#Battery indicator driver#
LED driver outputs are current regulated.Programmable output current 2mA to 30mA.Internal voltage reference from 1.2 to 12v DC.LEDs, LCDs, and vacuum fluorescents are all driven by the Lm3914.The IC contains adjustable reference and accurate 10-steps divider. This IC’s operational voltage ranges from 3 to 25 volts DC. Even if the battery voltage is 3V, the circuit will operate.
The circuit is intended to detect voltages between 10 and 15 volts DC. This circuit does not require an external power supply. The calibration pot RV1 is utilised here. A potential divider circuit is formed by resistor R3 and POT RV1. The brightness of LEDs is controlled by this resistor. A resistor connects the IC’s 6th and 7th pins to the ground. The external switch sw1, which is attached to the IC’s 9th pin, selects this mode. The capacity of the battery is displayed in either dot mode or display mode via the LEDs (D1-D10) in this circuit. Get a sense of how the linked post – How Does an LM317-Based Automatic Battery Charger Work? Battery Level Indicator Circuit Diagram Circuit Components Because the current is regulated by the IC, there are no resistors in series with the LEDs in this design. This IC accepts an analogue input voltage and drives 10 LEDs linearly based on that voltage. The LM3914 IC is at the heart of this battery level indicator circuit. Battery Level Indicator Circuit Principle This circuit is designed based on lM3914 IC (Integrated chip).