Help connecting RN-42 Bluetooth module to ATMEGA328

Wireless & IoT
1

I’m trying to learn how to connect an RN-42 Bluetooth module (http://www.sparkfun.com/products/10253) to an ATMEGA328 chip on a PCB design in Eagle.

I have already connected the VDD and RESET pins to my power lines (3.3V) and the six GND pins to my GND line. But what about the data? Do I only need to connect the four UART lines to my ATMEGA? If so, how? Any other pins that I need to connect?

My goal is to allow people to use their smartphone to connect to my board (a basic RGB LED driver) and control the color of the RGB LED. I’ve written Android apps before and can figure that out in the future, but is this module designed for that kind of use?

2

Take a look at the schematic for the Bluetooth Mate Silver. It uses the RN-42 module.

http://www.sparkfun.com/products/10269

Of course, if your Atmega328p is running at 3.3V, you won’t need any of those level shifters or the regulator, but it will show you which UART pins to connect to.