Lesson 4:
Object Detection I

1. Create and edit procedures (Smart Blocks) to be used across multiple programs

2. Change a program’s behavior based on sensor information

3. Use events to control the flow of a program

1. Create and edit procedures (Smart Blocks) to be used across multiple programs

In ‘Left Turns Can Be Smart Turns’, check that students have created and used a Smart Block to make a left turn.

2. Change a program’s behavior based on sensor information

Check either of the last two missions for successful completion.

3. Use events to control the flow of a program

Check either of the last two missions for successful completion.

1. Describe a situation in which a ‘Wait Until’ block is more useful than a ‘Wait For’ block.

Student answers will vary, but they should demonstrate understanding that the ‘Wait Until’ block waits until a condition (such as a sensor reading) is true, while the ‘Wait For’ block waits for a specific amount of time.

2. Describe a situation in which a ‘Wait For’ block is more useful than a ‘Wait Until’ block.

Student answers will vary, but they should demonstrate understanding that the ‘Wait Until’ block waits until a condition (such as a sensor reading) is true, while the ‘Wait For’ block waits for a specific amount of time.

3. Now that you’ve made your own Smart Block, what’s the next Smart Block you plan to make, and why?

Student answers will vary. All answers should describe a snippet of code that is logically connected to a useful goal for navigation missions.

• Familiarize yourself with the above resources.

• Allow students to complete the missions on their own time.

Q1. What is the input of the touch sensor?

A1. The input is contact with an object.

Q2. The touch sensor returns Boolean values, what does this mean?

A2. A Boolean value is true/false.

Q3. What block uses the touch sensor?

A3. Wait until Touch block.