INA226_USI

Arduino library for INA226 power sensor for ATtiny.

Derived class developed by Peter.Simoons, 2026-08-08

Description

Experimental

The INA226_USI implements the INA226 library (based upon 0.6.6) for the Atmel ATtiny85 et al. The INA226 library was adapted to implement a small voltage and current monitor for a power supply, and works well.

The ATtiny85 et al uses TinyWireM and USI_TWI_Master for I2C. These replaces the TwoWire I2C API in the code.

Detailed description see https://github.com/RobTillaart/INA226 as that is the leading library for developments.

Feedback as always is welcome.

Testing

The INA226_USI library is only tested and confirmed to work with ATtiny85 hardware. A test sketch compiled well for the ATtiny44/45/64/65/84, although not tested on actual hardware.

The library is too big for the ATtiny24/25, so the idea popped up to make an integer only derived library with a minimal API to keep footprint as small as possible.

Support

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Thank you,