Jeremy Blum Projects - Arduino Parte [4]

Esta semana é sobre todas as entradas analógicas para o Arduino. Jeremy irá te mostrar como você pode usar um circuito divisor de tensão (visto no episódio 3) e um resistor variável para fazer um sensor analógico. Também vamos usar um sensor infravermelho Sharp distância como uma entrada analógica para detectar a distância e movimento (com alguma programação inteligente). Até o final deste episódio, você será capaz de criar seu próprio sistema de iluminação de emergência! Sem mais delongas, confira esta semana tutorial sobre entradas analógicas para o arduino ...]




























//Program by Jeremy Blum
//www.jeremyblum.com
//This will turn on an LED after a threshold
int sensePin = 0;
int ledPin = 9;
void setup()
{
  //Note: We don't need to specifiy sensePin as an
  //input, since it defaults to that when we read it

  //The LED pin needs to be set as an output
  pinMode(ledPin, OUTPUT);
  //This is the default value, but we can set it anyways
  analogReference(DEFAULT); //5V Reference on UNO
 
}
void loop()
{
  // read the sensor
  int val = analogRead(sensePin);
 
  if(val < 800)
  {
    digitalWrite(ledPin, HIGH);
  }
  else
  {
    digitalWrite(ledPin, LOW);
  }
}

---------------------------------------------

//Program by Jeremy Blum
//www.jeremyblum.com
//This will turn on an LED after a threshold
int sensePin = 0;
int ledPin = 9;
void setup()
{
  //Note: We don't need to specifiy sensePin as an
  //input, since it defaults to that when we read it
  //The LED pin needs to be set as an output
  pinMode(ledPin, OUTPUT);
  //This is the default value, but we can set it anyways
  analogReference(DEFAULT); //5V Reference on UNO
 
}
void loop()
{
  // read the sensor
  int val = analogRead(sensePin);
 
  if(val < 800)
  {
    digitalWrite(ledPin, HIGH);
  }
  else
  {
    digitalWrite(ledPin, LOW);
  }
}

------------------------------------

//Program by Jeremy Blum
//www.jeremyblum.com
//Turn on an LED if a room is dim, and motion is detected
//Define Pins
int motionPin = 0;
int lightPin = 1;
int ledPin = 9;
//Distance Variables
int lastDist = 0;
int currentDist = 0;
//Threshold for Movement
int thresh = 200;
void setup()
{
  //The LED pin needs to be set as an output
  pinMode(ledPin, OUTPUT);
}
void loop()
{
  // read the sensor
  int lightVal = analogRead(lightPin);
  currentDist = analogRead(motionPin);
  //Does the current distance deviate from the last distance by more than the threshold?
  if ((currentDist > lastDist + thresh || currentDist < lastDist - thresh) && lightVal < 800)
  {
    digitalWrite(ledPin, HIGH);
    delay(1000);
  }
  else
  {
    digitalWrite(ledPin, LOW);
  }
  lastDist = currentDist;
}

---------------------------------------------

//Program by Jeremy Blum
//www.jeremyblum.com
//Reads and analog sensor and displays the value
int sensePin = 0;
void setup()
{
  //Note: We don't need to specifiy sensePin as an
  //input, since it defaults to that when we read it
  //This is the default value, but we can set it anyways
  analogReference(DEFAULT); //5V Reference on UNO
  //Allows us to listen to serial communications from the arduino
  Serial.begin(9600);
}
void loop()
{
  // print the button state to a serial terminal
  Serial.println(analogRead(sensePin));
  delay(500);
  //wait half a second, then print again.
}