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--- en:iot:examples:buzzer [2018/02/27 14:37] – created Somepub
+++ en:iot:examples:buzzer [2024/03/12 16:19] (current) – heiko.pikner
@@ Line 1: / Line 1: @@
 ====== Buzzer example ======
+{{:en:iot:examples:soundmodule.png?200|}}
+Needed libraries:
+<code>lib_deps = ITTIoT, gmarty2000/Buzzer@^1.0.0</code>
+The code below will alert the buzz sound when values have been submitted by the mqtt server
+<code c>
+/*
+ * IoT Buzzer example
+ *
+ * This example subscribe to the "buzzer" topic. When a message received, then it
+ * will make a sound
+ *
+ * Created 02 Febrary 2018 by Heiko Pikner
+ */
+// Includes global variables and librarys that the Buzzer uses
+#include <Arduino.h>
+#include <ittiot.h>
+#include <Buzzer.h>
+#define MODULE_TOPIC "ESP30/buzzer"
+#define WIFI_NAME "name"
+#define WIFI_PASSWORD "password"
+//Pin definition for the buzzer (GPIO15)
+#define BUZZER_PIN D8
+Buzzer buzzer(BUZZER_PIN);
+// Splitting string into smaller parts, so that the sound level and length can be read out
+// https://stackoverflow.com/questions/9072320/split-string-into-string-array
+String getValue(String data, char separator, int index)
+{
+  int found = 0;
+  int strIndex[] = {0, -1};
+  int maxIndex = data.length()-1;
+  for(int i=0; i<=maxIndex && found<=index; i++)
+  {
+    if(data.charAt(i)==separator || i==maxIndex)
+    {
+        found++;
+        strIndex[0] = strIndex[1]+1;
+        strIndex[1] = (i == maxIndex) ? i+1 : i;
+    }
+  }
+  return found>index ? data.substring(strIndex[0], strIndex[1]) : "";
+}
+// If message received sound the buzz. For example:
+// mosquitto_pub -u test -P test -t "ITT/IOT/3/buzzer" -m "49;100"
+// The first message is the pitch(integer between 1-8191) and the second message is the duration
+void iot_received(String topic, String msg)
+{
+  Serial.print("MSG FROM USER callback, topic: ");
+  Serial.print(topic);
+  Serial.print(" payload: ");
+  Serial.println(msg);
+  if(topic == MODULE_TOPIC)
+  {
+    String Note = getValue(msg,';',0);
+    String time = getValue(msg,';',1);
+    buzzer.sound(Note.toInt(),time.toInt());
+  }
+}
+// Function started after the connection to the server is established.
+void iot_connected()
+{
+  Serial.println("MQTT connected callback");
+  // Subscribe to the topic "buzzer"
+  iot.subscribe(MODULE_TOPIC);
+  iot.log("IoT buzzer example!");
+}
+void setup()
+{
+  Serial.begin(115200); // setting up serial connection parameter
+  Serial.println("Booting");
+  //iot.setConfig("wname", WIFI_NAME);
+  //iot.setConfig("wpass", WIFI_PASSWORD);
+  // Print json config to serial
+  iot.printConfig();
+  // Initialize IoT library
+  iot.setup();
+}
+//Main code, which runs in loop
+void loop()
+{
+  // IoT behind the plan work, it should be periodically called
+  iot.handle();
+  delay(200); // Wait for 0.2 second
+}
+</code>

en/iot/examples/buzzer.1519742236.txt.gz · Last modified: 2020/07/20 09:00 (external edit)