grrigore:
How do I have to connect the module to an Arduino Mega 2560?
grrigore:
Connections:
Bluetooth EN --> 3.3V
Bluetooth RX --> Arduino RX (pin0)
Bluetooth TX --> Arduino TX (pin1)
Bluetooth VCC --> 5V
Bluetooth GND --> GND
Why do you parallel-connect the BT module to the USB<>Serial pins, while you have three unused serial pins available.
Use serial1 (pin 18,19), or any of the other hardware serial pins.
EN can be left unconnected.
The RX pin needs to be level-shifted with a voltage divider (1k:2k2).
Leo..