Arduino programs for Amateur Radio Direction Finding Transmitter control
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Sept 17/15

The programs in codppmx_ show a progression of refinements in developing a
controller based on the ATtiny85 microcontroller IC. The 'final' result is
in codppmx8. The codppmx..codppmx7 are included only for illustrative purposes
and show the various considerations that went into the development. These
considerations are further described in codppmReadMe.txt.

The program condev2 has most of the features of codppmx8, but it is meant to
be run in a complete standard arduino system where program development can
proceed much faster than it can with the ATtiny85 arduino variant. If one 
wanted to make major structural changes to the controller code, it would be
best tested out on condev2, then moved over to the ATtiny85 when debugged.

The utility program text2code is meant for preparation of an intel-hex format
file for loading into the ATtiny85 eeprom. The eeprom contents for codppmx8
now determine which transmitter ID (of MOE, MOI, MOS, MOH, or MO5) the 
controller generates, as well as a callsign to be inserted at 30 minute
intervals. This program is not strictly needed--the Morse code format of
the eeprom contents is fairly simple, and could be entered manually directly
into whatever programmer is used to flash the ATtiny85.

codppmx8.hex is a hex file of the arduino build of codppmx8. It is provided
so that the arduino development environment is not needed if one only wants
to use the controller software as-is.

