A simple but very useful module which uses a potential divider to reduce any input voltage by a factor of 5. This allows you to use the analogue input of a microcontroller to monitor voltages much higher than it capable of sensing. For example with a 0-5V analogue input range you are able to measure a voltage up to 25V. The module also includes convenient screw terminals for easy and secure connection of a wire.
Specification:
- Divider ratio: 5:1
- Resistor Tolerance: 1%
- Max input voltage: 25V
- Resistor Value: 30K/7.5K Ohm
Pinout:
- INPUT
- Pin 1 - GND
- Pin 2 - 0-25V
- OUTPUT
- Pin 1 - Sense
- Pin 2 - NC
- Pin 3 - GND
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);
}