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  • January 27, 2022 at 4:27 pm #8697
     scoutingrobot
    Participant

    Latest update: Comm. works with MAX232 chip perfectly. But its kind of cumbersome electrical setup. A lot of capacitors.

    January 27, 2022 at 1:41 pm #8695
     scoutingrobot
    Participant

    Got a voltage close to 5V using Max232.

    Should I opt for Max3232 instead since it has 3.3V supply and might give a logic level of close to 3.3V ?

    January 27, 2022 at 8:06 am #8694
     scoutingrobot
    Participant

    Hello,

    I tried serial communication with USB from Roboteq to Jetson Nano, worked perfectly.
    But the same with an adapter and the circuit on Pg 179 does not work at all.

    Really stuck right now. Max232 is the last resort.

    January 26, 2022 at 10:09 am #8693
     scoutingrobot
    Participant

    oh sorry about that. Have tried flipping the diodes in either direction but the voltage level at the Rx of NVIDIA still showed 4.95V which I think is a clipped voltage as it cannot take in excess of 4.95V

    January 26, 2022 at 8:32 am #8673
     scoutingrobot
    Participant

    Would a MAX232 chip work for communication?
    I have tried it before with PC and PIC microcontroller and it has worked.

    Only concern is would it bring it down to 0-3.3V logic levels.

    January 25, 2022 at 3:30 pm #8670
     scoutingrobot
    Participant

    I have attached the connection diagram below. Kindly, take a look and let me know if anything is incorrect.

    • This reply was modified 2 years, 10 months ago by scoutingrobot.
    January 25, 2022 at 2:21 pm #8668
     scoutingrobot
    Participant

    Sorry, don’t have an oscilloscope.
    What data can I send to see the motor controller respond?

    January 25, 2022 at 2:05 pm #8666
     scoutingrobot
    Participant

    So, should I run the code and try receiving something to check the voltage at Rx?
    Currently, it is just 0V.

    January 25, 2022 at 1:16 pm #8664
     scoutingrobot
    Participant

    Sorry, in RS232 inverting mode, the voltage measured along the other side of the resistor is around 9V roughly.
    The voltage is only getting dropped across the resistor and the diodes are not affecting the circuit in any form.

    January 25, 2022 at 12:06 pm #8663
     scoutingrobot
    Participant

    Hello,

    I measured the voltages:

    Between Roboteq, TX and GND: -9.19V
    Between NVIDIA, TX and GND: -0.2V

    Shouldn’t I receive 0-3.3V at this other end?

    January 25, 2022 at 12:03 pm #8662
     scoutingrobot
    Participant

    Hello,

    I measured the voltages:
    Roboteq, Tx and Gnd: -9.19V
    NVIDIA, Tx and Gnd: -0.2V

    Why am I receiving a negative voltage near the NVIDIA side?
    Shouldn’t it be 0-3.3V?

    January 25, 2022 at 6:24 am #8661
     scoutingrobot
    Participant

    Yes. It is 4.7k

    January 24, 2022 at 3:49 pm #8659
     scoutingrobot
    Participant

    Could you please help me resolve this issue?

    January 24, 2022 at 3:42 pm #8658
     scoutingrobot
    Participant

    I can still measure 9V after the diode and resistor

    January 24, 2022 at 3:37 pm #8657
     scoutingrobot
    Participant

    And the voltage drop near the diode and rx pin of the microcontroller should measure 3.3V and less?

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