Make Your Own LED Battery Level Indicator

About: Awesome Electronics Tutorials, Projects and How To´s

Intro: Make Your Own LED Battery Level Indicator

In this project 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. Let's get started!

Step 1: Watch the Video!

The video gives you all the information you need to create your own Battery Level Indicator. During the next steps though I will present you some additional information.

Step 2: Order Your Components!

Step 3: Create the Circuit!

Here you can find the schematic as well as pictures of my finished perfboard circuit. Feel free to use them as a reference to create your own circuit.

Step 4: Success!

You did it! You just created your own LED Battery Level Indicator!

Feel free to check out my YouTube channel for more awesome projects: http://www.youtube.com/user/greatscottlab

You can also follow me on Facebook, Twitter and Google+ for news about upcoming projects and behind the scenes information:

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    6 Discussions

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    SilentException

    2 months ago on Step 3

    Hi, nice project :) Been thinking of making something like this but have a couple of thoughts:

    - The schematic and the board do not match. There are 3 types of capacitors added and I think a fuse holder? Maybe you could update the schematic?

    - The DC-DC converter has 3-24V input specification. So it is only useful for up to 5s LiIon/LiPo battery packs. Maybe 6s if you like living on the edge :) I suppose there are DC-DC converters for higher voltages but I think you can achieve the same thing with voltage reference IC and a voltage divider, correct?

    1 reply
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    martonbaksaSilentException

    Reply 10 days ago

    Hey! Based on your comment, you imply that you could use a 1S battery with this circuit, could you provide any ideas on how you convert this circuit to use 1S instead of 4S? Thanks a lot for your help,

    Marton.

    0
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    martonbaksa

    Question 10 days ago on Step 3

    Hello! I am wondering how you would adjust the potentiometers and everything to make this work with a 1S (1 cell 3.7 nominal battery.) Thanks a lot for any ideas anyone can provide.

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    KableClear

    2 months ago

    I've made this circuit and keep "bricking" my lm324, as in it becomes a dead short. Can you post values of the three capacitors and/or update the schematic? Thanks!

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    DGW

    2 months ago

    Please include an explanation of how this circuit functions for beginners. They do not know that an LM324 is a quad comparator or that the resistors make up voltage dividers.

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    GianlucaG1

    2 months ago on Step 4

    You need 20V by a step-up converter??? Why? You can simply compare a fraction of the battery voltage! :-)