A Battery level indicator (Battery Guage) is an electronic measuring instrument that indicates the immediate voltage level of any DC battery. It is a very common testing circuit, employed in various industries. So today, we are going to build a Battery Level indicator using the LM3914N dot/bar display driver IC.
PCB Prototype for 5$ 10 PCB’s:
You will need the following parts to build this project
- 1x LM3914 LED Driver IC.
- 10x RED LEDs
- 10K Pot
- Resistors (1K, 4.7K, 18K)
- 12V/9V/3V DC Power Supply
- Battery Clips
- Connecting Wires
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Step1 Solder IC with Base
Step2 Solder LED’s
Step 3 Solder Resistors
Step 4 Solder Variable Resistor
Step 5 Solder Battery Terminals
This circuit is designed to monitor 10V to 15V DC. The circuit will work even if the battery voltage is 3V. In this circuit LED’s (D1-D10) displays the capacity of the battery. Here, the 1K resistor & the 10K Potentiometer form a potential divider circuit, where the POT is used to calibrate the Input signal. There is no need for any external power supply to this circuit as the circuit functions as measuring equipment for any DC battery connected to it.