2-wire AC Voltmeter with LED Display Panel - 70V ~ 500V AC
SKU: TH0912
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SKU: TH2226
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.
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 |
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 |
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.
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.
Yes. The AC current signal conversion module accepts 3.3V to 5.5V input and is described as compatible with 3.3V/5V microcontrollers.
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.
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.
The open-type probe has a 13 × 13 mm opening size and a 1 m cable. The signal conversion module measures 32 × 27 mm.
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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