1. INC 161 , CPE 100 Computer Programming
Lab 12

2. PC Interface with the World
Command

3. Arduino Embedded computer (small computer) designed for easy to use
Based on C language
More details at

4. Our board Arduino Duemilanove Based on CPU Atmega328
Powered by Plug-in USB

5. Software
Download at

6. Structure of Arduino Program
void setup() {
// Commands here will run only once }
void loop()
// Commands here will run repeatedly

7. Digital Output The board pins can be programmed to give out
0 or 1 logic.
0 = 0 volts
1 = 5 volts
Setup
pinMode(pin,mode) - Use to set mode OUTPUT
Loop
digitalWrite(pin,value) - Use to set the voltage

8. Practice Board LED Connected to D6 – D13 Switch
connected to D2 D3 D14 D15

9. Digital Output Example 1
void setup() {
pinMode(6, OUTPUT); }
void loop()
digitalWrite(6, HIGH);
How can you set the light to on and off?

10. Delay Because the board can compute quite fast,
we need to add a delay.
Function
delay(n_millisec)
will pause for n milliseconds
(n is the input of the function)

11. Digital Output Example 2
void setup() {
pinMode(6, OUTPUT); }
void loop()
digitalWrite(6, HIGH);
delay(1000);
digitalWrite(6, LOW);

12. Task 1
Write a program of running lights from left to right continuously.

13. Serial Output The board can communicate messages via serial port.
Use serial monitor to view the output.
Setup
Serial.begin(9600) - Initialize serial port
with speed 9600 bps
(default)
Loop
Serial.print(arg)
Serial.println(arg) Use to print

14. Serial Output Example 3 int a = 0; void setup() { Serial.begin(9600);}
void loop()
Serial.print(“Value = “);
Serial.println(a);
delay(1000);
a++;

15. Digital Input The board can read the value of switch. Setup
pinMode(pin,mode) - Use to set mode INPUT_PULLUP
Loop
digitalRead(pin) - Function returns the value read
from pin

16. Digital Input Example 4 int a; void setup() { Serial.begin(9600);
pinMode(2, INPUT_PULLUP); }
void loop()
a = digitalRead(2);
Serial.println(a);
delay(100);