Voltage Sensor Module 25V

What this module is

The Voltage Sensor Module (025V) is a simple analog sensor used to measure DC voltage using microcontrollers like Arduino or ESP32.

It does NOT directly measure high voltage It uses a voltage divider circuit to reduce voltage safely

Working Principle

• The module scales down input voltage using resistors

• Converts:

  • 025V input 05V output

   

• This output is read by Arduino analog pin

Internally uses a resistor divider (30k + 7.5k)

Key Specifications

• Input Voltage Range: 0 25V DC

• Output Voltage: 0 5V (safe for Arduino)

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• Operating Voltage: 3.3V5V

Pinout

Input Side (High Voltage)

• VCC / + Positive voltage to measure

• GND / - Ground

Output Side (Microcontroller)

• S (Signal) Analog pin (A0 etc.)

• + 5V / 3.3V

• - GND

Formula to Calculate Voltage

Since voltage is divided by 5:

Vinput=Vanalog5V_{input} = V_{analog} \times 5Vinput=Vanalog5

Example:If Arduino reads 2V, actual voltage = 10V

Applications

• Battery voltage monitoring

• Power supply measurement

• Automotive voltage sensing

• ry Important)

  • Do NOT exceed 25V input may damage Arduino

  • Measures only DC voltage (not AC)

  • Cannot measure negative voltage

  • For ESP32 (3.3V ADC): max measurable 16.5V

  When to use this vs other sensors

  Why it's useful

  • Very cheap & simple

  • No complex library needed

  • Perfect for