Central unit:

modules:

1 i2c BME280 sensor
1 i2c DS3231 hw clock
UART connection with the Raspberry

micropython dependencies:

BME280.py
umqttsimple.py
ds3231_port

Pheriferal sensors:

modules:

1 i2c BME280 sensor micropython dependencies:
BME280.py
umqttsimple.py

Raspberry:

software:

Raspbian lite 32bit without desktop environment
Matchbox window manager
Nodered
Influxdb
Mosquitto
autoexec bash script from /etc/rc.local
feh and python script to control it for screensaver
chromium
unclutter

hardware

gpio buttons
hdmi display
optional usb drive to store influxdb data
UART connection with the main microcontroller