Hello,
I’m a complete novice but I’m building a weather monitor that displays humidity, ambient temperature and infrared sky temperature both on the LCD and on the serial monitor. I want to be able to input a sky temperature threshold on the serial monitor only so a bleep is triggered when the reading is above that threshold. I have done this and it works but the problem I am having is that I am prompted for input after every reading and I only want to put in the threshold once without the LCD freezing while the serial waits for input because I want the unit to work both as a stand alone device and as something that displays to the serial monitor when needed. I am unsure where to go from here. Any help would be greatly appreciated. Here is the entire code.
#include "DHT.h" // includes the DHT11 library for temperature and humidity
#include <LiquidCrystal.h> // includes the LiquidCrystal Library
#include <Wire.h> // includes the Wire library for the IR thermometer
#include <Adafruit_MLX90614.h> // includes the MLX90614 library for the IR thermometer
#define DHTPIN 8 // Digital pin connected to the DHT sensor (connected to analog pin 8)
// Feather HUZZAH ESP8266 note: use pins 3, 4, 5, 12, 13 or 14 --
// Pin 15 can work but DHT must be disconnected during program upload.
#define DHTTYPE DHT11 // Define the type of DHT sensor (in this case the 3 pin version of DHT11)
int tempThresh; //The temperature thresshold declared as an integer
DHT dht(DHTPIN, DHTTYPE);
LiquidCrystal lcd(12, 2, 4, 5, 6, 7); // Creates an LCD object. Parameters: (rs, enable, d4, d5, d6, d7)
Adafruit_MLX90614 mlx = Adafruit_MLX90614(); // Sets up the IR thermometer
void setup() {
lcd.begin(16,2); // Initializes the interface to the LCD screen, and specifies the dimensions (width and height) of the display }
Serial.begin(9600); // Start serial port
Serial.println(""); // just a blank line as a spacer
Serial.println("Humidity, Ambient Temperature and Infrared Sky Temperature"); // The title for serial monitor
Serial.println(""); // just a blank line as a spacer
Serial.println(""); // just a blank line as a spacer
lcd.println(F("Humidity and ")); // The title for lcd monitor
lcd.setCursor(0,1); // Setting the cursor to the second row
lcd.println(F("Temperature ")); // The title for lcd monitor
dht.begin(); // starts the humidity sensor
mlx.begin(); // starts the IR thermometer
}
void loop() {
// Wait a few seconds between measurements.
delay(2000);
float h = dht.readHumidity();
// Read temperature as Celsius (the default)
float t = dht.readTemperature();
// Read temperature as Fahrenheit (isFahrenheit = true)
float f = dht.readTemperature(true);
// Check if any reads failed and exit early (to try again).
if (isnan(h) || isnan(t) || isnan(f)) {
lcd.clear(); // Clears the display
lcd.setCursor(0,0); // Sets the location at which subsequent text written to the LCD will be displayed
lcd.println(F("DHT sensor fail! ")); // DHT failure warning
return;
}
// Compute heat index in Fahrenheit (the default). This isn't being used due to limitations of LCD screen size but left in anyway.
float hif = dht.computeHeatIndex(f, h);
// Compute heat index in Celsius (isFahreheit = false)
float hic = dht.computeHeatIndex(t, h, false);
lcd.clear(); // Clears the display
lcd.setCursor(0,0); // Sets the location at which subsequent text written to the LCD will be displayed
lcd.print(F("Humidity: ")); // Just the word "humidity"
lcd.print(h); // Print humidity reading
lcd.print(F("% ")); // Percentage symbol
delay(3000); // 3 second delay
lcd.clear(); // Clears the display
lcd.print("Ambient:"); // the word "ambient"
lcd.print(mlx.readAmbientTempC()); // display ambient temperature in celsius
lcd.print((char)223); // The symbol for degrees
lcd.print(F("C ")); // The letter "C"
lcd.setCursor(0,1); // Setting the cursor to the second row
lcd.print("Sky: "); // the word "sky"
lcd.print(mlx.readObjectTempC()); // display sky temperature
lcd.print((char)223); // The symbol for degrees
lcd.print(F("C ")); // The letter "C"
delay(3000); // 3 second delay
//lcd.clear(); // Clears the display
//This section is for user input
Serial.println("Enter sky temperature thresshold "); //Prompt User for Input
while (Serial.available()==0){ } //Wait for User Input
tempThresh = Serial.parseInt(); //Read User Input
Serial.print (tempThresh); //Print user input
Serial.println(""); // just a blank line as a spacer
Serial.println(""); // just a blank line as a spacer
//end of user input section
Serial.print(F("Humidity: ")); // Just the word "humidity"
Serial.print(h); // The humidity
Serial.print(F("%")); // percent symbol
//Serial.println(""); // just a blank line as a spacer
Serial.print(" Ambient: "); // the word 'ambient'
Serial.print(mlx.readAmbientTempC()); // display ambient temperature in celsius
Serial.print(F("°C " )); // The degrees symbol and the letter "C"
//Serial.println(""); // just a blank line as a spacer
Serial.print(" Sky: "); // the word "sky"
Serial.print(mlx.readObjectTempC()); // sky temperature
Serial.print("°C"); // The degrees symbol and the letter "C"
//if statement to ring bell (currently a text warning).
if (mlx.readObjectTempC() > tempThresh) {Serial.print (" - Cloud");}; //Print 'Cloud' if sky temperature is above an input thresshold
if (mlx.readObjectTempC() > tempThresh) {Serial.print ( "\a" );}; //Bleep if sky temperature is above an input thresshold
Serial.println(""); // just a blank line as a spacer
} //End of loop
