[Sara Damiano]

I tried to re-word the instructions on GitHub a little and get the link to the zip right so maybe it’s a little less confusing.

[Sara Damiano]

I’m sorry for the hassle. You also cannot use the Arduino IDE’s library manager to directly import the libraries; using “add zip library…” won’t work. You have to follow the longer instructions for manual installation because there are multiple libraries in the same zip. That is, you have to extract (unzip) the libraries.zip file into another folder on you computer and then copy all of the sub-folders into “..\<you>\DOCUMENTS\Arduino\libraries” or where ever your sketchbook libraries are stored on your computer.

[Sara Damiano]

If you would like your sensors added to the ModularSensors library, please create an issue for them there!

[Sara Damiano]

Please, like Shannon suggested, copy in your actual code using the “Add Code Snippet” button and actually attach your raw data, not a picture of it. Also, like Shannon said, please plot your EA and temperature to see how they look. And, again, like Shannon said, explain:

How were you testing the sensor? Was is installed outside or in a controlled environment? What kind of results were you expecting and what makes you think something is inconsistent?

[Sara Damiano]

I got and accepted your pull request. The fix is in the library now.

[Sara Damiano]

One more thing: If you’re going to use your Mayfly as a logger, make sure you set the real time clock first! I’ve written a sketch and tiny executable to synchronize the Mayfly with your computer clock. You can find it here: https://github.com/EnviroDIY/Sodaq_DS3231/tree/master/examples/PCsync

[Sara Damiano]

Yup, doing the soldering will make your 3.5mm jack connection much prettier and more secure than using the screw terminals. If you’re skilled with a soldering iron, it’s the way to go.

If you’re skill-less and solder-less like I am, the jacks with screw terminals are a solution.

[Sara Damiano]

If you would prefer, you can also look into the Modular Sensors library, which has functions already built into it for getting data from a Decagon CTD, a Decagon ES2, and a Decagon 5TM and then logging that data to a SD card.

If you downloaded the full package of libraries I mentioned in #2134, the Modular Sensors library is already included in it. If not, you download the zip at https://github.com/EnviroDIY/ModularSensors/archive/master.zip and unzip that for the Arduino IDE or install in PlatformIO using “pio lib -g install https://github.com/EnviroDIY/ModularSensors.git&#8221;.

[Sara Damiano]

Now that your sensor is connected and has an address set, you can get data from it using code like this:

C++

SDI12 mySDI12(_dataPin); mySDI12.begin(); delay(500); // allow things to settle myCommand = ""; myCommand += _SDI12address; myCommand += "M!"; // SDI-12 measurement myCommand format [address]['M'][!] mySDI12.sendCommand(myCommand); Serial.println(myCommand); // For debugging delay(30); // wait for acknowlegement with format [address][ttt (3 char, seconds)][number of measurments available, 0-9] sdiResponse = ""; while (mySDI12.available()) // build response string { char c = mySDI12.read(); if ((c != '\n') && (c != '\r')) { sdiResponse += c; delay(5); } } mySDI12.flush(); // find out how long we have to wait (in seconds). unsigned int wait = 0; wait = sdiResponse.substring(1,4).toInt(); Serial.print(F("Waiting ")); // For debugging Serial.print(wait); // For debugging Serial.println(F(" seconds for measurement")); // For debugging // Set up the number of results to expect numMeasurements = sdiResponse.substring(4,5).toInt(); Serial.print(numMeasurements); // For debugging Serial.println(F(" results expected")); // For debugging unsigned long timerStart = millis(); while((millis() - timerStart) < (1000 * wait)) { if(mySDI12.available()) // sensor can interrupt us to let us know it is done early { Serial.println("Wait interrupted!"); // For debugging mySDI12.flush(); break; } } delay(30); mySDI12.flush(); Serial.println(F("Requesting data")); // For debugging myCommand = ""; myCommand += _SDI12address; myCommand += "D0!"; // SDI-12 command to get data [address][D][dataOption][!] mySDI12.sendCommand(myCommand); Serial.println(myCommand); // For debugging delay(30); Serial.println(F("Receiving data")); // For debugging mySDI12.read(); // ignore the repeated SDI12 address float sensorValues[numMeasurements] = {0}; // Create an array to receive data for (int i = 0; i < numMeasurements; i++) { float result = mySDI12.parseFloat(); sensorValues[i] += result; Serial.print(F("Result #")); // For debugging Serial.print(i); // For debugging Serial.print(F(": ")); // For debugging Serial.println(result); // For debugging } // Wait for and discard anything else mySDI12.flush();

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71

SDI12 mySDI12(_dataPin); mySDI12.begin(); delay(500); // allow things to settle   myCommand = ""; myCommand += _SDI12address; myCommand += "M!"; // SDI-12 measurement myCommand format  [address]['M'][!] mySDI12.sendCommand(myCommand); Serial.println(myCommand);  // For debugging delay(30);   // wait for acknowlegement with format [address][ttt (3 char, seconds)][number of measurments available, 0-9] sdiResponse = ""; while (mySDI12.available())  // build response string {     char c = mySDI12.read();     if ((c != '\n') && (c != '\r'))     {         sdiResponse += c;         delay(5);     } } mySDI12.flush();   // find out how long we have to wait (in seconds). unsigned int wait = 0; wait = sdiResponse.substring(1,4).toInt(); Serial.print(F("Waiting "));  // For debugging Serial.print(wait);  // For debugging Serial.println(F(" seconds for measurement"));  // For debugging   // Set up the number of results to expect numMeasurements =  sdiResponse.substring(4,5).toInt(); Serial.print(numMeasurements);  // For debugging Serial.println(F(" results expected"));  // For debugging   unsigned long timerStart = millis(); while((millis() - timerStart) < (1000 * wait)) {     if(mySDI12.available())  // sensor can interrupt us to let us know it is done early     {         Serial.println("Wait interrupted!");  // For debugging         mySDI12.flush();         break;     } } delay(30); mySDI12.flush();   Serial.println(F("Requesting data"));  // For debugging myCommand = ""; myCommand += _SDI12address; myCommand += "D0!";  // SDI-12 command to get data [address][D][dataOption][!] mySDI12.sendCommand(myCommand); Serial.println(myCommand);  // For debugging delay(30);   Serial.println(F("Receiving data"));  // For debugging mySDI12.read();  // ignore the repeated SDI12 address float sensorValues[numMeasurements] = {0};  // Create an array to receive data for (int i = 0; i < numMeasurements; i++) {     float result = mySDI12.parseFloat();     sensorValues[i] += result;     Serial.print(F("Result #"));  // For debugging     Serial.print(i);  // For debugging     Serial.print(F(": "));  // For debugging     Serial.println(result);  // For debugging } // Wait for and discard anything else mySDI12.flush();

Once you have an array of values from the sensor, you can save them to an SD card or anything you’d like.

[Sara Damiano]

The next step is to set the SDI-12 address of the sensor. Communication with the sensor depends on its 1-character alphanumeric address (1-9, A-Z, a-z). Unfortunately, Decagon ships all of its sensors programmed to an SDI-12 address of 0, which cannot be used to get measurements from the sensor.

Within the SDI-12 library on GitHub, there is an example with instructions for changing the address. Find it here: https://github.com/EnviroDIY/Arduino-SDI-12/tree/master/examples/b_address_change

[Author]

Posts