This is a correction to my old DFPlayerMini video
about playing MP3 files with Arduino
Previously, I just had straight connections
from Arduino to the MP3 player board
but actually the signal pins of the DFPlayerMini board
are not 5 volts tolerant
It still can be powered by 5 volts
And the speaker can be connected
to the speaker output of the board
But we need a voltage divider on the RX signal
TX can still be connected directly to Arduino
since it can read the 3.3 volt input signal
Currently, I am powering it directly
from the Arduino 5 volt pin for simpicity
But actually, it would be better
to use a separate power supply
for the DFPlayerMini board
This will reduce noise
and you could use more powerful speakers
On the code side
I am using DFRobot DFPlayerMini library
In this example, I just start playing file 5
which is the laugh track
