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--- en:iot:examples:relay [2017/09/29 10:42] – Somepub
+++ en:iot:examples:relay [Unknown date] (current) – external edit (Unknown date) 127.0.0.1
@@ Line 1: / Line 1: @@
-======  Relay ======
+======  Relay example======
-==== Theory ====
+Relay module must be connected to controller module or with sensor module.
+{{:en:iot:examples:relaypicture1.jpg?200|}}
+{{:en:iot:examples:relaypicture2.jpg?200|}}
-==== Practical ====
+Relay has 3 input holes.
-{{:en:iot:examples:22140098_1694388810595897_1795160093_o.jpg?300|}}
+{{:en:iot:examples:relaypicture3.jpg?200|}}
-{{:en:iot:examples:22095351_1694388900595888_713333330_o.jpg?300|}}
+Needed libraries:
+<code>lib_deps = ITTIoT</code>
+The example code below shows if something is connected to the relay module
-{{:en:iot:examples:22095615_1694389170595861_861241709_o.jpg?300|}}
 <code c>
+// Includes global variables and librarys that the relay shield uses
 #include <Arduino.h>
 #include <ittiot.h>
-#define RELAY_PIN 5
+#define MODULE_TOPIC "ESP30/relay"
+#define WIFI_NAME "name"
+#define WIFI_PASSWORD "password"
+#define RELAY_PIN 5 // The relay has been connected to pin 5 (D1)
 // If message received switch relay
@@ Line 29: / Line 33: @@
   Serial.print(" payload: ");
   Serial.println(msg);
-  if(msg == "1")
-  {
-    digitalWrite(RELAY_PIN, HIGH);
-  }
-  if(msg == "0")
+  if(topic == MODULE_TOPIC)
   {
-    digitalWrite(RELAY_PIN, LOW);
+    // If message received and it is 1, then switch relay on
+    if(msg == "1")
+    {
+      digitalWrite(RELAY_PIN, HIGH);
+    }
+    // If message received and it is 0, then switch relay on
+    if(msg == "0")
+    {
+      digitalWrite(RELAY_PIN, LOW);
+    }
   }
 }
+// Function started after the connection to the server is established.
 void iot_connected()
 {
   Serial.println("MQTT connected callback");
-  iot.subscribe("relay");
+  iot.subscribe(MODULE_TOPIC); // subscribe to topic relay
   iot.log("IoT relay example!");
 }
@@ Line 49: / Line 59: @@
 void setup()
 {
-  Serial.begin(115200);
+  Serial.begin(115200); // setting up serial connection parameter
   Serial.println("Booting");
+  //iot.setConfig("wname", WIFI_NAME);
+  //iot.setConfig("wpass", WIFI_PASSWORD);
+  iot.printConfig(); // print json config to serial
+  iot.setup(); // Initialize IoT library
-  iot.printConfig(); // print json config to serial //Peale Serial.begin ja enne iot.setup
+  pinMode(RELAY_PIN, OUTPUT); // The relay pin is defined as output type
-  iot.setup();
-  pinMode(RELAY_PIN, OUTPUT);
 }
 void loop()
 {
-  iot.handle();
+  iot.handle(); // IoT behind the plan work, it should be periodically called
-  delay(200);
+  delay(200); // Wait for 0.2 seconds
 }
 </code>

en/iot/examples/relay.1506681732.txt.gz · Last modified: 2020/07/20 09:00 (external edit)