/********* Pleasedontcode.com ********** Pleasedontcode thanks you for automatic code generation! Enjoy your code! - Terms and Conditions: You have a non-exclusive, revocable, worldwide, royalty-free license for personal and commercial use. Attribution is optional; modifications are allowed, but you're responsible for code maintenance. We're not liable for any loss or damage. For full terms, please visit pleasedontcode.com/termsandconditions. - Project: "RTC Synchronization" - Source Code compiled for: Arduino Nano ESP32 - Source Code created on: 2024-06-13 22:48:18 ********* Pleasedontcode.com **********/ /****** SYSTEM REQUIREMENTS *****/ /****** SYSTEM REQUIREMENT 1 *****/ /* initialize gsm */ /****** SYSTEM REQUIREMENT 2 *****/ /* align one time per day the clock from gsm to RTC */ /****** END SYSTEM REQUIREMENTS *****/ /****** DEFINITION OF LIBRARIES *****/ #include //https://github.com/plerup/espsoftwareserial #include #include //https://github.com/vittorioexp/Sim800L-Arduino-Library-revised #include //https://github.com/NorthernWidget/DS3231 /****** FUNCTION PROTOTYPES *****/ void setup(void); void loop(void); void updateOutputs(void); void inputDateFromSerial(void); void syncClockFromGSM(void); /***** DEFINITION OF DIGITAL INPUT PINS *****/ const uint8_t gsm_SIM800L_RING_PIN_D3 = 3; /***** DEFINITION OF DIGITAL OUTPUT PINS *****/ const uint8_t gsm_SIM800L_RST_PIN_D2 = 2; const uint8_t gsm_SIM800L_DTR_PIN_D4 = 4; /***** DEFINITION OF Software Serial *****/ const uint8_t gsm_SIM800L_Serial_PIN_SERIAL_TX_A0 = A0; const uint8_t gsm_SIM800L_Serial_PIN_SERIAL_RX_A1 = A1; EspSoftwareSerial::UART gsm_SIM800L_Serial(gsm_SIM800L_Serial_PIN_SERIAL_RX_A1, gsm_SIM800L_Serial_PIN_SERIAL_TX_A0); // Initialize SoftwareSerial /***** DEFINITION OF I2C PINS *****/ const uint8_t clock_DS3231_I2C_PIN_SDA_A4 = A4; const uint8_t clock_DS3231_I2C_PIN_SCL_A5 = A5; const uint8_t clock_DS3231_I2C_SLAVE_ADDRESS = 104; /***** DEFINITION OF OUTPUT RAW VARIABLES *****/ /***** used to store raw data *****/ bool gsm_SIM800L_RST_PIN_D2_rawData = 0; bool gsm_SIM800L_DTR_PIN_D4_rawData = 0; /***** DEFINITION OF OUTPUT PHYSICAL VARIABLES *****/ /***** used to store data after characteristic curve transformation *****/ float gsm_SIM800L_RST_PIN_D2_phyData = 0.0; float gsm_SIM800L_DTR_PIN_D4_phyData = 0.0; /****** DEFINITION OF LIBRARIES CLASS INSTANCES*****/ Sim800L GSM(gsm_SIM800L_Serial_PIN_SERIAL_RX_A1, gsm_SIM800L_Serial_PIN_SERIAL_TX_A0, gsm_SIM800L_RST_PIN_D2); // Initialize Sim800L object DS3231 myRTC; // Initialize DS3231 object // Variables for DS3231 int year, month, date, dow, hour, minute, second; // Changed to int bool century = false, h12Flag, pmFlag; unsigned long lastSyncTime = 0; // Variable to store the last sync time const unsigned long syncInterval = 86400000; // 24 hours in milliseconds void setup(void) { // put your setup code here, to run once: pinMode(gsm_SIM800L_RING_PIN_D3, INPUT_PULLUP); pinMode(gsm_SIM800L_RST_PIN_D2, OUTPUT); pinMode(gsm_SIM800L_DTR_PIN_D4, OUTPUT); gsm_SIM800L_Serial.begin(9600, SWSERIAL_8N1, gsm_SIM800L_Serial_PIN_SERIAL_RX_A1, gsm_SIM800L_Serial_PIN_SERIAL_TX_A0, false); /* initialize gsm */ GSM.begin(4800); // Initialize GSM module GSM.updateRtc(+1); // Update RTC with UTC offset // Initialize I2C communication for DS3231 Wire.begin(clock_DS3231_I2C_PIN_SDA_A4, clock_DS3231_I2C_PIN_SCL_A5); // Start the serial port for debugging Serial.begin(57600); // Request the time correction on the Serial delay(4000); Serial.println("Format YYMMDDwhhmmssx"); Serial.println("Where YY = Year (ex. 20 for 2020)"); Serial.println(" MM = Month (ex. 04 for April)"); Serial.println(" DD = Day of month (ex. 09 for 9th)"); Serial.println(" w = Day of week from 1 to 7, 1 = Sunday (ex. 5 for Thursday)"); Serial.println(" hh = hours in 24h format (ex. 09 for 9AM or 21 for 9PM)"); Serial.println(" mm = minutes (ex. 02)"); Serial.println(" ss = seconds (ex. 42)"); Serial.println("Example for input : 2004095090242x"); Serial.println("-----------------------------------------------------------------------------"); Serial.println("Please enter the current time to set on DS3231 ended by 'x':"); } void loop(void) { // put your main code here, to run repeatedly: updateOutputs(); // Refresh output data // If something is coming in on the serial line, it's // a time correction so set the clock accordingly. if (Serial.available()) { inputDateFromSerial(); myRTC.setClockMode(false); // set to 24h myRTC.setYear(year); myRTC.setMonth(month); myRTC.setDate(date); myRTC.setDoW(dow); myRTC.setHour(hour); myRTC.setMinute(minute); myRTC.setSecond(second); // Give time at next five seconds for (uint8_t i = 0; i < 5; i++){ delay(1000); Serial.print(myRTC.getYear(), DEC); Serial.print("-"); Serial.print(myRTC.getMonth(century), DEC); Serial.print("-"); Serial.print(myRTC.getDate(), DEC); Serial.print(" "); Serial.print(myRTC.getHour(h12Flag, pmFlag), DEC); //24-hr Serial.print(":"); Serial.print(myRTC.getMinute(), DEC); Serial.print(":"); Serial.println(myRTC.getSecond(), DEC); } // Notify that we are ready for the next input Serial.println("Please enter the current time to set on DS3231 ended by 'x':"); } /* align one time per day the clock from gsm to RTC */ if (millis() - lastSyncTime >= syncInterval) { syncClockFromGSM(); lastSyncTime = millis(); } delay(1000); } void updateOutputs() { digitalWrite(gsm_SIM800L_RST_PIN_D2, gsm_SIM800L_RST_PIN_D2_rawData); digitalWrite(gsm_SIM800L_DTR_PIN_D4, gsm_SIM800L_DTR_PIN_D4_rawData); } void inputDateFromSerial() { // Call this if you notice something coming in on // the serial port. The stuff coming in should be in // the order YYMMDDwHHMMSS, with an 'x' at the end. boolean isStrComplete = false; char inputChar; byte temp1, temp2; char inputStr[20]; uint8_t currentPos = 0; while (!isStrComplete) { if (Serial.available()) { inputChar = Serial.read(); inputStr[currentPos] = inputChar; currentPos += 1; // Check if string complete (end with "x") if (inputChar == 'x') { isStrComplete = true; } } } Serial.println(inputStr); // Find the end of char "x" int posX = -1; for(uint8_t i = 0; i < 20; i++) { if(inputStr[i] == 'x') { posX = i; break; } } // Consider 0 character in ASCII uint8_t zeroAscii = '0'; // Read Year first temp1 = (byte)inputStr[posX - 13] - zeroAscii; temp2 = (byte)inputStr[posX - 12] - zeroAscii; year = temp1 * 10 + temp2; // now month temp1 = (byte)inputStr[posX - 11] - zeroAscii; temp2 = (byte)inputStr[posX - 10] - zeroAscii; month = temp1 * 10 + temp2; // now date temp1 = (byte)inputStr[posX - 9] - zeroAscii; temp2 = (byte)inputStr[posX - 8] - zeroAscii; date = temp1 * 10 + temp2; // now Day of Week dow = (byte)inputStr[posX - 7] - zeroAscii; // now Hour temp1 = (byte)inputStr[posX - 6] - zeroAscii; temp2 = (byte)inputStr[posX - 5] - zeroAscii; hour = temp1 * 10 + temp2; // now Minute temp1 = (byte)inputStr[posX - 4] - zeroAscii; temp2 = (byte)inputStr[posX - 3] - zeroAscii; minute = temp1 * 10 + temp2; // now Second temp1 = (byte)inputStr[posX - 2] - zeroAscii; temp2 = (byte)inputStr[posX - 1] - zeroAscii; second = temp1 * 10 + temp2; } void syncClockFromGSM() { // Get the current time from the GSM module GSM.RTCtime(&date, &month, &year, &hour, &minute, &second); // Set the DS3231 RTC with the GSM time myRTC.setClockMode(false); // set to 24h myRTC.setYear(year); myRTC.setMonth(month); myRTC.setDate(date); myRTC.setDoW(dow); myRTC.setHour(hour); myRTC.setMinute(minute); myRTC.setSecond(second); Serial.println("RTC synchronized with GSM time."); }