ESP32 CKP Signal Generator

A project designed to generate CKP and CMP signals for bench-testing an ECU. This project utilizes an ESP32 microcontroller with the ESP-IDF framework, integrates an HD44780-based LCD display, and features three control buttons for user interaction.

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Features

• User Interaction:

  • Buttons: Up, down, and confirm buttons to select synchronization mode.
  • Potentiometer: Adjust RPM control in real time.
  • LCD Display: Display syncronism selection menu and current RPM.

• Output Signals:

  • CMP and CKP (5V): Simulates sensor outputs using a Hall effect sensor.
  • Square Wave CKP: Simulates an inductive sensor.

• Power Supply: Uses a external 12V supply for the square wave output, other components is supplied with 5v using a LM7805.

• Complete Schematics:
  All necessary schematics for building the hardware are provided with the project.

• Create Custom Signal: It allows to create full custom signals.

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Using a Custom Signal

To define and use a custom synchronization signal, you need to edit the syncTable[] struct array. Each entry in this array represents a unique synchronization pattern used by the system.

Syntax:

{"syncName", totalTeeth, totalMissingTeeth, {cmpTeeth}, cmpCount}

Parameter Descriptions:

• syncName (string): A descriptive name for the custom signal.
• totalTeeth (int): Total number of crankshaft position (CKP) teeth in the signal.
• totalMissingTeeth (int): Number of missing teeth used for synchronization.
• cmpTeeth (array of int): The CKP tooth indices at which the camshaft position (CMP) signal changes its state (high ↔ low).
• cmpCount (int): Total number of CMP transitions within one engine cycle.

Example:

{"Sync Test", 100, 4, {50, 51}, 2}

This defines a signal named "Sync Test" with the following properties:

• 100 total CKP teeth
• 4 missing teeth
• CMP signal changes state at teeth 50 and 51
• 2 CMP transitions in total

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Setup and Installation

1. Clone the Repository:

   git clone https://github.com/LucasStraps/ESP32-CKP-Signal-Generator.git

2. Open in VSCode:

   • Launch VSCode.
   • Open the project folder.

3. Install ESP-IDF Plugin:

   • If not already installed, add the ESP-IDF extension from the VSCode marketplace.
   • Follow the setup instructions provided by the extension.

4. Build and Flash:

   • Use the ESP-IDF plugin commands to build the project.
   • Flash the firmware to your ESP32 board.
   • The signal is generated constantly on core 0, so ignore the watchdog error. You can disable it on SDK configuration.

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Operation

1. Signal Generation Process:

   • The LCD display will present options for synchronization selection.
   • Use the up and down buttons to choose the desired synchronization mode.
   • Press the confirm button to start generating the CKP and CMP signals.
   • Adjust the RPM using the potentiometer as needed.
   • To restart or select a different synchronization mode, press any button.

2. Signal Outputs:

   • CMP & CKP (5V): Outputs simulate a Hall effect sensor.
   • Inductive CKP: Provides a square wave output to simulate an inductive sensor, as the ECU only detects when the wave passes the 0v mark, the wave format does not matter, so it does not neet to be a sine wave.

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Schematic

All schematics for the hardware connections and design are provided within the project repository. Refer to the schematic/ directory for detailed diagrams and connection guides.

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License

This project is licensed under the MIT License. See the LICENSE file for details.

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