Virtual Pet

v_pet.ino

/* The circuit:
 * LCD RS pin to digital pin 12
 * LCD Enable pin to digital pin 11
 * LCD D4 pin to digital pin 5
 * LCD D5 pin to digital pin 4
 * LCD D6 pin to digital pin 3
 * LCD D7 pin to digital pin 2
 * LCD R/W pin to ground
 * LCD VSS pin to ground
 * LCD VCC pin to 5V
 * 10K resistor:
 * ends to +5V and ground
 * wiper to LCD VO pin (pin 3)
 */

// include the library code:
#include <LiquidCrystal.h>

// light
const int ledPin = 13;

// piezo sensor on Analog pin 0
const int knockSensor = A1;

// is the knock strong enough ?
const int threshold = 400;

// changing variables:
int knockReads = 0;
int ledState = LOW;
int counter = 0;

// initialize the library with the numbers of the interface pins
LiquidCrystal lcd(12, 11, 5, 4, 3, 2);

byte customChar1[8] = {
  0b01110,
  0b10011,
  0b10011,
  0b11111,
  0b01110,
  0b00000,
  0b00000,
  0b00000
};
byte customChar2[8] = {
  0b00000,
  0b00000,
  0b00000,
  0b00000,
  0b00000,
  0b00000,
  0b10001,
  0b01110
};

byte customChar3[8] = {
  0b00000,
  0b00000,
  0b01110,
  0b01010,
  0b01110,
  0b00000,
  0b00000,
  0b00000
};

byte customChar4[8] = {
  0b00011,
  0b00011,
  0b00000,
  0b00000,
  0b00000,
  0b00000,
  0b00000,
  0b00000
};

byte customChar5[8] = {
  0b00100,
  0b01010,
  0b01010,
  0b10001,
  0b10001,
  0b01010,
  0b01010,
  0b00100
};

byte customChar6[8] = {
  0b00001,
  0b00001,
  0b00010,
  0b00010,
  0b00100,
  0b01100,
  0b11000,
  0b00000
};

void setup() {
  lcd.createChar(0, customChar1);
  lcd.createChar(1, customChar2);
  lcd.createChar(3, customChar3);
  lcd.createChar(4, customChar4);
  lcd.createChar(5, customChar5);
  lcd.createChar(6, customChar6);

  lcd.begin(16, 2);
  lcd.setCursor(16, 0);

  lcd.print("(");
  lcd.print("L");
  lcd.print((char)0);
  lcd.print((char)1);
  lcd.print((char)0);
  lcd.print(" )");
  lcd.print("L");
  lcd.print((char)3);
  lcd.print("*:");
  lcd.print((char)3);
  lcd.print((char)4);
  lcd.print((char)5);

  lcd.setCursor(0, 1);
  lcd.print (counter);

  pinMode(ledPin, OUTPUT);
  Serial.begin(9600);
}

void loop() {

  knockReads = analogRead(knockSensor);
  Serial.println(knockReads);

  if (knockReads >= threshold) {

    // pet dances!
    lcd.print("(");
    lcd.print((char)6);
    lcd.print((char)0);
    lcd.print((char)1);
    lcd.print((char)0);
    lcd.print(" )");
    lcd.print((char)6);
    lcd.print((char)3);
    lcd.print("*:");
    lcd.print((char)3);
    lcd.print((char)4);
    lcd.print((char)5);

    // update the LED pin itself:
    digitalWrite(ledPin, ledState);

    // count the knocks
    counter++;

    // if knocked, turn light on
    ledState = HIGH;
    Serial.println("Knock!");

    // reset threshold
    knockReads = 0;
    ledState = LOW;
    
    Serial.println(counter);

  }

  delay(1000);
}