For the Arduino Uno R4, this library defines two I2C buses. The first, "Wire" is configured for the SDA/SCL pins on the pin header, where "Wire1" is configured for the Qwiic connector.

Documentation for Arduino boards can be found under Arduino Wire Library. Note that not all boards support multiple I2C buses and that it is recommended to use a custom pull-up resistor configuration, ...

Well tech tinkerer Joe Desbonnet has whipped up what he dubs "poor man's NFC" using an Arduino, some magnet wire, and any compass-equipped Android smartphone (which is almost all of them).

Step-by-step guide on designing and programming a custom I2C slave sensor device using Arduino. Who Won and Lost in Trump’s Tax Bill Scientists tracking ‘interstellar’ object that has come ...