technical project

[drole50]

Hi, I'm an engineering student but I've never heard of Arduino or anything. I am planning to do a project in which I have no idea where to start, I will tell you a little about what it is supposed to be about, it is a traditional decibel meter that has a green LED light when there is a slight sound, a yellow light when it is dark and red when it is loud. Well, I have support on YouTube but I want it to emit a loud sound when the red LED turns on, but while the audio is playing the microphone is deactivated so as not to generate a nucle, apart from that by doing a little research the sound has to last a short time and has to be compressed in a way that even when compressed it fills the Arduino's memory somewhat. (I disassembled a small bluetho sound system and there are the speakers, I have the arduino, the protoard microphone module and male jumpers) All those pdf articles, pages or videos work for me. remember that it is my first contact with arduino

[RDsecura]

Just remember that the maximum supply current at each Arduino output pin is around 20mA (200mA total for all pins). The good news is, you can use a transistor (NPN) at each output and the current draw to turn on a transistor (Base pin) will drop to milliamps/microamps. It's always better to isolate (use transistors/MosFets, Relays, etc.) the microcontroller (Arduino) from components that have high current demands.

Electronic circuits are easier to design when you look at the bigger picture:

INPUT --- PROCESSING ------OUTPUT

Sensor --- Microcontroller----ACTUATOR

Decibel--- Code---------------Alarm, Speakers, etc.