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Battery level indicator
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Here we present a circuit that tells you the level of a battery from the number of brightening LEDs. It uses ten LEDs to show the full level. So if there are three LED lights, it means that the capacity of the battery is 30 percent.
The circuit we are creating here is based on a comparator IC (LM3914).
LM3914 uses ten comparators, which divides the inner potential into ten parts depending on the split-split rule.
This circuit takes power from the battery for its work. Using different color LEDs makes it even easier to find the level of the accumulator. Like the red LED, the level of the accumulator is less than 40 percent. And the orange LED tells that the value is between 40 and 70. And finally, the green LED tells that the value is above 70.
The brightness of the LED can be reduced or increased by changing the value of resistor between pins 6 and 7.
LM3914 uses ten comparators, which divides the inner potential into ten parts depending on the split-split rule.
This circuit takes power from the battery for its work. Using different color LEDs makes it even easier to find the level of the accumulator. Like the red LED, the level of the accumulator is less than 40 percent. And the orange LED tells that the value is between 40 and 70. And finally, the green LED tells that the value is above 70.
The brightness of the LED can be reduced or increased by changing the value of resistor between pins 6 and 7.
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The work of diode D1 is to save the circuit from any reverse connection.
The tenth LED flashes when the capacity of the battery is completed, i.e. the battery is fully charged. When the battery is fully charged, the relay turns on by the transistor prevents it from going further charged.
For calibration, add the potential of 15 volts to the place of the battery in the circuit. Keep in mind that this potential should come from a variable power source. So that we can reduce it and increase it.
Initially, vary VR1 by giving 3 volts so that the first LED glows. Now increase the potential in the 1.2 volt and let the 10th LED glow.
Now the circuit is ready to show the value of any potential in relation to maximum potential. Now we easily estimate the battery voltage by just counting the number of LEDs glowing. Let’s say the five LEDs are glowing in this situation, the capacity of the battery is 50 to 59 percent of the maximum.
Author: – Anirudh Kumar Sharma
— Ani-Lab —
Initially, vary VR1 by giving 3 volts so that the first LED glows. Now increase the potential in the 1.2 volt and let the 10th LED glow.
Now the circuit is ready to show the value of any potential in relation to maximum potential. Now we easily estimate the battery voltage by just counting the number of LEDs glowing. Let’s say the five LEDs are glowing in this situation, the capacity of the battery is 50 to 59 percent of the maximum.
Author: – Anirudh Kumar Sharma
— Ani-Lab —
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