Arduino Projects: Arduino Decibel Meter

6 thoughts on “Arduino Projects: Arduino Decibel Meter”

1. Works great! I made one, though I used 100 ohm and 470 ohm resistors because I didn’t have any 220 ohm resistors. I used the 100 ohm ones before the 470 ohm resistors so the first 5 LEDs would at least be brighter. The whole thing still works wonderfully. Thanks!

2. Great!

3. I have made it so it only works for 5 leds, with an arduino MEGA it doesn´t work. what did I do wrong??, I am a complete newbie in electronics.

   int led[5] = {30, 31, 32, 33, 34};
   int input, i;
   void setup()
   {

   for (i = 30; i < 35; i++)
   pinMode(led[i], OUTPUT);
   Serial.begin(9600);
   }
   void loop()
   {
   input = analogRead(A0);
   //Serial.println(s);
   input = input / 5; //By changing the denomintor the sensitivity can be changed
   if (input < 5)
   {
   if (input == 0)
   {
   for (i = 30; i < 35; i++)
   {
   digitalWrite(led[i], LOW);
   }
   }
   else
   {
   for (i = 30; (i-30) < input; i++)
   {
   digitalWrite(led[i], HIGH);
   delay(4);
   }
   for (i = i; i < 35; i++)
   {
   digitalWrite(led[i], LOW);
   }
   }
   }
   }

4. why the leds lights the same time

5. Hello,
   Great project !
   I’m new to Arduino coding and I’m trying to understand to make a similar project.
   How could I adapt your code to display the amount of décibels on a WS2812B led strip ?
   It is for my wife’s classroom.
   Thank you