Voltage Sensor Module 25V

The Voltage Sensor Module 25V is a compact and reliable analog voltage sensing module designed to measure DC voltages up to 25V safely using a microcontroller. The module functions as a precision voltage divider, reducing higher input voltages to a lower, safe voltage level that can be read directly by the analog input (ADC) of development boards such as Arduino, ESP32, ESP8266, STM32, PIC, AVR, NodeMCU, and Raspberry Pi (with an external ADC).

The module is commonly used for monitoring battery voltage, power supply output, solar panel voltage, charging systems, and other DC power sources. By converting high DC voltages into a proportional analog signal, it enables microcontrollers to perform accurate voltage measurements without exposing their analog input pins to potentially damaging voltage levels.

Designed for simplicity and reliability, the Voltage Sensor Module requires no additional active components or external power supply. It consists of a precision resistor network that provides a fixed voltage division ratio, allowing continuous and real-time voltage monitoring. Its compact PCB design and straightforward three-pin interface make it easy to integrate into embedded systems, automation equipment, IoT devices, robotics, and educational electronics projects.

The module is suitable for students, hobbyists, engineers, and developers who require a simple, cost-effective solution for monitoring DC voltage in electronic circuits and battery-powered applications.

Working Principle

The Voltage Sensor Module operates using a precision resistor voltage divider circuit. When a DC voltage is applied to the input terminals, the resistor network proportionally reduces the voltage to approximately one-fifth of its original value. For example, an input voltage of 25V is reduced to approximately 5V, which is within the safe operating range of most 5V analog inputs.

The reduced analog voltage is connected to the microcontroller's ADC input, where it is converted into a digital value. Using the known voltage divider ratio and ADC reference voltage, the microcontroller calculates the actual input voltage through software.

Since the module contains only passive components, it provides stable, fast, and reliable voltage measurement with minimal power consumption.

Key Features

Measures DC voltages up to 25V.

Precision resistor voltage divider design.

Provides proportional analog voltage output.

Protects microcontroller analog inputs from high voltage.

Simple three-pin interface for easy connection.

Compatible with both 3.3V and 5V microcontroller systems.

Compact and lightweight PCB design.

No external power supply required.

Low power consumption.

Easy software calibration.

Stable and reliable measurement performance.

Compatible with Arduino, ESP32, ESP8266, Raspberry Pi (with external ADC), STM32, PIC, AVR, 8051, NodeMCU, and PLC systems.

Ideal for embedded, automation, and IoT applications.

Suitable for educational and professional electronics projects.

Technical Specifications

Module Type: Analog DC Voltage Sensor

Maximum Input Voltage: 25V DC

Measurement Range: 0–25V DC

Output Type: Analog Voltage

Voltage Divider Ratio: Approximately 5:1

Interface: Analog Output (AO), VCC, GND

Operating Logic Level: Compatible with 3.3V and 5V systems

Power Consumption: Very Low (Passive Circuit)

Measurement Accuracy: Depends on ADC resolution and software calibration

PCB Design: Compact Through-Hole Module

Operating Temperature: Suitable for standard indoor operating environments

Applications

Battery voltage monitoring.

Solar panel voltage measurement.

DC power supply monitoring.

Power management systems.

Battery charging systems.

IoT monitoring devices.

Industrial automation.

Embedded system development.

Robotics and mobile robots.

Renewable energy projects.

Laboratory testing and experiments.

Educational electronics training.

DIY electronics and prototype development.

Voltage measurement and data logging systems.

Electronic instrumentation projects.

Package Includes

1 × Voltage Sensor Module 25V

Note

This module is designed only for DC voltage measurement and should not be used for measuring AC mains voltage. Ensure that the input voltage does not exceed 25V DC, as higher voltages may damage the module or the connected microcontroller. For best accuracy, calibrate the measurement in software according to your ADC reference voltage and microcontroller resolution.