DFRobot
Gravity: I2C Digital Wattmeter
Gravity: I2C Digital Wattmeter is a high-resolution, high-precision, large-scale measurement module that can measure the voltage, current and power of variou...
Gravity: I2C Digital Wattmeter 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 26V 8A, 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.
The module adopts TI INA219 zero temperature drift current/power monitoring chip and 2W high power low temperature drift 10mΩ alloy sampling resistor. The voltage and current resolution can reach 4mV and 1mA respectively. Under the full scale measurement condition, the maximum relative error of voltage and current measurement can be superior to ±0.2%. It also provides four I2C addresses that can be configured via the 2P DIP switch. The module accurately measures bi-directional high-side currents (current flowing through the power supply or battery positive), which is especially useful in solar or battery fuel gauge applications where the battery needs to be charged and discharged. This status can be simply determined by positive or negative current readings. In the motor applications, the current can be monitored in real time by monitoring whether the motor current is too large due to overload. In addition, you can use this module to measure the power consumption of various electronic modules or the entire project to evaluate battery life.
CONNECTION DIAGRAM
Gravity: I2C Digital Wattmeter Connection Diagram (Arduino UNO)
Gravity: I2C Digital Wattmeter Connection Diagram (Raspberry Pi 3B)
Measuring the power consumption of the Gravity: pH meter
Monitor the power consumption of the solar panel, battery and outputs of a solar system
FEATURES
- High precision, high resolution, large range, low temperature drift
- Bidirectional current high side measurement
- Compatible with 3.3V/5V controller
- Sophisticated and compact, easy to embed in the project
APPLICATIONS
- Solar Power Management
- Battery Fuel Gauge
- Electronic Module Power Evaluation
SPECIFICATION
- Input Voltage (VCC) : 3.3V~5.5V
- Voltage Range (IN+ or IN- relative to GND): 0 ~ 26 V
- Voltage Resolution: 4 mV
- Voltage Relative Error: <±0.2% (Typical)
- Current Range: 0 ~ ±8A (Bidirectional current)
- Current Resolution: 1mA
- 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
- Dimension: 30.0mm*22.0mm/1.18*0.87 in
- Weight: 4g
DOCUMENTS
Jargon buster
Plain-language definitions for the technical terms used above.
- DIP switch
- A DIP switch is a small set of physical on/off switches used to configure hardware settings without software. It matters because changing features such as auto power-on or charging limits may require moving these tiny switches correctly.
- Gravity
- Gravity is DFRobot’s plug-in connector system for sensors, motors and modules, using standard cables to reduce loose jumper wiring. It matters because Gravity-compatible parts can connect directly to these ports, while non-Gravity parts may need adapters or manual wiring.
- I2C
- I2C is a two-wire communication bus used by many sensors and small modules. It matters because several I2C devices can share the same two wires, but each device needs a compatible address and your controller must support I2C.
- I2C address
- An I2C address is the number a device uses so a microcontroller can tell it apart from other devices on the same I2C bus. It matters because two devices with the same fixed address may conflict if used together.
- pH
- A measure of how acidic or alkaline a liquid is, on a scale where 7 is neutral. For a water monitoring kit, pH tells you about water chemistry and whether the included probe matches the range and accuracy your project needs.
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