I want to do CAN bus communication between 2 ESP32. I have seen several references, but because of my limited understanding of programming, I am confused.I use the mcp2515 module, with many references and libraries out there, but I chose to use this library mcp_can and I also use this program // ES…

[image] delta_667: ESP32 ESP32 already come with x1 CAN channel! have a look at this you tube tutorial :wink: Making a CAN Bus on a breadboard with two ESP32 microcontrollers! all relevant material available on the video links. hope that helps...

I've seen this reference before. in this reference it means can channel, namely pins 4 and 0 on the esp32 or is there something else? and dont need mcp2515 just tja1050?

[image] delta_667: I've seen this reference before. in this reference it means can channel, namely pins 4 and 0 on the esp32 or is there something else? and dont need mcp2515 just tja1050? off you asking me this question if you watch the youtube but anyway... yes, that would be using the ESP…

with your suggestion it has succeeded but there is still a little error I think in terms of electrical. I connect all the electrical with jumper cables and when reading while I press the cable and sometimes it works. currently I only short terminal j1 where there is a 120 resistor for CANH, CANL. is…

sounds like you may have a poor connection jumper cables between modules are a source of poor connections and intermittent problems check each cable in turn and replace any which cause problems the canbus should be terminated with a 120ohm resistor at each end - test between CANH and CANL with a …

[image] horace: you can use a pair of MCP2515 modules or TWAI interface driving cjmcu-1051 (or similar) transceivers Presumably (for testing and code development purposes) you can just cross connect the TWAI interface TX & RX pins between the two ESP32 devices?

[image] gfvalvo: Presumably (for testing and code development purposes) you can just cross connect the TWAI interface TX & RX pins between the two ESP32 devices? never attempted that - always connected the ESP32s to transceivers then to other devices with CANBUS interfaces

i have tried it and it works thanks, i did not change the rx and tx pins in the program to 4 and 0 but still it as 21 22 like in example on website

I want to do CAN bus communication between 2 ESP32

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horace December 17, 2024, 12:54pm 4

have a look at using-two-esp32-boards-and-2-mcp2515-boards-to-communicate-over-can-not-receiving-anything
you can use a pair of MCP2515 modules or TWAI interface driving cjmcu-1051 (or similar) transceivers

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I want to do CAN bus communication between 2 ESP32

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