X-Git-Url: https://git.toastfreeware.priv.at/toast/airingbutler.git/blobdiff_plain/a51d525b75ead2c23ef83795d8ff60b76796d72c..66f287bf4f7cae9ad45b2ceba74f3f28d6104f80:/airingbutler.ino

diff --git a/airingbutler.ino b/airingbutler.ino
index a446855..92461a6 100644
--- a/airingbutler.ino
+++ b/airingbutler.ino
@@ -14,11 +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 cooldowntime = 60000; // 1 min.
+
 MHZ19 mhz19 = MHZ19(rx_pin,tx_pin);
 LiquidCrystal lcd(7, 8, 9, 10, 11, 12);
 
 unsigned long time;
-unsigned long warmuptime = 60000; // 1 min.
+unsigned long lastwarntime = 0;
 int co2 = 0;
 int temp = 0;
 int lastppm = 0;
@@ -86,12 +89,14 @@ void loop()
 	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) {
+	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) {
+	if (co2 >= co2_warning_thr && lastppm < co2_warning_thr && time - lastwarntime > cooldowntime) {
 		buzz(500, 1);
+		lastwarntime = time;
 	}
 
 	lcd.setCursor(0, 0);