2. Methods



2.1 Equipment List


  • Blue plastic robot chassis (includes wheels, motors, and 6xAA battery holder)
  • AA batteries (6)
  • Breadboard
  • Jumper wire kit
  • Power switch
  • L293DN H-bridge motor driver
  • 10 kΩ resistors (4)
  • Lever switches (2)
  • Ice Cream Sticks (2)
  • Hot Glue Gun

2.2 Diagrams of experimental setup

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Figure 1: Obstacle-Avoiding Robotic Car


2.3 Procedures



1. Follow steps in the video below to build the chassis of the car.


2. Connect jumper wires, L293DN H-bridge motor driver, resistors and power switch with the breadboard, battery holder, motors and switches according to the picture below.
3. Use the hot glue gun to glue the ice cream sticks onto the lever switches' metal plane.

4. Use the hot glue gun to glue the battery pack to the main frame.

5. Use the hot glue gun to glue the lever switches to its appropriate positions at the front of the car.

2.4 Risk Assessment and Management


Risk
Assessment (Low/Medium/High)
Management
Risk of short circuit occurring and causing potential burns to hand.
Medium
Make sure I connect the wires correctly and when I feel that the car is hot or smell smoke, immediately disconnect the power source.
Risk of the jumper wires pricking my fingers.
Low
Be careful when handling wires and don’t press on the sharp end of a jumper wire.
Someone stepping on the car and fall, causing potential harm to the person.
High
Only test out the car in places with little people.
Risk of dropping car onto feet.
Medium
Hold it carefully and wear covered shoes.

2.5 Data Analysis
Run a test to find out if it works as planned.
Evade the following:

1. One obstacle to the left
2. One obstacle to the right
3. One obstacle straight up.
4. One obstacle on each side.
5. A corner.

If the robotic car is able to evade all the above, it is working as planned.

The videos are uploaded in the results sections.








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