DFRobot Gravity v2.1.0 - I2C Digital Wattmeter

A module that allows you to measure electric energy consumption of up to 26 V / 8 A. The maximum measurement error is approx.0,2%(before the first use, it requires a simple calibration). It can be used tomeasure the actual current consumption or evaluationof the service lifeof the battery.The kit includes a cable adapted to Gravity DFRobot IO Expansion Shield.

• Solar power management
• The battery indicator
• The indicator of the power consumption of the electric device

The product is compatible withArduino

User manual for the connection and sample code can be found onthe website of the manufacturer.

Example of connection with Arduinoandanalog PH sensor

The chip usesTI INA219system with the zero temperature of drift of monitoring the current/power and resistor of 10mΩ with high power of 2 W and low temperature of drift. The resolution of voltage and current is4 mVand1 mA. The module has4 I2C addressesselectable withDIP switch. It accurately measures the high, bi-directional currents which is especially useful in applications that usesolar orbattery  power in which the rechargeable battery should be charged and discharged.

Connection example withRaspberry Pi

• Version: 2.1.0
• Supply voltage: from 3.3 V to 5 V
• Voltage measurement range: 0 V to 26 V
• Resolution voltage: 4 mV
• Error of voltage measurement: up to 0,2% (typical)
• Measuring range of the current: from 0 to 8 A (bi-directional)
• Resolution of the current: 1 mA
• Error of current measurement: up to 2% (typical, it requires manual calibration)
• The range of power measurement: from 0 to 206 W
• Resolution power: 20 mW (hardware) / 4 MW (software)
• Quiescent current: 07 mA
• Interface: I2C Gravity
• I2C address: 0x40, 0x41, 0x44, 0x45
• Dimensions: 30 x 22 mm
• Weight: 4 g

• The website of the manufacturer of DFRobotSEN0291
• User manual
• Diagram of the module
• System and size
• Documentation for the TI INA219