skule.sormo.no

This module is based on a resistive divider principle design, make the interface terminal input voltage reduced 5 times, Arduino analog input voltage up to 5V, then the input voltage of the voltage detection module can not be greater than 5V × 5 = 25V (if used 3.3V system, the input voltage can not exceed 3.3Vx5 = 16.5V). Because Arduino AVR chips used in 10 AD, so the resolution of the analog module is 0.00489V (5V / 1023), so the voltage detection module detects a minimum input voltage of 0.00489V × 5 = 0.02445V.

Voltage input range: DC0-25V
Voltage detection range: DC0.02445V-25V
Voltage Analog Resolution: 0.00489V
DC input connector: Terminal cathode connected to VCC, GND negative pole
Output interface:
+ 5V or 3.3V
- GND 
S Arduino AD pins

Reference code:

# include <Wire.h>

int val11;

int val2;

void setup ()

{

pinMode (LED1, OUTPUT);

Serial.begin (9600);

Serial.println ("Emartee.Com");

Serial.println ("Voltage:");

Serial.print ("V");

}

void loop ()

{

float temp;

val11 = analogRead (1);

temp = val11/4.092;

val11 = (int) temp ;/ /

val2 = ((val11% 100) / 10);

Serial.println (val2);

delay (1000);