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.
Remember to use 3.3V for serial TTL.
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HC-05 Wireless Bluetooth Module (with AT Button)