25V DC Voltage Sensor Module for Arduino & ESP32

This module lets a microcontroller read a DC voltage up to 25V, well past what any analog input pin can safely handle on its own. Internally it is a precision resistor divider that scales the input down to a safe 0-5V range before it reaches the signal pin, so a project can monitor a battery pack or a power supply rail without the extra components a hand-built divider would need.

Wiring is three pins: power, ground, and the scaled analog signal, which reads directly on an Arduino analog input or an ESP32 ADC pin after the usual calibration against a multimeter reading. It is a common building block in battery monitors, solar charge controllers and power supply testers where the microcontroller itself cannot tolerate more than 3.3V or 5V directly.

Compatible with Arduino, ESP32, ESP8266 and Raspberry Pi (through its ADC), making it a drop-in choice across most hobbyist microcontroller platforms.