Construction:

Microcontroller, crystal, voltage regulator and bypass capacitor
are all per standard DT-104.
The 5V filter capacitor, the LEDs and the LED series resistors
are peculiar to this project.




Initialization:

Programming a 1200 with the hex file will also erase the EEPROM
and implicitly set the elapsed time to 9999.9 hours, so
as the device begins normal operation upon completion of
programming the yellow LED will be ON steadily.






