Bit Ten DRC Interface Project

A simple, cheap and opensource alternative to the Bit Ten DRC

Welcome to the project. The aim is to reverse engineer the DRC and create a custom version of it. The end-goal is to have a unit that stays tucked inside the dashboard. We will use rotary encoders to control the main volume and subwoofer volume on the fly. Additional controls can be accessed with a web interface - I'm thinking an ESP32 to make life easy.

These are the required steps for the project:

• Teardown of the DRC. Work out the basic electronics and schema
• Snoop on the DRC interface with the main DSP unit
• Create a prototype using a breadboard. Verify functionality
• Create a PCB and housing to replace the DRC with our version

RS485 Packet Capture and Decoding

The following Google Doc outlines the packets transmitted and received by the DRC https://docs.google.com/document/d/1xm5VXMs9jcL1oQyPIb4WubiSsU_rn1Bk5Yaru9MKfjI/edit?usp=sharing

Hardware Report for the Custom DRC (CDRC) PCB

The following Google Doc is a HW report for the PCB. This includes a BOM and pinout diagram https://docs.google.com/spreadsheets/d/1yKb0Uep4GiwMZgCa3Em3xfYRrIc_w2GCmBEI8sHW7xg/edit?usp=sharing

Web Interface for CDRC

CDRC Web Interface - iPad Pro

CDRC Web Interface - iPhone 12 Pro

Update 1 - Rev A Hardware

Custom DRC - Rev A Assembly Render

Custom DRC - Rev A Manufactured

Rev A working well. Mod required to jump the RS485 RX line to a test-point pad to allow for wakeup on activity (requires pin to be in RTC power domain)