing. It works great for me, and I’ll keep working on it to clean it up if there’s interest.

Very interesting!
I still have a raspberry pi catching dust on the shelf…

[ChibiM]

@bmengineer

I’ve added a “short post”:RuTiTe - my standalone runtime tester project with a bit of information about what I ended up doing. It works great for me, and I’ll keep working on it to clean it up if there’s interest.

Nice!

If there is a nice read up on how to set it all up, that would be great!

[bmengineer]

@ChibiM

@bmengineer

I’ve added a short post with a bit of information about what I ended up doing. It works great for me, and I’ll keep working on it to clean it up if there’s interest.

Nice!

If there is a nice read up on how to set it all up, that would be great!

No write up yet, it’s still pretty alpha. But if you can figure out how to get a Pi up and running you can work this out too!

[ChibiM]

@bmengineer

@ChibiM

@bmengineer

I’ve added a “short post”:RuTiTe - my standalone runtime tester project with a bit of information about what I ended up doing. It works great for me, and I’ll keep working on it to clean it up if there’s interest.

Nice!

If there is a nice read up on how to set it all up, that would be great!

No write up yet, it’s still pretty alpha. But if you can figure out how to get a Pi up and running you can work this out too!

Not really for me ;) I don't think I will dive that deep :) But for other members.

[gchart]

I’ve been meaning to post the details on my lumen tube build for some time, finally got a first-pass done.

https://github.com/gchart/luxmeter

[bmengineer]

@gchart

I’ve been meaning to post the details on my lumen tube build for some time, finally got a first-pass done.

GitHub - gchart/luxmeter: ESP8266-based WiFi Lux Meter

That readout is snazzy

[gchart]

Thanks bmengineer! It’s pretty basic but it’s great having immediate visual feedback. It also displays the IP address at start up (despite using a reserved IP) and diagnostics in case any sensors aren’t detected.

[ChibiM]

Cool stuff gchart! Thank you for sharing!

[gchart]

I just pushed a big update to my Lux Logger project.

Same hardware:

• an ESP8266
• a small OLED screen
• TSL2591 lux sensor
• MLX90614 IR-based temperature sensor

Instead of using an app or a batch script to log the readings, the ESP8266 itself is hosting a webpage that you pull up. That way you can use your phone, a tablet, or a computer to perform tests. And instead of polling data at set intervals, this keeps an open socket connection that quickly pushes new data any time there’s a sufficient change in the data. Oh, and I added a real-time graph.

[Yokiamy]

Fascinating stuff! You Rock Gchart!

Strange that there aren’t more manufacturers which incorporate this, and still work with relative ancient technology which are way overpriced
I actually built your specific project and it works amazing !
And the best part of it is that the parts are dirt cheap! (ok, it lacks a nice housing etc, but even that can be arranged for a few dollars more)

Some pics of my result here