// Anemoscope test (for MCP23017)

#include <Adafruit_MCP23X17.h>
#include <LiquidCrystal_I2C.h>

LiquidCrystal_I2C lcd(0x27,16,2);
Adafruit_MCP23X17 mcp;

int dn;
String dir = "N";

void setup() {
  lcd.init(); 
  lcd.backlight();
  lcd.setCursor(0, 0);
  lcd.print("COSMOLIGHT");
  lcd.setCursor(0, 1);
  lcd.print("Project Arduino");

  mcp.begin_I2C(0x20);
  // GPA0~7を入力に設定
  for (int i = 0; i <= 7; i++) {
    mcp.pinMode(i, INPUT);
  }
  delay(3000);
}

void loop(){
  dn = -1;
  //GPA0～7のデータを取得
  for (int i = 0; i <= 7; i++) {
    if (mcp.digitalRead(i) == LOW) {
      dn = i;
      break;    
    }
  }
  switch (dn) {
    case 0:
      dir = "N";
      break;
    case 1:
      dir = "NE";   
      break;
    case 2:
      dir = "E";   
      break;
    case 3:
      dir = "SE";   
      break;
    case 4:
      dir = "S";   
      break;
    case 5:
      dir = "SW";   
      break;
    case 6:
      dir = "W";   
      break;
    case 7:
      dir = "NW";   
      break;
  }

  // data ---> LCD
  lcd.clear();
  lcd.setCursor(0, 0);
  lcd.print("Wind direction:");
  lcd.setCursor(0, 1);
  lcd.print(dir);  
  delay(1000);
}