colour Line Follower Robot

Table 2: Component list with price
Needed Item
Unit Price (£)
Quantity
Total Price (£)

Photoconductive cell
0.42
2
0.84
Trimmer
0.233
4
0.932
Comparator
0.263
1
0.263
Logic gate (AND)
0.25
1
0.25
Logic gate (NOT)
0.123
1
0.123
Logic gate (OR)
0.153
1
0.153
Timer (555 chips)
0.17
1
0.17
Transistor
0.32
2
0.64
Rectifier
0.05
2
0.10
Resistor (68O)
0.088
2
0.176
Resistor (3.3kO)
0.126
2
0.252
Resistor (10kO)
0.078
1
0.078
Resistor (100kO)
0.057
1
0.057
Capacitor
0.083
1
0.083
Film Capacitor
0.101
1
0.101
LED (White)
0.27
1
0.54
Total cost
4.758
4 Risk Assessment
Possible hazardous features of this project:
• High temperature from the soldering tool
• High temperature caused by short circuit
• Dangerously bright light caused by LED connected to too high voltage • Explosion caused by capacitor connected to too high voltage
• Dangerous caused by motor with high rotation speed
• Toxic chemical leakage from batteries
Ways to reduce the effects of hazards:
• Using gloves and safety glasses during soldering 9
• Double check the circuit before testing. In a better way, simulate the circuit by computer program first
• Do not connect too high voltage to the circuit during the testing
• Control the rotation speed of motor, using groves if necessary
• Check the batteries before using it

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