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Forum Index : Microcontroller and PC projects : SDI-12 Sensor Comms

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jewmac
Newbie

Joined: 25/07/2019
Location: Australia
Posts: 1

Posted: 12:27pm 25 Jul 2019

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Hi Forum,

Just wanting to know if any members have had successful comms with a SDI-12 sensor using mmbasic.

I am after some code examples if you are willing to share. I have been told that it would need to be a bit bang routine and mmbasic is not capable of doing this and a third party device is required.

However I am sure there a some clever people amongst us who like to prove others wrong and have a little snippet of code to do so.

If you can help I would be very appreciative

Edited by jewmac 2019-07-26

JohnS
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Joined: 18/11/2011
Location: United Kingdom
Posts: 4044

Posted: 02:35pm 25 Jul 2019

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If it's 1200 baud but can't be done using a uart or the like then that's so slow that I expect mmbasic can cope.

(I'm ignoring any hardware issues if there are any, such as voltages.)

JohnEdited by JohnS 2019-07-27

CaptainBoing

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Joined: 07/09/2016
Location: United Kingdom
Posts: 2170

Posted: 03:02pm 25 Jul 2019

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Hey jewmac, welcome to the forum.

There was some discussion a couple of years back for controlling some radiator valves(?) for a smart home using a proprietary protocol. Where as the protocol was decoded, the member had the same problem... I seem to remember that a fellow shedder wrote a CSUB to provide an arbitrary stream of bits, i.e. any protocol could be simulated.

This may give you some ideas?

https://www.thebackshed.com/forum/forum_posts.asp?TID=9353 Edited by CaptainBoing 2019-07-27

TassyJim

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Joined: 07/08/2011
Location: Australia
Posts: 6283

Posted: 01:45am 27 Jul 2019

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This was discussed a couple of years ago
https://www.thebackshed.com/forum/ViewTopic.php?TID=9608&P=1#105532

Getting the 7 bits plus parity is easy enough.
You need to think about the serial interface.

Jim

VK7JH
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OA47

Guru

Joined: 11/04/2012
Location: Australia
Posts: 986

Posted: 07:24am 27 Jul 2019

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Thanks Jim for adding that link. I have had some micromites conversing with SDI-12 probes for a couple of years without issues. Has been difficult to search and get the appropriate discussions as the site has been under repair.

Here is more of the discussion and some example code:

http://www.thebackshed.com/Forum/printer_friendly_posts.asp?TID=9608

OA47

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