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Vorlage.ino

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+/*
+ * Rui Santos 
+ * Complete Project Details https://randomnerdtutorials.com
+ */
+
+#include "Nextion.h"
+
+#include "DHT.h"
+#define DHTPIN 4     // what digital pin we're connected to
+
+// Uncomment whatever type you're using!
+#define DHTTYPE DHT11   // DHT 11
+//#define DHTTYPE DHT22   // DHT 22  (AM2302), AM2321
+//#define DHTTYPE DHT21   // DHT 21 (AM2301)
+
+// Initialize DHT sensor.
+DHT dht(DHTPIN, DHTTYPE);
+
+// LED pins
+const int led1 = 8;
+const int led2 = 9;
+
+// Declare your Nextion objects - Example (page id = 0, component id = 1, component name = "b0") 
+NexText tState = NexText(0, 4, "tState"); 
+NexButton bOn = NexButton(0, 2, "bOn");
+NexButton bOff = NexButton(0, 3, "bOff");
+NexSlider h0 = NexSlider(0, 5, "h0");
+NexText tSlider = NexText(0, 6, "tSlider");
+NexText tTempC = NexText(1, 5, "tTempC");
+NexText tTempF = NexText(1, 4, "tTempF");
+NexProgressBar jHumidity = NexProgressBar(1, 8, "jHumidity");
+NexText tHumidity = NexText(1, 9, "tHumidity");
+NexButton bUpdate = NexButton(1,10, "bUpdate");
+
+// Register a button object to the touch event list.  
+NexTouch *nex_listen_list[] = {
+  &bOn,
+  &bOff,
+  &h0,
+  &bUpdate,
+  NULL
+};
+ 
+/*
+ * Button bOn component pop callback function. 
+ * When the ON button is released, the LED turns on and the state text changes. 
+ */
+void bOnPopCallback(void *ptr) {
+  tState.setText("State: on");
+  digitalWrite(led1, HIGH);
+}
+
+/*
+ * Button bOff component pop callback function. 
+ * When the OFF button is released, the LED turns off and the state text changes. 
+ */
+void bOffPopCallback(void *ptr) {
+  tState.setText("State: off");
+  digitalWrite(led1, LOW);
+}
+
+/*
+ * Slider h0 component pop callback function. 
+ * When the slider is released, the LED brightness changes and the slider text changes. 
+ */
+void h0PopCallback(void *ptr) {
+  uint32_t number = 0;
+  char temp[10] = {0};
+  // change text with the current slider value
+  h0.getValue(&number);
+  utoa(number, temp, 10);
+  tSlider.setText(temp);
+  // change LED brightness
+  analogWrite(led2, number); 
+}
+
+/*
+ * Button bUpdate component pop callback function. 
+ * When the UPDATE button is released, the temperature and humidity readings are updated. 
+ */
+void bUpdatePopCallback(void *ptr) {
+  // Reading temperature or humidity takes about 250 milliseconds!
+  // Sensor readings may also be up to 2 seconds 'old' (its a very slow sensor)
+  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)) {
+    return;
+  }
+  // Update temperature in Celsius
+  static char temperatureCTemp[6];
+  dtostrf(t, 6, 2, temperatureCTemp);
+  tTempC.setText(temperatureCTemp);
+
+  // Update humidity percentage text and progress bar
+  char hTemp[10] = {0}; 
+  utoa(int(h), hTemp, 10);
+  tHumidity.setText(hTemp);
+  jHumidity.setValue(int(h));
+
+  // Update temperature in Fahrenheit
+  static char temperatureFTemp[6];
+  dtostrf(f, 6, 2, temperatureFTemp);
+  tTempF.setText(temperatureFTemp);
+}
+
+void setup(void) {    
+  dht.begin();
+  Serial.begin(9600);
+    
+  // You might need to change NexConfig.h file in your ITEADLIB_Arduino_Nextion folder
+  // Set the baudrate which is for debug and communicate with Nextion screen
+  nexInit();
+
+  // Register the pop event callback function of the components
+  bOn.attachPop(bOnPopCallback, &bOn);
+  bOff.attachPop(bOffPopCallback, &bOff);
+  h0.attachPop(h0PopCallback);
+  bUpdate.attachPop(bUpdatePopCallback, &bUpdate);
+    
+  // Set LEDs as outputs
+  pinMode(led1, OUTPUT);
+  pinMode(led2, OUTPUT);
+}
+
+void loop(void) {   
+  /*
+   * When a pop or push event occured every time,
+   * the corresponding component[right page id and component id] in touch event list will be asked.
+   */
+  nexLoop(nex_listen_list);
+}

withLibrary.ino

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+
+#include "Nextion.h"
+
+// LED pins
+const int led1 = 8;
+const int led2 = 9;
+
+// Declare your Nextion objects - Example (page id = 0, component id = 1, component name = "b0") 
+NexText tState = NexText(0, 4, "tState"); 
+NexButton bOn = NexButton(0, 2, "bOn");
+NexButton bOff = NexButton(0, 3, "bOff");
+NexSlider h0 = NexSlider(0, 5, "h0");
+NexText tSlider = NexText(0, 6, "tSlider");
+NexText tTempC = NexText(1, 5, "tTempC");
+NexText tTempF = NexText(1, 4, "tTempF");
+NexProgressBar jHumidity = NexProgressBar(1, 8, "jHumidity");
+NexText tHumidity = NexText(1, 9, "tHumidity");
+NexButton bUpdate = NexButton(1,10, "bUpdate");
+
+// Register a button object to the touch event list.  
+NexTouch *nex_listen_list[] = {
+  &bOn,
+  &bOff,
+  &h0,
+  &bUpdate,
+  NULL
+};
+ 
+/*
+ * Button bOn component pop callback function. 
+ * When the ON button is released, the LED turns on and the state text changes. 
+ */
+void bOnPopCallback(void *ptr) {
+  tState.setText("State: on");
+  digitalWrite(led1, HIGH);
+}
+
+/*
+ * Button bOff component pop callback function. 
+ * When the OFF button is released, the LED turns off and the state text changes. 
+ */
+void bOffPopCallback(void *ptr) {
+  tState.setText("State: off");
+  digitalWrite(led1, LOW);
+}
+
+/*
+ * Slider h0 component pop callback function. 
+ * When the slider is released, the LED brightness changes and the slider text changes. 
+ */
+void h0PopCallback(void *ptr) {
+  uint32_t number = 0;
+  char temp[10] = {0};
+  // change text with the current slider value
+  h0.getValue(&number);
+  utoa(number, temp, 10);
+  tSlider.setText(temp);
+  // change LED brightness
+  analogWrite(led2, number); 
+}
+
+/*
+ * Button bUpdate component pop callback function. 
+ * When the UPDATE button is released, the temperature and humidity readings are updated. 
+ */
+void bUpdatePopCallback(void *ptr) {
+  // Reading temperature or humidity takes about 250 milliseconds!
+  // Sensor readings may also be up to 2 seconds 'old' (its a very slow sensor)
+  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)) {
+    return;
+  }
+  // Update temperature in Celsius
+  static char temperatureCTemp[6];
+  dtostrf(t, 6, 2, temperatureCTemp);
+  tTempC.setText(temperatureCTemp);
+
+  // Update humidity percentage text and progress bar
+  char hTemp[10] = {0}; 
+  utoa(int(h), hTemp, 10);
+  tHumidity.setText(hTemp);
+  jHumidity.setValue(int(h));
+
+  // Update temperature in Fahrenheit
+  static char temperatureFTemp[6];
+  dtostrf(f, 6, 2, temperatureFTemp);
+  tTempF.setText(temperatureFTemp);
+}
+
+void setup(void) {    
+  dht.begin();
+  Serial.begin(9600);
+    
+  // You might need to change NexConfig.h file in your ITEADLIB_Arduino_Nextion folder
+  // Set the baudrate which is for debug and communicate with Nextion screen
+  nexInit();
+
+  // Register the pop event callback function of the components
+  bOn.attachPop(bOnPopCallback, &bOn);
+  bOff.attachPop(bOffPopCallback, &bOff);
+  h0.attachPop(h0PopCallback);
+  bUpdate.attachPop(bUpdatePopCallback, &bUpdate);
+    
+  // Set LEDs as outputs
+  pinMode(led1, OUTPUT);
+  pinMode(led2, OUTPUT);
+}
+
+void loop(void) {   
+  /*
+   * When a pop or push event occured every time,
+   * the corresponding component[right page id and component id] in touch event list will be asked.
+   */
+  nexLoop(nex_listen_list);
+}