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    Help needed: Arduino Wireless Notice Board project

    Arduino
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    • S
      SAFVAN @SAFVAN last edited by

      @kowshik1729 display is 16×32 P10 LED display.
      RX and TX connected pin 3&2.
      P10 connected as https://circuitdigest.com/microcontroller-projects/digital-notice-board-using-p10-led-matrix-display-and-arduino

      1 Reply Last reply Reply Quote 0
      • salmanfaris
        salmanfaris @rafitc99 last edited by salmanfaris

        Hi @rafitc99, You can convert the string to char array using toCharArray() it will Copies the String’s characters to the supplied buffer.

        • Syntax
        myString.toCharArray(buf, len)
        
        • Parameters
          myString: a variable of type String.
          buf: the buffer to copy the characters into. Allowed data types: array of char.
          len: the size of the buffer. Allowed data types: unsigned int.

        more : https://www.arduino.cc/reference/en/language/variables/data-types/string/functions/tochararray/ , https://www.arduino.cc/en/Tutorial/BuiltInExamples#strings

        also @SAFVAN is using const char* to hold message array You cannot change the contents of the location(s) this pointer points to.

        rafitc99 1 Reply Last reply Reply Quote 0
        • rafitc99
          rafitc99 @salmanfaris last edited by

          @salmanfaris Rewrite all code and uploaded. But SMS is not displaying correctly in LED Board, .. I'm attaching code and display output. take a look ,

          #include <SoftwareSerial.h>
          #include <SPI.h>
          #include <DMD.h>
          #include <TimerOne.h>
          #include "SystemFont5x7.h"
          #include "Arial_black_16.h"
          
          #define ROW 1
          #define COLUMN 1
          #define FONT Arial_Black_16
          
          DMD led_module(ROW, COLUMN);
          
          String st; 
          const char *msg;
          unsigned int LengMsg;
          SoftwareSerial mySerial(3, 2);
          
          void scan_module(){
            led_module.scanDisplayBySPI();
          }
          
          void setup() {
            Timer1.initialize(2000);
            Timer1.attachInterrupt(scan_module);
            led_module.clearScreen( true );
            
            Serial.begin(4800);
            mySerial.begin(4800);
            Serial.println("Starting..."); 
            delay(1000);
            mySerial.println("AT");
            pollSms();
            mySerial.println("AT+CMGF=1"); 
            pollSms();
            mySerial.println("AT+CNMI=1,2,0,0,0");
            pollSms();
          }
          
          void loop(){
            pollSms();
            delay(500);
          
            //Start print in led matrix 
            led_module.selectFont(FONT);
            led_module.drawMarquee(msg,LengMsg, (32 * ROW), 0);
            long start = millis();
            long timming = start;
            boolean flag = false;
            while (!flag){
              if((timming + 20) < millis()){
                  flag = led_module.stepMarquee(-1, 0);
                  timming = millis();
                }
              }
            }
          
          void pollSms(){
            delay(500);
            while (Serial.available()) {
              mySerial.write(Serial.read());
              //String st = String(Serial.read());
              //Serial.println(st);
            }
            while(mySerial.available()) {
              Serial.write(mySerial.read());
              st = String(mySerial.readString());
              Serial.println(st);
              LengMsg = st.length();
              st.toCharArray(msg,LengMsg);    
            }
            delay(500);
          }
          

          output video : video link

          A 1 Reply Last reply Reply Quote 0
          • salmanfaris
            salmanfaris last edited by

            Can you print the SMS on the serial monitor too? so we can conclude the problem

            rafitc99 1 Reply Last reply Reply Quote 0
            • rafitc99
              rafitc99 @salmanfaris last edited by

              @salmanfaris in serial monitor getting normal text. No problem in there.

              salmanfaris 1 Reply Last reply Reply Quote 0
              • salmanfaris
                salmanfaris @rafitc99 last edited by

                @rafitc99 Okay, it might be sending char from SMS buffer to LED panel. let me check, I'll get back to you.

                1 Reply Last reply Reply Quote 0
                • A
                  arunksoman @rafitc99 last edited by

                  @rafitc99 Please answer my question...

                  1. Why did u declared message as const? Const indicates you are not going to change that variable any more.

                  Try to use c_str() instead to_charArray()

                  Reference

                  1 Reply Last reply Reply Quote 0
                  • salmanfaris
                    salmanfaris last edited by

                    @rafitc99 , @SAFVAN did you tried the @arunksoman suggestion?

                    1 Reply Last reply Reply Quote 0
                    • S
                      SAFVAN last edited by

                      Now message is displaying with mobile number, date, time.
                      I want filter the actual message only.

                      salmanfaris 1 Reply Last reply Reply Quote 0
                      • salmanfaris
                        salmanfaris @SAFVAN last edited by

                        @SAFVAN what was the solution with the previous problem?

                        rafitc99 1 Reply Last reply Reply Quote 0
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                        • @codelery Awesome. That's great news. Kudos to @rafitc99 . 🙌

                          @codelery Please keep us updated about your project, looking forward to seeing it in action 🤩

                          • read more
                        • C

                          @rafitc99 I changed the buffer and that solved the problem. Thanks a lot for coming to my rescue.

                          • read more
                        • C

                          @salmanfaris I did change the buffer size and everything is working perfectly. Thanks coming to my rescue.

                          • read more
                        • @codelery said in Help needed: Arduino Wireless Notice Board project:

                          I am using the hardware serial (pin 0 and 1 on Arduino Uno)

                          As @rafitc99 mentioned, you need to expand the Serila buffer, in the hardware serial also the Arduino board package implements a 64-byte ring buffer for send and receive on the hardware serial messages. So you need to change that to 256 as per your message length.

                          • read more
                        • C

                          @rafitc99 The thing is that I am not using the SoftwareSerial library in receiving the message from the first microcontroller. I am using the hardware serial (pin 0 and 1 on Arduino Uno)

                          • read more
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