I’ve replaced an old dumb boiler monitor with a new one running on the Lilygo T-Display-S3. Since most of the effort was in the Tasmota side I’ve posted a big writeup in the the Tasmota GitHub ‘Show and Tell’ forum here. Go have a look.
Whilst you may not be intersted in your boiler there may be other things you would like to build a display for. This project write up will show you how to make use of Berry and HASPmota (and a little bit of LVGL) running on a Tasmotised ESP32 device. It shows how to display local sensor values and values sent to it from Home Assistant. It also shows how to calculate and send additional values to HA using MQTT, and 2 methods of setting up a timer. These were all things I struggled with initially, there being not many examples out there.
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