Install STM Arduino
const int MYPIN = PC8;
// the setup function runs once when you press reset or power the board
void setup() {
// initialize digital pin LED_BUILTIN as an output.
pinMode(MYPIN, OUTPUT);
}
// the loop function runs over and over again forever
void loop() {
digitalWrite(MYPIN , HIGH); // turn the LED on (HIGH is the voltage level)
delay(1500); // wait for a second
digitalWrite(MYPIN, LOW); // turn the LED off by making the voltage LOW
delay(1500); // wait for a second
}