Learning Goals
- Work with laser ping distance sensor
- Implement conditional logic based on sensor readings
- Control audio output with different volume levels
- Create proximity-based feedback system
Software and Hardware
- BlocklyProp Solo
- Activity Board
- Parallax USB programming cable
- Laser Ping Distance Sensor
- SD card with audio files
- Speaker/Audio output
Programming Assignment
Create a script that:
- Reads laser ping sensor data in centimeters and assigns it to a variable (e.g.,
distance); please note the sensor is connected to pin 15. - Prints distance in centimeters in the terminal with its unit (e.g.,
distance: 10 cm). - Makes decisions based on the distance according to the conditions table below.
Conditional Logic Table
| No. | Conditions | Action |
|---|---|---|
| 1 | If distance ≥ 50 cm |
Nothing (speaker is OFF) & Print( "distance > 50") in terminal |
| 2 | If 30 ≤ distance < 50 cm |
Play a sound (e.g., techloop.wav) with volume 7& Print( "30 ≤ distance < 50") in terminal |
| 3 | If distance < 30 cm |
Play a sound (e.g., techloop.wav) with volume 10& Print( "distance < 30") in terminal |
Step-by-Step Tutorial
1. Setting Up Audio Files
- Download
techloop.wavfrom Canvas, or you can download a sound from the Sound Library - Paste the music files (
.wav) onto the SD card of the activity board.
2. Reading Distance Sensor
- Connect the laser ping sensor to pin 15
- Use the appropriate BlocklyProp block to read distance in centimeters
- Store the reading in a variable called
distance
3. Implementing Conditional Logic
- Use if-else statements to check the three distance conditions
- Print appropriate messages to the terminal for each condition
- Control audio playback based on distance ranges
- Set different volume levels (7 for medium range, 10 for close range)
4. Sample Code for Playing Music
Use the following approach to play audio files:
What to Submit
Submit your code saved as a *.svg file with appropriate naming convention:
Lab5_YourInitials_DescriptiveName (e.g., Lab5_AM_distance_audio)