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Voltage Sensor Module

Voltage Sensor is a precise low-cost sensor for measuring voltage. It is based on the principle of resistive voltage divider design. It can make the red terminal connector input voltage to 5 times smaller.


Voltage Sensor Module Pinout Configuration

Pin Name




Positive terminal of the External voltage source (0-25V)


Negative terminal of the External voltage source


Analog pin connected to Analog pin of Arduino


Not Connected


Ground Pin connected to GND of Arduino


Voltage Detection Sensor Module Features & Specifications

  • Input Voltage: 0 to 25V
  • Voltage Detection Range:  0.02445 to 25
  • Analog Voltage Resolution: 0.00489V
  • Needs no external components
  • Easy to use with Microcontrollers
  • Small, cheap and easily available
  • Dimensions: 4 × 3 × 2 cm


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Related Components: HMC5883L, Resistors, Voltage Regulator IC


Brief about Voltage Sensor Module

Voltage Detection Sensor Module is a simple and very useful module that uses a potential divider to reduce any input voltage by a factor of 5. This allows us to use the Analog input pin of a microcontroller to monitor voltages higher than it capable of sensing. For example, with a 0V - 5V Analog input range, you are able to measure a voltage up to 25V. This module also includes convenient screw terminals for easy and secure connections of a wire.

The internal circuit diagram of the Voltage Sensor Module is given below.

Voltage Detection Sensor Internal Circuit

The voltage circuit consists of a voltage divider circuit of two resistors in which R1 is 30K and R2 is 7.5K.


How to Use Voltage Sensor Module with Arduino

Interfacing a voltage sensor with Arduino or any other microcontroller is pretty straight forward. Connect the VCC and GND of voltage source whose voltage to be measured to the screw terminals of the voltage sensor. Connect the S and – (GND) pins of voltage sensor to Analog pin and GND of Arduino respectively.

Input and output voltage can be calculated using:

Vin = Vout * (R2/(R1+R2))
Here R1 = 30K ohm and R2 = 7.5K ohm
Vout = (analogvalue * 5 / 1024).

Arduino Voltage Sensor Module Circuit Working

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