Embedded Files
OVERVIEW
OVERVIEW
In programming, a very important concept to understand is the loop. Loops allow you to repeat a sequence of instructions until a condition is met. In Tello EDU the loop command is found in the "control" block. We will use this block to repeat a series of moves to complete the mission.
CODING
CODING
We are going to code a mission that uses each of the motion, variables and control blocks and instructs Tello to perform each of the script 2 times. Without the capability of a loop, or repeat block, the code would appear similar to Figure 2. However, by using a loop or repeat block the redundant code can be reduced similar to Figure 4.
Figure 1: Level 1.4
Figure 1: Level 1.4
Figure 2: In expanded block code
Figure 2: In expanded block code
As you can see in Figure 2 there are several blocks that repeat multiple times and if you wanted to continue the zig zag pattern the code would become unmanageably long.
If we refer to Figure 2 a repeating pattern can be identified therefore we can use a repeat control block to reduce the physical amount of code that is needed to be scripted.
Figure 2: Level 1.4
Figure 2: Level 1.4
Figure 3: Flowchart using repeats and if/else statement
Figure 3: Flowchart using repeats and if/else statement
Flowcharts can be an excellent way to visually represent the code and identify if the script will work. Figure 3 demonstrates the possible sequence for level 1.4 of the Tello Edu app.
The flowchart was made using a flowchart generator: https://www.draw.io/
Figure 3: Tello Edu app Level 1.4 flowchart
Figure 3: Tello Edu app Level 1.4 flowchart
Figure 4: Refactored using repeat & If/else statements
Figure 4: Refactored using repeat & If/else statements
A control block such as an if/else statement can be used to reduce the amount of code further, Figure 4 demonstrates one way in which this code can be written however, there are various alternatives. Can you design and create a script that completes the course with the same or fewer blocks than figure 4. This program is not the most efficient code and only achieves 2 out of 3 stars.
Figure 4: Level 1.4
Figure 4: Level 1.4
Figure 5: 3 Star Refactored using repeat & If/else statements
Figure 5: 3 Star Refactored using repeat & If/else statements
A control block such as an if/else statement can be used to reduce the amount of code further, Figure 5 demonstrates another way the code can be written using the if/else statements this code gets 3 out of 3 stars.
Figure 5: Level 1.4
Figure 5: Level 1.4
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