Introduction: Linkit ONE Sound Reactive LED

The following instructable presents a sound reactive LED. The intensity of LED is increased as the intensity of sound falling increases.

Step 1: Materials

  • Linkit ONE
  • Battery
  • Sound Sensor
  • Transistor
  • LED
  • Jumper wires
  • Breadboard

Step 2: Connect the Sensor

  1. Connect the Vcc pin of sensor to linkit one 5v.
  2. Connect the gnd pin of sensor to linkit one gnd.
  3. Connect the output pin of sensor to linkit one A0.

Step 3: Connect the LED

  1. Connect positive terminal of LED to transistor Collector.
  2. Connect negative terminal of LED to transistor Gnd linkit
  3. Connect base of transistor to linkit D9
  4. Connect emitter of transistor to linkit 5v

Step 4: Upload the Code

The code is:

void setup()


pinMode(9, OUPUT);


void loop()


int a = map(analogRead(A0), 400, 600, 50, 255)

analogWrite(2, a)



Step 5: Test

After uploading the code, connect the battery and switch it on. Tap on the mic and you will see the LED glowing.