Making a CAN Bus monitor #CAN @technoblogy

Technoblogy presents a simple CAN Bus monitor that displays information about the packets on a CAN Bus. It’s based on an Adafruit ESP32 Feather, a CAN Bus Transceiver, and a 240×135 TFT Display. Tested by sending packets from an Adafruit Feather M4 CAN Express board, based on an ATSAME51.

The CAN Bus monitor reads each packet on the bus and displays it on a colour TFT 240×135 display. For each packet the following information is displayed:

  • No: The packet number since monitoring started, displayed in decimal.
  • PacketID: The packet ID; an 11-bit identifier for standard packets, or a 29-bit identifier for extended packets, displayed in hexadecimal.
  • Data Hexadecimal: Up to eight bytes of data, displayed in hexadecimal.
  • Data ASCII: The same data shown in ASCII.

I tested the CAN Bus Monitor using an Adafruit Feather M4 CAN Express [10] to generate packets, by running a test program based on their feather_m4can_tx example. It uses the Adafruit CAN Library, which is based on Sandeep Mistry’s library.

See more in the post here.

 


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