![]() If voltages are not appearing change the baud rate of serial monitor to 9600 bps. You will definitely see batteries voltages displayed on the serial monitor. Once you made circuit just download the code in your arduino and open the serial monitor. ![]() We will explore techniques for controlling DC motors. DC voltage and current are available or needed. In this tutorial we will learn how to control DC motors using Arduino and the L298N motor driver. Delay 400 is a necessary delay needed here to properly make and break connections.Ĭalculated batteries voltages will be displayed on the serial monitor of arduino ide. Im using DIP and will monitor 5 cell voltages and battery current to use all 6 analog inputs. The two batteries becomes short and your circuit will be fried away. If you energize two relays at the same time and their are batteries connected across relay terminals. The concept is simple enough: you connect the positive and negative terminals of the battery together via two resistors in series. This is where a voltage divider comes in. ![]() Both are above the 3.3V limit for the GPIO pins on the ESP32 board. Note that when one relay is energized others are off. The 18650 Li-Ion cell I’m using has a nominal voltage of 3.7V and a maximum, when fully charged, of 4.2V. Next the other relay is energized and same process is repeated for the four batteries. Converts raw voltage value to actual battery voltage and closes the relay connection. In the loop function first a single relay is energized as soon as the relay contacts are made battery voltages appears across the voltage divider circuit.
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