// Analog 5 v   
/*
Parameter:
Voltage input range: DC0-25V
Voltage detection range: DC0.02445V-25V
Voltage analog resolution: 0.00489V

 *** sensorDC25v.-R7.5K-analogPIN-R30K-GND. ***

*/
int val1; 
int val2; 

void setup() 
{   
 pinMode(A0, INPUT);   
 Serial.begin(9600);   

 Serial.println("Voltage: ");   
} 
void loop() 
{       
 float temp;       
 val1 = analogRead(A0);   
    //val1 = 127;   // DC 25 v

 temp = val1 / 4.092;      // ****** 4.092 ***** (1023/4.092 = 250)  250/10 = 25v ****

 val1 = (int)temp;         //       
 //val1 = (int)temp;        //  

 val2 = ((val1 % 100)/10);    // 0.x

 float volt = temp / 10; 

 Serial.println(temp); 
 Serial.println(volt);   
 Serial.println(val2);          
 delay(1000); 
}

//  25v - 4096 
//  4095/250 = 16.38
//  2048*16.38/10 = 12.503 v