Testing the TDA7439 Digital Tone Control Board with OLED Display, Arduino Nano and Bluetooth Remote

Testing the TDA7439 Digital Tone Control Board (BASS,TREBLE, MID & BALANCE ) with OLED Display, Arduino Nano and Bluetooth Remote.
IC TDA7439 – volume control and three-band tone control, designed for use in HI-FI equipment and high-quality car audio systems, has a low level of noise and distortion.

Main technical characteristics of the TDA7439 IC:

Volume 48 levels from -48 to 0 dB
Bass, midrange, treble tone control ±14 dB (±7 levels)
Input switching - 4 stereo channels
Encoder ky-040

Gain from 0 to 30 dB independent for each channel
Balance adjustment ±8 dB (limited by software)
Supply voltage 6 to 10.2 V (9 V typical)
SOI at a frequency of 1 kHz no more than 0.01%
The microcontroller board and the TDA7439 audio processor exchange data on the I2C bus via the SDA (data) and SCL (clock) lines.

Three buttons, the KY-040 encoder and the VS1838B IR module are used as controls for the volume and tone control. Information about the settings is displayed on an OLED display with a resolution of 128 by 64 pixels, display diagonal 1.3 inches, driver chip - SH1106 I2C. The project uses the LGT8F328 controller board, but you can use Arduino Nano

Code:
http://rcl-radio.ru/?p=131205

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