Adafruit INA219 FeatherWing High Side DC Current Sensor

The Adafruit INA219 FeatherWing is a precision current and voltage sensor that simplifies power-monitoring tasks. It allows you to measure both high side voltage and DC current over I2C with 1% precision, making it ideal for power-sensitive projects.

This FeatherWing uses the INA219 chip, which can measure up to ±3.2 Amps with a 0.1 ohm sense resistor and offers fine resolution through its internal 12-bit ADC. It communicates over I2C and supports changing the address to allow up to 4 FeatherWings on a single Feather controller.

Note that due to chip shortages as of October 2022, the design uses either the INA219A or INA219B variant in SOT-23 or SOIC packages. The INA219A has ±1% max current measurement error, while the INA219B has ±0.5% error, both across the full temperature range.

Key features include high side current measuring up to +26VDC, precision amplification, and compatibility with all Feather boards. Comprehensive tutorials are available for use with Arduino and CircuitPython.

• Measure high side voltage and DC current with 1% precision
• I2C communication with configurable address for up to 4 devices
• Supports measurements up to ±3.2A and voltage up to +26VDC
• Compact FeatherWing form factor compatible with all Feather boards
• Updated design uses INA219A or INA219B chip variants
• Includes 0.1 ohm sense resistor; can be replaced for different ranges

Refer to the Adafruit INA219 tutorial for detailed usage and programming guidance.