WordClock-1 Assembly Guide 12/08/19 Version 1.2
Page 4
Insert the microcontroller, U2, into the headers aligning the direction of the USB
connector and the antenna with the marks on the board.
Step 2
– Build the Display Board
For ease of assembly, parts should be installed in the order noted here.
Install LED11-LED16. Follow the same procedure noted above to install surface mount
parts. The LEDs must be soldered quickly and carefully. Note the direction. Align the
angled corner with the mark on the board.
Install 470 ohm surface mount resistors at R6-R9. These resistors are used to equalize
the brightness between the display and colons. If a different color colon is used, this
value may have to be adjusted.
Install C9, the surface mount capacitor to the back of the display board.
Install J5, the 90 degree male connector, to the back of the display board. Solder one
pin first, then check the alignment to verify that the pins are parallel to the board.
Cut the silver tape into six pieces and stick to the back of each alphanumeric display,
LED1-LED6. Verify that the tape does not contact any of the pins. The displays are
somewhat translucent so backlighting will show through some segments without the
tape installed. Also,
the tape’s reflectivity will increase the visibility of the backlighting.
