Week 8 - Journal

Represent distance by colors

1. If the object is 20 cm away or less the RGB LED goes RED

2. If the object is more than 20 cm away, the RGB goes Green

3. GUI that contains ( button & label)

if the user presses the "ShowDistance" button, the distance that the sensor measures shown on the screen.

A) Wiring

1- Attach RGB LED on Breadboard

2- Wire the RGB with the Arduino using 220 ohm resistors

• RED >> pin 11

• BLUE >> pin 10

• Green >> pin 9

• Cathode >> GND

3- Wire the ultrasonic sesnor

• Trigger >> pin 13

• Echo >> pin 12

• VCC >> 5V

• GND >> GND

4- Attach the Arduino GND to the -ve of the breadboard

5- Attach the Arduino 5V to the +ve of the breadboard

B) Coding

• Arduino

1- Edit Arduino code to print the distance if the button is pressed

• processing button sends "1" to arduino

• Then Arduino sends the distance value

inData is a char variable that stores the value that comes from processing

• Processing

1- Import controlp5 library and processing.serial

2- define objects myport, cp5,label

3- initialize string x to 0

4- in Setup: make the background color black, size 400*400 pixels, no stroke.

5- In Setup: set the button parameters

name; ShowDistance

position: (100,100)

size: 200*19

6- In Setup: set the label parameters

name; Distance is

position: (100,50)

Color: yellow (0xffffff00)

Font: Georgia

size: 20

7- In Setup: set the port to make the serial communication between Arduino and processing

8- In Draw: if the communication is available, read the distance value from Arduino

9- print on screen "Distance is + (distance value)"

10- make the background black again to remove the old distance

11- Write to Arduino "1" if the button is pressed by ShowDistance function

Schematic Diagram