CAN Bus signals on a breadboard with ESP32 microcontroller and Oscilloscope

In this video, I use a pocket-sized oscilloscope to measure CAN signals on a breadboard. The system consists of two ESP32 microcontrollers, each connected to a TJA1050 CAN transceiver. I use an open-source Arduino library for CAN communication.

The primary objective of this experiment is to determine if using 5V CAN transceivers with 3.3V microcontrollers is safe. As a bonus, we get to see the voltage levels adhere to the CAN protocol in real life. Enjoy!

[TJA1050 CAN TRANSCEIVER DATASHEET]

[Great article on CAN]

[Arduino ESP32 CAN library]

[ESP32 Dev Module]

[CAN Bus Module Transceiver]

[bennguyen]

I understand trc2csv exists, but do you know if it's possible to convert a trc capture (I have a peak usb interface) to an asc or log format?

For example, python-can logconvert doesn't seem to support trc.. the only way might be to do in multiple steps?
1) canlogconvert from trc to asc
2) logconvert to go from asc to log
3) Once it's in log format, it can be converted to csv using Log-CANverter ... or log plotted using cantools

[redmundperrz]

Thanks for the can bus series video, now i know a little bit about voltage swing and in conclusion we can now use that setup together with arduino and MCP2515 transciever so they can communicate?

[imanuelpundoko]

do you ever tried NodeMCU esp8266 with mcp2515? or anyone have any experience to interfacing the esp8266 with mcp2515

[marcelshasa]

I really enjoyed your video :)
I was wondering if the CAN transceiver is really necessary for applications where the CAN nodes are close to each other with a distance of approximatively 20 cm (it would be for a communication between a dsPIC and a ESP32) ?

[PremKumar-expm]

I connected one esp32 with one tja1050, the other side of tja1050 i.e CANH and CANL i have connected to one of the can network.
i see that i am not getting any output i.e rx signals to esp32

could you suggest something on this error

[jeffreyrh]

That library does not work with the ESP32 S3. Any ideas how to make this work on the S3?

[tomek]

Thanks for video. So the result is that you can use TJA with power supply 5V, but with a resistor or without? If with resistor, than which one?

[robfei-ub]

thanks for your video, so if 3.3v from esp32 is not good solution for this can transceiver, what is alternative solution?

[Alperic]

dude … u keep confusing transceivers with transmitters …… 🤦‍♂️