Using the Arduino to Make an LED Flash Work in teams of two! living with the lab digital I/O pins (I/O = input / output) USB cable plug power pins 6 analog input pins © 2012 David Hall

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The Circuit 470  digital I/O pin 0 living with the lab 3 NOTE: It would probably be better to use a different pin than digital pin 0 since this pin receives information from your computer through the USB cable. The RX printed beside pin 0 and the TX printed beside pin 1 mean “receive” and “transmit,” respectively. digital pin 0

enter and run the following sketch Enter and run the following sketch: void setup() { // initialize the digital pin as an output: pinMode(0, OUTPUT); } void loop() { digitalWrite(0, HIGH); // set the LED on delay(1000); // wait for a second digitalWrite(0, LOW); // set the LED off delay(500); // wait for 500 ms } living with the lab 4

how the sketch works HIGH = 5V and LOW = 0V (Always!!!!) void setup() { pinMode(0, OUTPUT); } void loop() { digitalWrite(0, HIGH); delay(1000); digitalWrite(0, LOW); delay(500); } initialize pin 0 as an output infinite loop set pin 0 to LOW (0V) wait 500 ms set pin 0 to HIGH (5V) wait 1000 ms time (ms) voltage (V) 0V 5V 500 ms1000 ms living with the lab 5

Now Experiment on Your Own! (1)Try changing the time to 1.5 seconds on and 1 second off (2)Connect the resistor to digital pin 5 and change the program to match (3)Blink out SOS in Morse code (dot-dot-dot-dash-dash-dash-dot-dot-dot) a.three short pulses (0.25 seconds each) followed by... b.three long pulses (0.75 second each) followed by... c.three short pulses (0.25 seconds each) followed by... d.a brief pause (1 second) e.repeat a through d using an infinite loop Show your instructor when you have completed exercise (3) living with the lab 6

Find each command in the reference section of arduino.cc (discuss each command with others at your table) void setup() { // initialize the digital pin as an output: pinMode(0, OUTPUT); } void loop() { digitalWrite(0, HIGH); // set the LED on delay(1000); // wait for a second digitalWrite(0, LOW); // set the LED off delay(500); // wait for 500 ms } The End living with the lab 7