NKC Electronics

/*
  NKC Electronics serial display - Custom Characters
 
 Demonstrates how to add custom characters on an LCD  display. 
 This sketch prints "I <heart> Arduino!" and a little dancing man
 to the LCD.
 
  The circuit:
 * LCD SCL (pin 7 or pin 3 on J2) pin to Arduino SCL pin or Analog 5
 * LCD SDA (pin 8 or pin 4 on J2) pin to Arduino SDA pin or Analog 4
 * LCD VSS (pin 9 or pin 5 on J2) pin to GND
 * LCD VDD (pin 10 or pin 6 on J2) pin to +5V
 
 Based on the original CustomCharacter example from Arduino
 */
 
#include <Wire.h>
 
char ESC = 0xFE;  // escape character to send commands to LCD
char addr = 0x28; // default i2c address

// make some custom characters:
byte heart[8] = {
  0b00000,
  0b01010,
  0b11111,
  0b11111,
  0b11111,
  0b01110,
  0b00100,
  0b00000
};

byte smiley[8] = {
  0b00000,
  0b00000,
  0b01010,
  0b00000,
  0b00000,
  0b10001,
  0b01110,
  0b00000
};

byte frownie[8] = {
  0b00000,
  0b00000,
  0b01010,
  0b00000,
  0b00000,
  0b00000,
  0b01110,
  0b10001
};

byte armsDown[8] = {
  0b00100,
  0b01010,
  0b00100,
  0b00100,
  0b01110,
  0b10101,
  0b00100,
  0b01010
};

byte armsUp[8] = {
  0b00100,
  0b01010,
  0b00100,
  0b10101,
  0b01110,
  0b00100,
  0b00100,
  0b01010
};

void setup() {
  Wire.begin();
 
  // create a new character
  createChar(0, heart);
  // create a new character
  createChar(1, smiley);
  // create a new character
  createChar(2, frownie);
  // create a new character
  createChar(3, armsDown); 
  // create a new character
  createChar(4, armsUp); 
 
  // Initialize LCD module
  // Display On 
  Wire.beginTransmission(addr);
  Wire.write(ESC);
  Wire.write(0x41);
  // Clear Screen
  Wire.write(ESC);
  Wire.write(0x51);
  // Set Contrast
  Wire.write(ESC);
  Wire.write(0x52);
  Wire.write(40);
  // Set Backlight
  Wire.write(ESC);
  Wire.write(0x53);
  Wire.write(8);

  // Write some text to the display
  Wire.write("I ");
  Wire.write((byte)0);
  Wire.write(" Arduino! ");
  Wire.write(1);
  Wire.endTransmission();
}

void loop() {
  // read the potentiometer on A0:
  int sensorReading = analogRead(A0);
  // map the result to 200 - 1000:
  int delayTime = map(sensorReading, 0, 1023, 200, 1000);
  // set the cursor to the bottom row, 5th position:
  Wire.beginTransmission(addr);
  Wire.write(ESC);
  Wire.write(0x45);
  Wire.write(0x44);
  // draw the little man, arms down:
  Wire.write(3);
  Wire.endTransmission();
  delay(delayTime);
  Wire.beginTransmission(addr);
  Wire.write(ESC);
  Wire.write(0x45);
  Wire.write(0x44);
  // draw him arms up:
  Wire.write(4);
  Wire.endTransmission();
  delay(delayTime);
}

void createChar(byte c, byte *d)
{ 
  Wire.beginTransmission(addr);
  Wire.write(ESC);
  Wire.write(0x54);
  Wire.write(c);
  Wire.write(d, 8);
  Wire.endTransmission();
}