CS-STEM Network

2-Wheeled Cart

The final project for this unit is to construct a 2-Wheeled Cart.

Basic Design Requirements
1. Design and build a cardboard or foam core chassis with two motors attached to wheels.
2. You should have a program that triggers two different movements (forward on a HIGH signal, and backward on a LOW signal).
3. There should be something that allows the robot to have a third “wheel” that skids along the ground.
Build Requirements
1. You can use any wires or connectors from previous steps.
2. The wheels should be placed in such a way that allows forward and backward movement.
3. (Optional) You can use a Battery Pack to power your design if you have one available.
Block Diagram Requirement
1. Include a sketch of your final circuit in block diagram form with your submission. HINT: Draw the diagram before you build the circuit, so you can see whether your circuit makes sense before you spend time putting it together.
2. The diagram may be informal, but must clearly show all electrical paths, and indicate the Arduino, motor, the motor control board, and the battery connections.
Workmanship
1. Mount all the pieces securely. Nothing should come loose when shaken.
2. All wiring should be neat, of the proper length, and securely attached.

Core Functions 30 points

Cart must go on when the Arduino is powered ON. The cart must make two different movements when powered ON.
Workmanship: Shake Test 10 points

When shaken firmly, the cart must stay intact. No rattling of parts should be heard or felt (Exception could be the wheel “axles”).
Workmanship: Neatness 10 points

All wires should be of a proper length and use proper connectors -- no extra loops should be present, and connections should not be secured with tape where a connector is more appropriate (for instance, using electrical tape instead of a spade connector on a screw terminal).
Bonus: Unique Improvements +5 points / additional design

+5 bonus points for each additional design feature that benefits the functionality or durability of the device. For instance, protecting the electronic components with an additional cardboard "shield", or placing the battery in a more robust battery holder. You can also try to add onto the program to make the cart turn!

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