First Commit

Original code as transcribed from the Gas Detectors project in the book
_Atmospheric Monitoring with Arduino_ by Patrick Di Justo.  Verified
and successfully compiled in Arduino IDE.  This version incorrectly
assigned the LCDIn and LCDOut pins, resulting in gibberish displayed on
the LCD screen.
Changed LCD pin assignments, var names, timers

Code successfully verified and compiled in Arduino IDE.

Switched the LCDIn and LCDOut pin assignments; now the LCD screen
receives input and displays text.

Renamed “mySerialPort” to “lcdPort” to make it more clear that the code
is referring to the LCD port.

Modified the warmup time so that I wouldn’t have to wait so long to
find out if the LCD is printing messages to the screen properly.

Changed some of the text to be displayed on the LCD. Commented out
SD-card-related code.

Changed the “downtime” timer equation to account for time lapsed during
the heater warmup periods and delay periods.

*** This code still did not properly print messages to the LCD screen:
lines of text overflowed onto the next line or become truncated. ***