SunFounder 3in1 Kit
If your board is already plugged in, but not recognized, check if the INSTALLED logo appears in the Arduino UNO
R4 Boards section of the Boards Manager, if not, please scroll down a bit and click on INSTALL.
Reopening the Arduino IDE and re-plugging the Arduino board will fix most of the problems. You can also click Tools
-> Board or Port to select them.
2. Verify the Sketch
After clicking the Verify button, the sketch will be compiled to see if there are any errors.
64 Chapter 2. Get Started with Arduino
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