Hello!
Google Gemini states that a transceiver module (I just purchased a pair of SN65HVD230 boards) is not required for the UNO R4 WiFi and that pins D13 & D10 will work adequately for the CANRX & CANTX functions. Is this correct?
Would the same be true for the GIGA WiFi R1? (A14 & A15 for CANRX & CANTX)
Should I connect directly Rx to Tx from one board to the other (and vice versa) for a basic CAN Bus read/write tests without 120 ohms shunt resistors? Thanks.
Regards.
I needed to use a SN65HVD230 pair and change the rate to 500k for the CANwrite (UNO) and CANread(GIGA) to exchange messages successfully.
I guess I experienced first hand that these public LLMs scrape StackOverflow or other places where incorrect information is churned.
Case closed.
Sort of but the process used to make the processor is not compatible with the voltage/current specifications of the CAN bus. A buffer/transceiver supporting dominance / recessive of the bus is required, it is part of the CAN specification. Your chip choice is right on! Check the Arduino specifications at: https://docs.arduino.cc/tutorials/uno-r4-wifi/can/ You will need to scroll down to Circuit where it states how the transceiver is connected.
Thanks again @gilshultz!
You've said it many times in this forum - RTM.
My ignorance was that even after reading that section I was expecting the "bus" to be connected to the UNO and GIGA boards directly. Now I know I just a little bit more about the bus connections thanks to you.
Regards.
That just made my day! Keep at it we are to help you! Have a great week!