Initialize the LCD library with I2C address and LCD sizeĪdc_voltage = (adc_value * ref_voltage) / 1024. Floats for resistor values in divider (in ohms) Floats for ADC voltage & Input voltage measuring DC Voltage using Arduino and voltage sensor up to 25Volts Not only Arduino UNO microcontroller but also you can use Arduino NANO, etc., The communication pins SDA and SCL are connected to A4 and A5 of Arduino respectively. The power pins VCC and GND of LCD display are connected to 5V and GND of Arduino. The LCD display has 4 pins 2 pins for power and 2 pins for communication. On the other side the voltage to be measured whose +ve and -ve pins are connected to VCC and GND respectively. The – pin of sensor is connected to GND pin of Arduino. Circuit Diagram to interface voltage sensor with ArduinoĬonnect all the required components according to the below circuit diagram.Īs you can see from the above circuit diagram the voltage detection sensor module signal pin S is connected to Analog pin A0 of Arduino. Follow the below schematic diagram to build own voltage sensor with range 0-25V DC.Īs you can see from the above 2 resistors are connected in series and signal pin is connected between them. This circuit reduces the voltage by 5 times. we can even build the circuit by our own with a very few components as 2 resistors 7.5KΩ and 30KΩ. GND: Negative terminal for the external voltage source (0-25v)īuild Own voltage sensor using below Schematic diagram:Īs we already discussed this sensor works with the principle of voltage divider circuit.VCC: Positive terminal for the external voltage source (0-25v).3 pins are male head connectors which are to be connected to Arduino and other 2 pins has a plastic screw pin terminals where the voltage to be measured is connected. Voltage detection range: DC 0.02440V-25Vįrom the above pinout diagram we can notice there are 5 pins to voltage sensor module.Related: Measure AC current by interfacing ACS712 sensor with ESP32 Technical specifications: For 3.3V system the input voltage should not be greater than 16.5v as 3.3X5=16.5.For 5V systems the input voltage should not be greater than 25V.Which makes the voltage 5 times smaller, 25/5=5 thus with this we can measure up to 25V.Īrduino AVR chips have 10-bit ADC, so this module simulates a resolution of 0.00488V (5V/1024), so the minimum voltage of input voltage detection module is 0.00488Vx5(for 25v)=0.02440V. With the help of it the voltage is divided by 5. This Voltage sensor is small and low cost module whose principle is based on Resistive voltage divider circuit. Voltage Detection sensor Module overview: So, in this article we teach you, the principle of this voltage sensing module, how it works and how to interface it with Arduino and display the voltage values on 16X2 LCD display with I2C adapter and where it is useful. So, with the help of this Voltage sensor we can measure up to 25V from Arduino Analog pins. This works as a DC voltmeter with maximum 25V.Īs you all know Arduino and few other microcontroller can measure up to 5V directly from the analog pins, but if you want to measure the voltage beyond 5V, it is not possible and even if you connect more than 5V the chip may get damaged or burnt. In this Arduino Project, you will learn how to build an Arduino voltage sensor which can measure the DC voltages ranging from 0 to 25 Volts. Measuring Solar panel voltage using Voltage sensor with Arduino:.Measuring Battery voltage using Voltage sensor with Arduino:.Program code for Arduino Voltage sensor.Circuit Diagram to interface voltage sensor with Arduino.Build Own voltage sensor using below Schematic diagram:.Voltage Detection sensor Module overview:.Here is a snippet of code I use with the 1. As the battery voltage drops the voltage range the ADC will be measuring will be reduced, and so the fixed voltage will rise within that range giving you higher readings from the ADC. That could be from a small LDO voltage regulator that is below the voltage of the minimum voltage you will care about from your battery, or something like the forward voltage drop of a silicon diode (~0.7V) - something where you know what the voltage is.įrom that reading you can then back-track what the supply voltage must be in order to give you the reading it has given you. Then you need to use the ADC to measure the fixed known voltage. You need to check which module you have and which pins are available on it. Arduino is 5 volts tolerant so that Arduino analog pins can accept only. We can’t connect the Arduino analog pin directly with 12 volts battery. We need an ADC to measure the battery voltage. Some ESP8266 modules have a single analog input available, and some don't. Monitoring a DC battery voltage is nearly the same as what we studied so far. Some form of fixed voltage reference to compare the battery voltage against.There are two things you need to measure the battery of the system that is doing the measuring of the battery:
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