DRWI Sites with a Mayfly 1.x and EnviroDIY LTE Bee

Example sketch for using the EnviroDIY SIM7080G LTE cellular module with an EnviroDIY Mayfly Data Logger.

This example uses the sensors and equipment used by most groups participating in the DRWI (Delaware River Watershed Initiative) Citizen Science project with the Stroud Water Research Center. It includes a Meter Hydros 21 (CTD) and a SIM7080G-based EnviroDIY LTEbee for communication. This examples also makes use of the on-board light, temperature, and humidity sensors on the Mayfly 1.x. The results are saved to the SD card and posted to the Monitor My Watershed data portal. Only to be used with newer Mayfly v1.0 and v1.1 boards.

The exact hardware configuration used in this example:

  • Mayfly v1.x board
  • EnviroDIY SIM7080 LTE module (with Hologram SIM card)
  • Hydros21 CTD sensor

An EnviroDIY LTE SIM7080 module can be used with the older Mayfly v0.5b boards if you change line 101 (for modemVccPin) from 18 to -1. This is because the Mayfly v1.x board has a separate 3.3v regulator to power the Bee socket and is controlled by turning pin 18 on or off. Mayfly v0.5b has the Bee socket constantly powered, therefore using "-1" is the proper setting for that line of code.

The EnviroDIY LTE SIM7080 module includes 2 antennas in the package. The small thin one is the cellular antenna, and should be connected to the socket labeled "CELL". The thicker block is the GPS antenna, and should be connected to the "GPS" socket, but only if you intend to use the GPS functionality of the module. ModularSensors does not currently suport GPS functionality, but other libraries such as TinyGPS can work with the SIM7080 module.

The included cell antenna works best in high-signal-strength areas. For most remote areas and logger deployments, we suggest a larger LTE antenna, like the W3907B0100 from PulseLarsen (Digikey 1837-1003-ND or Mouser 673-W3907B0100)

Users purchasing a new Hydros21 CTD sensor will need to change the SDI-12 address of the sensor in order to use this sketch. Full instructions for using this sketch as part of a monitoring station can be found in the EnviroDIY Monitoring Station Manual.



Unique Features of the DRWI Mayfly 1.x LTE Example

  • Specifically for sites within the Delaware River Watershed Initiative.
  • Uses a EnviroDIY LTE Bee based on the SIMCom SIM7080G

PlatformIO Configuration

1; PlatformIO Project Configuration File
2;
3; Build options: build flags, source filter
4; Upload options: custom upload port, speed and extra flags
5; Library options: dependencies, extra library storages
6; Advanced options: extra scripting
7;
8; Please visit documentation for the other options and examples
9; http://docs.platformio.org/page/projectconf.html
10
11[platformio]
12description = ModularSensors example intended for DRWI users with CTD and a EnviroDIY SIM7080G LTE modem
13
14[env:mayfly]
15monitor_speed = 57600
16board = mayfly
17platform = atmelavr
18framework = arduino
19lib_ldf_mode = deep+
20lib_ignore =
21 RTCZero
22 Adafruit NeoPixel
23 Adafruit GFX Library
24 Adafruit SSD1306
25 Adafruit ADXL343
26 Adafruit STMPE610
27 Adafruit TouchScreen
28 Adafruit ILI9341
29build_flags =
30 -DSDI12_EXTERNAL_PCINT
31lib_deps =
32 envirodiy/EnviroDIY_ModularSensors
33; ^^ Use this when working from an official release of the library
34; https://github.com/EnviroDIY/ModularSensors.git#develop
35; ^^ Use this when if you want to pull from the develop branch

The Complete Code

1/** =========================================================================
2 * @example{lineno} DRWI_Mayfly1.ino
3 * @copyright Stroud Water Research Center
4 * @license This example is published under the BSD-3 license.
5 * @author Sara Geleskie Damiano <sdamiano@stroudcenter.org>
6 *
7 * @brief Example for DRWI CitSci LTE sites.
8 *
9 * This example shows proper settings for the following configuration:
10 *
11 * Mayfly v1.0 board
12 * EnviroDIY SIM7080 LTE module (with Hologram SIM card)
13 * Hydros21 CTD sensor
14 *
15 * See [the walkthrough page](@ref example_drwi_mayfly1) for detailed
16 * instructions.
17 *
18 * @m_examplenavigation{example_drwi_mayfly1,}
19 * ======================================================================= */
20
21// ==========================================================================
22// Defines for TinyGSM
23// ==========================================================================
24/** Start [defines] */
25#ifndef TINY_GSM_RX_BUFFER
26#define TINY_GSM_RX_BUFFER 64
27#endif
28#ifndef TINY_GSM_YIELD_MS
29#define TINY_GSM_YIELD_MS 2
30#endif
31/** End [defines] */
32
33// ==========================================================================
34// Include the libraries required for any data logger
35// ==========================================================================
36/** Start [includes] */
37// The Arduino library is needed for every Arduino program.
38#include <Arduino.h>
39
40// Include the main header for ModularSensors
41#include <ModularSensors.h>
42/** End [includes] */
43
44
45// ==========================================================================
46// Data Logging Options
47// ==========================================================================
48/** Start [logging_options] */
49// The name of this program file
50const char* sketchName = "DRWI_Mayfly1.ino";
51// Logger ID, also becomes the prefix for the name of the data file on SD card
52const char* LoggerID = "XXXXX";
53// How frequently (in minutes) to log data
54const uint8_t loggingInterval = 15;
55// Your logger's timezone.
56const int8_t timeZone = -5; // Eastern Standard Time
57// NOTE: Daylight savings time will not be applied! Please use standard time!
58
59// Set the input and output pins for the logger
60// NOTE: Use -1 for pins that do not apply
61const int32_t serialBaud = 57600; // Baud rate for debugging
62const int8_t greenLED = 8; // Pin for the green LED
63const int8_t redLED = 9; // Pin for the red LED
64const int8_t buttonPin = 21; // Pin for debugging mode (ie, button pin)
65const int8_t wakePin = 31; // MCU interrupt/alarm pin to wake from sleep
66// Mayfly 0.x, 1.x D31 = A7
67const int8_t sdCardPwrPin = -1; // MCU SD card power pin
68const int8_t sdCardSSPin = 12; // SD card chip select/slave select pin
69const int8_t sensorPowerPin = 22; // MCU pin controlling main sensor power
70/** End [logging_options] */
71
72
73// ==========================================================================
74// Wifi/Cellular Modem Options
75// ==========================================================================
76/** Start [sim_com_sim7080] */
77// For almost anything based on the SIMCom SIM7080G
78#include <modems/SIMComSIM7080.h>
79
80// Create a reference to the serial port for the modem
81HardwareSerial& modemSerial = Serial1; // Use hardware serial if possible
82const int32_t modemBaud = 9600; // SIM7080 does auto-bauding by default, but
83 // for simplicity we set to 9600
84
85// Modem Pins - Describe the physical pin connection of your modem to your board
86// NOTE: Use -1 for pins that do not apply
87
88const int8_t modemVccPin = 18;
89// MCU pin controlling modem power --- Pin 18 is the power enable pin for the
90// bee socket on Mayfly v1.0, use -1 if using Mayfly 0.5b or if the bee socket
91// is constantly powered (ie you changed SJ18 on Mayfly 1.x to 3.3v)
92const int8_t modemStatusPin = 19; // MCU pin used to read modem status
93const int8_t modemSleepRqPin = 23; // MCU pin for modem sleep/wake request
94const int8_t modemLEDPin = redLED; // MCU pin connected an LED to show modem
95 // status
96
97// Network connection information
98const char* apn =
99 "hologram"; // APN connection name, typically Hologram unless you have a
100 // different provider's SIM card. Change as needed
101
102// Create the modem object
103SIMComSIM7080 modem7080(&modemSerial, modemVccPin, modemStatusPin,
104 modemSleepRqPin, apn);
105// Create an extra reference to the modem by a generic name
106SIMComSIM7080 modem = modem7080;
107/** End [sim_com_sim7080] */
108
109
110// ==========================================================================
111// Using the Processor as a Sensor
112// ==========================================================================
113/** Start [processor_sensor] */
114#include <sensors/ProcessorStats.h>
115
116// Create the main processor chip "sensor" - for general metadata
117const char* mcuBoardVersion = "v1.1";
118ProcessorStats mcuBoard(mcuBoardVersion);
119/** End [processor_sensor] */
120
121
122// ==========================================================================
123// Maxim DS3231 RTC (Real Time Clock)
124// Built in on all versions of the Mayfly
125// ==========================================================================
126/** Start [ds3231] */
127#include <sensors/MaximDS3231.h>
128
129// Create a DS3231 sensor object
130MaximDS3231 ds3231(1);
131/** End [ds3231] */
132
133
134// ==========================================================================
135// Everlight ALS-PT19 Ambient Light Sensor
136// Built in on Mayfly 1.x
137// ==========================================================================
138/** Start [everlight_alspt19] */
139#include <sensors/EverlightALSPT19.h>
140
141// Create a Everlight ALS-PT19 sensor object
142// For an EnviroDIY Mayfly, you can use the abbreviated version
143const uint8_t alsNumberReadings = 10;
144EverlightALSPT19 alsPt19(alsNumberReadings);
145/** End [everlight_alspt19] */
146
147
148// ==========================================================================
149// Sensirion SHT4X Digital Humidity and Temperature Sensor
150// Built in on Mayfly 1.x
151// ==========================================================================
152/** Start [sensirion_sht4x] */
153#include <sensors/SensirionSHT4x.h>
154
155// NOTE: Use -1 for any pins that don't apply or aren't being used.
156const int8_t SHT4xPower = sensorPowerPin; // Power pin
157const bool SHT4xUseHeater = true;
158
159// Create an Sensirion SHT4X sensor object
160SensirionSHT4x sht4x(SHT4xPower, SHT4xUseHeater);
161/** End [sensirion_sht4x] */
162
163
164// ==========================================================================
165// Meter Hydros 21 Conductivity, Temperature, and Depth Sensor
166// ==========================================================================
167/** Start [hydros21] */
168#include <sensors/MeterHydros21.h>
169
170const char* hydrosSDI12address = "1"; // The SDI-12 Address of the Hydros 21
171const uint8_t hydrosNumberReadings = 6; // The number of readings to average
172const int8_t SDI12Power = sensorPowerPin; // Power pin (-1 if unconnected)
173const int8_t SDI12Data = 7; // The SDI12 data pin
174
175// Create a Meter Hydros 21 sensor object
176MeterHydros21 hydros(*hydrosSDI12address, SDI12Power, SDI12Data,
177 hydrosNumberReadings);
178/** End [hydros21] */
179
180
181/* clang-format off */
182// ==========================================================================
183// Creating the Variable Array[s] and Filling with Variable Objects
184// ==========================================================================
185/** Start [variable_arrays] */
186Variable* variableList[] = {
187 new MeterHydros21_Cond(&hydros), // Specific conductance (Meter_Hydros21_Cond)
188 new MeterHydros21_Depth(&hydros), // Water depth (Meter_Hydros21_Depth)
189 new MeterHydros21_Temp(&hydros), // Temperature (Meter_Hydros21_Temp)
190 new SensirionSHT4x_Humidity(&sht4x), // Relative humidity (Sensirion_SHT40_Humidity)
191 new SensirionSHT4x_Temp(&sht4x), // Temperature (Sensirion_SHT40_Temperature)
192 new EverlightALSPT19_Illuminance(&alsPt19), // Illuminance (Everlight_AnalogALS_Illuminance)
193 new MaximDS3231_Temp(&ds3231), // Temperature (Maxim_DS3231_Temp)
194 new ProcessorStats_Battery(&mcuBoard), // Battery voltage (EnviroDIY_Mayfly_Batt)
195 new Modem_SignalPercent(&modem), // Percent full scale (EnviroDIY_LTEB_SignalPercent)
196};
197
198// All UUID's, device registration, and sampling feature information can be
199// pasted directly from Monitor My Watershed.
200// To get the list, click the "View token UUID list" button on the upper right
201// of the site page.
202
203// *** CAUTION --- CAUTION --- CAUTION --- CAUTION --- CAUTION ***
204// Check the order of your variables in the variable list!!!
205// Be VERY certain that they match the order of your UUID's!
206// Rearrange the variables in the variable list ABOVE if necessary to match!
207// Do not change the order of the variables in the section below.
208// *** CAUTION --- CAUTION --- CAUTION --- CAUTION --- CAUTION ***
209
210// Replace all of the text in the following section with the UUID array from
211// MonitorMyWatershed
212// --------------------- Beginning of Token UUID List ---------------------
213
214
215const char* UUIDs[] = // UUID array for device sensors
216 {
217 "12345678-abcd-1234-ef00-1234567890ab", // Specific conductance (Meter_Hydros21_Cond)
218 "12345678-abcd-1234-ef00-1234567890ab", // Water depth (Meter_Hydros21_Depth)
219 "12345678-abcd-1234-ef00-1234567890ab", // Temperature (Meter_Hydros21_Temp)
220 "12345678-abcd-1234-ef00-1234567890ab", // Relative humidity (Sensirion_SHT40_Humidity)
221 "12345678-abcd-1234-ef00-1234567890ab", // Temperature (Sensirion_SHT40_Temperature)
222 "12345678-abcd-1234-ef00-1234567890ab", // Illuminance (Everlight_AnalogALS_Illuminance)
223 "12345678-abcd-1234-ef00-1234567890ab", // Temperature (Maxim_DS3231_Temp)
224 "12345678-abcd-1234-ef00-1234567890ab", // Battery voltage (EnviroDIY_Mayfly_Batt)
225 "12345678-abcd-1234-ef00-1234567890ab", // Percent full scale (EnviroDIY_LTEB_SignalPercent)
226};
227const char* registrationToken = "12345678-abcd-1234-ef00-1234567890ab"; // Device registration token
228const char* samplingFeature = "12345678-abcd-1234-ef00-1234567890ab"; // Sampling feature UUID
229
230
231// ----------------------- End of Token UUID List -----------------------
232/* clang-format on */
233
234// Count up the number of pointers in the array
235int variableCount = sizeof(variableList) / sizeof(variableList[0]);
236
237// Create the VariableArray object
238VariableArray varArray(variableCount, variableList, UUIDs);
239/** End [variable_arrays] */
240
241
242// ==========================================================================
243// The Logger Object[s]
244// ==========================================================================
245/** Start [loggers] */
246// Create a new logger instance
247Logger dataLogger(LoggerID, loggingInterval, &varArray);
248/** End [loggers] */
249
250
251// ==========================================================================
252// Creating Data Publisher[s]
253// ==========================================================================
254/** Start [publishers] */
255// Create a data publisher for the Monitor My Watershed/EnviroDIY POST endpoint
256#include <publishers/EnviroDIYPublisher.h>
257EnviroDIYPublisher EnviroDIYPOST(dataLogger, &modem.gsmClient,
258 registrationToken, samplingFeature);
259/** End [publishers] */
260
261
262// ==========================================================================
263// Working Functions
264// ==========================================================================
265/** Start [working_functions] */
266// Flashes the LED's on the primary board
267void greenredflash(uint8_t numFlash = 4, uint8_t rate = 75) {
268 for (uint8_t i = 0; i < numFlash; i++) {
269 digitalWrite(greenLED, HIGH);
270 digitalWrite(redLED, LOW);
271 delay(rate);
272 digitalWrite(greenLED, LOW);
273 digitalWrite(redLED, HIGH);
274 delay(rate);
275 }
276 digitalWrite(redLED, LOW);
277}
278
279// Reads the battery voltage
280// NOTE: This will actually return the battery level from the previous update!
281float getBatteryVoltage() {
282 if (mcuBoard.sensorValues[0] == -9999) mcuBoard.update();
283 return mcuBoard.sensorValues[0];
284}
285
286
287// ==========================================================================
288// Arduino Setup Function
289// ==========================================================================
290/** Start [setup] */
291void setup() {
292 // Start the primary serial connection
293 Serial.begin(serialBaud);
294
295 // Print a start-up note to the first serial port
296 Serial.print(F("Now running "));
297 Serial.print(sketchName);
298 Serial.print(F(" on Logger "));
299 Serial.println(LoggerID);
300 Serial.println();
301
302 Serial.print(F("Using ModularSensors Library version "));
303 Serial.println(MODULAR_SENSORS_VERSION);
304 Serial.print(F("TinyGSM Library version "));
305 Serial.println(TINYGSM_VERSION);
306 Serial.println();
307
308 // Start the serial connection with the modem
309 modemSerial.begin(modemBaud);
310
311 // Set up pins for the LED's
312 pinMode(greenLED, OUTPUT);
313 digitalWrite(greenLED, LOW);
314 pinMode(redLED, OUTPUT);
315 digitalWrite(redLED, LOW);
316 // Blink the LEDs to show the board is on and starting up
317 greenredflash();
318
319 pinMode(20, OUTPUT); // for proper operation of the onboard flash memory
320 // chip's ChipSelect (Mayfly v1.0 and later)
321
322 // Set the timezones for the logger/data and the RTC
323 // Logging in the given time zone
324 Logger::setLoggerTimeZone(timeZone);
325 // It is STRONGLY RECOMMENDED that you set the RTC to be in UTC (UTC+0)
326 Logger::setRTCTimeZone(0);
327
328 // Attach the modem and information pins to the logger
329 dataLogger.attachModem(modem);
330 modem.setModemLED(modemLEDPin);
331 dataLogger.setLoggerPins(wakePin, sdCardSSPin, sdCardPwrPin, buttonPin,
332 greenLED);
333
334 // Begin the logger
335 dataLogger.begin();
336
337 // Note: Please change these battery voltages to match your battery
338 // Set up the sensors, except at lowest battery level
339 if (getBatteryVoltage() > 3.4) {
340 Serial.println(F("Setting up sensors..."));
341 varArray.setupSensors();
342 }
343
344 /** Start [setup_sim7080] */
345 modem.setModemWakeLevel(HIGH); // ModuleFun Bee inverts the signal
346 modem.setModemResetLevel(HIGH); // ModuleFun Bee inverts the signal
347 Serial.println(F("Waking modem and setting Cellular Carrier Options..."));
348 modem.modemWake(); // NOTE: This will also set up the modem
349 modem.gsmModem.setBaud(modemBaud); // Make sure we're *NOT* auto-bauding!
350 modem.gsmModem.setNetworkMode(38); // set to LTE only
351 // 2 Automatic
352 // 13 GSM only
353 // 38 LTE only
354 // 51 GSM and LTE only
355 modem.gsmModem.setPreferredMode(1); // set to CAT-M
356 // 1 CAT-M
357 // 2 NB-IoT
358 // 3 CAT-M and NB-IoT
359 /** End [setup_sim7080] */
360
361
362 // Sync the clock if it isn't valid or we have battery to spare
363 if (getBatteryVoltage() > 3.55 || !dataLogger.isRTCSane()) {
364 // Synchronize the RTC with NIST
365 // This will also set up the modem
366 dataLogger.syncRTC();
367 }
368
369 // Create the log file, adding the default header to it
370 // Do this last so we have the best chance of getting the time correct and
371 // all sensor names correct
372 // Writing to the SD card can be power intensive, so if we're skipping
373 // the sensor setup we'll skip this too.
374 if (getBatteryVoltage() > 3.4) {
375 Serial.println(F("Setting up file on SD card"));
376 dataLogger.turnOnSDcard(
377 true); // true = wait for card to settle after power up
378 dataLogger.createLogFile(true); // true = write a new header
379 dataLogger.turnOffSDcard(
380 true); // true = wait for internal housekeeping after write
381 }
382
383 // Call the processor sleep
384 Serial.println(F("Putting processor to sleep\n"));
385 dataLogger.systemSleep();
386}
387/** End [setup] */
388
389
390// ==========================================================================
391// Arduino Loop Function
392// ==========================================================================
393/** Start [loop] */
394// Use this short loop for simple data logging and sending
395void loop() {
396 // Note: Please change these battery voltages to match your battery
397 // At very low battery, just go back to sleep
398 if (getBatteryVoltage() < 3.4) {
399 dataLogger.systemSleep();
400 }
401 // At moderate voltage, log data but don't send it over the modem
402 else if (getBatteryVoltage() < 3.55) {
403 dataLogger.logData();
404 }
405 // If the battery is good, send the data to the world
406 else {
407 dataLogger.logDataAndPublish();
408 }
409}
410/** End [loop] */