The HC-05 bluetooth module (No AT Button) is a easy to use transceiver. The modems is design to work as a serial (RX/TX) data pipe, and are a grest replacement for serial cables. Any serial stream from 2400 to 115200bps can be passed seamlessly from your computer to your target. The HC-05 can be programmed as a master or a slave device.
We Also Recommend
Adafruit Bluefruit LE SPI Friend - Bluetooth Low Energy (BLE)
Adafruit Bluefruit LE UART Friend - Bluetooth Low Energy (BLE)