The basic idea is to split one audio signal into two separate audio signals. With a (mobile) app you can control the audio signals. The left and right volume of the first audio signal can be controlled with sliders. The second audio signal can be contoller with a 6 band equalizer.
| Component | Amount |
|---|---|
| ESP8266 Wi-Fi module | 1x |
| ADAU1401 SigmaDSP 28-/56-Bit Audio Processor | 1x |
| 3.5mm jack input connector | 3x |
| Micro USB breakout board | 1x |
| Green 5mm LED and 220 ohm resistor (optional) | 1x |
GPIO5 and GPIO4 are used for i2c (D1 and D2). Check this reference for more info. The USB Breakout board used as a power supply from a regular 5V phone charger or USB from a PC or laptop.
| ADAU1401 | ESP8266 | USB board | Jack In 1 | Jack Out 1 | Jack Out 2 |
|---|---|---|---|---|---|
| +5V | VIN | +5V | |||
| GND | GND | GND | |||
| SDA | D2 (GPIO4) | ||||
| SCL | D1 (GPIO5) | ||||
| In GND | GND | ||||
| In Left | In Left | ||||
| In Right | In Right | ||||
| Out 1 GND | Out 1 GND | ||||
| Out 1 Left | Out 1 Left | ||||
| Out 1 Right | Out 1 Right | ||||
| Out 2 GND | Out 2 GND | ||||
| Out 2 Left | Out 2 Left | ||||
| Out 2 Right | Out 2 Right |
Optionally connect a status LED in series with a 220 ohm resistor to D5 (GPIO14) of the ESP8266 and to GND.
To use this project you have to install Sigma Studio 4.x. After installing Sigma Studio you can open the file:
\Sigma\Project.dspproj
But before opening the project you have to create a folder:
\Sigma\Output
You can use the buttons "Link Compile Download" and then "Export System Files" and then select the "Output" folder as destination. There is a post export command that copies the Project_IC* files to the Server folder. From the Arduino IDE these files are now included in the Arduino project.
Add the file:
SigmaStudioFW.h
from your "C:\Program Files\Analog Devices\SigmaStudio 4.x" to the "Server" folder also. Because of copyright you are not allowed to distribute this file.
