blink example

.editorconfig

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+root = true
+
+[*]
+indent_style = space
+indent_size = 4
+end_of_line = lf
+charset = utf-8
+trim_trailing_whitespace = true
+insert_final_newline = true
+
+[{*.c,*.ino,*.h}]
+indent_style = space
+indent_size = 2
+
+[*.md]
+trim_trailing_whitespace = false

Difficulty 01/blink/blink.ino

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+/*
+  Blink BUILTIN LED example
+
+  Author: Alexander Popov
+  License: Unlicense
+*/
+
+#include "start.h"
+
+/* Blink method:
+   true  -- delay() used
+   false -- millis() used */
+bool blink_method = true;
+bool led_state = HIGH;
+unsigned long timer = 0;
+
+void setup() {
+  pinMode(LED_BUILTIN, OUTPUT);
+
+  init_blink(5, 70);
+}
+
+void loop() {
+  // blink_method = true
+  if (blink_method == true) {
+    digitalWrite(LED_BUILTIN, HIGH);
+    delay(1000);
+    digitalWrite(LED_BUILTIN, LOW);
+    delay(1000);
+  }
+  // blink_method = false
+  else {
+    if (millis() - timer > 200) {
+      led_state =! led_state;
+      digitalWrite(LED_BUILTIN, led_state);
+
+      timer = millis();
+    }
+  }
+}

Difficulty 01/blink/start.h

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+/*
+  Author: Alexander Popov
+  License: Unlicense
+*/
+
+void init_blink(int times, int delay_time) {
+  for (int count = 0; count < times; count++) {
+    digitalWrite(LED_BUILTIN, HIGH);
+    delay(delay_time);
+    digitalWrite(LED_BUILTIN, LOW);
+    delay(delay_time);
+  }
+}