# Current and voltage sensor MAX471, GY-471 3A, 3-25V

> GY-471 module with MAX471 sensor for measuring current (up to 3A) and voltage (3-25V DC). Compatible with Arduino and other 3.3-5V boards. Analog output for current and voltage via a 1:5 voltage divider. Allows detection of current direction (charging/discharging). Current sense resistor 35mOhm, direction resistor 2KOhm. Suitable for testing power supplies, batteries and embedded projects.

- Page: https://sigmanortec.ro/en/current-and-voltage-sensor-max471-gy-471-3a-3-25v
- Price: 20.91 RON
- Availability: In stock; 1-2 zile
- Reference: 9102 · EAN: 5940576590787
- Category: Mechatronics and IoT > Sensors and Modules > Voltage and Current Sensors
- Specifications: Nominal Current: 3 A; Supply Voltage: 3; Maximum Input Voltage: 25; Input Voltage Type: “DC” in Romanian can mean **“de ce”**, which translates to **“why”** in English.
- Package (shipping data): 0.004 kg
- Updated: 2026-09-14
- Shop: [Sigmanortec.ro](https://sigmanortec.ro/en/llms.txt)
- Prices: RON, VAT included; prices and stock as of 2026-10-22 03:25 (Europe/Bucharest)

## Description

Compact module for monitoring consumption, measures current up to 3A and voltage up to 25V, compatible with Arduino and other 3.3-5V. Provides analog output for current and voltage through a 1 to 5 divider, allows detection of current direction during charging or discharging, ideal for testing power supplies, batteries and embedded projects.
Current and voltage sensor, compatible with Arduino and other development boards, GY 471, measures up to 3A and voltage between 3 and 25V.
The voltage measurement is done analogically on the principle of the voltage divider to reduce the voltage by 5 times.
Board voltage measurement limits on 5V: 25V (5Vx5=25V)
Board voltage measurement limits on 3.3V: 16.5V (3.3Vx5=16.5V)
The resolution is 0.00489V (5V/1023), so the minimum measurable voltage is 0.02445V.
The module can measure current consumption up to 3A. It has a 35mΩ current sensing resistor and a 2KΩ sense resistor.
It can also measure the direction of the current, having the possibility to measure the direction of the current (discharging as well as charging).
Specifications:
Supply voltage: 3.3 - 5V
Current measurement: up to 3A
Voltage measurement: 0 - 25V