Now, enhance the input voltage to 15V in steps of 1.2V right up until the corresponding LED (LED2 through LED10) illuminates. Gradually alter VR1 until eventually LED1 glows. This stops the charging by way of normally open (N/O) contacts of relay RL1.įor calibration, connect 15V adjustable, regulated power source and at first set it at 3V.
BATTERY INDICATOR DRIVER
When the battery is fully charged, relay driver transistor T1 performs to energise relay RL1. The tenth LED glows only if the battery power is full, i.e., the battery is totally charged. The brightness of the LEDs could be fine-tuned by altering the value of variable resistor VR2 in between pins 6 and 7.ĭiode D1 prevents the circuit from reverse-polarity battery connection.
Orange LEDs (LED4 through LED6) show battery power of 40 to lower than 70 percent and green LEDs (LED7 through LED10) show battery power of 70 to below 100 percent. Red LEDs (LED1 through LED3) show battery power of lower than 40 percent. Applying various coloured LEDs helps make it simplier and easier to determine the voltage level on the basis of the calibration made. It utilizes 10 LEDs connected in a 10-dot mode. The circuit gets the power source for its operation from the battery of the instrument itself. So it splits the battery level into 10 portions. The LM3914 utilizes 10 comparators, that are internally built in the voltage divider network according to the current division rule. Different from in mobile phones in which the battery level indicator functionality is integrated with other functions, in this circuit just one single comparator IC (LM3914) does it all. So if 3 LEDs light, it signifies battery power of 30 percent. On this page we provide a circuit that helps you to recognize the battery level of a instrument from the quantity of LEDs which are glowing. This helps you to effortlessly acknowledge the battery level. In general, in mobile phones, the battery levels is displayed in dot or bar style.
Here the circuit diagram of simple and easy made battery level indicator.
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