Some advices for the system

Setup, Configuration and Use Beginners
,
1

I’m begginner and I would like a system using a Raspberry and Arduino.

Is it possible?

  • Client send data to Web Server by a browser;
  • Web Server (Raspberry Pi running openHAB) which connect with Arduino;
  • Arduino control the sensors;

How is the connection between arduino and rasp? MQTT?
Can someone give me tips or tutorials?

2

Well, for MQTT the arduino needs to have WLAN/LAN access to the MQTT broker.
This would be possible for ESP8266 and ESP32 and e.g. the pubsubclient library.
But an Arduino doesn’t have a Ethernet or WiFi chip.

So what kind of arduino are you using?

3

Im using arduino mega 2560 r3 and ESP8267 12E.

4

Fine, so you just need to connect the ESP to your WiFi and setup e.g. pubsubclient (https://github.com/knolleary/pubsubclient).
Now you can send and receive MQTT messages with your ESP.

Make sure to read the OpenHab MQTT Binding documentation as well:
https://docs.openhab.org/addons/bindings/mqtt1/readme.html

For a quick start, i would create a simple item that displays a text on your sitemap. This item subscribes to a MQTT topic which is sent to your MQTT Broker from the ESP.

5

Thank you so much.
I’m gonna try.