An instrument at work outputs data on CANbus. I used an MCP2515 CAN Bus Module TJA1050 Receiver to decode enough to get the data I want to log. The mcp_can library reader program gives result like this ID: 413 DLC: 8 Data: 00 05 21 33 00 00 B2 A2 The 8 different IDs are 4 parameters (TMP, CO2, H…

Post a annotated schematic of your setup. Be sure to include all connections, power, ground, power sources etc. Also show any other components such as resistors. Is is possibly you have CAN-H and CAN-L swapped?

The level shifter I am using is from Amazon. https://www.amazon.com/dp/B07QTKZSBT There isn't corruption of the CAN message data for the ESP8266 Node MCU version of the code. The rxId is consistent in that there are only 8 Ids- not many different ones. The attached png shows the breadboard. Powe…

CAN BUS data difference from UNO to ESP8266

Projects Networking, Protocols, and Devices

mikb55 April 24, 2025, 2:54pm 2

Does your level shifter have the bandwidth to handle the SPI signal?
The SPI link doesn't have any error checking so data corruption just results in bad data at the receiving end.

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CAN BUS data difference from UNO to ESP8266

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