Some arduino experiments

1. What is Arduino
• A microcontroller board, contains on-board
power supply, usb port to communicate with
pc and an Atmel microcontroller chip.
• It simplify the proces of creating any control
system by providing the standard board that
can be programmed and connected to the
system without the need to any sophisticated
PCB design.
• An OPEN-SOURCE hardware.

2. Some Arduino boards

4. Arduino philosophy is to learn by practicing so…
Let’s do what Arduino wants…

5. Ultrasonic sensor
It is a sensor that work on a principle similar
to radar, which evaulate attributes of a target
by interpreting the echoes from radio or
sound waves respectively.

7. A simple circuit using this sensor…

8. Using the code below we can read from Arduino
the distance of different objects
• int echo=9;
• int trig= 10;
• int distance;

9. void setup()
• {
• Serial.begin (9600);
• pinMode (echo,INPUT);
• pinMode (trig, OUTPUT);
• }

10. void loop ()
• {
• digitalWrite (trig, LOW);
• delay (2);
• digitalWrite (trig, HIGH);
• delay (2);
• digitalWrite (trig, LOW);
• distance=pulseIn (echo,HIGH);
• distance=distance/58;
•
• Serial.println(distance);
• }

11. Now that we all know how ultrasonic sensor
works, let’s add a buzzer and modify the code

12. • int echo=9;
• int trig= 10;
• int distance;
• int buzz= 8;

13. void setup ()
• {
• Serial.begin (9600);
• pinMode (echo,INPUT);
• pinMode (trig, OUTPUT);
• pinMode ( buzz, OUTPUT);
• }

14. Void loop ()
• void loop ()
• {
• digitalWrite (trig, LOW);
• delay (2);
• digitalWrite (trig, HIGH);
• delay (2);
• digitalWrite (trig, LOW);
• distance=pulseIn (echo,HIGH);
• distance=distance/58;
• if (distance < 7)
•

15. • digitalWrite (buzz, HIGH);
• else
• digitalWrite (buzz, LOW );
•
• Serial.println(distance);
• }

16. Let’s try something else that is called :
Double – Touch Sensor.

18. You know what comes next:
The Code…
• #include <CapacitiveSensor.h>
• CapacitiveSensor capSensor =
CapacitiveSensor(4,2);
• boolean ledstate=LOW;
• int sensorValue;
• int sensor;
• const int ledPin = 8;

19. • void setup() {
• Serial.begin(9600);
• pinMode(ledPin, OUTPUT);
• }
• void loop() {
• sensorValue = capSensor.capacitiveSensor(30);
• if(sensorValue > 0) {
• ledstate =!ledstate;
• }
• Serial.println(sensorValue);
•
• digitalWrite(ledPin,ledstate);
• delay(500);
• }

20. And for desert…
Let’s transform all this to an alarm system
using: Arduino, an ultrasonic sensor, a buzzer
and a rgb led.

22. • #define TRIGPIN 10
• #define ECHOPIN 9
• int buzz=8;
• int red=7,green=6,blue=5;

23. void setup ()
• {
• Serial.begin(9600);
• pinMode(ECHOPIN,INPUT);
• pinMode(TRIGPIN,OUTPUT);
• pinMode (buzz,OUTPUT);
• pinMode (red,OUTPUT);
• pinMode (green,OUTPUT);
• pinMode (blue, OUTPUT);
• }

24. void loop ()
• {
• digitalWrite (buzz,LOW);
• digitalWrite (red,LOW);
• digitalWrite (green,LOW);
• digitalWrite (blue,LOW);
• digitalWrite(TRIGPIN,LOW);
• delayMicroseconds(2);
• digitalWrite(TRIGPIN,HIGH);
• delayMicroseconds(2);
• digitalWrite(TRIGPIN,LOW);

25. • int distance=pulseIn(ECHOPIN,HIGH);
• distance=distance/58;
• if (distance>20)
• { digitalWrite (green,HIGH);
• digitalWrite (buzz,LOW);
• }
• else if (distance>10 && distance<20)
• {
• digitalWrite (green, LOW);
• digitalWrite ( blue,HIGH);
• digitalWrite (buzz,LOW);
• }

26. • else if ( distance>0 && distance <10 )
• {
• digitalWrite (green, LOW);
• digitalWrite (blue,LOW);
• digitalWrite (red, HIGH);
• digitalWrite (buzz,HIGH);
• }
•
• Serial.println (distance);
• delay(100);
• }