The circuit is powered by the 12V power supply using SMPS or you can use a 12V battery as well as the maximin current will be around 60-70mA for powering the Arduino and LCD screen. This circuit is further divided into two parts, first is a low 5V supply for Arduino Nano and 16×2 Alphanumeric LCD screen and their connections to display the results of the current and voltage measurements in real-time. The explanation of the circuit is as follows. The complete circuit diagram for the 18650 battery capacity tester is shown below. Components RequiredĪrduino Battery Capacity Tester Circuit Diagram If you do not get the claimed battery capacity while the cell voltage is within the specified limits, then that cell is faulty and you should not use that as the State of Charge of the cell will deplete at a very fast rate under load, creating a local current loop if used in a battery pack resulting in heating and possibly fire. So we are going to build a 18650 battery capacity tester for a Li-Ion 18650 Cell which will discharge a fully charged 18650 cell through a resistor while measuring the current flowing through the resistor to calculate its capacity.
#Arduino 12v battery voltage monitor how to
So how to test a lithium battery if the cell is not one of these cheap knockoffs? One of the methods is to measure the open-circuit voltage at no load and loading but this is not at all reliable. When you buy these cells either they do not work at all or if they do, the charge capacity or the current flow is so low that they cannot work with the application at all. There are many battery vendors in the market selling the cheap knock off versions of Li-ion batteries claiming bizarre specifications with a very low price which is too good to be true. Why Do We Need a Battery Capacity Tester?
Previously we have also built a 18650 battery charger and booster module and an IoT based battery monitoring system, you can check them out if interested. Out of many different types of batteries available, Lead Acid batteries, Ni-Cd batteries, and Ni-MH batteries are not suitable as they either weigh more or cannot provide the current required for our application, this leaves us with the lithium-ion batteries which can provide high current while keeping the weight low and size compact. If you want to know more about batteries, you can also read this article on basic terminologies of battery.
#Arduino 12v battery voltage monitor portable
With this increase in complexity, the power requirement of the circuit has also increased and in our quest to make the device as small and as portable as possible, we need a battery which can provide high current for a long period of time and at the same time, weigh much less so that the device should remain portable. With the advent of technology, our electronic gadgets and appliances are becoming smaller and smaller with more functional and complex applications.
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