Gravity Analog AC Current Sensor 20A with Open-Type Probe
SKU: TH2226
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Non-contact 20A AC current sensor with open-type transformer probe and Gravity analog conversion module. Works with 3.3V-5.5V controllers for safe AC load monitoring.
$19.90
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Overview
DFRobot Gravity: Analog AC Current Sensor (20A) is a non-contact current measurement set for monitoring AC loads without cutting wires or altering the circuit. It combines an open-type AC transformer probe with an AC current signal conversion module, making it easy to bring AC current sensing into Arduino and other 3.3V/5V-class microcontroller projects.
The probe clamps around a single AC conductor and outputs a corresponding signal to the conversion module, which provides a 0.2-2.8V DC analog output through the Gravity PH2.0-3P interface. This makes it suitable for AC motor monitoring, lighting systems, electrical equipment measurement, and automation projects where isolation and easy installation matter.
Important: the AC transformer probe must clamp around only one AC wire. It cannot be clamped around both conductors at the same time.
Specifications
Technical details for the 20A version of the Gravity Analog AC Current Sensor.
| Brand | DFRobot |
|---|---|
| Model / SKU | Gravity: Analog AC Current Sensor, 20A / SEN0211 |
| Module Input Voltage (VCC) | 3.3V-5.5V |
| Interface | Gravity Analog (PH2.0-3P), analog voltage output 0.2-2.8V DC |
| AC Voltage Input Range | 0-1V AC RMS |
| Module Relative Error | ±4% |
| Module Dimensions | 32×27 mm / 1.26×1.06 in |
| Module Weight | 5g |
| Probe AC Current Range | 0-20A |
| Probe Signal Output | Standard Φ3.5mm 3P plug, 0-1V AC voltage, linear corresponding range 0-20A |
| Probe Accuracy | ±1% |
| Non-linearity | ≤±0.2% |
| Frequency Range | 50Hz~1kHz |
| Cable Length | 1m |
| Working Temperature | -25 ℃~+70 ℃ |
| Opening Size | 13×13 mm / 0.51×0.51 in |
| Probe Weight | 50g |
Pinout & Integration Notes
Pin configuration and practical setup details for quick integration with Arduino and similar controllers.
| Pin | Name | Function |
|---|---|---|
| 1 | - | GND |
| 2 | + | Power input, 3.3V-5.5V |
| 3 | A | Analog signal output, 0.2-2.8V DC |
| 4 | Φ3.5mm 3P plug | AC transformer input signal |
Using It in Projects
The sensor is compatible with 3.3V to 5.5V controllers. In the reference Arduino examples, the module is connected to analog pin A2, and readings are viewed either on the Serial Monitor at 115200 baud or on an LCD shield.
For best results, calibrate the code’s reference voltage value to match your controller’s actual analog reference voltage. The example code also uses a detection range setting that should match the probe range; for this model, the correct range is 20A.
Frequently Asked Questions
What does the Gravity Analog AC Current Sensor (20A) measure?
This version is designed to measure AC current from 0 to 20A using a non-contact open-type AC transformer probe. It is intended for applications such as AC motor monitoring, lighting, and other electrical equipment measurement.
Does this sensor work with 3.3V and 5V microcontrollers?
Yes. The AC current signal conversion module accepts 3.3V to 5.5V input and is described as compatible with 3.3V/5V microcontrollers.
What output does the module provide to a controller?
The conversion module uses a Gravity analog interface (PH2.0-3P) and outputs an analog DC voltage of 0.2V to 2.8V. The probe connects to the module through a standard 3.5mm 3P plug, with the probe side specified as 0 to 1V AC output.
Can I clamp the probe around a full AC cable with both wires together?
No. The guide specifically states that the AC transformer probe can only clamp to one AC wire and cannot be clamped around both at the same time.
What are the probe size and cable length?
The open-type probe has a 13 × 13 mm opening size and a 1 m cable. The signal conversion module measures 32 × 27 mm.
How do I set it up with Arduino?
The reference example connects the module to the Arduino UNO's A2 analog pin. In the sample code, the detection range should be set to 20 for this 20A version, and the VREF value can be adjusted for better calibration accuracy.
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