The $40 Line Follower - Step 1: Parts List

Submitted by Pratheek on January 11, 2008 - 6:50am.

Parts List

Below is the list of parts needed to build the robot.

Item	Qty	Price	Vendor, Part no.
BC548 transistor	4	0.4$	Futurlec.com
CdS Photoresistors	4	2.99$	Radioshack.com 276-1657
5mm Blue Led	4	1.40$	Digikey.com
PC Board(Experimenters Board)	1	1.50$	Futurlec.com
100uf 25V Electrolytic Capacitor	1	0.08$	Futurlec.com C100U25E
270 ohm resistor	1	0.10$	Futurlec.com R270R14W
5mm Green LED	1	0.10$	Futurlec.com LED5G
16 pin DIP socket	1	0.07$	Futurlec.com ICS16
L293D	1	Free Sample
Male Header Pins	4	0.17$	www.robotstore.com
20K Preset	4	0.60$	Futurlec.com TRIM20K
5mm Red LED	2	0.16$	Futurlec.com LED5R
1K resistor	2	0.20$	Futurlec.com R001K14W
1 Inch Standoff	6	4.98$	Hobbyengineering.com H02171-04U
100 rpm DC motor	2	23$
Wheels (7.5 cm diameter)	2	3$
L-Bracket (to mount motor)	2	1$

Total		39.75$

I bought the motor, wheels and L-Bracket from a local store. I’m not sure if you can buy the same parts online. But similar parts are available at hobbyengineering.com
Other optional parts

9cm x 8cm HDPE Plastic	1	4$
Velcro strip	1
Old mini CD’s (instead of expensive wheels)	2	<1$
0.22uf Ceramic Capacitor	2	0.50$	Hobbyengineering.com H01032-02D

NOTE - Please go through the complete tutorial before buying the parts.

Apart from these parts you will also need the following tools and materials, if you don’t have them you may consider buying or borrowing them-
• Soldering Iron
• Desoldering Pump(optional)
• Crimper
• Drilling machine
• A 9v battery and battery clip
• Wires
• Cardboard or wood(instead of the HDPE Plastic)

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