I cannot setup my bluetooth module

Projects Networking, Protocols, and Devices
1

I am using Tinysine bluetooth 4.0 ble & edr module.
( this thing Serial Bluetooth 4.0 BLE Module - iBeacon )
I have connected it correctly to my arduino uno (vcc to resistor to 5V, gnd to gng, txd to rx and rxd to tx), i also have connected pin 8 to resistor to diode to gnd. I ran these two programs:

// the first one
#include <SoftwareSerial.h>
SoftwareSerial BT(0, 1);
char cmd;
void setup() {
  pinMode(8, OUTPUT);
  BT.begin(9600);
}
void loop() {
if (BT.available()>0)
  {
    cmd=(BT.read());
    if (cmd=='1')
    {
      digitalWrite(8, HIGH);
      BT.println(" LED on");
    }
    if (cmd=='0')
    {
      digitalWrite(8, LOW);
      BT.println(" LED off");
    }
  }
}

// the second one
char input=0;                
void setup() 
{
  Serial.begin(9600);
  pinMode(8, OUTPUT);
}
void loop()
{
  if(Serial.available() > 0)  
  {
    input = Serial.read();
    if(input == '1') 
      digitalWrite(8, HIGH); 
    else if(input == '0')
      digitalWrite(8, LOW);
  }                            
}

I powered the arduino uno with 7.5 voltage battery deck and connected with the bluetooth module using the app "Serial Bluetooth Terminal". Whatever symbols I send to the module, the only effect I see is the flashing of the "TX" light on the arduino uno.
The diode doesn't light up. What am I doing wrong?

2

That resistor can't be right. Please post a wiring diagram.

Most likely, I/O is 3.3V and if so, you need logic level shifters to use with a 5V Uno.

3

Your second code with serial input will work correctly if you have the led polarity and resistor value correct.

How have you identified the positive leg, and what resistor value are you using?

You should be able to light it up with a 5v and ground connection and no code.

Get the led working first, the get it working with serial input, and then move to the bluetooth.

4

No you haven't. You have connected Bluetooth to hardware serial pins 0,1 using software serial, which is a certain path to disaster.

Also you appear to be using software for "classic" Bluetooth HC-0x rather than that specifically for BLE. This usually leads to grief, but not always. It IS quite OK to have Bluetooth on pins 0,1 but you then dispense with software serial and must have Bluetooth disconnected while you upload the programme.

If you need to use software serial on a Uno, you can use any of the pins you know you won't need, even the analogue ones.

You will probably find what you need for BLE on the Martyn Currey website.

If you are on Android, use the Kai Morisch terminal app.

5

Can you explain what happens with the hardware serial pins connecting using software serial? I have no clue about this, I just looked up in the internet and that's what i got as a response.

6

Incoherent.

Now think about it, why would you use software serial there when those pins are already set up for hardware serial? Not only is that a seriously dumb idea, it doesn't work either. A technical explanation is irrelevant, just cease and desist immediately.