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| #include <LiquidCrystal.h>
LiquidCrystal lcd(7,8,9,10,11,12);
int analogInput = 0;
int analogInput1 = 1;
float vout = 0.0,vout1 = 0.0,vin = 0.0,vin1 = 0.0;
float vinnew=0.0;
float R1 = 680000.0;
float R2 = 27000.0;
float R3=100000.0;
float R4=100000.0;
float value = 0.0;
float value1 = 0.0;
void setup() {
lcd.begin(20,4);
pinMode(analogInput, INPUT);
pinMode(analogInput1, INPUT);
lcd.setCursor(0,2);
lcd.print("voltmeter");
delay(100);
}
void loop() {
lcd.setCursor(0,0);
lcd.print(" V A");
value = analogRead(analogInput);
value1 = analogRead(analogInput1);
vout = (value * 5.0) / 1024.0;
vin = vout / (R2/(R1+R2));
vout1 = (value1 * 5.0) / 1024.0;
vin1 = vout1 / (R4/(R3+R4));
lcd.setCursor(0, 1);
if (vin<0.1)
{
vin=0.00;
}
vinnew=4*vin1;
if (vinnew<0.1)
vinnew=0.0;
lcd.print(vin);
lcd.setCursor(8, 1);
lcd.print(vinnew);
delay(500);
} |