A Very Simple ESP-12 Demonstration for Sending and Receiving Data using MQTT Protocol

This project demonstrates a very simple implementation of ESP-12 to sending ADC reading and status, and receiving command from remote user through MQTT protocol. The sent data is just a floating ADC input reading and ADC reading status, and the received data from remote user is a command to enable/disable ADC reading.

Tested on Wemos D1 Mini and Arduino 1.8.9 IDE.

Dependencies

There are a few dependencies required:

• Arduino IDE
• ESP8266 Core for Arduino. Please follow the installation instruction.
• PubSubClient library. Personally, I am using this library.

Usage

• Please use your own username, password, and mqtt broker service, then put into:

  const char* brokerUser = "your_mqttBroker_username";
  const char* brokerPass = "your_mqttBroker_pass";
  const char* broker = "your_broker_server";
  

  personally, i am using mqtt.dioty.co for the broker server, so my username would be myemail@email.com. You can use another mqtt broker server.

• Put your WiFi credentials into:

  wifiMulti.addAP("ssid_from_AP_1", "your_password_for_AP_1");
  wifiMulti.addAP("ssid_from_AP_2", "your_password_for_AP_2");
  wifiMulti.addAP("ssid_from_AP_3", "your_password_for_AP_3");
  

  you can whether use only one SSID and password or all of them.

• ADC values are reported into the /out/adc topic and the AC statuses are reported into the /out/stat.
• ADC enabling/disabling commands are received from the /in topic.

In Action

Here, I am using the MQTT Dashboard Smartphone App to see the data and to control the Wemos D1 through MQTT protocol.

• First, we command the ADC to be disabled by sending 0 charachter into the /in/ topic. The effects are Wemos will report ADC disabled into /out/stat topic and ADC voltage into /into/adc topic.

• Then, we command the Wemos to enabling the ADC by sending 1 character into the /in/ topic.

TODO

• Optimize the code (there is a lot of room for improvements!!)
• Adding capabitilies for controlling another I/O ports.
• …

Contributing

1. Fork it https://github.com/handiko/ESP12-MQTT-IoT-Demo/fork
2. Create new branch (git checkout -b myfeature)
3. Do some editing / create new feature
4. Commit your works (git commit -m "Adding some feature blah blah blah..")
5. Push to the branch (git push -u origin myfeature)
6. Create a new Pull Request