reinitialize lcd with .begin() before writing

[toast/airingbutler.git] / airingbutler.ino

diff --git a/airingbutler.ino b/airingbutler.ino
index b1bbaf9507a822dbdb113a390a99f82d0a5d23eb..a3308644643c775820ddd3a0962d92cce4f70708 100644 (file)
--- a/airingbutler.ino
+++ b/airingbutler.ino
@@ -1,29 +1,124 @@
 #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);
-    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();
-
-    Serial.print("co2: ");
-    Serial.println(m.co2_ppm);
-    Serial.print("temp: ");
-    Serial.println(m.temperature);
-    
-    delay(500);
-}
+       time = millis();
+       measurement_t m = mhz19.getMeasurement();
+       co2 = m.co2_ppm;
+       temp = m.temperature;
+
+       Serial.print(time);
+       Serial.print(",");
+       Serial.print(co2);
+       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);
+
+       // LCD
+       if (time < warmuptime && (co2 == -1 || co2 == 410)) {
+               lcd.begin(16, 2);
+               lcd.setCursor(0, 0);
+               lcd.print("Airing Butler");
+               lcd.setCursor(0, 1);
+               lcd.print("is warming up...");
+       } else {
+               lcd.begin(16 ,2);
+               lcd.setCursor(0, 0);
+               lcd.print("CO2: ");
+               lcd.print(co2);
+               lcd.print(" ppm    ");
+               lcd.setCursor(0, 1);
+               lcd.print("Temp: ");
+               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);
+}