270 lines
6.6 KiB
C++
270 lines
6.6 KiB
C++
#include <Arduino.h>
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#include "LiquidCrystal_I2C.h"
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#include "WiFiSettings.h"
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#include "ArduinoJson.h"
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#include <SparkFun_SCD4x_Arduino_Library.h>
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#include <HTTPClient.h>
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#include <SPIFFS.h>
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#include "wifiFix.h"
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String weather_lat = "";
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String weather_long = "";
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String weather_apikey = "";
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String weather_final_url = "";
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SCD4x scd4x;
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LiquidCrystal_I2C LCD(0x27,2,1,0,4,5,6,7,3,POSITIVE);
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WiFiClient* wifi = new WiFiClientFixed();
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HTTPClient* http = new HTTPClient();
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#define PIN_LED_GREEN 25
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#define PIN_LED_YELLOW 33
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#define PIN_LED_RED 32
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int backlightState = HIGH;
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volatile bool interruptFired = false;
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unsigned long lastInterrupt = 0;
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unsigned long lastUpdated = 0;
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unsigned long lastWeatherUpdate = 0;
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bool weatherUpdateSuccess = false;
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int lastWeatherPressure = 0;
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int avgAtmosphericPressure = 1013;
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unsigned const int updateTimer = 5000;
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unsigned const int interruptTimer = 500;
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void led(int red, int green, int yellow)
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{
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analogWrite(PIN_LED_RED, red);
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analogWrite(PIN_LED_GREEN, green);
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analogWrite(PIN_LED_YELLOW, yellow);
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}
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void IRAM_ATTR BacklightToggle() {
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if (!interruptFired)
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interruptFired = true;
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}
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void UpdateWeatherData() {
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if (lastWeatherUpdate != 0 && millis() - lastWeatherUpdate < 60000) {
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return;
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}
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lastWeatherUpdate = millis();
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Serial.print("Attempting to get weather data from ");
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Serial.println(weather_final_url);
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http->begin(*wifi, weather_final_url);
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int httpResponseCode = http->GET();
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if (httpResponseCode == 200) {
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String payload = http->getString();
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http->end();
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Serial.println(payload);
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StaticJsonDocument<1024> doc;
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DeserializationError error = deserializeJson(doc, payload.c_str());
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if (error) {
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weatherUpdateSuccess = false;
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lastWeatherPressure = avgAtmosphericPressure;
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}
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float coord_lon = doc["coord"]["lon"]; // 3.45
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float coord_lat = doc["coord"]["lat"]; // 1.23
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JsonObject weather_0 = doc["weather"][0];
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int weather_0_id = weather_0["id"]; // 804
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const char* weather_0_main = weather_0["main"]; // "Clouds"
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const char* weather_0_description = weather_0["description"]; // "overcast clouds"
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const char* weather_0_icon = weather_0["icon"]; // "04d"
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const char* base = doc["base"]; // "stations"
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JsonObject main = doc["main"];
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float main_temp = main["temp"]; // 301.92
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float main_feels_like = main["feels_like"]; // 306.28
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float main_temp_min = main["temp_min"]; // 301.92
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float main_temp_max = main["temp_max"]; // 301.92
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int main_pressure = main["pressure"]; // 1012
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int main_humidity = main["humidity"]; // 75
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int main_sea_level = main["sea_level"]; // 1012
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int main_grnd_level = main["grnd_level"]; // 1012
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int visibility = doc["visibility"]; // 10000
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JsonObject wind = doc["wind"];
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float wind_speed = wind["speed"]; // 4.71
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int wind_deg = wind["deg"]; // 219
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float wind_gust = wind["gust"]; // 4.52
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int clouds_all = doc["clouds"]["all"]; // 100
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long dt = doc["dt"]; // 1684079803
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long sys_sunrise = doc["sys"]["sunrise"]; // 1684042647
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long sys_sunset = doc["sys"]["sunset"]; // 1684086466
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int timezone = doc["timezone"]; // 0
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int id = doc["id"]; // 0
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const char* name = doc["name"]; // nullptr
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int cod = doc["cod"]; // 200
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lastWeatherPressure = main_pressure;
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weatherUpdateSuccess = true;
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Serial.println(String("Got pressure: ") + lastWeatherPressure);
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}
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else {
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http->end();
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lastWeatherPressure = avgAtmosphericPressure;
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weatherUpdateSuccess = false;
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Serial.println(String("Failed getting pressure (Error code: ") + httpResponseCode + String("), using avg atmospheric pressure: ") + lastWeatherPressure);
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}
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}
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void UpdateSensorCompensation(){
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if (weatherUpdateSuccess) {
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scd4x.setAmbientPressure(lastWeatherPressure * 100); // It wants the data in Pascal!
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}
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}
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void setup()
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{
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Serial.begin(115200);
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LCD.begin(16, 2);
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LCD.clear();
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LCD.setBacklight(backlightState);
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LCD.print("WiFi init...");
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SPIFFS.begin(true);
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WiFiSettings.hostname = "co2-scd4x-";
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weather_apikey = WiFiSettings.string("OpenWeatherMap API key", "hskjdfghjkdfhgyuw");
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weather_lat = WiFiSettings.string("Location: latitude", "1.23");
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weather_long = WiFiSettings.string("Location: longitude", "3.45");
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weather_final_url = "http://api.openweathermap.org/data/2.5/weather?lat=" + weather_lat + "&lon=" + weather_long + "&appid=" + weather_apikey;
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WiFiSettings.connect();
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scd4x.enableDebugging();
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if (!scd4x.begin(Wire)) {
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Serial.println("Could not find SCD4x? Check wiring");
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LCD.clear();
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LCD.print("SCD4x not found");
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LCD.setCursor(0, 1);
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LCD.print("Check wiring");
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while (true);
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}
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scd4x.stopPeriodicMeasurement();
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LCD.setCursor(0, 0);
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LCD.print("SCD4x SELF TEST ");
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if (!scd4x.performSelfTest()) {
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Serial.println("SCD4x self test failed");
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LCD.setCursor(0, 1);
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LCD.print("FAIL");
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while (true);
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}
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scd4x.setAutomaticSelfCalibrationEnabled(true);
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LCD.setCursor(0, 1);
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LCD.print("PASS");
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delay(1000);
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Serial.println("SCD4x init:");
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char mySerial[16];
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scd4x.getSerialNumber(mySerial);
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Serial.print("Serial no: ");
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Serial.println(mySerial);
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LCD.setCursor(6, 0);
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LCD.print("SERIAL # ");
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LCD.setCursor(0, 1);
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LCD.print(mySerial);
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delay(1000);
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Serial.print("Altitude: ");
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Serial.println(scd4x.getSensorAltitude());
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Serial.print("Self-cal enabled: ");
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Serial.println(scd4x.getAutomaticSelfCalibrationEnabled() ? "Yes" : "No");
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Serial.print("Temperature Offset: ");
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Serial.println(scd4x.getTemperatureOffset());
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UpdateWeatherData();
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UpdateSensorCompensation();
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scd4x.startPeriodicMeasurement();
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pinMode(23, INPUT_PULLUP);
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attachInterrupt(23, BacklightToggle, FALLING);
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LCD.clear();
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}
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void loop() {
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if (interruptFired) {
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if (millis() - lastInterrupt > interruptTimer || lastInterrupt == 0) {
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backlightState = !backlightState;
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Serial.printf("Setting backlight to %i \n", backlightState);
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LCD.setBacklight(backlightState);
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lastInterrupt = millis();
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}
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interruptFired = false;
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}
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if (millis() - lastUpdated > updateTimer || lastUpdated == 0) {
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lastUpdated = millis();
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} else {
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return;
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}
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UpdateWeatherData();
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UpdateSensorCompensation();
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int co2 = scd4x.getCO2();
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float temp = scd4x.getTemperature();
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float rh = scd4x.getHumidity();
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LCD.setCursor(0, 0);
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LCD.print(temp, 1);
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LCD.print((char)223); // Degree symbol (º)
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LCD.print("C ");
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LCD.setCursor(9, 0);
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LCD.print(rh, 1);
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LCD.print("%rH");
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LCD.setCursor(0, 1);
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LCD.print(co2);
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LCD.print("ppm ");
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LCD.setCursor(9, 1);
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if (weatherUpdateSuccess)
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LCD.print(lastWeatherPressure);
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else
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LCD.print("----");
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LCD.print("hPa");
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Serial.print(co2);
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Serial.print(" ppm, ");
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Serial.print(temp);
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Serial.print(" ºC, ");
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Serial.print(rh);
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Serial.println(" %rH");
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if (co2 < 1000)
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led(0, 1, 0);
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else if (co2 < 1500)
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led(0, 0, 5);
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else
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led(5, 0, 0);
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}
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