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--- en:iot:examples:relay [2017/09/29 13:41] – Somepub
+++ en:iot:examples:relay [Unknown date] (current) – external edit (Unknown date) 127.0.0.1
@@ Line 1: / Line 1: @@
+======  Relay example======
+Relay module must be connected to controller module or with sensor module.
+{{:en:iot:examples:relaypicture1.jpg?200|}}
+{{:en:iot:examples:relaypicture2.jpg?200|}}
+Relay has 3 input holes.
+{{:en:iot:examples:relaypicture3.jpg?200|}}
+Needed libraries:
+<code>lib_deps = ITTIoT</code>
+The example code below shows if something is connected to the relay module
+<code c>
+// Includes global variables and librarys that the relay shield uses
+#include <Arduino.h>
+#include <ittiot.h>
+#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
+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)
+  {
+    // 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(MODULE_TOPIC); // subscribe to topic relay
+  iot.log("IoT relay example!");
+}
+void setup()
+{
+  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
+  pinMode(RELAY_PIN, OUTPUT); // The relay pin is defined as output type
+}
+void loop()
+{
+  iot.handle(); // IoT behind the plan work, it should be periodically called
+  delay(200); // Wait for 0.2 seconds
+}
+</code>