Internet of Things: Week 3 – Internet of Things: Week 3 – Internet of Things: Week 3

Project 1 Analog in / Analog Out

Parts for this project:

• Solderless Breadboard
• 8 x Flexible Wire Jumpers
• 1 x RGB LED
• 3 x 220 Ohm Resistors
• 1 x Blue Potentiometer with white knob
• Arduino Duo board
• USB Cable

The Circuit

• Connect 5V and GND to the side strips
• Connect the short leads of the LED to pins 9,10,11 in series with a resistor.

• Connect the Potentiometer across 3 rows
• One side goes to ground.
• The other goes to +5V
• The Center Pin Connects to analog in 0 (Marked A0)

Upload 'RBG_Pot.ino'

The Potentiometer

RGB LED

int val = analogRead(analogPin);    // read the input pin
                    

Upload 'RBG_Pot_Serial.ino'

int LEDGreen=9;
int LEDBlue=10;
int LEDRed=11;

int sensorPin=0;
int val;


void setup(){
  Serial.begin(9600);
}

void loop(){
  
  val=analogRead(sensorPin);
  
  Serial.print("sensor = " );
  Serial.println(val);

  if (val<340) {
    analogWrite(LEDRed,255);
    analogWrite(LEDBlue,0); 
    analogWrite(LEDGreen,0);    
  } else if (val<680) {
    analogWrite(LEDRed,0);
    analogWrite(LEDBlue,255); 
    analogWrite(LEDGreen,0); 
  } else if (val<1024) {
    analogWrite(LEDRed,0);
    analogWrite(LEDBlue,0); 
    analogWrite(LEDGreen,255);  
  }
  delay(10);
}
                
            
                    

Upload 'SerialMath.ino'

int a = 5;
int b = 10;
int c = 20;

void setup()                    // run once, when the sketch starts
{
  Serial.begin(9600);           // set up Serial library at 9600 bps

  Serial.println("Here is some math: ");

  Serial.print("a = ");
  Serial.println(a);
  Serial.print("b = ");
  Serial.println(b);
  Serial.print("c = ");
  Serial.println(c);

  Serial.print("a + b = ");       // add
  Serial.println(a + b);

  Serial.print("a * c = ");       // multiply
  Serial.println(a * c);
  
  Serial.print("c / b = ");       // divide
  Serial.println(c / b);
  
  Serial.print("b - c = ");       // subtract
  Serial.println(b - c);
}

void loop()                     // we need this to be here even though its empty
{
}
                
            
                    

WE can send Serial data as well

Upload PhysicalPixel.ino

const int redPin = 9; // the pin that the LED is attached to
const int bluePin = 10; // the pin that the LED is attached to
const int greenPin = 11; // the pin that the LED is attached to
int incomingByte;      // a variable to read incoming serial data into

void setup() {
  // initialize serial communication:
  Serial.begin(9600);
  // initialize the LED pin as an output:
  pinMode(redPin, OUTPUT);
  pinMode(bluePin, OUTPUT);
  pinMode(greenPin, OUTPUT);
}

void loop() {
  // see if there's incoming serial data:
  if (Serial.available() > 0) {
    // read the oldest byte in the serial buffer:
    incomingByte = Serial.read();
    // if it's a r , turn on the red LED:
    if (incomingByte == 'r') {
      digitalWrite(greenPin, LOW);
      digitalWrite(bluePin, LOW);
      digitalWrite(redPin, HIGH);
    }
    // if it's a g , turn on the green LED:
    if (incomingByte == 'g') {
      digitalWrite(greenPin, HIGH);
      digitalWrite(bluePin, LOW);
      digitalWrite(redPin, LOW);
    }
    / if it's a b , turn on the blue LED:
    if (incomingByte == 'b') {
      digitalWrite(greenPin, LOW);
      digitalWrite(bluePin, HIGH);
      digitalWrite(redPin, LOW);
    }
  }
}

                

RBG Color Mixing

Some Programs to Try:

RainbowRGB.ino

SimpleRGB.ino

RandomRGBFader.ino

Controlling a Servo

Servo_Sweep.ino

#include <servo.h>
Servo myservo; // create servo object to control a servo
// a maximum of eight servo objects can be created
int pos = 0; // variable to store the servo position

void setup() {
myservo.attach(9); // attaches the servo on pin 9 to the servo object }

void loop() {
for(pos = 0; pos < 180; pos += 1) // goes from 0 degrees to 180 degrees
}
{ myservo.write(pos); delay(15);
// in steps of 1 degree
// tell servo to go to position in variable 'pos'
// waits 15ms for the servo to reach the position
}
for(pos = 180; pos>=1; pos-=1) // goes from 180 degrees to 0 degrees 
{
myservo.write(pos); // tell servo to go to position in variable 'pos'
delay(15); // waits 15ms for the servo to reach the position 
}
</servo.h>

Servo With Potentiometer

Upload SERVO_KNOB.INO