How to connect HC05 module with arduino?

[zenmonkey]

I have a bluetooth HC05 module that I would like to connect to my Arduino. The back of the module states that the input into the RXD pin needs to be levelled to 3.3 volts. I understand this can be done by creating a voltage divider circuit. I have the Arduino Student Kit, so I have 5x 260 Ohm, 5x 220 Ohm, 1x 1000 Ohm, and 1 10k Ohm resistor.

Could someone explain to me how to wire this up so I can access the bluetooth with the serial monitor?

[bluejets]

@zenmonkey

The back of the module states that the input into the RXD pin needs to be levelled to 3.3 volts. I understand this can be done by creating a voltage divider circuit.

Voltage dividers are fine for signals but........when it comes to powering devices, use a regulator or voltage converter as the divider will not work over a range of supply demand currents.

[groundFungus]

@zenmonkey

Could someone explain to me how to wire this up so I can access the bluetooth with the serial monitor?

Here is a way using what you have.

Lots of information from Martyn Currie on the HC05 Bluetooth modules. >> HC-05 – Martyn Currey

I suggest using a spare hardware serial port if available or a software serial port for the HC05, at least for development. Save the main hardware serial port for program upload, program debug and viewing program output.

If you will be in the hobby for long, buy a cheap kit of resistors. It wont take long till you find the values most used and stock up on those.

[Nick_Pyner]

@zenmonkey

that the input into the RXD pin needs to be levelled to 3.3 volts. I understand this can be done by creating a voltage divider circuit.

You understand correctly, and you are dealing with signals, so you can safely ignore reply#2. The normal practice is a 1k/2k divider, as you will see on the Martyn Currey website.