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MSP430F5438 SDI-12 Interfacing

Jeetesh Kumar Tiwari
Intellectual 305 points
Other Parts Discussed in Thread: MSP430F5438

As I am fresher, I don't know how to interface SDI-12 with MSP430F5438 using GPIO. Please  Suggest me... to make it possible...

  • 0
    Expert 1595 points

    Hi,

    The SDI-12 interface uses a single bi directional serial data line that requires 0V and 5V levels. Generally the MSP430 GPIO lines are driven between zero and the processor Vcc, which is normally 3.3V or lower.

    You will therefore need a hardware interface to get the basic voltage levels correct. A quick google search provides http://www.daycounter.com/Circuits/SDI-12/SDI-12-Interface.phtml which looks reasonable.

    Once you have the required hardware you should be able to use the UART in the MSP to assist in generation the required serial bit stream for communications

  • 0 in reply to Roy Deabill
    Prodigy 55 points

    Most of the new sensors from decagon run on 3 volt, so software driver is also a option now,

    is it better to use software based interface or hardware based interface like daycounter circuit  ? 

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