Gravity INA219 I2C Digital Wattmeter

The Gravity wattmeter from DFRobot measures voltage, current and power with the INA219 from TI, up to 26 V and ±8 A. The current is measured at a 10 mOhm shunt in both directions, so also when charging and discharging a battery. The values are sent via I2C to an Arduino, ESP32 or Raspberry Pi, four addresses can be selected with the DIP switch.

The cable has Dupont sockets. For the female header on the Arduino UNO it can be converted to male plugs with Dupont Cables M-M 10cm 20 Pieces.

Recommended Accessories:

• Dupont Cables M-M 10cm 20 Pieces

Features:

• Voltage, current and power in one module
• Bidirectional current measurement on the high side
• Relative error typically below ±0.2 %, after a simple manual calibration (DFRobot)
• Four I2C addresses, up to four modules on one bus
• For 3.3 V and 5 V controllers

Application Examples:

• Measuring the consumption of projects and modules
• Charge and discharge current of batteries and solar systems
• Monitoring motor current, for example in case of overload

Documentation:

• DFRobot Wiki SEN0291
• Arduino example by DFRobot
• Schematic (PDF)
• INA219 datasheet (PDF)

Technical Data:

• Manufacturer: DFRobot
• Manufacturer SKU: SEN0291
• Chip: INA219
• Input voltage (VCC): 3.3 to 5.5 V
• Voltage range (IN+ or IN- to GND): 0 to 26 V
• Voltage resolution: 4 mV
• Relative voltage error: < ±0.2 % (typical)
• Current range: 0 to ±8 A (bidirectional)
• Current resolution: 1 mA
• Relative current error: < ±0.2 % (typical, manual calibration required)
• Power range: 0 to 206 W
• Power resolution: 20 mW (hardware) / 4 mW (software)
• Quiescent current: 0.7 mA
• Interface: Gravity I2C, logic level 0 to VCC
• I2C address: 0x40, 0x41, 0x44 or 0x45
• Connections: VCC, GND, SCL, SDA, 3-pin measuring terminal
• Dimensions: 30 × 22 × 12 mm
• Weight: 14 g

Scope of Delivery:

• 1× Gravity INA219 I2C Digital Wattmeter
• 1× Gravity I2C/UART sensor cable
• 1× pin header 1×4