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Battery voltage level indicator using IC LM3914


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Circuit Description:

  1. LM3914 Dot/Bar Display Driver IC:
    • The LM3914 is a versatile display driver that can be configured to operate in either dot or bar mode. In this application, it will be configured in bar mode to display the battery voltage level.
  2. Resistors (R1, R2, R3, R4):
    • Resistors are used to set the reference voltage levels for the LM3914. The values can be chosen based on the desired voltage thresholds for each LED.
  3. LEDs (D1 to D10):
    • Ten LEDs are connected to the outputs of the LM3914. Each LED corresponds to a specific voltage range, providing a visual indication of the battery level.
  4. Zener Diode (Optional for Overvoltage Protection):
    • A Zener diode can be added for overvoltage protection. It prevents damage to the LM3914 and LEDs in case the battery voltage exceeds a certain limit

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