I already owned a HD44780 I2C Display, which is compatible to LCDd/lcdproc, and want to get this running with Tasmota.
Problem: The LCD 2004 or LCD 1602 Display, for which the Tasmota LCD driver was written, uses a different wiring between the i2c expander (PCF8574) and the HD44780 Display.
Continue reading Tasmota: Connect a lcdproc/LCDd compatible HD44780 i2c Display
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if you want to use Conditional Rules in tasmota you have to built your own firmware, because Conditional Rules are not included in the precomplied binaries.
Continue reading Tasmota: Build your own tasmota firmware
these steps describes how to install Tasmota on Shelly Smart Home WIFI/WLAN relay.
First you need a the flash tool esptool. Simplest way is to install the python module. This is the same way on linux and windows
Continue reading Tasmota: Flashing and setup a Shelly 2.5