A tutorial on sound with Arduino. Do you need to use an op-amp with Arduino? Do you need an audio breakout board? This project explores a DFPlayer Mini to Arduino Mega using a direct speaker connection. Next, he demonstrates the use of an op amp circuit for even more power.
Devices and components
Arduino Mega 2560 Rev3
DFPlayer - A mini MP3 player
General purpose single input op amp
Software and tools
Arduino IDE
Project description
Introduction
Option 1: Direct “small speaker” connection
https://github.com/alittletech1/notes/blob/main/rated/audio/basic%20circuit%20diagram.png
Connect ground and 5V power to the DF reader
Connect RX and TX from pins 2 and 3 of the DF reader to pins 14 and 15 of the Arduino serial port (here 3) on Arduino Mega.
Connect pins 6 and 8 of the DF player to your small 1 watt speaker.
Option 2: op amp version
Build or Buy an Op Amp Circuit
Connect to the DAC_R pin of the DF drive to the Op Amp circuit input.
The Code
https://github.com/alittletech1/notes/blob/main/rated/audio/arduino_mp3.ino
Conclusion
For more details, please watch the video:
Arduino MP3
Arduino source code
Downloadable files
Examples of MP3 files
MP3 files needed for the project
https://github.com/alittletech1/notes/blob/main/rated/audio/mp3.zip
Documentation
Basic Circuit Diagram – Direct Speaker Connection
Direct connection to speakers
basic circuit diagram.png
DFPlayer with operational amp
DFPlayer with operational amp
https://github.com/alittletech1/notes/blob/main/rated/audio/opamp%20diagram.png
Note: Content and images are from: https://projecthub.arduino.cc/, with some modifications.
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