Voltage Sensor Module

This module is designed based on the principle of resistive voltage division, which can reduce the input voltage of the terminal interface by 5 times. The maximum analog input voltage of Arduino is 5V, so the input voltage of the voltage detection module cannot be greater than 5V×5=25V (if 3.3V is used system, the input voltage cannot be greater than 3.3Vx5=16.5V). Because the AVR chip used by Arduino is 10-bit AD, the analog resolution of this module is 0.00489V (5V/1023), so the minimum input voltage detected by the voltage detection module is 0.00489V×5=0.02445V.

Specifications:

• Voltage input range: DC0-25V;

• Voltage detection range: DC0.02445V-25V;

• Voltage analog resolution: 0.00489V;

• DC input interface: the positive pole of the terminal is connected to VCC, and the negative pole is connected to GND;

• Output interface: "+" connects to 5/3.3V, "-" connects to GND, "s" connects to the AD pin of Arduino.

Code example:

#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);

}

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