Example code for blinking LED

example.code

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+/*
+  Blink
+
+  Turns an LED on for one second, then off for one second, repeatedly.
+
+  Most Arduinos have an on-board LED you can control. On the UNO, MEGA and ZERO
+  it is attached to digital pin 13, on MKR1000 on pin 6. LED_BUILTIN is set to
+  the correct LED pin independent of which board is used.
+  If you want to know what pin the on-board LED is connected to on your Arduino
+  model, check the Technical Specs of your board at:
+  https://www.arduino.cc/en/Main/Products
+
+  modified 8 May 2014
+  by Scott Fitzgerald
+  modified 2 Sep 2016
+  by Arturo Guadalupi
+  modified 8 Sep 2016
+  by Colby Newman
+  modified 30 Sep 2023
+  by Axel Sepulveda
+  This example code is in the public domain.
+
+  https://www.arduino.cc/en/Tutorial/BuiltInExamples/Blink
+*/
+
+// For SAM4E testing we defined pin 20 = PD0 and pin 21 = PA17
+
+int ledPin0 = 20 ; 
+int ledPin1 = 21 ; 
+//int ledPin = LED_BUILTIN ; 
+// the setup function runs once when you press reset or power the board
+void setup() {
+  // initialize digital pin LED_BUILTIN as an output.
+  pinMode(ledPin0, OUTPUT);
+  pinMode(ledPin1, OUTPUT);
+}
+
+// the loop function runs over and over again forever
+void loop() {
+  digitalWrite(ledPin0, HIGH);  // turn the LED on (HIGH is the voltage level)
+  digitalWrite(ledPin1, HIGH);  // turn the LED on (HIGH is the voltage level)
+  delay(1000);                      // wait for a second
+  digitalWrite(ledPin0, LOW);   // turn the LED off by making the voltage LOW
+  digitalWrite(ledPin1, LOW);  // turn the LED on (HIGH is the voltage level)
+  delay(1000);                      // wait for a second
+}