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UART Setup for Multidisplay

This document explains how to set up UART communication with the multidisplay system.

Overview

The multidisplay system can output serial data via UART for external monitoring and integration with other systems like OpenDash. The system can also output data via Bluetooth using an HC-06 module connected to Serial2.

Serial Output Format

The system outputs data in the following format:

2:12345:1200:15:25:14.5:12:10:25:30:12.5:15:20:25:30:35:40:45:50:55:60:65:70:75:80:85:90:95:100

Where:

  • 2: Output type (SERIALOUT_ENABLED)
  • 12345: Time in milliseconds
  • 1200: RPM
  • 15: Boost pressure
  • 25: Throttle position
  • 14.5: Lambda value
  • 12: LMM
  • 10: Case temperature
  • 25,30,12.5,15,20,25,30,35: 8 EGT values (maximum 8 sensors)
  • 40: Battery voltage
  • 45,50,55,60,65,70,75,80,85,90,95,100: VDO pressure and temperature values

Hardware Setup

UART Connection

To connect to an external system:

  1. Connect the UART pins of the multidisplay to the external system
  2. Use a level shifter if needed (multidisplay is 5V, external systems may be 3.3V)
  3. Ensure common ground connection

Bluetooth Connection

To connect via Bluetooth:

  1. Connect an HC-06 Bluetooth module to Serial2 of the multidisplay
  2. Configure the module to connect to "rAtTrax" or "multidisplay"
  3. The module will forward the multidisplay serial data to the connected device

Pin Configuration

  • TX: Usually connected to pin 1 (Arduino pin 1) or configurable
  • RX: Usually connected to pin 0 (Arduino pin 0) or configurable
  • GND: Common ground
  • VCC: 5V power supply

Configuration

The serial output is enabled by default in the multidisplay system. To verify or modify the configuration:

  1. Check the MultidisplayDefines.h file for serial output settings
  2. Ensure SERIALOUT_ENABLED is defined
  3. The baud rate is set to 115200

Integration with OpenDash

To integrate with OpenDash:

  1. Connect the UART pins between multidisplay and OpenDash
  2. Configure OpenDash to read from UART (this is handled automatically)
  3. The data will be parsed and displayed on the OpenDash UI

Connection Toggle

The OpenDash system supports enabling/disabling the multidisplay connection via a configuration toggle:

  • Set MultiDisplay-Connection=true to enable connection to multidisplay
  • Set MultiDisplay-Connection=false to disable connection to multidisplay

Troubleshooting

No Data Received

  1. Check UART connections
  2. Verify the baud rate matches (115200)
  3. Ensure common ground is connected
  4. Check that serial output is enabled in the multidisplay configuration

Incorrect Data Format

  1. Verify the multidisplay firmware version
  2. Check that the output format hasn't changed
  3. Ensure the data is being sent in the correct format