from Sparkfun.com:
(4) Super Bright LED-(white) 10,000 MCD
    #COM-00531  3.4v  20ma
(1) Super Bright LED (red)-  10,000 MCD
    #COM-00528  2.4v  20ma
(1) Super Bright LED (green)-10,000 MCD
    #COM-08285  3.4v  20ma
(2) Break Away headers-
   (straight)  #PRT-00116

from Radio Shack:
Resistors 1/4 watt:
   (4) 100 ohm   (4) 120 ohm
   (1) 220 ohm   (1) 820 ohm  
   (1) 1K ohm    (6) 15K ohm 
  
(1) Hook-Up Wire-  
    (or Cat5 wire can be used)
(2) Green LED with Mounting-
    (2 per pack) #276-069
    (lane indicators)
(1) Yellow LED- 2.1v 20ma
    #276-0350 (start gate status)
(1) Roller Lever Switch-
    #275-0017 (start gate)
(1) Component PC Board-
    #276-168  (breadboard)
(1) Component Plastic Box-
    #270-1805  6" x 3" x 2"
    (larger Box #270-1806)
(1) LED Holders- (plastic snap-in)
    #276-0079
(1) Panel Mount LED Holder-
    (2 per pack) #276-080
    (status indicators)
(1 pkg) Standoffs- (for breadboard)
    #276-1381
(4) Infrared Transistor-
    #276-0145
(2) D-Sub Hood 9-pin-
    (male/female plastic)
   
#276-1513    
(2) D-Sub Connector 9-pin-
    (female) #276-1538
(2) D-Sub Connector 9-pin-
    (male)   #276-1537
(1) Mono 1/8" Male Audio Jack
    (solder type) #274-0287
(1) Mono 1/8" Female Audio Jack
    #274-251
(1 pkg) Hex Nuts 4-40 #64-3018
(1 pkg) Screws 4-40   #64-3011
(1) Solder- #64-009              
(1 pkg) Heat Shrink   #278-1610
    (3/64" is needed for Cat5
    wire-your size depends on
    wire ga. used
)
(1) 20' roll Speaker Wire- 24 ga.
    (for start switch)
    #278-1509 (or 2-conductor
    phone wire)
 
Other:
(1) Pre-programmed
    MicroController Chip
    (
included with order)
(1) A male to Mini-B male USB Cable
    (10-foot max)
(1) CAT-5 Wire approx.- 65' needed
    (this can also be used for
    all your hook-up wire
)

Tower Materials:
(1) 1-1/2" x 1-1/2" x 8'
   Aluminum Angle
   (approx. 4' needed)
   (got Metal from Lowe's)
(1) 1" x 1" aluminum side
   Posts (approx. 2' needed)
   (got Metal from Lowe's)
   Bolts for Tower-
   (length depends on
   material used for tower
)
(2) Metal 3" x 3" 'L' Brackets
   (mounting tower to track)
3/8" x 12" All-Thread brass
   tubing lamp material
  
(for mounting sensors
   and overhead LED's
)

(4 pkg) All-Thread Nuts and Washers
   (can be found at Lowe's #046935)
(2 pkg) Cork Plugs-
   (can be found at Lowe's
   #00  5/16" x 7/32"
   H#881310
)
(2 pkg) Cork Plugs-
   (found at Lowe's #0)

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Parts Info
Your price for materials is really based upon what you use, where you buy it and if you substitute parts. It also depends on how elaborate you want your product to look. These parts listed are what I used and are just recommendations. I am sure there are some short-cuts that can be taken. Remember any electrical components substituted might change your resistance values.
Parts List -
(Build Yourself)
Print Parts List
 from Sparkfun.com:
(4) Super Bright LED (white)   10,000 MCD  #COM-00531  3.4v  20ma    
(1) Super Bright LED (red)     10,000 MCD  #COM-00528  2.4v  20ma   
(1) Super Bright LED (green)   10,000 MCD  #COM-08285  3.4v  20ma
(2) Break Away headers (straight)  #PRT-00116

 
from Radio Shack:
Resistors 1/4 watt:
   (4) 100 ohm 
   (4) 120 ohm
   (1) 220 ohm 
   (1) 820 ohm  
   (1) 1K ohm 
   (6) 15K ohm    
(1) Hook-Up Wire   (or Cat5 wire can be used)              
(2) Green LED with Mounting (2 per pack) #276-069 (lane indicators)  
(1) Yellow LED 2.1v 20ma  #276-0350 (start gate status)
(1) Roller Lever Switch   #275-0017 (start gate)    
(1) Component PC Board    #276-168  (breadboard)    
(1) Component Plastic Box  #270-1805  6" x 3" x 2" (or larger #270-1806)    
(1) LED Holders (plastic snap-in)  #276-0079        
(1) Panel Mount LED Holder (2 per pack) #276-080 (status indicators)   
(1 pkg) Standoffs  (for breadboard) #276-1381   
(4) Infrared Phototransistor #276-0145
(2) D-Sub Hood 9-pin (male/female) plastic- #276-1513    
(2) D-Sub Connector 9-pin (female) #276-1538  
(2) D-Sub Connector 9-pin (male)   #276-1537    
(1) Mono 1/8" Male Audio Jack (solder type) #274-0287   
(1) Mono 1/8" Female Audio Jack #274-251
(1 pkg) Hex Nuts 4-40  #64-3018  
(1 pkg) Screws 4-40  #64-3011    
(1) Solder   #64-009              
(1 pkg) Heat Shrink  #278-1610   
        (3/64" is needed for Cat5 wire - your size depends on wire ga. used
(1) 20' roll Speaker Wire 24 ga. (for start switch) #278-1509
    (or 2-conductor phone wire) 
 
Other:
(1) Pre-programmed MicroController Chip     (included with order
(1) A male to Mini-B male USB Cable (10-foot max)   
(1) CAT-5 Wire approx. 65' needed  (this can also be used for all your hook-up wire)

Tower Materials:
1-1/2" x 1-1/2" x 8' Aluminum Angle (approx. 4' needed) (got Metal from Lowe's)
1" x 1" aluminum side Posts (approx. 2' needed) (got Metal from Lowe's)
Bolts for Tower (length depends on material used for tower)
(2) Metal 3" x 3" 'L' Brackets  (mounting tower to track)    
3/8" All-Thread brass tubing lamp material, 1 foot needed (for mounting sensors and overhead LED's)
(4 pkg) All-Thread Nuts and Washers  (can be found at Lowe's #046935)   
(2 pkg) Cork Plugs (can be found at Lowe's #00  5/16" x 7/32" H#881310)
(2 pkg) Cork Plugs (can be found at Lowe's #0)


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Parts List
Schematics
Pinewood Car
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