X-Git-Url: https://git.toastfreeware.priv.at/toast/airingbutler.git/blobdiff_plain/2776b111a5326681c720858251ccf3788b54020d..66f287bf4f7cae9ad45b2ceba74f3f28d6104f80:/airingbutler.ino

diff --git a/airingbutler.ino b/airingbutler.ino
index 8ea9d41..92461a6 100644
--- a/airingbutler.ino
+++ b/airingbutler.ino
@@ -1,29 +1,116 @@
 #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;
+
+const unsigned long warmuptime   = 60000; // 1 min.
+const unsigned long cooldowntime = 60000; // 1 min.
 
 MHZ19 mhz19 = MHZ19(rx_pin,tx_pin);
+LiquidCrystal lcd(7, 8, 9, 10, 11, 12);
+
+unsigned long time;
+unsigned long lastwarntime = 0;
+int co2 = 0;
+int temp = 0;
+int lastppm = 0;
 
+void buzz(unsigned long pause, int count) {
+	for (int i = 0; i <= count; i++) {
+		digitalWrite(buzzer_pin, HIGH);
+		delay(pause);
+		digitalWrite(buzzer_pin, LOW);
+		if (i < count - 1) delay(pause);
+	}
+}
 
 void setup()
 {
-    Serial.begin(115200);
-    Serial.println("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
+	pinMode(led_green_pin, OUTPUT);
+	pinMode(led_yellow_pin, OUTPUT);
+	pinMode(led_red_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);
+
+	// buzzer
+	pinMode(buzzer_pin, OUTPUT);
+	buzz(200, 1);
+
+	lcd.clear();
 }
 
 
 void loop()
 {
-    measurement_t m = mhz19.getMeasurement();
+	time = millis();
+	measurement_t m = mhz19.getMeasurement();
+	co2 = m.co2_ppm;
+	temp = m.temperature;
 
-    Serial.print(m.co2_ppm);
-    Serial.print(",");
-    Serial.println(m.temperature);
-    
-    delay(500);
-}
+	Serial.print(time);
+	Serial.print(",");
+	Serial.print(co2);
+	Serial.print(",");
+	Serial.println(temp);
+
+	digitalWrite(led_red_pin, co2 >= co2_alarm_thr);
+	digitalWrite(led_yellow_pin, co2 >= co2_warning_thr && co2 < co2_alarm_thr);
+	digitalWrite(led_green_pin, co2 < co2_warning_thr);
 
+	if (co2 >= co2_alarm_thr && lastppm < co2_alarm_thr && time - lastwarntime > cooldowntime) {
+		buzz(100, 3);
+		lastwarntime = time;
+	}
+
+	if (co2 >= co2_warning_thr && lastppm < co2_warning_thr && time - lastwarntime > cooldowntime) {
+		buzz(500, 1);
+		lastwarntime = time;
+	}
+
+	lcd.setCursor(0, 0);
+	lcd.print("CO2: ");
+	lcd.print(co2);
+	if (time < warmuptime && (co2 == -1 || co2 == 410)) {
+		lcd.print (" (W)");
+	}
+	lcd.print(" ppm    ");
+	lcd.setCursor(0, 1);
+	lcd.print("Temp: ");
+	lcd.print(temp);
+	lcd.print(" C +/-  ");
+
+	lastppm = co2;
+	delay(5000);
+}