ACS712 5A Hall Effect Current Sensor Module

The ACS712 chip is sold in several current ranges (5A, 20A, 30A), and choosing the right one matters for accuracy: a 30A-range sensor reading a 200mA signal wastes most of its resolution on a range it will never see, while this 5A version dedicates its full measurement resolution to smaller currents - exactly the range most low-power electronics, small motors, and battery-charging circuits actually draw. Its 185mV/A sensitivity (roughly double the 100mV/A of the 20A version) is what delivers that finer resolution.

Like the rest of the ACS712 family, it measures current via the Hall effect - sensing the magnetic field generated by current flowing through an internal conduction path - so there's no direct electrical connection between the measurement circuit and the current path itself, keeping the sensing side electrically isolated. It handles both AC and DC current equally well, converting either into a proportional analog voltage output.

Common uses are monitoring small motor or servo current draw, battery charge/discharge current logging on low-power projects, and any current-sensing application where the actual currents involved are well under 5A and finer resolution than a higher-range ACS712 variant would matter.