Created November 21, 2019 © GPL3+

Arduino Wattmeter - Voltage, Current and Power Consumption

A device can be utilized to measure the power consumed. This circuit can also act as a Voltmeter and Ammeter to measure voltage and current.

Intermediate19

Arduino Wattmeter - Voltage, Current and Power Consumption

Things used in this project

Hardware components

Arduino UNO

Adafruit RGB Backlight LCD - 16x2

LM 358 Op Amp

Linear Regulator (7805)

Single Turn Potentiometer- 10k ohms

Ceramic Disc Capacitor, 0.1 µF

Resistor 10k ohm

Resistor, 20 kohm

Resistor 2.21k ohm

Resistor, 0.22 ohm

Test load

Software apps and online services

Arduino IDE

Story

Building your own meters not only carries down the cost of testing but also provides us room to facilitate the process of testing.

Working of the Project:

From the sensor part, there are two sections that are reliable for measuring voltage and current. For measuring the voltage, a voltage divider circuit is executed using a 10KΩ and a 2.2KΩ Resistor.

With the help of these resistors, you can easily measure voltages up to 24V. These resistors also support us in taking the voltage range to 0V – 5V, which is the normal range on which Arduino works.

In order to measure the current, we have to change the current values to conventional voltage values. As per Ohm’s Law, the voltage drop across a load is proportional to the current. Hence, a small shunt resistor is arranged with respect to the load. By estimating the voltage across this resistor, we can calculate the current.

We have used LM358 Op-Amp in Non-Inverting Amplifier Mode to magnify the values provided to Arduino. The voltage divider network for the feedback control includes a20KΩ Resistor and 1KΩ Resistor. These resistors offer a gain of approximately 21.

After Implementation Arduino Wattmeter

To learn more about such IoT Devices, IoT Traning Online is the better way to learn.

Run a program

#include <LiquidCrystal.h>  

int Read_Voltage  = A1;
int Read_Current  = A0;
const int rs = 2, en = 4, d4 = 9, d5 = 10, d6 = 11, d7 = 12; 
LiquidCrystal lcd(rs, en, d4, d5, d6, d7);
float Voltage = 0.0;
float Current = 0.0;
float Power = 0.0;
void setup() 
{
  lcd.begin(16, 2); 
  Serial.begin(9600);

  lcd.print("     Arduino    "); 
  lcd.setCursor(0, 1);
  lcd.print("    Wattmeter   "); 

  delay(2000);
  lcd.clear();

}

void loop() 
{
 
 Voltage = analogRead(Read_Voltage);
 Current = analogRead(Read_Current);

 Voltage = Voltage * (5.0/1023.0) * 6.46;
 Current = Current * (5.0/1023.0) * 0.239;

 Serial.println(Voltage);
 Serial.println(Current);

 Power = Voltage * Current;

 Serial.println(Power);


 lcd.setCursor(0, 0);
 lcd.print("V="); lcd.print(Voltage); 
 lcd.print(" "); 
 lcd.print("I=");lcd.print(Current); 
 lcd.setCursor(0, 1);
 lcd.print("P="); lcd.print(Power); 
 delay(1000);
}

Credits

hIOTron

78 projects • 2 followers

hIOTron is an internet of things based company that offers an IoT Platform, products, IoT Solutions, and IoT Training.

Arduino Wattmeter - Voltage, Current and Power Consumption

Things used in this project

Hardware components

Software apps and online services

Story

Code

Run a program

Credits

hIOTron

Comments

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Arduino Wattmeter - Voltage, Current and Power Consumption

Arduino Wattmeter - Voltage, Current and Power Consumption

Things used in this project

Hardware components

Software apps and online services

Story

Code

Run a program

Credits

hIOTron

Comments

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