It will support wide temperature range from 0 degree to +70 degree Celsius.įor calibrating the circuit, apply the power supply and adjusts VR1 so that LED1 just start glowing. In this we do not require resistor with the LED’s because current drive to LED’s is regulated and programmed.Ħ. This IC can also work on 3V power supply.ĥ. You can cascade more IC’s up to 100 steps.Ĥ. This IC can drive LED’s, LCD or vacuum fluorescent display.ģ. In this user can easily select the dot or bar graph display just by changing a single pin.Ģ. LM3914 is a monolithic integrated circuit which senses the analog voltage and derives 10 LED’s providing a linear analog display.ġ. This simple battery level indicator circuit is based on single IC LM3914 with few more discrete components. 1: Prototype of Battery Level Indicator Circuit on Breadboard Advantage of this circuit is it does not require power supply it will take power supply from the battery of the device itself.įig. So before your battery dies you can recharge it. You can use this battery level indicator circuit with your inverter or with your car battery it will give you indication about your battery status. For example four LED's are glowing means battery capacity is 40 percent. Battery level indicator will let you know the status of battery of a device just by glowing the number of LED's.
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