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Simple Bluetooth CAT Interface

 In this article, I will try to thoroughly explain the Bluetooth Cat interface that we will use to connect between Radio and Android, as well as Radio with PC/Laptop.

HC-05 Module 100% Compatible with: YAESU FT-857/D, FT-817/ND, FT-897, FT-100D , BITX101

It’s very easy to connect and use. It doesn’t required knowledge other than how to connect a regular Bluetooth device.

Just plug my HC-05 module into your TRX and run the application on your phone. Connect via Bluetooth. Done.

– Change Bands

– Tune Frequency– Transmit

What we need to prepare include:

  • Module Bluetooth HC-05 1pcs 
  • Module Usb to TTL

Module Bluetooth HC-05 Setup

The HC-05 Bluetooth Module is a Bluetooth module that has a UART interface. Or what we usually know as Serial communication. So to access the HC-05 Bluetooth module, just use the RX and TX pins.

Likewise, radios that already support the Cat system have RX and TX pins to be able to sync with applications on a PC/Laptop. But first we need to set up the HC-05 Module so it can be used. Here's how:
✓ First connect the HC-05 Bluetooth Module to the Usb to TTL Module as shown below
✓ Connect to the USB to TTL Module PC at the same time by pressing the button on the HC-05 Bluetooth Module. That way, we can enter AT-Mode. The LED on the HC-05 Bluetooth Module will flash approximately every 2 seconds indicating that the method above is correct.

✓ Now Move to the PC Screen and run the Arduino IDE Application select Board "Arduino Due Programming Port" and select the appropriate Com.
✓ Then open Serial Monitor by selecting the Tools>Serial Monitor menu or by pressing Ctrl+Shift+M
✓ Baudrate setting on Serial Monitor 38400 and select closing character Both NL & CR
✓ Type AT and press enter. If the previous steps have been done correctly, the message OK!

✓ In the same way as in the steps above, we can set the Bluetooth mode as a client/slave, by typing AT+ROLE=0 then press Enter.

✓ For Device Name settings, type AT+NAME=XXXX (device name) then press Enter.

✓ For password settings, type AT+PSWD=XXXX (the device password) then press Enter.

✓ For Baudrate settings, type AT+UART=9600,0,0 (2400, 4800, 9600, 115200, etc.) then press Enter.

✓ To find out the current setting for the HC-05, simply type the command and add a '?' sign. AT+PSWD example? Then press Enter.

✓ After making the settings, restart the HC-05 module by removing the VCC source from the HC-05 module, then plug it in again.

HC-05 Bluetooth Module can be used.

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