Yes!
Additional circuitry or sensors can be attached to EmotiBit using the stacking headers. You can checkout the schematic linked in our documentation for more information on available pins and usage. Some GPIOs are free to use. Others are used by EmotiBit, so make sure you do not create a conflict.
Most sensors are supported by i2c. EmotiBit runs the onboard sensors on a custom I2C instance on separate pins.
We recommend connecting any additional sensors on the standard I2C interface. See the Feather stock i2c lines (see SCL[23]&SDA[24] pins). We intentionally left this open for users to interface with external sensors.
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