Solder the LED. Its anode (long wire) goes to the square
hole. Place a small drop of solder on the center square of
the battery holder for contact of the battery. Solder the
battery holder next, and then the switches. The badge
uses a 12 mm lithium battery (CR1225).
The badge operates the same as the candle. When
the IR detector senses the IR, it brings the positive voltage
to ground. The LED then turns on and the micro generates
a 4 kHz square wave which causes the piezo buzzer to
squeal. Check out Figure 7.
Several counters are used to generate the sound and
the number of pulses indicating the number of hits.
A safety pin clip is glued to the back of the board so
that it can be placed over the heart of the player. Glue
some felt to the back to prevent it from snagging clothing
by the leads.
Insert the batteries into the wand, candle, and the
badge. Turn on the switches.
Two players: The game is played indoors and in
subdued light. (Florescent lights can cause false readings.)
Each player pins a badge over their heart and has a wand.
They can be back to back, take 10 paces, and fire, or they
can just face each other and count down. When the IR
hits the IR detector, the badge will light and emit a sound.
This scores one point. (See www.youtube.com/
watch?v=vEPhYhKdJ7k to view the Harry Potter and
Single player: The candles can be used as a target to
improve the player’s accuracy. Also, the player can stand
in front of a mirror with their badge and practice hitting
their own badge. Happy Wizardry! NV
PCBs, programmed MCUs and Wands to go with
this article can be purchased online from the
Nuts & Volts Webstore www.nutsvolts.com
or call our order desk at 800-783-4624.
GIZMOS THAT BRING YOUR DREAMS TO LIFE!
1000’s of LED’s in stock
1.8mm, 3mm, 5mm,
and 10mm from $. 40
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1 watt Stars $3.60
UV, IR, Surface Mount
3 watt LED strip $10.00
Not just bright… Stupid Bright!!
Noritake Vacuum Fluorescent Display
Regular $50 now $25.00 each
Works with all micros and arduino
Robot Kits Are Here:
expandable, and modifiable.
Great for kids age 10 and up
With student workbook.
Starting at $95
Ask about school discounts
Atmel STK500 USB
ISP programmer $38
RGB LED Strips
12v LED Bars
Graphic and Character Basic robot animal
kits start at $25
Head Lamp $11.95
7 Inch Lamp $19.95
Dynamo Lamp $21.95
Let that light shine in the
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