LIN Bus Integration with Arduino, Raspberry Pi and STM32: 3 Practical Guides to Get You Started

1. How to Use LIN Bus with Arduino: Connection, Libraries and Code Example

What you need:

• Arduino Uno or Nano

• LIN transceiver (e.g. MCP2004)

• External 12 V power supply (for LIN line)

• Pull-up resistor (1 kΩ recommended)

• Breadboard and jumper wires

LIN Bus connection diagram:

• Arduino TX → TXD pin on MCP2004

• Arduino RX → RXD pin on MCP2004

• MCP2004 LIN pin → LIN line

• MCP2004 Vbat → 12 V power supply

• GND shared across all components

Recommended Library:

You can use a software UART implementation like AltSoftSerial if you’re working with Uno/Nano.

C++

#include <AltSoftSerial.h>

AltSoftSerial linSerial;

void setup() {

linSerial.begin(19200); // typical LIN baud rate

Serial.begin(9600);

Serial.println("LIN Bus test started");

}

void loop() {

linSerial.write(0x55); // Sync Byte

linSerial.write(0x12); // Identifier

linSerial.write(0x34); // Example data

delay(100);

}

Note: Arduino doesn’t natively support LIN, so you’re emulating the protocol. This is good for learning, but not suitable for production-grade use.

3. LIN Bus on STM32: How to Configure Your Microcontroller to Communicate

What you need:

• STM32 development board (e.g. STM32F103 Blue Pill)

• MCP2004 LIN transceiver

• STM32CubeMX + HAL drivers

• ST-Link programmer

Configuration Steps:

1. Open STM32CubeMX

2. Enable USART1 or USART2 in asynchronous mode

3. Set baud rate to 19200

4. Generate code and open in STM32CubeIDE

Example code snippet:

C

uint8_t lin_frame[] = {0x55, 0x12, 0x34};

HAL_UART_Transmit(&huart1, lin_frame, sizeof(lin_frame), HAL_MAX_DELAY);

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Additional Notes:

• STM32 offers better LIN compatibility via its USART features

• You can implement LIN schedule tables and slave responses using interrupt handlers