DOWN the column for the next colored LED, which will
be blue, then yellow, then red. Space each LED at 1.25”
(e.g., 1.25”, 2. 5”, 3. 75”, 4”, 5. 25”, 6. 5”, 7. 75”, 9”). Cut off
the excess anodes, and put a piece of tape on the finished
column with the #1 on it (Figure 5). Do the same for the
next wire, noting that the first LED is blue; label it #2. Do
the same for the remaining six columns.
Put column 1 into a vice with the LED pointing up.
Place the first ring with its first mark on the cathode and
bend the cathode up to hold the ring. Solder the cathode
to the ring. Continue for each ring until all of them are
Locate column 5 and mount it in the vice with the
LEDs pointing upward. Locate spoke 5 on the rings, which
will be 180 degrees from column 1. Thread the column
through the rings and solder the LEDs to the ring. This
procedure will give structure and will make it easier to
keep the form and symmetry of the cone (Figure 6).
Going clockwise from column 1 (looking from the
top), solder column 3 and column 7, then column 2 and
6, and finally columns 4 and 8. Re-solder any LEDs that
are out of alignment.
Cut the top wires off of columns 4, 5, 6, 7, and 8 to
their last LED. You should now have three wires from the
top of the cone. Cut an 11” green wire-wrap wire, wire
wrap it to the long LED lead (cathode), and solder. You
may have to cut it shorter so that the wire is next to the
LED. Going left to right, lead 1 is green, 2 is blue, 3 is the
cathode, and lead 4 is red.
Solder lead 1 from
the LED to column 1
so that the three-colored LED is in the
center of the cone as
the last layer of LEDs.
Solder LED 2 to
column 2 and lead 4
to column 3. Cut the
excess wires off.
Take the green
wire from the cathode
of the three-colored
LED and wrap one turn
between each LED on
column 8. Leave about
1” below the column
wire for soldering to
Locate column 1
and solder a green
wire to ring 1, then
wrap one turn around
column 1 with 1”
below the column.
Using column 2/ring 2,
solder a green wire. Continue to ring 7, wrapping one turn
around the columns between the LEDs. Refer to Figure 7.
December 2014 35
■ FIGURE 5.
■ FIGURE 6.
ITEM DESCRIPTION MODEL QTY SOURCE
BH Battery holder 3 AA 534-2465 1 Mouser
C1 .1 µF 594-K104K15X7RF5UH5 1 Mouser
C2 10 µF 581-TAP106K016CRW 1 Mouser
IC1 Proximity sensor RB-LTE-116 1 Robot Shop
Mic Microphone 665-AOM4546PNFR 1 Mouser
LED 1 Red 859-LTL353QRKNN 14 Mouser
LED 2 Amber LTL2R3F859-LTL2R3YW3KSV3KS 14 Mouser
LED 3 Green 859-LTL3H3TGUADS1 14 Mouser
LED 4 Blue 859-LTL2P3TBU2KS 14 Mouser
LED 5 Multicolored common cathode RL5-RGB-DCC 1 SuperBrightLEDs
R1-R8 220 ohm 1/4 watt 291-220-RC 8 Mouser
R9-R17 10K 1/4 watt 291-10K-RC 9 Mouser
R18 100K 1/4 watt 291-100K-RC 1 Mouser
R19 10 pot 652-3309P-1-103 1 Mouser
R20 1 meg 1/4 watt 291-1M-RC 1 Mouser
R21 27K 1/4 watt 291-27K-RC 1 Mouser
Screws 2-56 x 3/4" 534-9357 2 Mouser
Socket Socket 28-pin 526248 1 Jameco
Standoff 3/8" 2-56 761-1111-2-N 2 Jameco
SW1 On-Off 612-EG1218 1 Mouser
SW2 Momentary switch 612-TL1105-250 1 Mouser
U1 PIC16F916 PIC16F916-I/SP 1 Mouser
U2 Op-amp 579-MCP601-E/SN 1 Mouser
U3-U10 NPN transistor 512-PN222ATF 8 Mouser
Wire 18 bus 2098507, 12' Jameco
Wire Green wire wrap 22606, 10' Jameco