void setup() {
        // initialize digital pin LED_BUILTIN as an output.
        pinMode(LED_BUILTIN, OUTPUT);
      // the loop function runs over and over again forever
      void loop() {
        digitalWrite(LED_BUILTIN, HIGH);   // turn the LED on (HIGH is the voltage level)
        delay(1000);                       // wait for a second
        digitalWrite(LED_BUILTIN, LOW);    // turn the LED off by making the voltage LOW
        delay(1000);                       // wait for a second
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      Arduino Uno Blink

      Arduino Uno

      Arduino uno blink


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