Voltage Measurement using Arduino

1float input_volt = 0.0;
2float temp=0.0;
3float r1=10000.0;    //r1   value
4float r2=100000.0;      //r2 value
5
6void setup()
7{
8   Serial.begin(9600);      //  opens serial port, sets data rate to 9600 bps
9}
10
11void loop()
12{
13     int analogvalue = analogRead(A0);
14    temp = (analogvalue * 5.0) / 1024.0;   // FORMULA USED TO CONVERT THE VOLTAGE
15    input_volt = temp / (r2/(r1+r2));
16     if (input_volt < 0.1) 
17    {
18      input_volt=0.0;
19    } 
20    Serial.print("Voltage=   ");                 // prints the voltage value in the serial monitor
21    Serial.print(input_volt);
22     Serial.println(" Volts");
23    delay(1000);
24}
25

1float input_volt = 0.0;
2float temp=0.0;
3float r1=10000.0;    //r1  value
4float r2=100000.0;      //r2 value
5
6void setup()
7{
8   Serial.begin(9600);     //  opens serial port, sets data rate to 9600 bps
9}
10
11void loop()
12{
13    int analogvalue = analogRead(A0);
14    temp = (analogvalue * 5.0) / 1024.0;  // FORMULA USED TO CONVERT THE VOLTAGE
15    input_volt = temp / (r2/(r1+r2));
16    if (input_volt < 0.1) 
17    {
18      input_volt=0.0;
19    } 
20    Serial.print("Voltage=  ");                 // prints the voltage value in the serial monitor
21    Serial.print(input_volt);
22    Serial.println(" Volts");
23    delay(1000);
24}
25