Start simple.

1. send serial data from PC. either use Arduino USB port or on real hardware serial port, needs USB to serial adaptor and a terminal software. (see diagram in below web)

2. for starting, no need for header. Just use simple text as defined yourself

3. on Arduino side, read serial input. For example, type letter 'a' on PC will blink LED, 'b' to move servo 30 degree

4. Replace serial communication (like RS-232 or a UART) with Bluetooth. Bluetooth supports many 'profiles', like headset, keyboard, etc.

You need to use the SPP profile. see https://learn.sparkfun.com/tutorials/bluetooth-basics/bluetooth-profiles

Make sure your purchased bluetooth device supports SPP. Some bluetooth device are permanently setup to do one fix action. However, many bluetooth need to be 'programmed' (told what to do) before doing the task via AT command. Set speed, pairing, etc.

https://learn.sparkfun.com/tutorials/using-the-bluesmirf/example-code-using-command-mode

http://www.instructables.com/id/Modify-The-HC-05-Bluetooth-Module-Defaults-Using-A/

Start simple.

1. send serial data from PC. either use Arduino USB port or on real hardware serial port, needs USB to serial adaptor and a terminal software. (see diagram in below web)

2. for starting, no need for header. Just use simple text as defined yourself

3. on Arduino side, read serial input. For example, type letter 'a' on PC will blink LED, 'b' to move servo 30 degree

4. Replace serial communication (like RS-232 or a UART) with Bluetooth. Bluetooth supports many 'profiles', like headset, keyboard, etc. that are not suitable in your case.

See below video. You need to use the SPP profile. see https://learn.sparkfun.com/tutorials/bluetooth-basics/bluetooth-profiles

Make sure your purchased bluetooth device supports SPP. Some bluetooth device are permanently setup to do one fix action. However, many bluetooth need to be 'programmed' (told what to do) before doing the task via AT command. Set speed, pairing, etc.

https://learn.sparkfun.com/tutorials/using-the-bluesmirf/example-code-using-command-mode

http://www.instructables.com/id/Modify-The-HC-05-Bluetooth-Module-Defaults-Using-A/

Start simple.

1. send serial data from PC. either use Arduino USB port or on real hardware serial port, needs USB to serial adaptor and a terminal software. (see diagram in below web)

2. for starting, no need for header. Just use simple text as defined yourself

3. on Arduino side, read serial input. For example, type letter 'a' on PC will blink LED, 'b' to move servo 30 degree

4. Replace serial communication (like RS-232 or a UART) with Bluetooth. Bluetooth supports many 'profiles', like headset, keyboard, etc.

You need to use the SPP profile. see https://learn.sparkfun.com/tutorials/bluetooth-basics/bluetooth-profiles

Make sure your purchased bluetooth device supports SPP

Start simple.

1. send serial data from PC. either use Arduino USB port or on real hardware serial port, needs USB to serial adaptor and a terminal software. (see diagram in below web)

2. for starting, no need for header. Just use simple text as defined yourself

3. on Arduino side, read serial input. For example, type letter 'a' on PC will blink LED, 'b' to move servo 30 degree

4. Replace serial communication (like RS-232 or a UART) with Bluetooth. Bluetooth supports many 'profiles', like headset, keyboard, etc.

You need to use the SPP profile. see https://learn.sparkfun.com/tutorials/bluetooth-basics/bluetooth-profiles

Make sure your purchased bluetooth device supports SPP. Some bluetooth device are permanently setup to do one fix action. However, many bluetooth need to be 'programmed' (told what to do) before doing the task via AT command. Set speed, pairing, etc.

https://learn.sparkfun.com/tutorials/using-the-bluesmirf/example-code-using-command-mode

http://www.instructables.com/id/Modify-The-HC-05-Bluetooth-Module-Defaults-Using-A/