MLX90614_LCD.ino

// MLX90614の実験
// 2017/01/28 edy
// 2017/01/29 8x2行LCDを追加
//http://mag.switch-science.com/2014/11/05/i2c_lcd_breakout_int/

/***************************************************
  This is a library example for the MLX90614 Temp Sensor

  Designed specifically to work with the MLX90614 sensors in the
  adafruit shop
  ----> https://www.adafruit.com/products/1748
  ----> https://www.adafruit.com/products/1749

  These sensors use I2C to communicate, 2 pins are required to
  interface
  Adafruit invests time and resources providing this open source code,
  please support Adafruit and open-source hardware by purchasing
  products from Adafruit!

  Written by Limor Fried/Ladyada for Adafruit Industries.
  BSD license, all text above must be included in any redistribution
 ****************************************************/


#include<Wire.h>
#include <Adafruit_MLX90614.h>

Adafruit_MLX90614 mlx = Adafruit_MLX90614();

#define LCDAdr 0x3e
byte contrast = 30;  // コントラスト(0～63)

void setup()
{
  Wire.begin();

  mlx.begin();

  Serial.begin(9600);

  lcd_cmd(0b00111000); // function set
  lcd_cmd(0b00111001); // function set
  lcd_cmd(0b00000100); // EntryModeSet
  lcd_cmd(0b00010100); // interval osc
  lcd_cmd(0b01110000 | (contrast & 0xF)); // contrast Low
  lcd_cmd(0b01011100 | ((contrast >> 4) & 0x3)); // contast High/icon/power
  lcd_cmd(0b01101100); // follower control
  delay(200);
  lcd_cmd(0b00111000); // function set
  lcd_cmd(0b00001100); // Display On
  lcd_cmd(0b00000001); // Clear Display
  //delay(100);
}

void loop()
{
  float objTemp = mlx.readObjectTempC();
  float dieTemp = mlx.readAmbientTempC();

  Serial.print(objTemp);
  Serial.print(",");
  Serial.println(dieTemp);

  lcd_clear();
  lcd_setCursor(0, 0);
  lcd_printFloat(objTemp, 5, 1);
  lcd_setCursor(0, 1);
  lcd_printFloat(dieTemp, 5, 1);

  delay(500);
}

void lcd_cmd(byte x) {
  Wire.beginTransmission(LCDAdr);
  Wire.write(0b00000000); // CO = 0,RS = 0
  Wire.write(x);
  Wire.endTransmission();
}

void lcd_clear()
{
  lcd_cmd(0b00000001);
}

void lcd_contdata(byte x) {
  Wire.write(0b11000000); // CO = 1, RS = 1
  Wire.write(x);
}

void lcd_lastdata(byte x) {
  Wire.write(0b01000000); // CO = 0, RS = 1
  Wire.write(x);
}

// 文字の表示
void lcd_printStr(const char *s) {
  Wire.beginTransmission(LCDAdr);
  while (*s) {
    if (*(s + 1)) {
      lcd_contdata(*s);
    } else {
      lcd_lastdata(*s);
    }
    s++;
  }
  Wire.endTransmission();
}

// 表示位置の指定
void lcd_setCursor(byte x, byte y) {
  lcd_cmd(0x80 | (y * 0x40 + x));
}

void lcd_printInt(int num)
{
  char int2str[10];
  sprintf(int2str, "%d", num);
  lcd_printStr(int2str);
}

//浮動小数点を文字列に変換して表示
//http://garretlab.web.fc2.com/arduino/reverse_lookup/index.html#string-float_to_string
void lcd_printFloat(float num, int width, int prec)
{
  char float2str[10];
  dtostrf(num, width, prec, float2str);
  lcd_printStr(float2str);
}