Line follower

A line follower built for as part of an electronics course. Design and construction is done from scratch.

Consists of elements from analog sensing, digital logic, and driver circuits.

• Video of line follower in action - Youtube 720p

Outline

The project had the following outline:

• An autonomous unit following a dark line on a bright background
• Logic 1 (5V) when detector is over line, otherwise logic 0 (0V), CMOS technology
• Motors controlled by driver circuit
• Turn off when no line under detectors
• Steering right/left accomplished in 3 phases; straight ahead, 5 degree, and 10 degree
• Powered by a battery power-source

BOM

• 1 L293D motor driver
• 5 QRD1114 IR LED and Phototransistor sensor
  • Or, 5 LED red
    • 5 SD5443 phototransistor
• 1 BC546B BJT transistor
• 2 GM8 motor and wheel kits
  • GMPW Deal
• 2 GMB28 GM8 gear motor bracket
• 1 RE210-S1 Protot.card 100x160
• 1 9v battery connector
• 1 LM2937 5v voltage regulator
  • Or, 7805 5v voltage regulator
• 3 4071 Quad OR-gates
  • Or, 2 4072 Dual 4-input OR-gates
• 1 4069 Hex NOT-inverters
• 1 1N4148 diode small signal
• 1 SWT1 SPDT Switch
• x 10k Resistors
• Or, RT20k 20k Multi-turn trimpot

Photo gallery

• 
• 
• 
• 
• 
• 
• 
• 
• 
• 
• 
• 
• 
• 
• 
• 
• 
• 
• 
•