![]() Make sure that the car ignition key and all the lights are turned off. Yet, there are some things drivers should know:įirstly carefully check your car ignition before procedure. Selecting digital voltmeter will be the best, because its easier to read and gives you an accurate measurement. One is analogue and other one is digital voltmeter. There are 2 types of voltmeter you can select to test your battery. ![]() ![]() In order to understanding how to test a car battery, knowing the usage of the voltmeter is very important. Voltmeter Voltmeter is necessary to perform this trick. Here are 6 most common ways of checking your car battery collected by Car From Japan authors that may be useful for you: #1. Testing car battery and electrical system regularly helps your car operate properly and reduce the chances of failure. How to Test A Car Battery by 6 Interesting Ways Here, we’re going to provide you 6 amazing ways to do it. To keep your best car battery in tip-top condition, it’s essential to know how to test a car battery. The whole system of your ride depends on it and proper maintenance. Regular battery testing can ensure you that, it is ready to start your vehicle in any condition. And the last LM3914 IC pin 9 should be connected to pin 11 of previous IC with20K resistor in parallel with LED9.Battery is very important part of a car. For dot display- Leave the pin 9 (mode selector pin) open.Īnd if you want to cascade more LM 3914 IC than connect pin 9 of first IC to pin1 of next LM3914Ĭontinue connecting pin 9 of lower input drivers to pin 1 of higher input drivers for 30, 40, or more LED displays. For Bar graph display- Connect pin 9 directly to pin 3(supply voltage pin)Ģ. If you want the change the dot display to bar display just incorporate following changes-ġ. Similarly connect yellow LED’s (LED4 to LED6) this will indicate battery capacity of 40 to 70 percent and remaining you can use Green LED. You can also connect different color LED for obtaining the status like connect RED LED’s as it is the sign of danger (LED 1 to LED3) which will indicate that that voltage level is less than 40 percentage and need to be taken care. And now by seeing the number of LED’s glowing you can easily calculate the status. Connect it to voltage from any battery to be tested at the input which will become power source for the circuit. If above phenomenon is happening your circuit is ready is use. Following table will show the voltage level when different LED will glow – Now, increase the input voltage in steps of 1.2V and see LED2 will glow in 2.4V and similarly increase the voltage in steps of 1.2V and LED3 will glow and so on. 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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