X-Git-Url: https://git.toastfreeware.priv.at/toast/airingbutler.git/blobdiff_plain/dd8d9dcb9ab940752f005b4cc5449d270a02c83a..e9898a8dd32afa327d954ebe4adbeb9c856f3b23:/airingbutler.ino

diff --git a/airingbutler.ino b/airingbutler.ino
index 94ba188..c93f4ba 100644
--- a/airingbutler.ino
+++ b/airingbutler.ino
@@ -1,33 +1,103 @@
 #include <SoftwareSerial.h>
+#include <LiquidCrystal.h>
 #include "MHZ19.h"
 
 const int rx_pin = 2; // connect to TX on MHZ19
 const int tx_pin = 3; // connect to RX on MHZ19
 
+const int led_green_pin  = 4;
+const int led_yellow_pin = 5;
+const int led_red_pin    = 6;
+
+const int buzzer_pin = 13;
+
+const int co2_warning_thr = 1000;
+const int co2_alarm_thr   = 1500;
 
 MHZ19 mhz19 = MHZ19(rx_pin,tx_pin);
+LiquidCrystal lcd(7, 8, 9, 10, 11, 12);
+
 unsigned long time;
+int lastppm = 0;
 
 
 void setup()
 {
-    Serial.begin(115200);
-    Serial.println("Time,CO2,Temp");
-    mhz19.begin(rx_pin, tx_pin);
+	Serial.begin(115200);
+	Serial.println("Time,CO2,Temp");
+
+	// MH-Z19
+	mhz19.begin(rx_pin, tx_pin);
+
+	// LCD
+	lcd.begin(16,2);
+	lcd.setCursor(0,0);
+	lcd.print("Airing Butler");
+	lcd.setCursor(0,1);
+	lcd.print("says hello!");
+
+	// LEDs + buzzer
+	pinMode(led_green_pin, OUTPUT);
+	pinMode(led_yellow_pin, OUTPUT);
+	pinMode(led_red_pin, OUTPUT);
+	pinMode(buzzer_pin, OUTPUT);
+	digitalWrite(led_green_pin, HIGH);
+	delay(500);
+	digitalWrite(led_green_pin, LOW);
+	digitalWrite(led_yellow_pin, HIGH);
+	delay(500);
+	digitalWrite(led_yellow_pin, LOW);
+	digitalWrite(led_red_pin, HIGH);
+	delay(500);
+	digitalWrite(led_red_pin, LOW);
+	digitalWrite(buzzer_pin, HIGH);
+	delay(200);
+	digitalWrite(buzzer_pin, LOW);
+
+	lcd.clear();
 }
 
 
 void loop()
 {
-    time = millis();
-    measurement_t m = mhz19.getMeasurement();
-
-    Serial.print(time);
-    Serial.print(",");
-    Serial.print(m.co2_ppm);
-    Serial.print(",");
-    Serial.println(m.temperature);
-    
-    delay(5000);
-}
+	time = millis();
+	measurement_t m = mhz19.getMeasurement();
+
+	Serial.print(time);
+	Serial.print(",");
+	Serial.print(m.co2_ppm);
+	Serial.print(",");
+	Serial.println(m.temperature);
+
+	digitalWrite(led_red_pin, m.co2_ppm >= co2_alarm_thr);
+	digitalWrite(led_yellow_pin, m.co2_ppm >= co2_warning_thr && m.co2_ppm < co2_alarm_thr);
+	digitalWrite(led_green_pin, m.co2_ppm < co2_warning_thr);
+
+	if (m.co2_ppm >= co2_alarm_thr && lastppm < co2_alarm_thr) {
+		digitalWrite(buzzer_pin, HIGH);
+		delay(100);
+		digitalWrite(buzzer_pin, LOW);
+		delay(100);
+		digitalWrite(buzzer_pin, HIGH);
+		delay(100);
+		digitalWrite(buzzer_pin, LOW);
+		delay(100);
+		digitalWrite(buzzer_pin, HIGH);
+		delay(100);
+		digitalWrite(buzzer_pin, LOW);
+	}
 
+	if (m.co2_ppm >= co2_warning_thr && lastppm < co2_warning_thr) {
+		digitalWrite(buzzer_pin, HIGH);
+		delay(500);
+		digitalWrite(buzzer_pin, LOW);
+	}
+
+	lcd.setCursor(0, 0);
+	lcd.print("CO2: ");
+	lcd.print(m.co2_ppm);
+	lcd.print(" ppm         ");
+
+	lastppm = m.co2_ppm;
+	delay(5000);
+}