Monitor Temperature Humidity Through SMS Using M5Stack and SIM800L

M5StackSIM800LSMS.ino

/*
  Project: Monitor Temperature Humidity Through SMS Using M5Stack and SIM800L
  Board: M5Stack-Core-ESP32
  
  Connections:
  ESP32 | SIM800L
   IO17 - RX
   IO16 - TX
    IO5 - RST
  
  External libraries:
  - M5Stack V0.3.0 (Manager)
  - Adafruit FONA V1.3.8 (Manager)
  - ClosedCube SHT31D V1.5.1 (Manager)
 */

#include <M5Stack.h>
#include <Wire.h>
#include "ClosedCube_SHT31D.h"
#include "Adafruit_FONA.h"

ClosedCube_SHT31D sht3xd;

#define SIM800L_RX     17
#define SIM800L_TX     16
#define SIM800L_RST    5

char replybuffer[255];

HardwareSerial *sim800lSerial = &Serial1;
Adafruit_FONA sim800l = Adafruit_FONA(SIM800L_RST);

uint8_t readline(char *buff, uint8_t maxbuff, uint16_t timeout = 0);

#define BUTTONA 39
#define BUTTONB 38
#define BUTTONC 37
#define SPEAKER 25

#define NOTE_C4  262
#define NOTE_D4  294
#define NOTE_G4  392
#define NOTE_A4  440

#define playReadyMelody() playTone(melody1, melody1Dur, 2)
#define playSMSReceived() playTone(melody2, melody2Dur, 1)
#define playButton2() playTone(melody3, melody3Dur, 1)
#define playBatteryWeak() playTone(melody4, melody1Dur, 2)

int melody1[] = {NOTE_C4, NOTE_G4};
int melody1Dur[] = {12, 8};
int melody2[] = {NOTE_A4};
int melody2Dur[] = {8};
int melody3[] = {NOTE_D4};
int melody3Dur[] = {8};
int melody4[] = {NOTE_G4, NOTE_C4};
int melody4Dur[] = {12, 8};

String smsString = "";

void setup()
{
  pinMode(BUTTONA, INPUT_PULLUP);
  pinMode(BUTTONB, INPUT_PULLUP);
  pinMode(BUTTONC, INPUT_PULLUP);
  pinMode(SPEAKER, OUTPUT);

  M5.begin();
  M5.Power.begin();

  Serial.begin(115200);
  Serial.println(F("ESP32 with GSM SIM800L"));
  Serial.println(F("Initializing....(May take more than 10 seconds)"));

  M5.Lcd.clear(BLACK);
  M5.Lcd.setTextSize(2);
  M5.Lcd.setTextColor(RED);
  M5.Lcd.setCursor(0, 0);
  M5.Lcd.print("** M5STACK SIM800L DEMO **");
  
  M5.Lcd.setTextColor(WHITE);
  M5.Lcd.setCursor(0, 30);
  M5.Lcd.print("Temperature (celsius):");
  M5.Lcd.setTextColor(YELLOW);
  M5.Lcd.setCursor(0, 50);
  M5.Lcd.print("---");

  M5.Lcd.setTextColor(WHITE);
  M5.Lcd.setCursor(0, 80);
  M5.Lcd.print("Humidity (%RH):");
  M5.Lcd.setTextColor(YELLOW);
  M5.Lcd.setCursor(0, 100);
  M5.Lcd.print("---");
  
  M5.Lcd.setTextColor(WHITE);
  M5.Lcd.setCursor(0, 130);
  M5.Lcd.print("Status:");
  M5.Lcd.setTextColor(YELLOW);
  M5.Lcd.setCursor(0, 150);
  M5.Lcd.print("Initialize GSM (10 sec)");
  
  M5.Lcd.setTextColor(WHITE);
  M5.Lcd.setCursor(0, 180);
  M5.Lcd.print("Message:");
  M5.Lcd.setTextColor(YELLOW);
  M5.Lcd.setCursor(0, 200);
  M5.Lcd.print("---");

  Wire.begin();
  sht3xd.begin(0x44); // I2C address: 0x44 or 0x45
  Serial.print("Serial #");
  Serial.println(sht3xd.readSerialNumber());
  
  delay(10000);

  // Make it slow so its easy to read!
  sim800lSerial->begin(115200, SERIAL_8N1, SIM800L_TX, SIM800L_RX);
  if (!sim800l.begin(*sim800lSerial)) {
    Serial.println(F("Couldn't find GSM SIM800L"));
    while (1);
  }
  Serial.println(F("GSM SIM800L is OK"));

  char imei[16] = {0}; // MUST use a 16 character buffer for IMEI!
  uint8_t imeiLen = sim800l.getIMEI(imei);
  if (imeiLen > 0) {
    Serial.print("SIM card IMEI: "); Serial.println(imei);
  }

  // Set up the FONA to send a +CMTI notification
  // when an SMS is received
  sim800lSerial->print("AT+CNMI=2,1\r\n");

  Serial.println("GSM SIM800L Ready!");
  M5.Lcd.fillRect(0, 150, 320, 20, BLACK);
  M5.Lcd.setTextColor(GREEN);
  M5.Lcd.setCursor(0, 150);
  M5.Lcd.print("GSM SIM800L Ready!");

  if (sht3xd.periodicStart(SHT3XD_REPEATABILITY_HIGH, SHT3XD_FREQUENCY_10HZ) != SHT3XD_NO_ERROR) {
    Serial.println("[ERROR] Cannot start periodic mode");
  }

  playReadyMelody();
}

long prevMillis = 0;
int interval = 1000;
char sim800lNotificationBuffer[64];          //for notifications from the FONA
char smsBuffer[250];
boolean clearStatus = false;
int count = 0;
String dataText = "";

void loop()
{
  if (millis() - prevMillis > interval) {
    prevMillis = millis();
    
    printResult("Periodic Mode", sht3xd.periodicFetchData());

    if (clearStatus) {
      count++;
      if (count == 5) {
        count = 0;
        clearStatus = false;

        M5.Lcd.fillRect(0, 150, 320, 20, BLACK);
        M5.Lcd.setTextColor(YELLOW);
        M5.Lcd.setCursor(0, 150);
        M5.Lcd.print("---");

        M5.Lcd.fillRect(0, 200, 320, 40, BLACK);
        M5.Lcd.setTextColor(YELLOW);
        M5.Lcd.setCursor(0, 200);
        M5.Lcd.print("---");
      }
    }
  }
  
  if (digitalRead(BUTTONA) == LOW) {
    
  }
  if (digitalRead(BUTTONB) == LOW) {
    
  }
  if (digitalRead(BUTTONC) == LOW) {
    
  }
  
  char* bufPtr = sim800lNotificationBuffer;    //handy buffer pointer

  if (sim800l.available()) {
    int slot = 0; // this will be the slot number of the SMS
    int charCount = 0;

    // Read the notification into fonaInBuffer
    do {
      *bufPtr = sim800l.read();
      Serial.write(*bufPtr);
      delay(1);
    } while ((*bufPtr++ != '\n') && (sim800l.available()) && (++charCount < (sizeof(sim800lNotificationBuffer)-1)));
    
    //Add a terminal NULL to the notification string
    *bufPtr = 0;

    //Scan the notification string for an SMS received notification.
    //  If it's an SMS message, we'll get the slot number in 'slot'
    if (1 == sscanf(sim800lNotificationBuffer, "+CMTI: \"SM\",%d", &slot)) {
      Serial.print("slot: "); Serial.println(slot);
      
      char callerIDbuffer[32];  //we'll store the SMS sender number in here
      
      // Retrieve SMS sender address/phone number.
      if (!sim800l.getSMSSender(slot, callerIDbuffer, 31)) {
        Serial.println("Didn't find SMS message in slot!");
      }
      Serial.print(F("FROM: ")); Serial.println(callerIDbuffer);

      M5.Lcd.fillRect(0, 150, 320, 20, BLACK);
      M5.Lcd.setTextColor(YELLOW);
      M5.Lcd.setCursor(0, 150);
      M5.Lcd.print("Receive SMS...");

      // Retrieve SMS value.
      uint16_t smslen;
      // Pass in buffer and max len!
      if (sim800l.readSMS(slot, smsBuffer, 250, &smslen)) {
        smsString = String(smsBuffer);
        Serial.println(smsString);

        M5.Lcd.fillRect(0, 200, 320, 20, BLACK);
        M5.Lcd.setTextColor(YELLOW);
        M5.Lcd.setCursor(0, 200);
        M5.Lcd.print(smsString);
        
        playSMSReceived();
      }

      if (smsString == "DATA") {
        Serial.println("Sending data...");
        delay(100);
        
        char dataTextArray[dataText.length()+1];
        dataText.toCharArray(dataTextArray, dataText.length()+1);
        
        // Send SMS for status
        if (!sim800l.sendSMS(callerIDbuffer, dataTextArray)) {
          Serial.println(F("Failed"));
        } else {
          Serial.println(F("Sent!"));
        }
      }
      else {
        Serial.println("Invalid command!");
        delay(100);
        // Send SMS for status
        if (!sim800l.sendSMS(callerIDbuffer, "Invalid command!")) {
          Serial.println(F("Failed"));
        } else {
          Serial.println(F("Sent!"));
        }
      }

      while (1) {
        if (sim800l.deleteSMS(slot)) {
          Serial.println(F("OK!"));
          break;
        }
        else {
          Serial.print(F("Couldn't delete SMS in slot ")); Serial.println(slot);
          sim800l.print(F("AT+CMGD=?\r\n"));
        }
      }

      clearStatus = true;
    }
  }
}

const int FREQUENCY = 2000;
const int CHANNEL = 0;
const int RESOLUTION = 8;
void playTone(int *melody, int *melodyDur, int notesLength)
{
  for (int i = 0; i < notesLength; i++) {
    ledcAttachPin(SPEAKER, CHANNEL);
    int noteDuration = 1000 / melodyDur[i];
    ledcWriteTone(CHANNEL, melody[i]);
    int pauseBetweenNotes = noteDuration * 1.30;
    delay(pauseBetweenNotes);
    ledcDetachPin(SPEAKER);
    ledcWrite(CHANNEL, 0);
  }
}

void printResult(String text, SHT31D result)
{
  if (result.error == SHT3XD_NO_ERROR) {
    Serial.println(text);

    dataText = "";
    dataText = "Temperature = ";
    dataText += result.t;
    dataText += "C\n";
    dataText += "Humidity = ";
    dataText += result.rh;
    dataText += "%";
    Serial.println(dataText);

    M5.Lcd.fillRect(0, 50, 320, 20, BLACK);
    M5.Lcd.setTextColor(YELLOW);
    M5.Lcd.setCursor(0, 50);
    M5.Lcd.print(result.t);
    
    M5.Lcd.fillRect(0, 100, 320, 20, BLACK);
    M5.Lcd.setTextColor(YELLOW);
    M5.Lcd.setCursor(0, 100);
    M5.Lcd.print(result.rh);
  }
  else {
    Serial.print(text);
    Serial.print(": [ERROR] Code #");
    Serial.println(result.error);
  }
}