AJMRTC 2PCS MAX471 3A Current Sensor Module, DC 0-3A Load Consumption Current Detection Module, High-Side Current Sensing Board for Arduino ESP32 STM32 Microcontroller Project

AJMRTC MAX471 current sensor module pack includes 2 pieces of high-side current sensing boards, designed for measuring DC load current consumption within 03A range. Equipped with original MAX471 current-sense amplifier IC and internal 35m precision sense resistor, it delivers up to 2% measurement accuracy across operating temperature, offering consistent and trustworthy readings for electronic testing and embedded development. It adopts high-side monitoring architecture, which means it is installed on the positive power line instead of ground loop, avoiding ground disturbance issues that commonly appear in low-side sampling circuits.

The module outputs analog voltage signal proportionally to the measured current at a typical sensitivity of 1V per Ampere. The OUT pin can be directly connected to the analog input port of Arduino, ESP32, STM32, AVR and other mainstream microcontrollers. The SIGN pin provides open-collector signal to identify current flow direction, helping you distinguish charging and discharging status in battery power systems. It supports working voltage from 3V to 36V on the measured power line, covering most lithium battery packs, DC power supplies and small motor drive circuits.

Low quiescent current design keeps power consumption minimal during long-time continuous monitoring. Screw terminal blocks are adopted for power input and load output, allowing fast wire installation without soldering. It is widely used for battery capacity testing, power consumption logging, motor current monitoring, robot power management, DIY electronic projects and industrial small-current sampling. The two-module set is convenient for dual-channel current detection or backup use in your lab and project builds.

Specifications

1. Brand: AJMRTC
2. Chip: MAX471
3. Quantity: 2PCS
4. Detection Range: DC 0 ~ 3A
5. Sensing Type: High-side current sensing
6. Sensitivity: 1V/A typical
7. Measured Power Voltage: DC 3V ~ 36V
8. Accuracy: 2%
9. Output: Analog voltage + SIGN direction signal
10. Interface: Screw terminals + pin header
11. Compatible MCU: Arduino, ESP32, STM32, AVR
12. Application: Battery monitoring, Motor current test, Power consumption detection, Electronic DIY project