Project requires an IOT cloud. LED 's are turned ON before using the switch from Ubidots, my goal is to control the led's using switch from Ubidots

Other Hardware Sensors
1 



#include <WiFi.h>
#include <PubSubClient.h>


#define WIFISSID "" // Put your WifiSSID here
#define PASSWORD "" // Put your wifi password here
#define TOKEN "" // Put your Ubidots' TOKEN
#define MQTT_CLIENT_NAME "" 

#define VARIABLE_LABEL "led_1"
#define VARIABLE_LABEL_SUBSCRIBE "led_2"
#define DEVICE_LABEL "esp32" // Assig the device label

#define led_1 26
#define led_2 27 


char mqttBroker[]  = "things.ubidots.com";
char payload[100];
char topic[150];
char topicSubscribe[100];
// Space to store values to send

/****************************************
 * Auxiliar Functions
 ****************************************/
WiFiClient ubidots;
PubSubClient client(ubidots);



void reconnect() {
  // Loop until we're reconnected
  while (!client.connected()) 
  {
    Serial.println("Attempting MQTT connection...");
    
    // Attemp to connect
    if (client.connect(MQTT_CLIENT_NAME, TOKEN, "")) 
    {
      Serial.println("Connected");
      client.subscribe(topicSubscribe);
    } 
    else 
    {
      Serial.print("Failed, rc=");
      Serial.print(client.state());
      Serial.println(" try again in 2 seconds");
      // Wait 2 seconds before retrying
      delay(2000);
    }
  }
}
void callback(char* topic, byte* payload, unsigned int length) {
  char p[length + 1];
  memcpy(p, payload, length);
  p[length] = NULL;
  
  String message(p);
  if (message == "0") 
  {
    //Serial.println("BOTH  LED's are OFF");
    digitalWrite(led_1,LOW);
    digitalWrite(led_2,LOW);
    
  }
  if(message == "1")
  {
     digitalWrite(led_1, HIGH);
     digitalWrite(led_2,HIGH);
  }
  
 
  Serial.write(payload, length);
  Serial.println();
}

void setup() 
{
  Serial.begin(115200);
  WiFi.begin(WIFISSID, PASSWORD);
  pinMode(led_1, OUTPUT);
  pinMode(led_2, OUTPUT);

  Serial.println();
  Serial.print("Wait for WiFi...");
  
  while (WiFi.status() != WL_CONNECTED) 
  {
    Serial.print(".");
    delay(500);
  }
  Serial.println("");
  Serial.println("WiFi Connected");
  Serial.println("IP address: ");
  Serial.println(WiFi.localIP());
  client.setServer(mqttBroker, 1883);
  client.setCallback(callback);

  sprintf(topicSubscribe, "/v1.6/devices/%s/%s/lv", DEVICE_LABEL, VARIABLE_LABEL);
  sprintf(topicSubscribe, "/v1.6/devices/%s/%s/lv", DEVICE_LABEL, VARIABLE_LABEL_SUBSCRIBE);
  
  client.subscribe(topicSubscribe);
}



void loop() {
  // put your main code here, to run repeatedly:
  if (!client.connected()) {
    client.subscribe(topicSubscribe);   
    reconnect();
  }

  /*if (led_1==1 && led_2==1)
  {
    digitalWrite(led_1, HIGH);
    digitalWrite(led_2, HIGH);
  }
  else
  {
    digitalWrite(led_1, LOW);
    digitalWrite(led_2, LOW);
  }*/
  
 
  

  sprintf(topic, "%s%s", "/v1.6/devices/", DEVICE_LABEL);
  sprintf(payload, "%s", ""); // Cleans the payload
  sprintf(payload, "{\"%s\":", VARIABLE_LABEL); // Adds the variable label
  sprintf(payload, "{\"%s\":", VARIABLE_LABEL_SUBSCRIBE);
  
  
  //Serial.println("Publishing data to Ubidots Cloud");
  client.publish(topic, payload);
  client.loop();
  delay(1000);
}
2

Post a wiring diagram of your setup and a link to the manual of that service you're using!

I doubt that the payload for the device registration is correct.

3

Are you referring Service to Ubidots?

About the wiring diagram I have connected two LED's to GPIO 26 and 27 via 333 ohm and 220 ohm. LED working is fine,but the problem is it is turned on before the ON button is pressed from Ubidots. Not sure about the payload.

4

Yes. It seems that you need to register your device on the service and we have to know what exact format that registration uses.

That's not a wiring diagram. Does the LED go to GND or to VCC? Draw a complete wiring diagram (may be hand-drawn) and post it here!

6

LED anode goes to GND.

7

I didn't get your question correctly regarding ubidots.

8

Post a link to the manual of that service! That's a description of how that service works. We cannot help you without that.

9

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