last saturday[12XII] exercises

this time no schemes! just explanation what and where. you schould be able to find all the necessary info int the net. check fritzing examples as well.
only thing you need to do is to load a servo library in the beginning of all four codes below
you go to sketch/import library/servo.

piezo triggers servo movement 004

//servo attached to pin 2 + piezo on analog pin 0 [needs amplifier, check here]
//load servo library!

Servo myServo;
const int threshold=200;//how hard do you need to knock?
int piezoRead;

void setup(){
myServo.attach(2);
}

void loop(){

piezoRead=analogRead(0);

if (piezoRead>threshold){//if the signal from piezo is strong enough, then...

for (int i=0; i<180;i+=1){ //turn the servo
myServo.write(i);
delay(10);
}

myServo.write(0);//and go back
delay(500);

}
}

servo and photocell 003

//hook up a servo to pin2 and a photocell[stabilize it with resistor] to analog pin 0
//load servo library!

Servo myServo;
int photoCellValue;
int mappedValue;

void setup(){
myServo.attach(2);
}

void loop(){

photoCellValue=analogRead(0);//reads value from the photocell
mappedValue=map(photoCellValue,0,1024,1,180);//check in the help, very usefull

myServo.write(mappedValue);
delay(5);

}

different speeds servo 002

//similar as below, only little change introduced in the loop
//load servo library!

Servo myServo;

void setup(){
myServo.attach(2);
}

void loop(){

for (int i=0; i<180;i+=1){ //repeats commands inbetween braces 180 times
myServo.write(i);//angle is a variable now
delay(10);
}

myServo.write(0);//go back
delay(500);
}

simple servo control codes [last saturday] 001

//for this code you'll need a servo conected to PIN2

//remember to load a library for servo control!

Servo myServo;//creates servo object to play with

void setup(){
myServo.attach(2);//defines where the servo is attached
}

void loop(){//repeats that:

myServo.write(0);//turns the servo to its 0 positioon
delay(500);//waits 500 ms
myServo.write(180);//turns the servo 180 degrees
delay(500);//waits again
}

Particles+Arduino

//to fully use this sketch, you need to upload SimpleDigitalFirmata to your Arduino, and hook up switches to PINs 2 and 3, and LED to PIN 4
import processing.opengl.*;
import cc.arduino.*;
import processing.serial.*;

Arduino myArduino;

Particles[] particles;
int amount=15000;
float angle=0;

void setup(){
size(800,600,OPENGL);
noStroke();
println(Arduino.list());//this will list all availible COM ports
myArduino = new Arduino(this, Arduino.list()[0], 57600);
myArduino.pinMode(4,Arduino.OUTPUT);

particles=new Particles[amount];//declare na array
for (int i=0; i
particles[i]=new Particles(0,0,0,random(1,5),random(1,5),color(random(0,255),random(0,20),random(0,255)));//create objects of a class "Particles", each with specific properties
}
}
void draw(){
angle+=0.01;//update angle
background(100);
translate(width/2,height/2,0);
scale(2);//"zoom out"
rotateY(angle);//rotate around Y axis
myArduino.digitalWrite(4,Arduino.LOW);
for (int i=0; i
particles[i].behave();
particles[i].display();
particles[i].trigger();
}
}

class Particles// a class contains functions and properties shared by the objects derived from it
{
//first:global variables
float xPos,yPos,zPos;
float step,dimension;
color cc;

Particles(float sX,float sY,float sZ,float dim, float speed, color c){//constructor-this is called when we create new objects in the setup
//variables different for each objects
xPos=sX;
yPos=sY;
zPos=sY;
step=speed;
dimension=dim;
cc=c;
}

void behave(){
if (myArduino.digitalRead(2)==Arduino.HIGH){//move slower if button 1 is pressed
xPos+=random(-step*0.3,step*0.3);
yPos+=random(-step*0.3,step*0.3);
zPos+=random(-step*0.3,step*0.3);
}
if (myArduino.digitalRead(3)==Arduino.HIGH){//move faster if button 2 is pressed
xPos+=random(-step*2,step*2);
yPos+=random(-step*2,step*2);
zPos+=random(-step*2,step*2);
}
if(keyPressed){//move if any key is pressed
xPos+=random(-step,step);
yPos+=random(-step,step);
zPos+=random(-step,step);
}

}

void display(){
stroke(cc);

strokeWeight(dimension);

point(xPos,yPos,zPos);
}
void trigger(){
strokeWeight(10);
stroke(255,150,0);
point(50,50,50);
if(dist(xPos,yPos,zPos,50,50,50)<5){//whenever a particle passes close to point (50,50,50), turn on the LED
myArduino.digitalWrite(4,Arduino.HIGH);
}

}

}

Digital input

update 7.11 2100

most of problems today were caused by trying to read a wrong [not active] COM port from processing. in 005_analogRead update there are lines highlighted and commented. that should help.

005 analogRead circles [processing] update

import cc.arduino.*;//import libraries to comunicate with arduino thru serial port
import processing.serial.*;

Arduino myArduino;//declare myArduino as a name for your board

float value;//declare a variable to store input data

void setup() {//exactly the same as in arduino platform
size(600,600);//screen size
println(Arduino.list());//this will list all availible COM ports
myArduino = new Arduino(this, Arduino.list()[0], 57600); //instead of 0 put one you use
background(100);//background colour
smooth();//smooth edges
}

void draw(){//the same as loop in arduino software (code repeats endlessly)
fill(100,10);
noStroke();
rect(0,0,width,height);
value=5*(myArduino.analogRead(0));//that's how we get input from arduino now
stroke(255,100,100);
strokeWeight(3);
noFill();
ellipse(mouseX,mouseY,value,value);//draw a circle using value as a radius
}

004 beep frequency [arduino]

int value;
void setup(){
pinMode(2,OUTPUT);
}
void loop(){
value=analogRead(0);
digitalWrite(2,HIGH);
delayMicroseconds(value);//we are using smaller delay intervals [microseconds], to cause vibration fast enough to be heard.
digitalWrite(2,LOW);
delayMicroseconds(value);

}

003 blink frequency [arduino]

int value;//we declare a variable. we will use this to store input from analog IN
void setup(){
pinMode(2,OUTPUT);
}
void loop(){
value=analogRead(0);//input from analog PIN 0 is assigned to the variable
digitalWrite(2,HIGH);
delay(value);//we can use the above variable to change delay value dynamically. value read by analog PIN is between 0 and 1024.
digitalWrite(2,LOW);
delay(value);
}

002 blink on/off [arduino]

void setup(){
pinMode(2,OUTPUT);//PIN 2 is output
pinMode(3,INPUT);//PIN 3 is input
digitalWrite(2,LOW);//just to make sure: turn PIN 2 in the begining
}
void loop(){

if(digitalRead(3)==HIGH){//if current flows thru PIN 3 do this:

digitalWrite(2,HIGH);
delay(100);
digitalWrite(2,LOW);
delay(100);

}

}

001 blink [arduino]

void setup(){//this part of code runs only once in the begining.here we setup the system.
pinMode(2,OUTPUT);//we setup PIN 2 as output
}
void loop(){//this sequence will cause blinking.
digitalWrite(2,HIGH);//send +5V to PIN 2
delay(100);//wait for 100 miliseconds
digitalWrite(2,LOW);//turn PIN 2 off
delay(100);//wait for 100 miliseconds

}