commit 07c6cc0cb93a6d93825271424ead83eac17283cd
Author: Dimitar Byalkov <CapitalRhino@users.noreply.github.com>
Date:   Tue Apr 13 12:27:39 2021 +0300

    Initial commit

diff --git a/meteo.ino b/meteo.ino
new file mode 100644
index 0000000..5cad0ba
--- /dev/null
+++ b/meteo.ino
@@ -0,0 +1,356 @@
+#include <Adafruit_CCS811.h>
+
+#include <LiquidCrystal.h>
+
+#include <Adafruit_HTU21DF.h>
+
+int lcd_key = 0;
+int adc_key_in = 0;
+
+float tempUpHold = 20.5;
+float tempDownHold = -10.5;
+float humiUpHold = 95.0;
+float humiDownHold = 10.0;
+int gasTreshold = 800;
+
+#define btnRIGHT 0
+#define btnUP 1
+#define btnDOWN 2
+#define btnLEFT 3
+#define btnSELECT 4
+#define btnNONE 5
+
+LiquidCrystal lcd(8, 9, 4, 5, 6, 7); // lcd init
+Adafruit_HTU21DF htu = Adafruit_HTU21DF(); // htu21d init
+Adafruit_CCS811 ccs; // ccs811 init
+
+// button handle method
+int read_LCD_buttons() {
+  adc_key_in = analogRead(0); // read value from the sensor 
+  // threshold manually adjusted
+  if (adc_key_in > 1000) return btnNONE;
+  if (adc_key_in < 50) return btnRIGHT;
+  if (adc_key_in < 250) return btnUP;
+  if (adc_key_in < 300) return btnDOWN;
+  if (adc_key_in < 500) return btnLEFT;
+  if (adc_key_in < 850) return btnSELECT;
+  return btnNONE;
+}
+
+void setup() {
+  Serial.begin(9600);
+  if (!ccs.begin()) {
+    while (1);
+  }
+
+  // gas sensor init
+  while (!ccs.available());
+  ccs.begin();
+
+  // htu init
+  htu.begin();
+
+  // lcd init (16x2)
+  lcd.begin(16, 2);
+
+  // splash screen
+  lcd.print(" METEO  STATION ");
+  lcd.setCursor(0, 1);
+  lcd.print(" v0.0.4 Welcome ");
+  delay(2000);
+  lcd.clear();
+  Serial.println("Ready");
+}
+
+int selectedMenu = 0;
+bool selectedOption = false; // because the display is only 16x2 I can get away
+// with using just a bool variable
+bool splashShown = false;
+bool clearScreen = false;
+bool exitSettings = false;
+
+void readButtons() {
+  lcd_key = read_LCD_buttons(); // read the buttons
+  switch (lcd_key) { // depending on which button was pushed, we perform an action
+  case btnRIGHT: {
+    switch (selectedMenu) {
+    case 0: {
+      break;
+    }
+    case 1: {
+      if (selectedOption) {
+        tempDownHold += 0.5;
+      } else {
+        tempUpHold += 0.5;
+      }
+      break;
+    }
+    case 2: {
+      if (selectedOption) {
+        humiDownHold += 0.5;
+      } else {
+        humiUpHold += 0.5;
+      }
+      break;
+    }
+    case 3: {
+      if (!selectedOption) {
+        exitSettings = true;
+      }
+      break;
+    }
+    }
+    break;
+  }
+  case btnLEFT: {
+    switch (selectedMenu) {
+    case 0: {
+      break;
+    }
+    case 1: {
+      if (selectedOption) {
+        tempDownHold -= 0.5;
+      } else {
+        tempUpHold -= 0.5;
+      }
+      break;
+    }
+    case 2: {
+      if (selectedOption) {
+        humiDownHold -= 0.5;
+      } else {
+        humiUpHold -= 0.5;
+      }
+      break;
+    }
+    case 3: {
+      if (!selectedOption) {
+        exitSettings = false;
+      }
+      break;
+    }
+    }
+    break;
+  }
+  case btnUP: {
+    switch (selectedMenu) {
+    case 0: {
+      break;
+    }
+    case 1: {
+      if (selectedOption) {
+        selectedOption = false;
+      } else {
+        selectedOption = true;
+      }
+      break;
+    }
+    case 2: {
+      if (selectedOption) {
+        selectedOption = false;
+      } else {
+        selectedOption = true;
+      }
+      break;
+    }
+    case 3: {
+      selectedOption = false;
+      break;
+    }
+    }
+    break;
+  }
+  case btnDOWN: {
+    switch (selectedMenu) {
+    case 0: {
+      break;
+    }
+    case 1: {
+      if (selectedOption) {
+        selectedOption = false;
+      } else {
+        selectedOption = true;
+      }
+      break;
+    }
+    case 2: {
+      if (selectedOption) {
+        selectedOption = false;
+      } else {
+        selectedOption = true;
+      }
+      break;
+    }
+    case 3: {
+      selectedOption = false;
+      break;
+    }
+    }
+    break;
+  }
+  case btnSELECT: {
+    switch (selectedMenu) {
+    case 0: {
+      selectedMenu = 1;
+      splashShown = false;
+      break;
+    }
+    case 1: {
+      selectedMenu = 2;
+      splashShown = false;
+      break;
+    }
+    case 2: {
+      selectedMenu = 3;
+      splashShown = false;
+      break;
+    }
+    case 3: {
+      selectedMenu = 0;
+      splashShown = false;
+      clearScreen = true;
+      break;
+    }
+    }
+    break;
+  }
+  case btnNONE: {
+    break;
+  }
+  }
+}
+
+void selectionShow() {
+  lcd.setCursor(0, 0);
+  if (!selectedOption) {
+    lcd.print('>');
+  } else {
+    lcd.print(" ");
+  }
+  lcd.setCursor(0, 1);
+  if (selectedOption) {
+    lcd.print('>');
+  } else {
+    lcd.print(" ");
+  }
+}
+
+void status1() {
+  // gas sensor print
+  if (ccs.available()) {
+    if (!ccs.readData()) {
+      lcd.setCursor(0, 0);
+      lcd.print(ccs.geteCO2());
+      lcd.print("ppm");
+      lcd.setCursor(10, 0);
+      lcd.print(ccs.getTVOC());
+    }
+  }
+  float h = htu.readHumidity();
+  // Read temperature as Celsius
+  float t = htu.readTemperature();
+
+  lcd.setCursor(0, 1);
+  lcd.print(t, 1);
+  lcd.print(char(223));
+  lcd.print('C');
+  lcd.setCursor(10, 1);
+  lcd.print(h, 1);
+  lcd.print("%");
+}
+
+void settings1() {
+  selectionShow();
+  lcd.setCursor(1, 0);
+  lcd.print("T" + String(char(223)) + " UP   ");
+  lcd.print(tempUpHold, 1);
+  lcd.print(String(char(223)) + "C");
+  lcd.setCursor(1, 1);
+  lcd.print("T" + String(char(223)) + " DOWN ");
+  lcd.print(tempDownHold, 1);
+  lcd.print(String(char(223)) + "C");
+  delay(150);
+}
+
+void settings2() {
+  selectionShow();
+  lcd.setCursor(1, 0);
+  lcd.print("H% UP    ");
+  lcd.print(humiUpHold, 1);
+  lcd.setCursor(1, 1);
+  lcd.print("H% DOWN  ");
+  lcd.print(humiDownHold, 1);
+  delay(150);
+}
+
+void settings3() {
+  selectionShow();
+  lcd.setCursor(0, 0);
+  lcd.print("Exit?     ");
+  if (exitSettings) {
+    lcd.print("YES");
+  }
+  else {
+    lcd.print("NO");
+  }
+  lcd.setCursor(1, 1);
+  lcd.print("Press > to exit");
+  clearScreen = true;
+  delay(150);
+}
+
+void loop() {
+  readButtons();
+  if (exitSettings) {
+    selectedMenu = 0;
+    exitSettings = false;
+  }
+  switch (selectedMenu) {
+  case 0: {
+    if (clearScreen) {
+      lcd.clear();
+      clearScreen = false;
+    }
+    if ((millis() / 1000) % 4 == 0) {
+      status1();
+    }
+    break;
+  }
+  case 1: {
+    if (!splashShown) {
+      lcd.clear();
+      lcd.setCursor(0, 0);
+      lcd.print("Temperature");
+      lcd.setCursor(0, 1);
+      lcd.print("settings");
+      delay(1000);
+      lcd.clear();
+      splashShown = true;
+    }
+    settings1();
+    break;
+  }
+  case 2: {
+    if (!splashShown) {
+      lcd.clear();
+      lcd.setCursor(0, 0);
+      lcd.print("Humidity");
+      lcd.setCursor(0, 1);
+      lcd.print("settings");
+      delay(1000);
+      lcd.clear();
+      splashShown = true;
+    }
+    settings2();
+    break;
+  }
+  case 3: {
+    if (!splashShown) {
+      lcd.clear();
+      splashShown = true;
+    }
+    settings3();
+    break;
+  }
+  }
+}