The Gravity: I2C Digital Wattmeter (SEN0291) is a compact, high-resolution, and high-accuracy module designed to measure voltage, current, and power for a wide range of electronic modules and electrical systems. Capable of measuring up to 26V and ±8A, this wattmeter is ideal for evaluating power consumption, battery life, and solar energy system efficiency.
Key Features
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Wide measurement range: 0–26V, ±8A, up to 206W
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High resolution: 4mV (voltage), 1mA (current), 4–20mW (power)
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Maximum relative error: ±0.2% (after calibration)
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Bidirectional current sensing on the high side – detect charging and discharging states
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Based on TI INA219 current/power monitor chip with low temperature drift
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10mΩ alloy sampling resistor with high precision and 2W power rating
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Compatible with 3.3V and 5V controllers – works with Arduino, ESP32, Raspberry Pi
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Selectable I2C address (via DIP switch): 0x40, 0x41, 0x44, 0x45
Applications
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Solar power management systems
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Battery fuel gauging
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DC motor protection and overload detection
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Power consumption monitoring of sensors, microcontrollers, and full projects
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IoT energy efficiency testing
Whether you're monitoring a battery-powered sensor node, measuring motor load, or optimizing solar charge/discharge efficiency, this module provides precise, real-time data.
Specifications
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Input Voltage (VCC): 3.3V – 5.5V
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Voltage Measurement Range: 0 – 26V
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Voltage Resolution: 4mV
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Voltage Error: < ±0.2%
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Current Measurement Range: ±8A (Bidirectional)
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Current Resolution: 1mA
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Current Error: < ±0.2% (Manual calibration required)
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Power Range: 0 – 206W
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Power Resolution: 20mW (Hardware), 4mW (Software)
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Quiescent Current: 0.7mA
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Interface: Gravity I2C (3.3V logic level)
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I2C Addresses: 0x40, 0x41, 0x44, 0x45 (selectable via DIP switch)
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Dimensions: 30mm × 22mm (1.18in × 0.87in)
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Weight: 4g
Package Includes
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1 × Gravity: I2C Digital Wattmeter (SEN0291)
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1 × Gravity 4-Pin I2C/UART Sensor Cable