I2C Digital Wattmeter Gravity

DFRobotSKU: RB-Dfr-819
Manufacturer #: SEN0291

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Sale price $10.06

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Only 2 units left

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  • I2C Digital Wattmeter Gravity
  • Offers high precision, high resolution, large range, low-temperature drift
  • Features a bidirectional current high side measurement
  • Is compatible with a 3.3V/5V controller
  • Is easy to embed in the project

The I2C Digital Wattmeter Gravity is a high-resolution, high-precision, large-scale measurement module that can measure the voltage, current, and power of various electronic modules and electrical equipment within 26 V 8 A, and the maximum relative error is no more than ±0.2 % (A simple manual calibration is required before usage).

It can be used for power consumption or battery life evaluation of solar energy systems, battery, motors, controller or electronic modules.

  • 1 x Gravity: I2C Digital Wattmeter
  • 1 x XH2.54-4P Black Header
  • 1 x Gravity-4P I2C/UART Sensor Wire


  • 30 x 22 mm / 1.18 x 0.87 in
  • Input Voltage (VCC) : 3.3 V~5.5 V
  • Voltage Range (IN+ or IN- relative to GND): 0 ~ 26 V
  • Voltage Resolution: 4 mV
  • Voltage Relative Error: <±0.2% (Typical)
  • Current Range: 0 ~ ±8 A (Bidirectional current)
  • Current Resolution: 1 mA
  • Current Relative Error: <±0.2 % (Typical, manual calibration required)
  • Power Range: 0 ~ 206 W
  • Power Resolution: 20 mW (Hardware) / 4 mW (Software)
  • Quiescent Current: 0.7 mA
  • Interface: Gravity I2C (logic level: 0-3.3V)
  • I2C Address: Four options 0x40, 0x41, 0x44, 0x45
  • Weight: 4 g


  • Solar Power Management
  • Battery Fuel Gauge
  • Electronic Module Power Evaluation

Customer Reviews

Based on 4 reviews
Comes with convenient Cable

Wattmeter works as advertised. It comes with a convenient cable that plugs into the white connector

Livré avec un câble pratique

Wattmètre fonctionne comme annoncé. Il est livré avec un câble pratique qui se branche sur le connecteur blanc

Fonctionne bien avec le code mis à jour

Le code Arduino fourni avec la bibliothèque ne fonctionne PAS correctement, il affiche la tension du bus et du shunt, mais des lectures de courant et de puissance incorrectes. L'exemple mis à jour de DFRobot sur Github fonctionne correctement -> https://github.com/DFRobot/DFRobot_INA219/blob/master/example/getVoltageCurrentPower/getVoltageCurrentPower.ino Fonctionne très bien avec Arduino Unos, clones, NodeMCU / 8266 ainsi que D1Mini.

Works Fine with updated code

Arduino code that comes with the library does NOT work correctly, It shows Bus and Shunt voltage, but incorrect Current and Power readings. Updated example from DFRobot on Github works correctly -> https://github.com/DFRobot/DFRobot_INA219/blob/master/example/getVoltageCurrentPower/getVoltageCurrentPower.ino Works fine with Arduino Unos, clones, NodeMCU/8266 as well as D1Mini's.

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