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Take a look at the comments (the text after the “//” symbols) above each command. See if you can start to spot patterns in the code. A great way to write your own code is to copy and paste sections of your already existing code and modify the copied code to fit your new project. NOTE: An external LED needs a resistor in the circuit to keep it from burning out. The higher the resistance, the dimmer the LED will appear but the longer it will last. NOTE: Make sure the long lead on the LED is connected to positive (pin 13 in this case); LEDs are directional and won’t work if these connections are reversed.
1 220 Ohm Resistor 1 Arduino UNO R3 1 Breadboard Connector Wires
Code:
//------------- Code Starts Here ---------------------------- //----------------------------------------- //Published by IntroductionToArduino.com //Created by Paul Illsley (www.paulillsley.com) //Please use and share so others can enjoy //----------------------------------------- void setup() { // setting pin 13 (the LED) as an output (this is also the pin for the UNO's on-board LED). pinMode(13,OUTPUT); } void loop() { // setting the voltage of pin 13 to HIGH (5 volts), the LED turns on digitalWrite(13,HIGH); // delay 1000 milliseconds (1 second) delay(1000); // setting the voltage of pin 13 to LOW (0 volts), the LED turns off digitalWrite(13,LOW); // delay 1000 milliseconds (1 second) delay(1000); } //------------- Code Stops Here ----------------------------
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