Transcript living with the lab - Louisiana Tech University

living with the lab
Using the Arduino to Make an LED Flash
Work in teams of two!
14 digital I/O pins
(I/O = input / output)
USB cable plug
power pins
6 analog input pins
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© 2012 David Hall
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living with the lab
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attending Louisiana Tech University.
The author of this information does not make any claims as to the validity or accuracy of the information
or methods presented.
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living with the lab
The Circuit
digital I/O
pin 0
470W
digital pin 0
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.
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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
}
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how the sketch works
void setup() {
initialize pin 0 as an output
void loop() {
digitalWrite(0, HIGH);
delay(1000);
digitalWrite(0, LOW);
delay(500);
}
set pin 0 to HIGH (5V)
wait 1000 ms
set pin 0 to LOW (0V)
wait 500 ms
1000 ms
voltage (V)
infinite loop
pinMode(0, OUTPUT);
}
500 ms
5V
0V
time (ms)
HIGH = 5V and
LOW = 0V
(Always!!!!)
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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)
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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 
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