Hello !
Trace: • Data storage • Introduction • DHT and OLED example • Introduction • Current example • Oled display example • Setup • Programmeerimine

Differences

This shows you the differences between two versions of the page.

Link to this comparison view

Both sides previous revisionPrevious revision
Next revision		Previous revision
en:iot:examples:dhtoled [2020/06/10 17:09] – heikopikneren:iot:examples:dhtoled [Unknown date] (current) – external edit (Unknown date) 127.0.0.1
Line 1: Line 1:
 ====== DHT and OLED example ====== ====== DHT and OLED example ======
  
-This example demonstrates how to send a DHT senor temperature and humidity readings to the OLED screen with the ITT IoT framework.+This example demonstrates how DHT senor can send temperature and humidity readings to the OLED screen with the ITT IoT framework.
 For this example you will need two controllers. One with the OLED shield and the other with the DHT sensor shield. For this example you will need two controllers. One with the OLED shield and the other with the DHT sensor shield.
  
-{{:en:iot:examples:20200610_200205.jpg?300|OLED and DHT example}}+{{:en:iot:examples:20200610_200205.jpg?300|DHT and OLED example}}
  
 Once the code has been uploaded the DHT controller will send temperature and humidity messages via MQTT to the OLED module.  Once the code has been uploaded the DHT controller will send temperature and humidity messages via MQTT to the OLED module. 
Line 12: Line 12:
  
 The following is the code for the controller with the DHT shield. Needed libaries: The following is the code for the controller with the DHT shield. Needed libaries:
-<code>lib_deps = ITTIoT@1.0.5, DHT sensor library, Adafruit Unified Sensor</code>+<code>lib_deps = ITTIoT, DHT sensor library, Adafruit Unified Sensor</code> 
 +<fc #ff0000>After programming, if NAN appears instead of readings, the USB cable should be disconnected and reconnected!</fc>
 <code c> <code c>
 +// Includes global variables and librarys that the DHT uses
 #include <Arduino.h> #include <Arduino.h>
 #include <ittiot.h> #include <ittiot.h>
 +#include <Ticker.h>
 #include <DHT.h> #include <DHT.h>
  
-#define DHTPIN D3     // Pin where DHT shield is connected. Change this to D4 if your shield has no legs removed.+#define WIFI_NAME "name" 
 +#define WIFI_PASSWORD "password" 
 + 
 +#define DHTPIN D3     // Pin where DHT shield is connected. Change this to D4 if the shield has no legs removed.
 #define DHTTYPE DHT22   // DHT 22  (AM2302) #define DHTTYPE DHT22   // DHT 22  (AM2302)
  
Line 24: Line 30:
 DHT dht(DHTPIN, DHTTYPE); DHT dht(DHTPIN, DHTTYPE);
  
-// Message received +// Create an object for Ticker library 
-void iot_received(String topic, String msg) +Ticker timeTicker;
-{+
  
 +bool sendDataFlag;
 +
 +// Ticker library callback, which will occur 0.5 second interval.
 +void sendData()
 +{
 +  sendDataFlag=true;
 } }
  
Line 42: Line 53:
 { {
   // Initialize serial port and send message   // Initialize serial port and send message
-  Serial.begin(115200);+  Serial.begin(115200); // setting up serial connection parameter
   Serial.println("Booting");   Serial.println("Booting");
  
-  // print IoT json config to serial +  //iot.setConfig("wname", WIFI_NAME); 
-  iot.printConfig(); +  //iot.setConfig("wpass", WIFI_PASSWORD); 
- +  iot.printConfig(); // print IoT json config to serial 
-  // Initialize IoT library +  iot.setup(); // Initialize IoT library
-  iot.setup();+
  
   // Initialize DHT library   // Initialize DHT library
   dht.begin();   dht.begin();
 +
 +  // Initialize Ticker interval and callback
 +  timeTicker.attach(1, sendData);
 } }
  
 void loop() void loop()
 { {
-  // IoT behind the plan work, it should be periodically called +  iot.handle(); // IoT behind the plan work, it should be periodically called
-  iot.handle();+
  
-  // Read humidity and temperature +  if(sendDataFlag) 
-  float h = dht.readHumidity(); +  { 
- float t = dht.readTemperature();+    sendDataFlag = false; 
 +    // Read humidity and temperature 
 +    float h = dht.readHumidity(); 
 +    float t = dht.readTemperature();
  
-  // Create a buffer to store strings to being sent later +    // Create a buffer to store strings to being sent later 
-  char buf[10];+    char buf[10];
  
-  // Convert messages to strings and send to the MQTT server +    // Convert temperature value messages to strings and send to the MQTT server 
- String(t).toCharArray(buf,10); +    String(t).toCharArray(buf,10); 
-  iot.publishMsg("temp",buf); +    iot.publishMsg("temp",buf);
- delay(1000);+
  
- String(h).toCharArray(buf,10); +    // Convert humidity value messages to strings and send to the MQTT server 
-  iot.publishMsg("hum",buf); +    String(h).toCharArray(buf,10); 
- delay(1000);+    iot.publishMsg("hum",buf); 
 +  }
 } }
  
Line 80: Line 95:
  
 The following is the code for the controller module with the OLED shield. The following is the code for the controller module with the OLED shield.
-<code>lib_deps = ITTIoT@1.0.5, MFRC522, Adafruit GFX Library, Adafruit SSD1306 Wemos Mini OLED</code>+<code>lib_deps = ITTIoT, Adafruit GFX Library, Adafruit SSD1306 Wemos Mini OLED, adafruit/Adafruit BusIO</code>
 <code c> <code c>
 +// Includes global variables and librarys that the OLED display uses
 #include <Arduino.h> #include <Arduino.h>
 #include <ittiot.h> #include <ittiot.h>
-#include <SPI.h> +#include <Adafruit_I2CDevice.h>
-#include <Wire.h>+
 #include <Adafruit_GFX.h> #include <Adafruit_GFX.h>
 #include <Adafruit_SSD1306.h> #include <Adafruit_SSD1306.h>
  
-// Change it according to the real name of the red IoT module where +#define WIFI_NAME "name" 
-// DHT shield is connected +#define WIFI_PASSWORD "password" 
-#define DHT_TOPIC "ESP53"+ 
 +// Change it according to the real name of the microcontroller where DHT shield is connected 
 +#define DHT_TOPIC "ESP30"
  
 // OLED reset pin is GPIO0 // OLED reset pin is GPIO0
Line 109: Line 126:
   if(topic == (DHT_TOPIC"/temp"))   if(topic == (DHT_TOPIC"/temp"))
   {   {
-    // Convert string to float +    t = msg.toFloat(); // Convert string to float
-    t = msg.toFloat();+
   }   }
  
Line 116: Line 132:
   if(topic == (DHT_TOPIC"/hum"))   if(topic == (DHT_TOPIC"/hum"))
   {   {
-    // Convert string to float +    h = msg.toFloat(); // Convert string to float
-    h = msg.toFloat();+
   }   }
 } }
Line 126: Line 141:
   // Send message to serial port to show that connection is established   // Send message to serial port to show that connection is established
   Serial.println("MQTT connected callback");   Serial.println("MQTT connected callback");
-  // Subscribe to get temperature and humidity messages+  // Subscribe to topics to get temperature and humidity messages
   iot.subscribe(DHT_TOPIC"/temp");   iot.subscribe(DHT_TOPIC"/temp");
   iot.subscribe(DHT_TOPIC"/hum");   iot.subscribe(DHT_TOPIC"/hum");
Line 136: Line 151:
 { {
   // Initialize serial port and send message   // Initialize serial port and send message
-  Serial.begin(115200);+  Serial.begin(115200); // setting up serial connection parameter
   Serial.println("Booting");   Serial.println("Booting");
  
Line 150: Line 165:
   display.display();   display.display();
  
-  // print IoT json config to serial +  //iot.setConfig("wname", WIFI_NAME); 
-  iot.printConfig(); +  //iot.setConfig("wpass", WIFI_PASSWORD); 
- +  iot.printConfig(); // print IoT json config to serial 
-  // Initialize IoT library +  iot.setup(); // Initialize IoT library
-  iot.setup();+
 } }
  
 void loop() void loop()
 { {
-  // IoT behind the plan work, it should be periodically called +  iot.handle();// IoT behind the plan work, it should be periodically called
-  iot.handle();+
  
-  // Display temperature and humidity readings to oLED screen +  // Display temperature and humidity readings to OLED screen 
-  display.clearDisplay(); +  display.clearDisplay(); // cleanse the OLED display 
-  display.setTextSize(1); +  display.setTextSize(1); // sets the text size 
-  display.setTextColor(WHITE); +  display.setTextColor(WHITE); // sets the text color 
-  display.setCursor(0,0); +  display.setCursor(0,0); // sets the cursor position 
-  display.println("Temp: "); +  display.println("Temp: "); // writes text 
-  display.println(t);+  display.println(t); // write temperature value
   display.setCursor(0,20);   display.setCursor(0,20);
   display.println("Hum: ");   display.println("Hum: ");
Line 174: Line 187:
   display.display();   display.display();
  
-  delay(200);+  delay(200); // Waiting 0.2 second
 } }
 +
 </code> </code>
en/iot/examples/dhtoled.1591808960.txt.gz · Last modified: 2020/07/20 09:00 (external edit)
CC Attribution-Share Alike 4.0 International
www.chimeric.de Valid CSS Driven by DokuWiki do yourself a favour and use a real browser - get firefox!! Recent changes RSS feed Valid XHTML 1.0