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In the circuit, ESP32-S3 WROOM's GPIO2 is connected to the LED, so the LED pin is defined as 2.
This means that after this line of code, all LED_BUILTIN will be treated as 2.
In the setup () function, first, we set the LED_BUILTIN as output mode, which can make the port output high
level or low level.
// initialize digital pin LED_BUILTIN as an output.
pinMode(LED_BUILTIN, OUTPUT);
Then, in the loop () function, set the LED_BUILTIN to output high level to make LED light up.
digitalWrite(LED_BUILTIN, HIGH); // turn the LED on (HIGH is the voltage level)
Wait for 1000ms, that is 1s. Delay () function is used to make control board wait for a moment before executing
the next statement. The parameter indicates the number of milliseconds to wait for.
delay(1000); // wait for a second
Then set the LED_BUILTIN to output low level, and LED light off. One second later, the execution of loop ()
function will be completed.
digitalWrite(LED_BUILTIN, LOW); // turn the LED off by making the voltage LOW
delay(1000); // wait for a second
The loop() function is constantly being executed, so LED will keep blinking.
Reference
void pinMode(int pin, int mode);
Configures the specified pin to behave either as an input or an output.
Parameters
pin: the pin number to set the mode of.
mode: INPUT, OUTPUT, INPUT_PULLDOWM, or INPUT_PULLUP.
void digitalWrite (int pin, int value);
Writes the value HIGH or LOW (1 or 0) to the given pin which must have been previously set as an output.
For more related functions, please refer to https://www.arduino.cc/reference/en/
Reset operation will lead the code to be executed from the beginning. Switching on the power, finishing
uploading the code and pressing the reset button will trigger reset operation.
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