On the UNO R4 Minima with 3.3 Volt CAN transceiver I have problems with receiving from the CAN bus. Setup works fine but nothing happens after that.
However after a change to a 5V MCP2551 transceiver all works fine.
My understanding is that the UNO R4 is 5Volt tolerant so this should not be a problem... ?!
I also connected a resistor "level converter" and at 3.3 Volt input to pin5 on UNO R4 Minima and nothing is received.
In the documentation from Karl Söderby there is a 3.3 V transceiver. Is this correct ?
Hey, im also using the MCP2551 transceiver for my project, but I'm having some difficulty either receiving or sending the message. I'm trying to use the example code from arduino made by Karl Söderby, but the receiving end prints nothing and the sending one gives me the error code: -60003. May I ask did you use the same functions as in the example or some other to get it to work with the MCP2551?
You propably already found out, but yes the SN65HVD230 is a 3.3V transceiver and I think it requires a level converter.
It sounds like problems in the physical layer. Post a schematic showing how all of this is connected. Be sure to include all parts, caps, resistors, etc and how it is powered.