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NodeMCU has analog input WITH voltage devider!
0 - Vdd (3,3V)
login background:
gksudo leafpad /etc/lightdm/lightdm-gtk-greeter.conf
background= ... image or hex color (#000000)
autologin:
gksudo leafpad /etc/lightdm/lightdm.conf
[SeatDefaults]
autologin-user=
boot menu, rememeber last selection:
sudo nano /etc/default/grub
GRUB_DEFAULT=saved
GRUB_SAVEDEFAULT=true
sudo update-grub
