Komplexně zpracovaný příklad na modul Olimex ESP32-POE s displayem, 3D tištěným držákem a firmwarem ESPEasy zpracoval mikrom a nechávám ho od něj v angličtině tak jak ho poslal.

Autor příkladu: https://mikrom.cz/
Kontakt na autora: mikrom@mikrom.cz

3D printed bracket and few computer screws (use brown paper insulated washers for ESP board!).
Model at Printables.com: https://www.printables.com/cs/model/414827-rack-environment-monitoring-bracket
Direct download: Model for print 3MF

https://github.com/letscontrolit/ESPEasy/releases

Just download and flash correct BIN file via micro-USB and do initial setup via the serial console:
ESP_Easy_mega_20221105_display_ESP32_4M316k_ETH.bin

Useful links:
https://www.letscontrolit.com/wiki/index.php/Tutorial_Rules
https://espeasy.readthedocs.io/en/latest/Rules/Rules.html
https://espeasy.readthedocs.io/en/latest/Reference/Command.html
https://www.letscontrolit.com/wiki/index.php/EasyNotifications

Do not forget to change YourAPHere and YourPasswordHere

# Factory reset
Reset

# Wifi (powered via USB it will connect to the wifi)
WifiSSID YourAPHere
WifiKey YourPasswordHere
WifiConnect

Now you should be able to connect vias the Wi-Fi and do the basic setup.

Set Generic HTTP controller where data will be sent:

Controller Hostname: domena-pro-zapis.tmep.cz
Controller Publish: /index.php?temp=[HTU#Temperature]&humV=[HTU#Humidity]

Set the correct GPIO for I2C and Ethernet

Add two devices. Environment sensor, and LCD2004 display. (You can use I2C Scanner under Tools tab to get correct addresses).

Only correct I2C address is needed here as we will control what is shown later in Rules.

Select correct I2C address, output data Temp / Hum.

Interval is very important – how often data will be measured (send to the controller, rules triggered)

With Formula, you can do a basic calibration.

Enable Rules here. You can also set a NTP server.

You can setup e-mail notifications here (or if you are using TMEP.cz/TMEP.eu portal, you can use them there).

Just use a standard values as for any SMTP:

Here some magic s done. Timer is used just for looping two screens on the display (Datetime, Temp, Hum / IP, MAC). Last two functions are for triggering notifications.

The code is pretty self-explanatory.

// https://www.letscontrolit.com/wiki/index.php/Tutorial_Rules
// https://espeasy.readthedocs.io/en/latest/Rules/Rules.html
// https://espeasy.readthedocs.io/en/latest/Reference/Command.html

// http://<espeasyip>/control?cmd=<command>

On System#Boot Do
  LoopTimerSet,1,10 // LoopTimerSet,<timernr>,<timeInSeconds>
Endon

On Rules#Timer=1 Do  // When Timer1 expires, do... => every 10s
  If [int#1]=0
    Let,1,1
    LCDCmd,clear

    LCD,1,1,"{substring:0:10:%lcltime%} %systm_hm%"
    LCD,2,1,"T:[HTU#Temperature]{D}C H:[HTU#Humidity]%"
  Else
    Let,1,0
    LCDCmd,clear

    LCD,1,1,"IP:%ip%"
    
    // Shorter the MAC address A8:03:2A:F8:AB:EC -> A8032AF8ABEC
LCD,2,1,"MAC:{substring:0:2:"%mac%"}{substring:3:5:"%mac%"}{substring:6:8:"%mac%"}{substring:9:11:"%mac%"}{substring:12:14:"%mac%"}{substring:15:17:"%mac%"}"

  Endif
Endon


On [HTU#Temperature]>25 Do
  Notify,1
Endon


On [HTU#Humidity]>40 Do
  Notify,1
Endon

I had to extend the rail 😊 (25° might sound little bit too high, but the AC is currently down)