receive data sent to HM-19 ble module and print to serial

Projects Networking, Protocols, and Devices
1

Hi,
I am new to bluetooth, and there was a question I have:

I wanted to print things hm-19 receive to the Arduino Serial

Setup:

HM-19 ---> Arduino UNO
VCC ---> 5v
GND ---> GND
Tx ---> 8
Rx ---> 9

The software I used to send to HM-19 is LightBlue

when I use the following code, it won't work:

#include <Arduino.h>
#include <SoftwareSerial.h>

SoftwareSerial ble(8, 9);

void setup()
{
    Serial.begin(9600);
    ble.begin(9600);
}

void loop()
{
    if (ble.available() > 0)
    {
        Serial.write(ble.read());
    }

}

it prints:

⸮

If I change the "Serial.write(ble.read());" to "Serial.println(ble.read));", it prints a int.

**But it works when I use this code: **

#include <Arduino.h>
#include <SoftwareSerial.h>

SoftwareSerial ble(8, 9);
char recChar;

void setup()
{
    Serial.begin(9600);
    ble.begin(9600);
}

void loop()
{
    if (ble.available() > 0)
    {
        recChar = ble.read();
        Serial.println(recChar);
    }

}

In this case, I created a char variable 'recChar', and it works.

Can someone help me explain why that happens.

Thanks

2

Serial.write sends the raw data, the serial.print converts numbers to base 10 and characters to ASCII.

3

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