Digital Voltmeter

A Voltmeter is an instrument used for measuring the potential difference between the two points in the electrical circuit.

Why we called Digital Voltmeter ?

General Purpose analog voltmeter may have accuracy of few percent of FSD.They are used with Voltage from a fraction of a volt to several thousand volts.

Despite this,Digital Voltmeter can be made with high accuracy typically better than 1% .That’s why Digital Voltmeter is preffered where high accuracy is required.

CONCEPTS USED IN PROJECT:

Following concepts are used in doing this project and their purpose is also mentioned as follows :

 

1  ADC                      Converting analog value to digital
2  LCD interfacing     To Display voltage

SOFTWARES USED IN PROJECT

Following softwares are used in doing this project and their purpose is also mentioned as follows :


SR. NO Software         
1            Atmel studio 6.1   

2            Proteus 7.9          

COMPONENTS DETAIL

SR. NO COMPONENT AMOUNT

1             Resistors        1 K

2             Capacitor      0.1uF

3             Inductors        1H,2H,3H

4             IC’S                Atmega 16

5             PCB    

DETAIL DESCRIPTION OF PROJECT:


Micro controller take the input (DC voltage) which is to measure.
First of all analog value is converted it into digital value using internal 10 bit ADC.
Atmega 16 have internal 10 bit adc….and It has eight analog input channel..
When It converts analog to digital, we using formula Dout=vin/step size to calculate the VIN.
Since the step size and Dout is known we simply calculate the VIN by vin=Dout*stepsize and print vin on the LCD.
So this way we made digital voltmeter.

IMPORTANT COMPONETNS OF THIS PROJECT:
1. Microcontroller
Most important component taking all the decisions and all the coding is done in it .
2. LCD
Lcd is used to the measure voltage.

Uses:
Following are the places where mobile controlled robot can be used .
Used to measure DC Voltage in the any circuit in the range (0-20 volts).
FUTURE DEVELOPMENT:

1. Multi Range
Multi range Volmeter can be made by connecting some push button to select range.
2. Ameter
Similarly ammeter can be constructed by some changes for measuring current.
ADVANTAGES:
1. Accurate measuring of DC voltage in the range of (0-20 volts ) with precision of 1%.
2. Easily increase range with small change in code and external Voltage divider resistor value.

DISADVANTAGES:
1. Only measure DC voltage...not AC
2. Not flexible because Cost per unit is high...Atmega 16 is to costly.

Its coding and Schematic will be uploaded in next Blog tutorial so stay connected for Its coding plus Schematic tutorial.