Thanks, so I’ll stick to the 1020.
I'm currently spending some of my spare time on a personal project I've had my sights set on for a while - a standalone runtime test setup based off of the Adafruit TSL2591 light sensor and a Raspberry Pi Zero.
Making it standalone is a bit of a learning experience for someone like myself with little coding skills, but if you want to use it connected to a PC it would be very easy. The sensor and RPi0 together are less than $20, and the rest of the pieces needed to get up and running you probably have in a junk drawer somewhere (microUSB cable, microSD card, some wire).
Edit: If I were going to use this tethered to a PC, I would probably replace the RPi0 with an Arduino Micro or similar.
Arduino is interesting. I did a lot with the Leonardo with its native USB port. You can make it a keyboard to transfer data. And I think there’s a SD shield available. Add LCD and sensor and be done with the hardware.
If you build one and if you make a thread about it, please let me know so I can add that here
I’ll be sure to make a post and link to here if it ever gets to a complete state 
Awesome, thanks!
I have a fully functioning proof of concept with a Raspberry Pi Zero W and my TSL2591 sensor. The code is a bit sloppy still, but it works.
Pros:
- Output is fairly clean, no excess noise
- Sensor quality is known unlike using an old Android phone (the one I'm using has a pretty low measurement resolution)
- Includes an IR sensor, though I haven't added code to measure that yet
- Extremely configurable
- Cheap! The Pi Zero W and the sensor are less than $20. I've added some indicating LEDs to my build, and you'll need some wire, a microSD card, and probably a microHDMI adapter for initial setup
Cons:
- Some assembly and soldering is required
- To use this standalone you'll need a basic understanding of ssh and scp tools. If you're using Linux or OS X, it's very easy
If anyone is interested, contact me and I can send a copy of my script to test. If it works I may make it available somewhere in the future.
Interesting, does it work as a stand alone product?
I still have a raspberry doing nothing for over 1,5 year
I have been thinking of building the same, but using ESP32 insted of the Pi. Oled screen for quick readouts, web ui with configuration and graphs, logging to the real database are on the planed features list.
I take it you did it in Python? I’d be interested in taking a look.
That’s similar to what I use… an ESP8266 hooked up to a TLS2591
Cross post from the “”What did you mod today?“”:What did you mod today? - #7024 by gchart thread from last February:
Sort of. You could easily configure it to start on a button press, but I just start mine with an ssh command.
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
One thing i found out is that they look cheap but they are not cheap
$210?!
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.
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
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.
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
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.