# How To Measure Battery Voltage Using Arduino

### Measure the battery voltage.

How to measure battery voltage using arduino.

The voltage can be found out using this formula. 8 2v is beyond maximum of arduino pin voltage which is 5v and it will fry that pin if plugged directly. The voltage divider factor is calculated by dividing the first voltage by the second. For this purpose you should connect the p3 connector to the power supply.

In this article we measure external voltage using arduino. The arduino s analog pin acts as a simple voltmeter where the voltage value is retrieved. Now measure the voltage across the 100k resistor r2 i e. Connect a stable power supply such as a 9v battery across the resistor network.

4 1 5 1023 839 rounded. We also display the voltage reading on an lcd 16 2 display. 0v corresponds to 0 adc reading and 5v corresponds to 1023. Before connecting a battery to the device and measuring its capacity you can examine the circuit using a power supply.

In this tutorial we will learn how to measure voltage using arduino. A voltage v1 proportional to the measured voltage will appear at the junction of two resistors. Then we can convert the analog value into a digital voltage value by using the adc conversion formula. Between arduino pin a3 and gnd.

Let s say our battery has 8 2 volts left in it. So we need a pair of resistors as voltage divider which divides the battery voltage to 8 2 2 4 1v. Arduino internal adc reference voltage is 5v vref 5v so maximum voltage that we can measure without using external circuit is 5v. There are two main paths to take.

It is having 10 bit resolution 2 10 1024 values for 0 to 5v scale. A tutorial in which i talk about reading voltage into arduino. It is good to understand that batteries have what we call a level of charge. To measure av voltage you will need to have a zmpt101b module.

You can also call it a digital voltmeter. All you have to do is connect vcc of the module to 5v of the arduino gnd to ground of the arduino and vout to analogue pin 0 of the arduino. It can be understood as the amount of voltage contained in your battery. That 4 1v is read by arduino pin as.

By using arduino and this voltage measuring sensor we can measure voltages up to 25v. Measure the voltage across both resistors together i e. Less than 5v and greater than 5v. Never apply any voltage higher than 5v or in reverse polarity to the battery input otherwise you will permanently damage the arduino s.

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