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A project log for Digital Arduino Voltmeter

A Voltmeter or a Voltage Meter is a measuring instrument that is used for measuring voltage.

hIOTronhIOTron 12/03/2019 at 08:330 Comments
/*
DC Voltmeter */
#include LiquidCrystal lcd(7, 8, 9, 10, 11, 12);
int analogInput = 0;
float vout = 0.0;
float vin = 0.0;
float R1 = 100000.0; // resistance of R1 (100K) -see text!
float R2 = 10000.0; // resistance of R2 (10K) - see text!
int value = 0;
void setup(){   pinMode(analogInput, INPUT);   lcd.begin(16, 2);   lcd.print("DC VOLTMETER");
}
void loop(){   // read the value at analog input   value = analogRead(analogInput);   vout = (value * 5.0) / 1024.0; // see text   vin = vout / (R2/(R1+R2));    if (vin<0.09) {   vin=0.0;//statement to quash undesired reading !
} lcd.setCursor(0, 1);
lcd.print("INPUT V= ");
lcd.print(vin);
delay(500);
}

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