LCD Mode
LCD always on
LCD on for 30
seconds
LCD off
LCD behaviour on button press
Each button press changes the LCD, as per the diagram
The first press enables the LCD and displays the last logged
temperature. Each subsequent press changes the LCD, as
per the diagram. If the button is not pressed for 30 seconds,
the LCD disables and the logger returns to the beginning of
the display cycle
'Log' is displayed, to show that the logger is working. No data
is displayed in this mode
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