Here's a detailed tutorial on how to implement a project that retrieves, processes, and visualizes real-time vehicle data using the CAN protocol, Nextion, Arduino, Altium Design, and OBD-II.
-Step 1: Data Retrieval Objective: Acquire real-time key information from a vehicle (speed, engine RPM, coolant temperature) via the CAN protocol.
Materials Needed: OBD-II to USB adapter
Arduino board (e.g., Arduino Uno)
CAN Bus shield for Arduino
OBD-II cable
Vehicle with OBD-II port
Steps: Set Up the Hardware:
Connect the CAN Bus shield to the Arduino board.
Connect the OBD-II cable to the vehicle's OBD-II port and the other end to the CAN Bus shield.
Install Required Libraries:
Install the necessary libraries for CAN communication in the Arduino IDE. You can use the MCP_CAN library.
Write the Arduino Code:
Write a sketch to initialize the CAN Bus and read data from the vehicle. Here's a basic example:
cpp #include <mcp_can.h> #include <SPI.h>
const int SPI_CS_PIN = 10; MCP_CAN CAN(SPI_CS_PIN);
void setup() { Serial.begin(115200); if (CAN.begin(MCP_ANY, CAN_500KBPS, MCP_8MHZ) == CAN_OK) { Serial.println("CAN Bus Initialized"); } else { Serial.println("CAN Bus Initialization Failed"); while (1); } CAN.setMode(MCP_NORMAL); }
void loop() { if (CAN_MSGAVAIL == CAN.checkReceive()) { CAN.readMsgBuf(&len, buf); unsigned long canId = CAN.getCanId(); Serial.print("ID: "); Serial.print(canId, HEX); Serial.print(" Data: "); for (int i = 0; i < len; i++) { Serial.print(buf[i], HEX); Serial.print(" "); } Serial.println(); } } Upload the Code:
Upload the code to the Arduino board and open the Serial Monitor to see the real-time data being retrieved from the vehicle.
-Step 2: Data Processing Objective: Process the received data to make it usable.
Steps: Parse the Data:
Modify the Arduino code to parse the CAN messages and extract specific information such as speed, engine RPM, and coolant temperature.
Convert Units:
Convert the raw data into human-readable units. For example, convert speed from km/h to mph if needed.
Filter the Data:
Implement filtering algorithms to smooth out the data and remove any noise.
-Step 3: Visualization Objective: Display the data clearly and intuitively on a graphical interface.
Materials Needed: Nextion display
Arduino board
Steps: Set Up the Hardware:
Connect the Nextion display to the Arduino board using the appropriate pins (e.g., TX, RX, VCC, GND).
Design the Interface:
Use the Nextion Editor to design the graphical interface. Create elements such as gauges, text fields, and buttons to display the data.
Write the Arduino Code:
Modify the Arduino code to send the processed data to the Nextion display. Here's an example:
cpp #include <Nextion.h>
NexText speedText = NexText(0, 1, "speed"); NexText rpmText = NexText(0, 2, "rpm"); NexText tempText = NexText(0, 3, "temp");
void setup() { nexInit(); // Initialize CAN Bus and other setup code }
void loop() { // Read and process CAN data String speed = String(parsedSpeed); String rpm = String(parsedRPM); String temp = String(parsedTemp);
speedText.setText(speed.c_str()); rpmText.setText(rpm.c_str()); tempText.setText(temp.c_str()); } Upload the Code:
Upload the code to the Arduino board and observe the data being displayed on the Nextion screen.
Technologies Used CAN: Controller Area Network protocol for vehicle communication.
Nextion: Display for graphical interface.
Arduino: Microcontroller for data acquisition and processing.
Altium Design: Software for designing custom PCBs if needed.
OBD-II: On-Board Diagnostics standard for vehicle data retrieval.
By following these steps, you can successfully implement a project that retrieves, processes, and visualizes real-time vehicle data using the CAN protocol and various technologies.
for further questions mail me on:dagmazen@gmail.com