Danny Waz

Update 3: Looks like EnviroDIY has merged my backward-compatible slave-side additions into their main library, so you don’t need my fork if you have the latest version. See example “g” for a slave implementation.

The code is publicly available in my GitHub (link). For it to work, you will need my fork of the EnviroDIY SDI-12 library in your Arduino/libraries folder. At the time of this comment, it is ahead of EnviroDIY:master and fully backward-compatible, so it will not break your old sketches if you are already using that library.

@shicks I assume you have been busy and this hasn’t happened yet… I’d like to start playing around with the GPRSbee on my own. Any recommendation on which Rev to buy and where to buy it?

Update 2: I have posted the modified library and an example implementation sketch in a fork off of the EnviroDIY Arduino-SDI-12 repository.

https://github.com/dwasielewski/Arduino-SDI-12

Pardon the somewhat off-topic response, but regarding reading serial data I have found this post extremely helpful. Both of the examples above hold the loop() hostage until the whole string comes in. That’s okay in a small, single-sensor sketch, but it is susceptible to (a) truncating the string if the arduino gets ahead of the incoming data and…[Read more]

According to the datasheet, the “RS232” models MB736x are 0-Vcc (typical RS232 is -13V to +13V). Of course, it will be inverted from TTL, but if you account for that in your softwareSerial constructor, I do not see why you should need an external converter (MAX232 or similar). In fact, the converter might cause problems if it’s shifting the…[Read more]

Thanks, @shicks. I will look into those too. I am glad to hear you are planning a tutorial already.

Thanks for the links. Of these, the NimbeLink Skywire looks most like what I was imagining. The FONA boards have some promise, but the Adafruit library does not support data yet for the linked 3G version. I would consider a cell modem like the Raven a good option for a remote system based on a full-fledged computer (say, an RPi or NUC), but it…[Read more]

I should mention that when I was about 90% done with it, I discovered Vegetronix offers something similar off-the-shelf. However, I am benefiting from some advantages to my approach:
1. It is customizable, which is especially useful for integration into custom applications on the host PC
2. Total cost was ~$15

You are not missing something. It would be more accurate to say “ultrasonic stage height sensors”, because depth is merely retrieved, not sensed. This is problematic when one cannot easily survey the sensor as you said, even more problematic for sensing streams with moving beds. Presently, something like a pressure transducer can measure depth…[Read more]

Update: I have succeeded in making an SDI-12 slave device on an Arduino Nano, but I have more work to do before my code can be generalized and distributed.

The project linked by GS is not really a slave-side library but rather an attempt to build a sketch implementing an SDI-12 slave with the SWRC’s SDI-12 master library. This did not work for…[Read more]

Thanks! It will be a few weeks before I get a chance to try out this library live, but at first glance it appears to be almost exactly what I was planning to make.

Before I get to the questions, let’s look at the battery issue. Reading between the lines, I’m assuming you actually want a 1.2 V power supply, not a 2.4 V supply. If that’s the case, then yes, wiring your 3 AAs in parallel will work and increase the capacity. That said, I’m curious as to what you are powering off of 1.2 V. Any Arduino-based…[Read more]