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How can I connect 433 MHz RF receiver to CC3200 LaunchPad?

A D
Intellectual 400 points
Other Parts Discussed in Thread: CC3200

I want to connect one of the two (or both) 433 MHz RF receiver modules to the CC3200 LaunchPad:

I'm a hardware newbie, so I don't know how to connect them and how to address them in CCS.

Can someone please enlighten me on how to connect these with the LaunchPad pins?

I also want to connect an SD Card connector to the LaunchPad at the same time. Is this possible? Is it possible to connect all three devices to the CC3200 LaunchPad at the same time and get each of these addressed?

I guess it would require two additional chips, one to change binary format to dedicated lines (green below) and one 4-way AND gate (blue below):

Is this assumption correct? Or is there already something similar available on the LaunchPad?

Which chips would I require to accomplish the green and blue area?

Your help is appreciated.

  • 0
    Guru 86755 points

    Hi,

        If you have extra GPIO's at your CC3200 Launchpad, you can set those as Slave Select. That way you won't need the additional chips.

        See, tutorials of SPI interface in the internet for more info.

    - kel

  • 0 in reply to Markel Robregado
    Intellectual 400 points

    Thank you for your reply.

    OK, I understand: Using any of the GPIO pins I can select each of the SPI devices on their own.

    Will it be necessary to apply pull-up or pull-down resistors for the SS pin? Or can I just connect the devices immediately?

    There is another non-trivial question bothering me regarding connecting these RF receivers to the LaunchPad:

    The data coming in from the receivers - there is no clock pin or anything else. How will I connect their data pin to the LaunchPad and receive data reliably?

  • 0 in reply to A D
    TI__Genius 11120 points

    Hi

    Regarding the 433MHz module, the data pin has to be connected to one of the UART pins available on the CC3200. This pin can be found from the datasheet for the CC3200 or the pin-mux tool.

    But on the 433MHz transmitter side you would have to use a UART standard so that the CC3200 works correctly with this. You may need to use an inverter in case the default state of the Data Out line from the RF83C IC is LOW.

     

  • 0 in reply to Prajay Madhavan
    Intellectual 400 points

    Thank your for your valuable help.

    The receiver's datasheet reads: "This device is a true 'antenna-in to data-out' monolithic device."

    Since I don't know the format or baud rate of the transmitted signal, is there an option to have the CC3200 UART find the correct parameters itself?

    Or would you suggest in that case to connect the receiver's data out to one of the CC3200 GPIOs so I could scan the signal?

    Your help is very much appreciated.