Arduino Lab 9: Call Button

Background: For patients who are immobile, there is oftentimes a call button to notify the caretaker that they need something. Using a button, a speaker, and some preprogrammed songs, we are going to recreate this functionality.

Goal: Create a call button that plays a song when pressed.

 

Circuit Setup

• Materials
  • 1x Arduino
  • 1x Pushbutton switch
  • 1x Piezoelectric speaker (buzzer with bare contacts and circuit board material on the underside, looks different than below).
• Setup
  
  • Connect pushbutton so that is connects pin 2 to GND when pressed.
  • Connect “+” side of speaker to digital pin 8.
  • Connect other side of speaker to GND.

  

 

Lab Instructions

Note: There are 4 different files in the starter code. Make sure you download them all.

• I have given you a significant amount of the starting code that handles all the song selection and playing: https://create.arduino.cc/editor/mjdargen_ncsu/231b565e-f8a4-4b80-89dd-4de619c774da/preview.
  
  • If using Arduino Create, go to the link above and click copy to my sketchbook.
  • If using Arduino IDE, open the link and copy all 4 files into your program: call_button_starter.ino, pitches.h, songs.h, songs.ino.
• The starting program as is will randomly select a song and staying playing a song over and over again.
• You need to modify the code to only do this when the pushbutton is pressed. You will need to do the following:
  • Configure pin 2 as INPUT_PULLUP to read the switch.
  • Add an if statement around the two statements in the loop() function that checks to see if the switch is pressed.