Cine light meter that is only 25 bucks @HackerUni

Uploaded January 2026 | Updated September 2026, 3 weeks ago

Sekonic L-308X-U might be cool, but I build an equivalent (almost) for $25! All thanks to ESP32, SSD1306 OLED display and VEML7700 digital light sensor

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$How BAD are cheap 18650 Li-Ion batteries from China? China is a magical place where you can get everything for a fraction of a price. Like 10000mAh 18650 LiIon batteries for $1.5. Of course, we have to begin with a note, that there are no 10000mAh 18650 batteries. Technology does not allow for such energy density. And if they would exist, they would not cost $1.5. Closer to $15. Anyhow, Ive bought a couple of cheap 18650 on Aliexpress and tested them with a DIY OpenSource OpenHardware Arduino-based battery discharger. Here are the results of brands like Mr. Henry, UltraFire, GTL EvreFire, SkyWolfEye, and so on... Are they worth the price? NO! Results: http://bit.ly/2JS3jJF 18650 Li-Ion Batteries http://bit.ly/2OxtRPl QuadMeUp Discharger on GitHub https://github.com/DzikuVx/quadmeup_discharger #quadmeup #18650 #test 0:00 Intro 0:28 Cheap 18650 Li-Ion batteries from China 3:31 Battery discharger and test procedure 7:06 The 18650 Li-Lion test results 11:41 Summary Visit my primary channel https://www.youtube.com/user/dzikuvx Facebook https://www.facebook.com/quadmeup Discord server https://quadmeup.com/discord My website https://quadmeup.com/ Instagram https://www.instagram.com/dzikuvx/$

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Cine light meter that is only 25 bucks