Keyestudio ESP32 Manual page 93

ESP32 Starter Kit
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5. Test Result
After connecting the wiring and uploading code, open the serial monitor and set the baud rate to 9600. When we press
the button, serial port prints "Key status: 0"; When we release it, serial port prints "Key status: 1".
6. Knowledge Expansion
Next, we will control the LED through the state of buttons.
Flow Chart
8.5. Arduino Project 89