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A PDF file describes how Excel was used to
generate Rao-type roast profiles and then
execute them by means of an Arduino Mega 2560
which transmits thermocouple temperature and
then receives Excel generated adjustments to
a stepper motor connected to the pulse width
modulator which sends power to the heating
coils of a modified Presto PopLite popcorn
popper. Excel workbooks and Arduino sketches
for ?C and ?F are included.