Ac Voltmeter Using Arduino

Made by hIOTron / Productivity / Security / IoT

About the project

We are going to create an AC Voltage Measuring Device using Arduino, which will estimate the voltage of Alternating Current.

Project info

Difficulty: Moderate

Platforms: Arduino

Estimated time: 1 hour

License: GNU General Public License, version 3 or later (GPL3+)

Items used in this project

Hardware components

	Resistor Network - 10K Ohm (6-pin bussed)	x 1
	Resistor 10K Ohm 1/4 Watt PTH - 20 pk	x 1
	Arduino MKRFOX 1200	x 1
	Diode Rectifier - 1A 400V (1N4004)	x 1
	Transformer	x 1
	Zener Single Diode, 5.1 V	x 1
	Capacitor 1 µF	x 1

Software apps and online services

Arduino IDE

Story

Circuit Diagram

Do the circuit connections as shown in the above circuit diagram.

Working of Project

1. Step down voltage is obtained on the l.v side of the transformer which is fit to utilize across normal power rating resistors.

2. Then we receive specific voltage value across the 4.7k resistor.

3. Arduino utilizes this voltage as input from pin A0 in the form of analog values between 0 to 1023. 0 is considered as 0 volt and 1023 being 5v.

4. Arduino then changes this analog value into corresponding mains a.c. voltage by a formula.

n=(311/1023)*m volts or n=(m*.304177)

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Code

Run a program

int m;// initialise variable m
float n;//initialise variable n

void setup()
{
  pinMode(A0,INPUT); // set pin a0 as input pin
  Serial.begin(9600);// begin serial communication between arduino and pc
}

void loop()
{
  m=analogRead(A0);// read analog values from pin A0 across capacitor
   n=(m* .304177);// converts analog value(x) into input ac supply value using this formula ( explained in woeking section)
  
   Serial.print("   analaog input  " ) ; // specify name to the corresponding value to be printed
   Serial.print(m) ; // print input analog value on serial monitor
   Serial.print("   ac voltage  ") ; // specify name to the corresponding value to be printed
   Serial.print(n) ; // prints the ac value on Serial monitor
   Serial.println();
}