Chasing LED Connections

int smokeSensor = A0;
int buzzer = 8;
int led = 13;

int threshold = 400; // Adjust this value according to your sensor

void setup() {
Serial.begin(9600);

pinMode(smokeSensor, INPUT);
pinMode(buzzer, OUTPUT);
pinMode(led, OUTPUT);

digitalWrite(buzzer, LOW);
digitalWrite(led, LOW);

Serial.println("Smoke Detection System");
}

void loop() {

int smokeValue = analogRead(smokeSensor);

Serial.print("Smoke Value: ");
Serial.println(smokeValue);

if (smokeValue > threshold) {
digitalWrite(buzzer, HIGH);
digitalWrite(led, HIGH);

Serial.println("WARNING! Smoke Detected!");
}
else {
digitalWrite(buzzer, LOW);
digitalWrite(led, LOW);

Serial.println("Air is Clean");
}

delay(500);
}

Smoke Detection code

And Smoke Detection connection circuit is here

Smoke Detection connections

Dot Matrix Heart symbol code

#include <LedControl.h>

// DIN, CLK, CS
LedControl lc = LedControl(12, 11, 10, 1);

byte heart[8] = {
B00000000,
B01100110,
B11111111,
B11111111,
B11111111,
B01111110,
B00111100,
B00011000
};

void setup()
{
lc.shutdown(0, false);
lc.setIntensity(0, 8);
lc.clearDisplay(0);

for (int i = 0; i < 8; i++)
{
lc.setRow(0, i, heart[i]);
}
}

void loop()
{
// Nothing here
}

Code for Piano with Arduino

const int buzzer = 10;

const int buttons[8] = {2, 3, 4, 5, 6, 7, 8, 9};

const int notes[8] = {
262, // Sa
294, // Re
330, // Ga
349, // Ma
392, // Pa
440, // Dha
494, // Ni
523 // High Sa
};

void setup() {
for (int i = 0; i < 8; i++) {
pinMode(buttons[i], INPUT_PULLUP);
}

pinMode(buzzer, OUTPUT);
}

void loop() {
bool playing = false;

for (int i = 0; i < 8; i++) {
if (digitalRead(buttons[i]) == LOW) {
tone(buzzer, notes[i]);
playing = true;
break;
}
}

if (!playing) {
noTone(buzzer);
}
}

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🌍 Rethinking STEM Education: What Should a Modern School STEM Curriculum Look Like?

I’ve been working on an idea for a STEMthinkers International STEM Curriculum Framework designed around a simple question:

Are students only learning STEM concepts, or are they actually learning how to think, build, solve and innovate?

I believe a modern STEM curriculum should move beyond:

📚 Theory → Worksheet → Examination

and move towards:

🔍 Explore → Question → Design → Build → Test → Improve → Present

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