Tutorial OpenHAB Switch

This tutorial will guide you to connect your first ESP Easy to OpenHAB to control a digital output on the ESP (i.e. to drive a relay). We expect that you have a working OpenHAB setup, a MQTT broker running and have loaded the ESP Easy firmware onto your ESP.

In this tutorial, we use a simple switch demonstration so you don't need a real sensor attached to your ESP. A barebone ESP-01 should be sufficient for this tutorial. It will mainly demonstrate the basis steps to connect ESP to OpenHAB by using the ESP Easy firmware.

Get MQTT working

To be able to communicate with devices like the ESP, we have to get MQTT support into OpenHAB. This step has to be done only once in your setup.

We have used the Demo on OpenHAB to develop this support and we will be using that as a start.

In case MQTT is not setup already, please change the openhab.cfg file:

mqtt:localbroker.url=tcp://192.168.0.8:1883
mqtt:localbroker.clientId=openHAB

We had our broker service running on 192.168.0.8, please change to your local situation.

add the MQTT binding file

If not done already, add the MQTT binding jar to the addon folder. We added this file:

org.openhab.binding.mqtt-1.7.1.jar

Change sitemap

We added the following to the demo sitemap:

sitemap TestSiteMap label="Test Site-Map" { Frame label="MQTT Test"{ Switch item=MQTTLED label="LED" } }

Change items

Add following line to your items file:

Switch MQTTLED {mqtt=">[localbroker:/openhabdemo/gpio/2:command:ON:1],>[localbroker:/openhabdemo/gpio/2:command:OFF:0]"}

Connect the ESP Easy to your network

If you have your ESP board loaded with ESP Easy firmware, powerup the unit and an Access point named "ESP_0" should appear. Connect to this access point and browse to http://192.168.4.1. If all went well, the following screen should be shown:

Click the "Config" button

Configure at least the following settings to get you started:

SSID
WPA
Protocol Domoticz HTTP
Controller IP = your MQTT Broker IP
Controller Port = your MQTT broker server port, default should be 1883

Click the "Submit" button

Click the "Tools" button and Click "Connect"

Go back to "Main" and chech the status. It should have an IP address:

From here on, you should start using http://192.168.0.232 to connect to your ESP device.

Configure the ESP Easy Devices

Click the "Devices" button

Click the "Edit" button on the first row

Select "Switch Input" and enter the IDX found earlier in Domoticz. In our demo it was 250.

click "Submit" to get additional settings for this device

This should be the final result:

Testing

Now toggle GPIO-0 pin high and low and the light bulb in Domoticz should turn on/off accordingly!

(if you're using a NodeMCU board, you just have to toggle the "flash" button)