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CAN BUS SHIELD

CAN-BUS is a common industrial bus because of its long travel distance, medium communication speed and high reliability. It is commonly found on modern machine tools, such as an automotive diagnostic bus.

This CAN Bus Shield adopts MCP2515 CAN Bus controller with SPI interface and MCP2551 CAN transceiver to give your Arduino CAN Bus capability. With an OBD-II converter cable added on and the OBD-II library imported, you are ready to build an onboard diagnostic device or data logger.

Note

For transportation considerations, the plug-in components of the kit are not soldered by default. After you receive the kit, you need to do some soldering work. If necessary, you can also contact info@longan-labs.cc after purchasing the board, then we can send it to you after the board is soldered well.

CAN BUS PRODUCTS LIST OF LONGAN LABS

We have made a lot of can bus products, you can get more information through the following list, so as to choose a product suitable for you.

PRODUCT NAME LINK PRICE MCU CHIP PROTOCOL
Serial CAN Bus Module LINK $19.9 ATMEGA168PA MCP2515 CAN2.0
I2C CAN Bus Module LINK $19.9 ATMEGA168PA MCP2515 CAN2.0
OBD-II Serial CAN Bus Dev Kit LINK $20.9 ATMEGA168PA MCP2515 CAN2.0
OBD-II CAN Bus GPS Dev Kit LINK $29.9 ATMEGA32U4 MCP2515 CAN2.0
OBD-II CAN Bus Basic Dev Kit LINK $24.9 ATMEGA32U4 MCP2515 CAN2.0
CAN-FD Shield LINK $12.9 NO MCU MCP2517FD CAN-FD
CAN Bus Shield LINK $5.9 NO MCU MCP2515 CAN2.0
CANBed LINK $24.9 ATMEGA32U4 MCP2515 CAN2.0
CANBed-FD LINK $19.9 ATMEGA32U4 MCP2517FD CAN-FD
CANBed M0 LINK $24.9 ATSAMD21 MCP2515 CAN2.0
CANBed M4 LINK $19.9 ATSAME51 - CAN-FD
OBD-II RF Dev Kit LINK $19.9 ATmega168PA MCP2515 CAN2.0

Features


  • Implements CAN V2.0B speed up to 1 Mb/s
  • Industrial standard 9 pin sub-D connector
  • Standard (11 bit) and extended (29 bit) data and remote frames
  • OBD-II and CAN standard pinout selectable.
  • Changeable chip select pin
  • Changeable CS pin for TF card slot
  • Changeable INT pin
  • Arduino Uno pin headers

Note

CAN Bus Shield Work well with Arduino UNO (ATmega328), Arduino Mega (ATmega1280/2560) as well as Arduino Leonardo (ATmega32U4).

Part List

  1. CAN Bus Shield PCBA x 1
  2. 6 pin header x 1
  3. 8 pin header x 2
  4. 10 pin header x 1
  5. 2x3 pin header x 1
  6. 2 pin terminal x 1
  7. DB9 connector x 1
  8. Switch x 2

Hardware Overview


  1. DB9 Interface - to connect to OBDII Interface via a DBG-OBD Cable.
  2. V_OBD - It gets power from OBDII Interface (from DB9)
  3. Led Indicator:
    • PWR: power
    • TX: blink when the data is sending
    • RX: blink when there's data receiving
    • INT: data interrupt
  4. Terminal - CAN_H and CAN_L
  5. Arduino UNO R3 pin out
  6. ICSP pins
  7. SD card slot
  8. 120Ω terminal resistor switch

DB9 connector

The DB9 interface of CAN Bus has two different protocols, OBD and CAN Open. Their definition is as follows,

pin# OBD(default) CAN OPEN
1 GND N.C
2 GND CAN_L
3 CANH GND
4 N.C N.C
5 CANL GND
6 N.C N.C
7 N.C CAN_H
8 N.C N.C
9 CAN_V+ CAN_V+

If you want to use the OBD protocol, you don't need to make any changes to the hardware.

If you need to use the CAN Open protocol, first we look at the back side of the PCB board, you can see the Pads below,

Note

The picture shows another board, but it doesn't matter, the operation method is the same.

These pads are connected to the OBD side by default. We have to prepare a knife to disconnect the OBD side, and then use an electric soldering iron to solder the CAN Open side of the pads.

Pin map

Note

  • The FREE pin is available for the other usages.

Dimensions

Getting Started


Here's a simple example to show you how CAN-BUS Shield works. In this example we need 2 pieces of CAN-BUS Shields as well as Longan Core 01 (or others Arduino UNO like board).

Note

This example is built under Arduino IDE version 1.8.10.

STEP1: What do we need

Name Function Qty Link
CAN Bus Shield CAN Bus communication 2 GET ONE NOW
Longan Core 01 Controller 2 GET ONE NOW

STEP2: Hardware Connection

Insert each CAN-BUS Shield into Longan Core 01 (or others Arduino UNO like board), and connect the 2 CAN-BUS Shield together via 2 jumper wires. Shown as below images.

Note

CAN_H to CAN_H, CAN_L to CAN_L

STEP3: Software

Please follow how to install an arduino library procedures to install CAN BUS shield library.

Click library for CAN Bus Shield to download the library.

Install the library to your Arduino IDE when it is downloaded.

One of the node (a node means Longan Core 01 + CAN_BUS Shield) acts as master, the other acts as slaver. The master will send data to slaver constantly.

Note

Each node can act as master before the code being uploaded.

Open the send example (File > Examples > Longan_CAN_MCP2515 > send) and upload to the master.

Open the recv example (File > Examples > Longan_CAN_MCP2515 > recv) and upload to the slaver.

STEP4: View Result

Open the Serial Monitor of Arduino IDE(slaver), you will get the data sent from the master.

Schematic Online Viewer

FAQ


How to find the tech support

Please contact support@longan-labs.cc for technical support. Our technical support engineer will usually reply you within 24 hours on working days. In order to get faster support, we hope that when you send us an email, you need to include at least the following content,

  • When and how to buy the product
  • Product version information
  • Take a high-definition picture of the product you use, including the connection
  • Describe in detail the problem you encountered and what kind of help you would like to get

Resources