X-Git-Url: https://git.toastfreeware.priv.at/toast/airingbutler.git/blobdiff_plain/77ddbde90ffdf3a4a6265094f0d2c33844cd3724..0f9922d340f33409410c2b8cf6a8d2adf9bda1bd:/airingbutler.ino

diff --git a/airingbutler.ino b/airingbutler.ino
index b4579e6..ebdc5ee 100644
--- a/airingbutler.ino
+++ b/airingbutler.ino
@@ -14,12 +14,14 @@ 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 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;
@@ -83,18 +85,12 @@ void loop()
 	Serial.print(",");
 	Serial.println(temp);
 
+	// LEDs
 	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) {
-		buzz(100, 3);
-	}
-
-	if (co2 >= co2_warning_thr && lastppm < co2_warning_thr) {
-		buzz(500, 1);
-	}
-
+	// LCD
 	lcd.setCursor(0, 0);
 	lcd.print("CO2: ");
 	lcd.print(co2);
@@ -107,6 +103,16 @@ void loop()
 	lcd.print(temp);
 	lcd.print(" C +/-  ");
 
+	// buzzer
+	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;
+	}
+
 	lastppm = co2;
 	delay(5000);
 }