The ACS712 30A Current Sensor Module measures current up to 30A using the Hall effect (a phenomenon where a magnetic field produced by current flow generates a proportional voltage). The current sensor outputs an analog voltage that changes by 100mV for every 1 amp of current flowing through it. At zero current, the output sits at 2.5V. When current increases, the output rises or falls from that midpoint depending on direction.
The acs712 module uses galvanic isolation between the high-current path and the signal output. One non-obvious detail — the 100mV/A sensitivity means a 10A change produces only 1V of output change. At 30A full scale, the output swings from 2.5V down to about 0.5V or up to 4.5V. Reading small currents like 0.5A requires a microcontroller ADC (Analog to Digital Converter) with at least 10-bit resolution to see meaningful changes.
The sensor acs712 connects to Arduino and ESP32 analog pins directly. Engineering students and power monitoring project makers all use it regularly. To start, wire the current-carrying conductor through the module’s input pins, connect the output to an ADC pin, and read the voltage. StemVolt supplies this module tested with confirmed midpoint output at zero current.
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Features:
- Current range up to 30A covers most motor, pump, and high-load DC circuit monitoring applications
- Sensitivity at 100mV per amp outputs a measurable analog voltage change at each ampere of current
- Analog output from the module maps directly to Arduino ADC input without any additional signal conditioning
Technical specifications:
| Specification | Details |
|---|---|
| Item Type | Current Sensor Module |
| Model | ACS712 |
| Current Range | 30A |
| Sensitivity | 100 mV/A |
Applications:
- Battery charger monitor uses this sensor to measure charging current flowing into a 12V battery
- Solar panel project uses this to read how much current the panel delivers to a charge controller
- ACS712 30A Current Sensor Module measures motor draw current and triggers an alert at overload threshold
Package includes:
- 1 x ACS712 30A Current Sensor Module
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