3.32 Ultrasonic Ranger

3.32.1 Overview

In this project, we combine the ultrasonic sensor and the OLED module to build a distance meter, whose detection range is 4-300CM.

3.32.2 Test Code

3.32.2.1 Build Code

There are two ways to upload the code: directly open the code file we provide; or manually build blocks.

Directly open the code file we provide:

1. Click and choose Load from your computer

2. We have already downloaded the codes on computer desktop, so open the file and choose 3-32-rangeFinder.sb3

Manually build blocks:

1. Build the two basic blocks:

2. Initialize OLED module by

3. Add a and set text size to 12x16

4. Declare a variable distance and assign the value detected by the ultrasonic sensor to distance

5. Add a to clear the logo displayed on OLED

6. Add an OLED module to display “Distance:” on the first line and show the value of distance on the second line. Add the unit of “CM” after the value.

7. At last, add a refresh block.

   

Complete Test Code

3.32.2.2 Test Result

After uploading code, “Distance:” will be displayed on the first line. What followed is the distance value in “CM” in the second line.