SERIAL-BT data not showing correct on serial montor

[SRJ]

Hey everyone ,

I am making a project based on serial-bt

but the problem is when I assign serial.read to a variable and print it on the serial
it shows one by one digit every time

I think there is any programming issue

please help!!!

more details are below with code and screenshots

#include "BluetoothSerial.h"

#if !defined(CONFIG_BT_ENABLED) || !defined(CONFIG_BLUEDROID_ENABLED)
#error Bluetooth is not enabled! Please run `make menuconfig` to and enable it
#endif

BluetoothSerial SerialBT;

char tc;

void setup() {

  Serial.begin(9600);
     SerialBT.begin("ESP32test"); //Bluetooth device name
  Serial.println("The device started, now you can pair it with bluetooth!");
 
  }

void loop() {
  if (SerialBT.available()) {

tc = (SerialBT.read());
}

    Serial.print("TC entered  =");
  Serial.println(tc);

  delay(1000);
}

.
.
.
The BELOW image is of the Bluetooth serial (where I enter data.)
.
.

.
.
.

screenshot of SERIAL MONITOR (where I see results)
.
.

.
.
.
.
.
I tried this with many Bluetooth serial monitor

[Perehama]

#include "BluetoothSerial.h"

#if !defined(CONFIG_BT_ENABLED) || !defined(CONFIG_BLUEDROID_ENABLED)
#error Bluetooth is not enabled! Please run `make menuconfig` to and enable it
#endif

BluetoothSerial SerialBT;

char tc;

void setup() {

  Serial.begin(9600);
  SerialBT.begin("ESP32test"); //Bluetooth device name
  Serial.println("The device started, now you can pair it with bluetooth!");

}

void loop() {
  if (SerialBT.available()) {
    tc = (SerialBT.read());
    Serial.print("TC entered  =");
    Serial.println(tc);
  }
}

[Perehama]

#include "BluetoothSerial.h"

#if !defined(CONFIG_BT_ENABLED) || !defined(CONFIG_BLUEDROID_ENABLED)
#error Bluetooth is not enabled! Please run `make menuconfig` to and enable it
#endif

BluetoothSerial SerialBT;

char tc[50];
unsigned char tcIndex;

void setup() {

  Serial.begin(9600);
  SerialBT.begin("ESP32test"); //Bluetooth device name
  Serial.println("The device started, now you can pair it with bluetooth!");

}

void loop() {
  if (SerialBT.available()) {
    while (SerialBT.available() && tcIndex < 50) {
      tc[tcIndex] = (SerialBT.read());
      tcIndex++;
      tc[tcIndex] = '\0';
      delay(2UL);
    }
    tcIndex = 0;
    Serial.print("TC entered  =");
    Serial.println(tc);
  }
}

[SRJ]

Hey Perehama,

thanks for your reply
but the solution also has a problem

It is not deleting the value it saved before...

when I enter a new value it gets after old value

[Perehama]

my bad, there's a bug that tcIndex never gets set to zero...

#include "BluetoothSerial.h"

#if !defined(CONFIG_BT_ENABLED) || !defined(CONFIG_BLUEDROID_ENABLED)
#error Bluetooth is not enabled! Please run `make menuconfig` to and enable it
#endif

BluetoothSerial SerialBT;

char tc[50];
unsigned char tcIndex;

void setup() {

  Serial.begin(9600);
  SerialBT.begin("ESP32test"); //Bluetooth device name
  Serial.println("The device started, now you can pair it with bluetooth!");

}

void loop() {
  if (SerialBT.available()) {
    tcIndex = 0;
    while (SerialBT.available() && tcIndex < 50) {
      tc[tcIndex] = (SerialBT.read());
      tcIndex++;
      tc[tcIndex] = '\0';
      delay(2UL);
    }
    Serial.print("TC entered  =");
    Serial.println(tc);
  }
}

[SRJ]

Nothing is seen on the serial monitor
everything is blank.

[SRJ]

HEY, my work is done using this code example.....

Serial Input Basics - updated

Updated Version Please note that this is a revised version of the advice in this earlier Thread which has become very long. As far as possible I have kept the code examples identical or simplifed them slightly. It should not be necessary to refer to the older Thread, but feel free to do so. Contents The following sections are in this Tutorial Introduction Serial data is slow by Arduino standards Example 1 - Receiving single characters Why code is organized into functions Exampl…

// Example 2 - Receive with an end-marker

const byte numChars = 32;
char receivedChars[numChars];   // an array to store the received data

boolean newData = false;

void setup() {
    Serial.begin(9600);
    Serial.println("<Arduino is ready>");
}

void loop() {
    recvWithEndMarker();
    showNewData();
}

void recvWithEndMarker() {
    static byte ndx = 0;
    char endMarker = '\n';
    char rc;
    
    while (Serial.available() > 0 && newData == false) {
        rc = Serial.read();

        if (rc != endMarker) {
            receivedChars[ndx] = rc;
            ndx++;
            if (ndx >= numChars) {
                ndx = numChars - 1;
            }
        }
        else {
            receivedChars[ndx] = '\0'; // terminate the string
            ndx = 0;
            newData = true;
        }
    }
}

void showNewData() {
    if (newData == true) {
        Serial.print("This just in ... ");
        Serial.println(receivedChars);
        newData = false;
    }
}