Here is a quick guide to build temperature and humidity sensor using Wemos D1 mini development board+Tasmota Firmware, DHT22 sensor, 16x2 LCD screen. 

Tasmota Wemos D1 Mini DHT22 Temp/humidity Sensor

 

<<Displays temperature /humidity value to LCD and into web page/IP address

 

 

Parts You need:

 

-Wemos D1 Mini

-Breadboard (bigger if You want all parts to fit)

-DHT22 Sensor

-Arduino I2C Backpack

-LCD Screen 16x2

-Micro USB cable

-wiring cables

 

Flashing Software:

 

- Tasmota-PyFlasher-1.0

https://github.com/tasmota/tasmota-pyflasher/releases

 

Firmware file:

 

-sonoff-display.bin

https://github.com/arendst/Tasmota/releases

 

 

How to configure Sensors in Tasmota:

https://github.com/arendst/Tasmota/wiki/components

 

 

How to configure LCD screen:

https://github.com/arendst/Tasmota/wiki/displays

 

AND.. Console Commands:

https://github.com/arendst/Tasmota/wiki/commands#displays