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Hackaday · SensorsCurated

I²C sensors via USB on any Linux computer

Summary

Hackaday explains an ATtiny85 adapter that makes I²C sensors available via USB as a regular Linux I²C bus. The example names the BMP280 and Si1145. Debian Sid already contained a suitable BMP280 driver.

Ideas

  • An ATtiny85 runs the I2C-Tiny-USB firmware.
  • The kernel recognises the adapter as an I²C controller.
  • i2c-dev allows direct access from userland programs.
  • Existing IIO drivers integrate supported sensors.

Insights

  • Standardised kernel classes make DIY hardware immediately usable with existing tools.
  • A small microcontroller can form a clean protocol bridge.
  • Generic drivers are more valuable in the long term than device-specific scripts.

Facts

  • The adapter uses an ATtiny85.

Recommendations

  • Check I²C voltage levels and pull-up resistors.
  • Use kernel drivers before converting raw data yourself.

References

Read the original article

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