How to light the LED from an engineer's point of view-Arduino IDE C programming

Look at the hardware schematic first:
image
LED blue light connected to pin 13 of Arduino
This is simple, directly operate the IO port.


Select the serial port, select the board type as Arduino UNO, compile and upload to the board. See the phenomenon, blinking every other second.

Related Source:
How to use mblock to control a light sensor module