Welcome to EnviroDIY, a community for do-it-yourself environmental science and monitoring. EnviroDIY is part of WikiWatershed, an initiative of Stroud Water Research Center designed to help people advance knowledge and stewardship of fresh water.
New to EnviroDIY? Start here

Reply To: SDI-12 & LT500

Home Forums Mayfly Data Logger SDI-12 & LT500 Reply To: SDI-12 & LT500


    Thanks for the input, ~ Yup that is what did it for interfacing with the LT500.  I brought in each change from Dec 1st till I found it

    Doesn’t make a lot of sense to me why that impacts the protocol, but in dealing with a bug, the first stage is Detection, 2nd stage is Isolation, 3rd stage is Fixing it.

    The Isolation in this case took a couple of days.

    The software process is modify and test, and then integration test. In this case what is lacking (for me)  is having a defined reference for the SDI-12 sensor.  It also seems that working with the LT500, there are retry’s that finally work. So its a general problem with this kind of dispersed protocol testing. USB protocol testing is a lot worse, and they solve it by having plug-fests. But then there is a lot of money in selling USB devices.

    I have been keeping my eyes open for a low cost reference sensor, ideally that would be open source as well, but I haven’t found one yet.

    I’m thinking that for me, since SDI-12 is so fragile, and its not clear how to verify changes except by running them against reference sensors I should manage any changes happening more closely – fork the libs concerned. Just thinking out a loud.