Bluetooth HC-05 apply

The Instructable post is missing a 10 uF capacitor between the DTR and reset pin. It's required for auto uploading the sketch. But the serial communication should always work.

In your video, the serial is receiving commands but not recognizing the character. Probably related to baud rate or frequency. Have you set up the HC-05 module with "at" commands, as described in the Instructable post?

Could you try the Arduino example codes ASCII Table to check whether the serial is working? It should print out a table in the serial monitor.

Thanks, work properly!!! I found some additional info about HC-05 http://www.buildlog.net/blog/2017/10/using-the-hc-05-bluetooth-module/ note: 1) to know the default variable add "?" Ex: AT+NAME? otherwise you will get ERROR[0] 2) lowercase "at" not worked for me 3) AT+VERSION was v4 4) AT+POLAR return ERROR (but without this setting it work normal. In this link you can get a bit info about this settings (http://www.buildlog.net/blog/2017/10/using-the-hc-05-bluetooth-module/) 5) after AT+ORGL it restarted and you need to reconnect and change HC-05 mode 6) to change MODE need plug on power, than press reset button and keep hold it, then plug on power, LED would blink 1 times to 2 second

Thanks for help!!!😎

yes