Battery Level Indicator circuit with LM3915


In this electronics project, I have explained how to make a battery level indicator circuit with LM3915 IC to monitor the voltage level of any batteries.

battery level indicator cover pic

You can adjust the maximum voltage level according to the battery ( 12V or 9V ) by rotating the trimmer.

Circuit of Battery Level Indicator

battery level indicator circuit

The circuit is very simple, I have use LM3915 IC to show the voltage level of the battery.

Here, LM3915 will control the current through the LED, so I have not used any resistors in series with the LEDs.

PCB Layout for Battery Volt Level Indicator

PCB Layout of battery level indicator

Please download the PCB layout, then print it on the A4 page.

Please check the PCB size while printing, it should be the same as mentioned

Required Components:

  1. LM3915 IC
  2. 3.3k 0.25-watt Resistor (R1)
  3. 18k 0.25-watt Resistor (R2)
  4. 56k 0.25-watt Resistor (R3)
  5. 5-mm 1.5V LEDs (10 no)
  6. Switch (S1)
  7. 10k Potentiometer (VR4)
  8. Connectors and IC base
  9. Zero PCB or cardboard

Tutorial Video on battery volt level indicator

In this tutorial video, I have shown all the steps to make the voltage level indicator circuit on a homemade PCB.

But you can also download the PCB Gerber file for this LM3915 project, and order the custom design PCB from

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Steps to order PCB from PCBWay

To order the PCB first visit

Step 2 to order from PCBWay

Then enter the following details:

  1. PCB Size (Length & Width) in mm & PCB quantity
  2. Select masking color for the PCB
  3. Select country and shipping method
  4. Click on the “Save to Cart” button
Step-3 to order from PCBWay

Now click on the “Add Gerber Files” to upload the PCB Gerber file.

Then click on the “Submit Order Now” to place the order.

After that, they will review the Gerber file and accordingly confirm the order.

I have used their services for my different electronics projects, I always received the PCB on time and the quality is very good in this price range.

How to make Battery Level Indicator PCB

Steps for making the volt level indicator circuit on PCB:

  1. Print the PCB Layout and stick it on cardboard or Acrylic sheet

    While printing please consider the PCB size mentioned in the PCB layoutPCB Layout of Battery level indicator

  2. Drill the holes for the components as PCB Layout

    drill the holes on the PCB

  3. Connect all the components as per the PCB layout

    Place all the components on the PCB as shown, then solder all the components as per the circuit.battery level indicator PCB

Now, the PCB for level indicator circuit is ready.

Set the MAX voltage level

set the max voltage level

Now to set the indicator for 12 volt battery, first connect 12 volt supply.

Then rotate the potentiometer until all the all the LED turns on.

After that disconnect the power supply.

Connect 12V Battery

Connect 12V battery

Connect the 12-volt battery with the indicator circuit.

Now the LEDs will glow as per battery output voltage level. And you can monitor the voltage level of the battery.

Thus you can set any voltage level and use this same circuit for different batteries like 6V battery, 9V battery, 12V Battery, etc.

DOT & Graph Mode

volt Level indicator in dot mode

You can monitor the voltage level both in DOT and Graph mode using the S1 switch.

Please share your feedback on this mini-project and also let me know if you have any queries.

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I hope you have liked this electronics project, Thank you for your time.