Main Project: Delivery Route

Amend the code that we’ve developed in the learn section to read three color coded cards (red, green & blue) and deliver them to the correct houses on a delivery route.

Using printed line follower template sheets and color-coded sheets, create a delivery route for your courier to follow with a delivery depot at one end and 3 different colored houses (marked by red, green and blue color-coded sheets) at the other.

We’ve provided an example delivery route below for inspiration.

The driveways should consist of two color coded straight path sheets exactly as shown below. However, you are free to design your pavement any way you like.

We've included the images to print in the next few steps for your convenience.

Click on an image in order to print it!

Click on an image to print it!

Create a set of red, green & blue color coded cards to read and deliver by taking some white cards (postcard-sized is good) and coloring one corner with a colored marker.

Alternatively, you can print extra pages from the previous chapters, and cut out the appropriate colored section.

Your courier is going to be customer-facing. Using whatever materials you have to hand, create a personality for your robot by giving it some human-like features.

customer-facing: a robot, an app, or any piece of technology that humans will interact with directly. Special care has to go into good usability, friendliness, and appeal.

Design and build a mechanism on your robot courier for holding the card to be delivered. Some images are provided for inspiration.

To know where to deliver a card, the courier must first read its address. Complete the read_delivery_address function in the Interactive Control Code cell so that the robot performs the following actions when you place a color-marked card under the color sensor and click on the Read Address button:

Amend the code in the Main Code cell so that when you click on the Deliver Letter button  the robot delivers the card from the delivery depot to the correct house and returns to the depot, ready to take the next instruction. 

Considerations: How will your courier find its way back to base after delivering the card?

Coverage testing

Does your code work for all three colors? Repeat the read, deliver & return routine three times, once for each color marked card, so that you’ve delivered a card to every house.

Test for failure cases

It is important to think about ways in which your program can fail and code up sensible responses for those situations. Consider what you would like to happen if you press the Deliver Letter button before you’ve read the address. Code up and test for that behavior.

Don't run your code right away!

Move on to the Try It Out lesson when you've coded the rescue mission.

The Try It Out Lesson has things to consider before you run your code.