Description:This module is based on resistive voltage divider design principles, It is capable of reducing the voltage of the input terminal connection five times.You can use a 5V maximum voltage on the ADC side of the module so which allows for a maximum of 25V on the input side.If 3.3V is used, the input voltage must not exceed 16.5V.Because AVR chips use 10 bit ADC, the maximum resolution of this module is 0.00489V (5V / 1023), so the voltage detection module detects minimum input voltage is 0.00489V × 5 = 0.02445V.Parameters:Input voltage range: DC0-25VVoltage detection range: DC0.02445V - 25VVoltage analog resolutions: 0.00489VDC Input: positive terminal connected to VCC, GND negative poleOutput interface: "+" then 5 / 3.3V, "-" then GND, "s" then the AD pinSize: Approx 27*14*12mm/ 1.06 x 0.55 x 0.47inchReference Code:#includeint val11;int val2;void setup (){pinMode (LED1, OUTPUT);Serial.begin (9600);Serial.println ("Logicware.com.au");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);}Package includes:5Pcs Voltage Sensor Module