Hello, in the image below you can see the diagram. I'm using:
- Arduino Nano.
- GY-INA219 GY-219 Custom digital current sensor module (color blue in the sketch)
- MP3 module
- Display module
- Micro USB - USB connector
- RGB LED module
When I connect the Micro USB connector to the power, the MP3 shield get a weird sound. However, if I connect the Arduino Nano to my computer, the sound is good. I have read this post: https://forum.arduino.cc/index.php?topic=600207.msg4075172#msg4075172, so I think it's normal but, how can I solve it? I'm a noobie on this so I really don't know what can I do...
In the second image (I got it from the tutorial where I also got the first image), I can see a capacitor (rounded in blue) that maybe solves the problem, but I don't know why it doesn't appear on the diagram.