*** Bill of Materials and Hours Spent ***

Submitted by airman00 on February 24, 2008 - 4:01pm.

Here is the bill of materials for this robot. Now before all of you are baffled by the realtively high price let me let you in on a little secret. Some of the parts here were reused from previous projects I made .

I got plexiglas donated to me, I got some parts as free samples,  I got the PICBASIC PRO compiler for free from a friend, and I bought a ton of parts on eBay for up to 75% off what it usually goes for. So the actual total cost for me personally was less than $50 , most of the savings are from already owning the parts.

PART

QUANTITY

TOTAL

TOTAL W/OUT EXTRAS:

        $107.90

w/ options = $477.90


QRB1113 IR reflective sensors

5

5 @(FREE SAMPLES) = $0

3" x 3/4" aluminum mending plates

2

2 @($.6225 ea.) = $1.25

1 1/2" #8-32 machine screw

3

3 @($.07 ea.) = $0.21

1/2" # 8-32 machine screws

11

11 @($.07 ea.) = $0.77

#8 washers

16

16 @($.06 ea.)= $0.96

#8 nuts

14

14 @($0.12 ea.)= $1.68

"L" brackets

4

4 @($0.66 ea.) = $2.64

1 foot of 1/8" diameter heat shrink

1

1 @($1.30 ea.)=$1.30

400 K ohm Photoresistor

1

1 @($2.00 ea.)=$2.00

HS-425BB servos

2

2 @($14.99 ea.)=$29.98

Universal Servo Mounts

4

4 @($0.975 ea.) = $3.90

3/8" #4 Screws

8

8 @($0.12 ea.) = $0.96

1/2" #4 Screws

4

4 @($0.12 ea.)= $0.48

2.5" Airplane Wheels

2

2 @($0.2645 ea.) = $5.29

Ball Caster Kit

1

1 @($3.00 ea.)= $6.00

Plexiglas Base

1

1 @(DONATED)= $0

4AA Battery Holder

1

1 @($1.10 ea.) = $1.10


 

Universal Sensor Mount

1

1 @($4.95 ea.)= $4.95

Parallax PING Ultrasonic Sensor

1

1 @($29.95 ea.)=$29.95

HS-311 Servo

1

1 @($8.99 ea.) = $8.99

400 Point Breadboard

1

1 @($4.00 ea.) = $4.00

10K ohm resistor

5

5 @($0.10 ea.) = $0.50

220 ohm resistor

6

6 @($0.10 ea.)=$0.60

.1uF ceramic capacitor

2

2 @($0.07 ea.)=$0.14

T 1 ¾ LED

1

1 @($0.15 ea.)= $0.15

100K resistor

2

2 @($.05 ea.)= $0.10

PIC16F616

1

1 @(FREE SAMPLE)

PICBASIC PRO Compiler (Optional)

1

1 @($250) = $250

U2 Programmer(Optional)

1

1 @($120)= $120


 

 

 

 

 

 

TIME SPENT

 

Researching : 50 hours

Designing:     100 hours

Assembling :  10 hours

Documenting: 35 hours

 

For a total of : 195 hours

 

 

Whats the reason for all that time researching and designing? This was my first project with a microcontroller, with IR photoreflective sensors, with PING ultrasonic sensors , and with PICBASIC. If I were to do a similar project now, after gaining all this knowledge, I would probably finish eveything in under 20 hours.