Adafruit INA238 DC Current Voltage Power Monitor, STEMMA QT, 6349

Do you want to measure current, voltage, and power cleanly with a single board? The INA238 delivers highly accurate data via I2C – high-side or low-side, up to +85 V bus voltage, with an integrated precision shunt. Perfect for prototypes, test jigs, and continuous monitoring.

• 16-bit ADC: resolution down to 0.15 mA (10 A mode) or 42 µA (2.75 A mode)
• Integrated 15 mΩ shunt, 0.1% – no external sense resistor required
• Measures current, bus voltage, and calculated power – better than 1% accuracy
• High-side or low-side sensing, common-mode up to +85 VDC (DC only, no AC)
• I2C, 3–5 V logic, configurable alarms, oversampling, and gain
• Up to 4 sensors per bus via address jumper
• Compatible with Arduino, CircuitPython, and Raspberry Pi
• STEMMA QT / Qwiic for solder-free I2C cabling
• Includes 3.5 mm terminal block and pin headers (headers require soldering)

Power the board with 3–5 V, connect SDA/SCL, wire VIN+/- into your load – done. Example code and libraries make getting started easy.

Ideal when you need reliable measurements from milliamps up to amps.