Arduino CAN LCD

This is a simple example using an Arduino to display on a I²C LCD some information coming from the CAN bus over SPI with a MCP2515 controller, and sending CAN frames when the buttons are pressed.

Hardware parts

• Arduino
• Grove RGB backlight: http://wiki.seeedstudio.com/Grove-LCD_RGB_Backlight/
• CAN shield: https://www.sparkfun.com/products/13262

Required libraries

• https://github.com/Seeed-Studio/Grove_LCD_RGB_Backlight
• https://github.com/sparkfun/SparkFun_CAN-Bus_Arduino_Library

Examples

Below are some examples of can-utils calls to send CAN frames to the Arduino through the can0 device of a Linux host.

Set the HVAC information to AC on and temperature 19°C

$ cansend can0 100#0113

Display "hello world!" on the first line

$ cansend can0 200#48656c6c6f20776f
$ cansend can0 201#726c642120202020

Change the LCD backlight color to green

$ cansend can0 300#00ff00

View the CAN frames sent when pressing a button

$ candump can0
  can0  400   [8]  00 01 02 03 04 05 06 07
  can0  404   [8]  00 01 02 03 04 05 06 07
  ...