I built a standalone arduino on a breadboard using atmega328p chip. And then I connected the HC-05 Bluetooth module as usual(TX to MCU RX, RX to MCU TX via voltage divider, 5V to 5V and GND to GND). But when I connect the circuit to the power source(5V and GND from Arduino board with no MCU on it), the HC-05 does not turn on(usually its LED will blink). Is there anything I need to do with HC-05 so it will works directly with atmega328p?