top of page
Description : 
This module is based on resistance points pressure principle, and it can make the input voltage of red terminal reduce 5 times of original voltage.
The max Arduino analog input voltage is 5 V, so the input voltage of this module should be not more than 5 V x 5 = 25 V ( if for 3.3 V system, the input voltage should be not more than 3.3 V x 5 = 16.5 V ).
Because the Arduino AVR chip have 10 bit AD, so this module simulation resolution is 0.00489 V (5 V / 1023), and the input voltage of this module should be more than 0.00489 V x 5 = 0.02445 V.

Voltage measuring module

$5.00Price
  • Special Parameters :
    1、Voltage input range : DC0-25 V
    2、Voltage detection range : DC0.02445 V-25 V
    3、Voltage analog resolution : 0.00489 V
    4、DC input interface : red terminal positive with VCC, negative with GND

    Referrence Test 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);
    }

Accepted payment methods:

bottom of page