Temperature Monitoring with Arduino IoT Cloud using DHT22

1/* 
2  Sketch generated by the Arduino IoT Cloud Thing "MKR WiFi 1010 and DHT22"
3  https://create.arduino.cc/cloud/things/e75efe13-eb5e-432a-86d3-0bf1cd34aaac 
4  
5Arduino IoT Cloud Variables description
6
7  The following variables are automatically generated and updated when changes are made to the Thing
8
9  CloudTemperatureSensor temperature;
10  CloudRelativeHumidity humidity;
11
12  Variables which are marked as READ/WRITE in the Cloud Thing will also have functions
13  which are called when their values are changed from the Dashboard.
14  These functions are generated with the Thing and added at the end of this sketch.
15*/
16
17#include "thingProperties.h"
18#include <Adafruit_Sensor.h>
19#include <DHT.h>
20#include <DHT_U.h>
21
22#define DHTPIN 7    // Digital pin connected to the DHT sensor 
23#define DHTTYPE    DHT22     // Write DHT11 or DHT22 According to your Sensor
24
25DHT_Unified dht(DHTPIN, DHTTYPE);
26uint32_t delayMS;
27unsigned long previousMillis = 0;
28const long interval = 20000; //milliseconds  total time for 20 Seconds
29
30
31
32void setup() {
33  // Initialize serial and wait for port to open:
34  Serial.begin(9600);
35  // This delay gives the chance to wait for a Serial Monitor without blocking if none is found
36  delay(1500); 
37
38  // Defined in thingProperties.h
39  initProperties();
40
41  // Connect to Arduino IoT Cloud
42  ArduinoCloud.begin(ArduinoIoTPreferredConnection);
43  
44  /*
45     The following function allows you to obtain more information
46     related to the state of network and IoT Cloud connection and errors
47     the higher number the more granular information you’ll get.
48     The default is 0 (only errors).
49     Maximum is 4
50 */
51  setDebugMessageLevel(2);
52  ArduinoCloud.printDebugInfo();
53
54  dht.begin(); //Init DHT
55
56  Serial.println(F("DHTxx Unified Sensor Example"));
57  // Print temperature sensor details.
58  sensor_t sensor;
59  dht.temperature().getSensor(&sensor);
60  Serial.println(F("------------------------------------"));
61  Serial.println(F("Temperature Sensor"));
62  Serial.print  (F("Sensor Type: ")); Serial.println(sensor.name);
63  Serial.print  (F("Driver Ver:  ")); Serial.println(sensor.version);
64  Serial.print  (F("Unique ID:   ")); Serial.println(sensor.sensor_id);
65  Serial.print  (F("Max Value:   ")); Serial.print(sensor.max_value); Serial.println(F("°C"));
66  Serial.print  (F("Min Value:   ")); Serial.print(sensor.min_value); Serial.println(F("°C"));
67  Serial.print  (F("Resolution:  ")); Serial.print(sensor.resolution); Serial.println(F("°C"));
68  Serial.println(F("------------------------------------"));
69  // Print humidity sensor details.
70  dht.humidity().getSensor(&sensor);
71  Serial.println(F("Humidity Sensor"));
72  Serial.print  (F("Sensor Type: ")); Serial.println(sensor.name);
73  Serial.print  (F("Driver Ver:  ")); Serial.println(sensor.version);
74  Serial.print  (F("Unique ID:   ")); Serial.println(sensor.sensor_id);
75  Serial.print  (F("Max Value:   ")); Serial.print(sensor.max_value); Serial.println(F("%"));
76  Serial.print  (F("Min Value:   ")); Serial.print(sensor.min_value); Serial.println(F("%"));
77  Serial.print  (F("Resolution:  ")); Serial.print(sensor.resolution); Serial.println(F("%"));
78  Serial.println(F("------------------------------------"));
79  // Set delay between sensor readings based on sensor details.
80  delayMS = sensor.min_delay / 1000;
81  STHAM();
82  
83}
84
85void loop() {
86  ArduinoCloud.update();
87  // Your code here 
88  
89  unsigned long currentMillis = millis();
90  if (currentMillis - previousMillis >= interval) {
91    STHAM();
92    previousMillis = currentMillis;
93  }
94}
95
96
97void STHAM(){
98  // Get temperature event and print its value.
99  sensors_event_t event;
100  dht.temperature().getEvent(&event);
101  if (isnan(event.temperature)) {
102    Serial.println(F("Error reading temperature!"));
103    //Assign temperature value 0 to Cloud Variable
104    temperature=0;
105  }
106  else {
107    Serial.print(F("Temperature: "));
108    Serial.print(event.temperature);
109    Serial.println(F("°C"));
110    //Assign temperature value to Cloud Variable
111    temperature=event.temperature;
112  }
113  
114  // Get humidity event and print its value.
115  dht.humidity().getEvent(&event);
116  if (isnan(event.relative_humidity)) {
117    Serial.println(F("Error reading humidity!"));
118    //Assign humidity value 0 to Cloud Variable
119    humidity=0;
120  }
121  else {
122    Serial.print(F("Humidity: "));
123    Serial.print(event.relative_humidity);
124    Serial.println(F("%"));
125    //Assign humidity value to Cloud Variable
126    humidity=event.relative_humidity;
127  }
128}
129
130/*
131  Since Temperature is READ_WRITE variable, onTemperatureChange() is
132  executed every time a new value is received from IoT Cloud.
133*/
134void onTemperatureChange()  {
135  // Add your code here to act upon Temperature change
136}
137
138/*
139  Since Humidity is READ_WRITE variable, onHumidityChange() is
140  executed every time a new value is received from IoT Cloud.
141*/
142void onHumidityChange()  {
143  // Add your code here to act upon Humidity change
144}