I've finished this design challenge

I hope everyone had as much fun as I did.

CHECK the other blogs in this series with this search.

• ALL THE BLOGS IN THE Just Encase Series

Steve K  (skruglewicz)

Here is the entire sketch that will run on the Nano 33 IoT:

CODE WAS MOVED HERE FROM MY BLOG ABOVE

• /* 
    Sketch generated by the Arduino IoT Cloud Thing "1554H2GYCL "
    https://create.arduino.cc/cloud/things/f6a8d66c-2702-45e7-b93a-a2d41f9bedb8 
  
    Arduino IoT Cloud Variables description
  
    The following variables are automatically generated and updated when changes are made to the Thing
  
    String water;
    float dust;
    float temp;
    int waterInt;
  
    Variables which are marked as READ/WRITE in the Cloud Thing will also have functions
    which are called when their values are changed from the Dashboard.
    These functions are generated with the Thing and added at the end of this sketch.
  */
  
  #include "thingProperties.h"
  String inputString = "";         // a String to hold incoming data
  bool stringComplete = false;  // whether the string is complete
  
  float retFloat(String stringOne) {
    // Given a tuple pair in the form varname:value ex. inTemp:1.1
    // return a float value to the right of the colon character
  //Serial.println(stringOne);
  int firstClosingBracket = stringOne.indexOf(':');
  String value = String(stringOne.substring(firstClosingBracket+1));
  //Serial.println(value);
  float val  = value.toFloat();
     return val;
  }
  
  String retString(String stringOne) {
    // Given a tuple pair in the form varname:value ex. inTemp:1.1
    // return a int  value to the right of the colon character
  //Serial.println(stringOne);
  int firstClosingBracket = stringOne.indexOf(':');
  String value = stringOne.substring(firstClosingBracket+1);
  //Serial.println(value);
  //float val  = value.toInt();
     return value;
  }
  
  String getType(String stringOne){
    int colon = stringOne.indexOf(':');
    String value = stringOne.substring(0,colon);
    //Serial.println(value);
       return value;  
  }
  
  void setup() {
    // Initialize serial and wait for port to open:
    Serial.begin(9600);
    Serial1.begin(9600);
    
    // This delay gives the chance to wait for a Serial Monitor without blocking if none is found
    delay(1500); 
  
    // Defined in thingProperties.h
    initProperties();
  
    // Connect to Arduino IoT Cloud
    ArduinoCloud.begin(ArduinoIoTPreferredConnection);
    //delay(3000);
    
    /*
       The following function allows you to obtain more information
       related to the state of network and IoT Cloud connection and errors
       the higher number the more granular information you’ll get.
       The default is 0 (only errors).
       Maximum is 4
   */
    setDebugMessageLevel(2);
    ArduinoCloud.printDebugInfo();
  }
  
  
  void loop() {
    ArduinoCloud.update();
    // Your code here 
    
    // use the string when a newline arrives:
    if (stringComplete) {
      Serial.print("received on RX PIN:");
      Serial.print(inputString);
  
      
      //USE THE InputString HERE
      // get the type of var
      String type = getType(inputString);
      
      if(type == "Temp"){
        temp = retFloat(inputString); 
        Serial.print("Sending value = ");
        Serial.println(temp);
      }
      
      if(type == "Dust"){
        dust = retFloat(inputString); 
        Serial.print("Sending value = ");
        Serial.println(dust);
      }
      
      if(type == "Water"){
        water = retString(inputString); 
        if (water == "WET\n"){
          waterInt = 0;
        }
        if (water == "DRY\n"){
          waterInt = 1;
        }
        Serial.print("Sending value = ");
        Serial.print(water);
        Serial.println(waterInt);
      }  
      
      inputString = "";
      stringComplete = false;
    }
    
    //At the very end of the loop check for serial data
    serialEvent();
    
  }
  
  /*
    SerialEvent occurs whenever a new data comes in the hardware serial RX. This
    routine is run between each time loop() runs, so using delay inside loop can
    delay response. Multiple bytes of data may be available.
  */
  void serialEvent() {
    while (Serial1.available()) {
      // get the new byte:
      char inChar = (char)Serial1.read();
      // add it to the inputString:
      
      inputString += inChar;
      // if the incoming character is a newline, set a flag so the main loop can
      // do something about it:
      if (inChar == '\n') {
        stringComplete = true;
      }
    }
  }
  /*
    Since Temp is READ_WRITE variable, onTempChange() is
    executed every time a new value is received from IoT Cloud.
  */
  void onTempChange()  {
    // Add your code here to act upon Temp change
  }
  
  /*
    Since Water is READ_WRITE variable, onWaterChange() is
    executed every time a new value is received from IoT Cloud.
  */
  void onWaterChange()  {
    // Add your code here to act upon Water change
  }
  
  /*
    Since WaterInt is READ_WRITE variable, onWaterIntChange() is
    executed every time a new value is received from IoT Cloud.
  */
  void onWaterIntChange()  {
    // Add your code here to act upon WaterInt change
  }
  
  /*
    Since Dust is READ_WRITE variable, onDustChange() is
    executed every time a new value is received from IoT Cloud.
  */
  void onDustChange()  {
    // Add your code here to act upon Dust change
  }

CODE- MKR_LoRa_Sender_E2.ino

CODE WAS MOVED HERE FROM MY BLOG ABOVE

/*
MKR_LoRa_Sender_E2.ino
This Sketch, will be used to transmit LoRaWAN packets to the MKR2 LoRa Receiver board.
it will have 3 Grove sensors and 1 Grove LCD display connected to the Arduino MKR Connector Carrier.
a MKR WAN 1300 (MKR1) is attached to the Carrier.
one by one, each sensor is read.
after each sensor is read, a LoRa packet with the sensor value is sent 
In the packet send function the value is displayed on the LCD display.
*/

// MKRWAN - Version: 1.0.15
#include <MKRWAN.h>

#include <SPI.h>
#include <LoRa.h>
#include <Wire.h>
#include "rgb_lcd.h"

// Grove LCD DISPLAY
rgb_lcd lcd;      //instantiate lcd Object

// Grove TEMPERATURE Sensor
const int pinTemp = A0;      // pin of temperature sensor
float temperature;
float TempF;                 // tempreture in ferienheight
int B=3975;                  // B value of the thermistor
float resistance;

//Grove WATER Sensor
#define WATER_SENSOR 2
String WaterStatus;

// Grove Dust Sensor 
int pin = 4;
unsigned long duration;
unsigned long starttime;
unsigned long sampletime_ms = 30000;//sampe 30s ;
unsigned long lowpulseoccupancy = 0;
float ratio = 0;
float concentration = 0;
float DustStatus;

//DISPLAY STRING
void Display(String title,String message){
// display title and message on the LCD display
// Put title on the 1st line 
// put message on the 2nd line
  
  //DISPLAY TITLE
  // set the cursor to (0,0):
  lcd.setCursor(0, 0);
  lcd.print(title);
  lcd.print(" . . . . . . . .");
  delay(2000);
 
  //DISPLAY MESSAGE - on a scrolling message on the 2nd line
  // set the cursor to (16,1):
  lcd.setCursor(16,1);
  // set the display to automatically scroll:
  lcd.autoscroll();
  lcd.print(message);
  delay(2000);

  //CLEAN UP
  // turn off automatic scrolling
  lcd.noAutoscroll();
  // clear screen for the next Message
  lcd.clear();
}

void setup() {
  
  // Grove LCD DISPLAY SECTION
  // set up the LCD's number of columns and rows:
  lcd.begin(16, 2);

  // LoRa INIT SECTION
  //SHUT OFF SERIAL
  //  Serial.begin(9600);
  //  Serial.println("LoRa Sender");
  Display("LoRa Sender","Started...");
  if (!LoRa.begin(915E6)) {
    while(1){
      //SHUT OFF SERIAL
      Serial.println("Starting LoRa failed!");
      Display("Starting LoRa ","failed!");
    }  
  }
  
  //Grove TEMPERATURE 
    pinMode(A0,INPUT);      //Setting the A0 pin as input pin to take data from the temperature sensor 

  //Grove WATER Sensor
  pinMode(WATER_SENSOR, INPUT); 

  // Grove Dust Sensor 
  pinMode(pin,INPUT);
  starttime = millis();//get the current time;

}



// SEND LORA PACKET
void SendPacket(String type, String value){
  String tuple;
  tuple = String(type) + String(value);
  
  //display the packet contents
  Display("Sending packet: ", tuple );
  //Display(type);
  //Display(value);
  
  // send packet
  LoRa.beginPacket();
  LoRa.print(type);
  LoRa.print(value);
  LoRa.endPacket();
}

//GET THE WATER DETECT VALUE  WET/DRY 0/1
String GetWaterStatus(){
  String stat;
  int val;
  val = digitalRead(WATER_SENSOR);
  
  if (val == 0){
    stat = "WET";
  }
  if (val == 1){
    stat = "DRY";
  }
//  if ((val != 0) || (val != 1) ){
//    stat = "Water Sensor ERROR";
//  }  
  return stat;
}

//GET DUST PARTICLE CONCENTRATION
float GetDustParticle(){
  bool finished = false;
  
  do{
    
      duration = pulseIn(pin, LOW);
      lowpulseoccupancy = lowpulseoccupancy+duration;
   
      if ((millis()-starttime) > sampletime_ms)//if the sampel time == 30s
      {
          ratio = lowpulseoccupancy/(sampletime_ms*10.0);  // Integer percentage 0=>100
          concentration = 1.1*pow(ratio,3)-3.8*pow(ratio,2)+520*ratio+0.62; // using spec sheet curve
          
          if (lowpulseoccupancy > 0)
          {
            Serial.print(lowpulseoccupancy);
            Serial.print(",");
            Serial.print(ratio);
            Serial.print(",");
            Serial.println(concentration);
          }
          
          lowpulseoccupancy = 0;
          starttime = millis();
          finished = true;
      }
  } while (!finished);

  return concentration;
    
}

//GET THE CURRENT Grove Sensor TEMPERATURE
float GetTemp(){
  
  int val = analogRead(pinTemp);                               // get analog value
  resistance=(float)(1023-val)*10000/val;                      // get resistance
  temperature=1/(log(resistance/10000)/B+1/298.15)-273.15;     // calc temperature in celsius
  TempF = (temperature * 9/5) + 32;                            // calc temp in ferenheight  
                                
  return TempF;
}

void loop() {

  //get the current Temperature
  TempF = GetTemp();
  //SEND THE PACKET
  
  SendPacket("Temp:",String(TempF));

  //get the water status
  WaterStatus = GetWaterStatus();
  SendPacket("Water:",WaterStatus);

  // get the dust particle status - Concentration
  DustStatus = GetDustParticle();
  SendPacket("Dust:",String(DustStatus)); 
 
  //delay(5000);
}