Interface Lab - HW 2

I/O Digital Project - HW 2

Date: Tuesday, 07/21/2026

Class: Interface Lab (IMALR-GT 104)

Section: 002

Name: Janice Vuong

Week: Week 2

For my Input/Output Digital Project for homework, I tried using the tiny speaker (Mini Speaker 3w/8ohm) in my kit.

I also checked out another speaker from the Shop Floor staff (thank you Antonia!), but then when I got home I was confused on how to add it 😕

Oh! And this week, I learned how to wire strip and make my wires look neater (thank you to Tobi!). I think I spent way tooo long on a pair of dull wire strippers, until I finally checked out a pair of sharper wire strippers.

This was building on from the prior Lab ↗ (from 07/14), and I just wanted to test/play using the speaker for the first time on my breadboard/Arduino.

Using a 100 ohm resistor for the speaker in my breadboard

I chose a frequency between 2500-4000 Hz, because that was a range that the human ear can hear, but didn’t sound too irritating.

Here is my code for the Arduino IDE

void setup() {
// put your setup code here, to run once:
pinMode(2, INPUT);    // set the pushbutton pin to be an input
pinMode(3, OUTPUT);   // set the speaker button to be an output
}
void loop() {
// put your main code here, to run repeatedly:
// read the pushbutton input:
if (digitalRead(2) == HIGH) {
// if the pushbutton is off
tone(3, 3500);    // turn on the speaker to 3500 Hz
//if push button is pressed, it will turn off the speaker
} else {
// if pushbutton is on
noTone (3); 
//turn off the speaker
}
}

Here is a video (with sound) of the speaker working!

Arduino shown, speaker emitting noise/tone when switch button is pressed

If I had more time, I definitely would have liked to play around and add more speakers, or even try a phototransistor (a sensor that detects/converts light into electrical current) into my device, but I was really pressed for time due to personal matters that occurred unfortunately ☹️