2018-07-08

[public] 1.05M views, 15.4K likes, dislikes audio only

GreatScott!

Rapid prototypes ($2 for 10 PCBs 10*10cm): https://jlcpcb.com

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More project information (schematic, parts list, pictures,.....) on Instructables: https://www.instructables.com/id/Make-Your-Own-LED-Battery-Level-Indicator/

Parts list (incomplete, see Instructables for more, affiliate links):

Aliexpress:

2x LM324: https://s.click.aliexpress.com/e/_d8EF8Yr

6x 10k Trimmer: https://s.click.aliexpress.com/e/_dTFyPv5

6x 2k Resistor: https://s.click.aliexpress.com/e/_dTPpXjt

6x 5mm LED: https://s.click.aliexpress.com/e/_dV63r7D

1x Boost Converter: https://s.click.aliexpress.com/e/_d8Eky7d

Ebay:

2x LM324: http://rover.ebay.com/rover/1/711-53200-19255-0/1?icep_ff3=2&pub=5575101368&toolid=10001&campid=5337606358&customid=&icep_item=381374818352&ipn=psmain&icep_vectorid=229466&kwid=902099&mtid=824&kw=lg

6x 10k Trimmer: http://rover.ebay.com/rover/1/711-53200-19255-0/1?icep_ff3=2&pub=5575101368&toolid=10001&campid=5337606358&customid=&icep_item=182551169452&ipn=psmain&icep_vectorid=229466&kwid=902099&mtid=824&kw=lg

6x 2k Resistor: http://rover.ebay.com/rover/1/711-53200-19255-0/1?icep_ff3=2&pub=5575101368&toolid=10001&campid=5337606358&customid=&icep_item=252838503547&ipn=psmain&icep_vectorid=229466&kwid=902099&mtid=824&kw=lg

6x 5mm LED: http://rover.ebay.com/rover/1/711-53200-19255-0/1?icep_ff3=2&pub=5575101368&toolid=10001&campid=5337606358&customid=&icep_item=172618155078&ipn=psmain&icep_vectorid=229466&kwid=902099&mtid=824&kw=lg

1x Boost Converter: http://rover.ebay.com/rover/1/711-53200-19255-0/1?icep_ff3=2&pub=5575101368&toolid=10001&campid=5337606358&customid=&icep_item=112619032791&ipn=psmain&icep_vectorid=229466&kwid=902099&mtid=824&kw=lg

In this video I will show you how we can use the classic LM3914 IC to create an LED Battery Level Indicator. Along the way I will show you how the IC works and explain why it is not the most precise circuit for a Li-Ion battery pack. And at the end I will show you how I created my own, more precise Battery Level Indicator circuit with a couple of simple components.

Websites mentioned in the video:

https://www.powerstream.com/p/INR18650-25R-datasheet.pdf

https://www.akkuteile.de/

http://lygte-info.dk/review/batteries2012/Sony%20US18650VTC6%203000mAh%20(Green)%20UK.html

https://www.akkuteile.de/lithium-ionen-akkus/18650/sony-konion-us18650vtc6-3120mah-3-6v-3-7v-flat-top-max-30a/a-100680/

Thanks to JLCPCB for sponsoring this video

Visit https://jlcpcb.com to get professional PCBs for low prices

Music:

2011 Lookalike by Bartlebeats

Killing Time, Kevin MacLeod

(incompetech.com)