Features

• Input voltage range : DC 0 ~ 25V
• Voltage detection range : DC 0.02445V ~ 25V
• Voltage analog resolution : 0.00489V
• DC input connector : the positive terminal connected to VCC, the negative pole GND
• Output interface (to Arduino / AVR board): "+" to 5 / 3.3V, "-" to GND, "s" to Arduino Analog input pin
• Size : 23mm * 14mm
  

#include

int VAl11; int val2;

void Setup ()
{
pinMode (LED1, the OUTPUT);
Serial.begin (9600);
the Serial .println ( "Emartee.Com");
Serial.println ( "Voltage:");
Serial.print ( "V");
}
void Loop ()
{
a float TEMP;
VAl11 = analogRead (1);
TEMP = VAl11 / 4.092 ;
VAl11 = (int) TEMP; //
val2 = ((VAl11 100%) / 10);
Serial.println (val2);
Delay (1000);
}