Cannot connect via hc-05 bluetooth module

[Srallie]

hello,

i have the mega x5 grbl firmware and connect them to a hc-05 bluetooth module. By other programs like laser grbl/ lightburn i will connect directly,but grbl plotter says:

• COM5 not available

how to solve?

[svenhb]

Perhaps COM5 is still occupied by another application you tried before?

[svenhb]

Perhaps the bluetooth port has an other number? Did you try to "Scan Ports" and find the correct port?

[Srallie]

Hello,

Thanks for fast response. When i plug it in with cable, com 3 works perfect. When i turn on Bluetooth on com 5, then it didnt work.

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From: Sven @.> Sent: Monday, February 19, 2024 12:58:56 PM To: svenhb/GRBL-Plotter @.> Cc: Srallie @.>; Author @.> Subject: Re: [svenhb/GRBL-Plotter] Cannot connect via hc-05 bluetooth module (Issue #378)

Perhaps the bluetooth port has an other number? Did you try to "Scan Ports" and find the correct port? image.png (view on web)https://github.com/svenhb/GRBL-Plotter/assets/19973251/6eebf48c-196d-4836-aed5-169b19a6fa56 image.png (view on web)https://github.com/svenhb/GRBL-Plotter/assets/19973251/6a317987-2041-4668-a66f-5e177e0d554e

— Reply to this email directly, view it on GitHubhttps://github.com/svenhb/GRBL-Plotter/issues/378#issuecomment-1952299899, or unsubscribehttps://github.com/notifications/unsubscribe-auth/A46U5I3DIMDOQFZPGUKDSMLYUM5ABAVCNFSM6AAAAABDOMEUL6VHI2DSMVQWIX3LMV43OSLTON2WKQ3PNVWWK3TUHMYTSNJSGI4TSOBZHE. You are receiving this because you authored the thread.Message ID: @.***>

[svenhb]

I tried with my bare Mega 2560 (x5 grbl firmware) and it works... I followed this video: https://youtu.be/TyoPwvf1lCs?si=yFRIm1Z8mgEXd5Uo to use an Arduino Uno for serial connection, to setup the HC-05 module (baud rate must be set for use with grbl). in bullet points:

• connect the HC-05 to Arduino Gnd, 5V, TXD, RXD (I used voltage divider for HC-05 RXD-input)

• Before power on, tie HC-05 "EN" to gnd, press HC-05 button.

• After power on, release button and tie "EN" to Vcc

• Open Arduino IDE

• Select COM-port of Arduino

• Open Serial Monitor

• Set speed to 38400 baud, to communicate with HC-05 module

• Send HC-05 commands: AT+UART=115200,0,0 set speed AT+NAME? check shown name AT+PSWD? check passwort

• now the HC-05 module can be connected to the grbl controller in the same way

• NOTE: powering the grbl-controller via PC-USB will cause problems, because RXD/TXD of PC-USB are connected to RXD/TXD of HC-05 module = short circuit of the data lines!

[Srallie]

Ok,strange..I will try again this week.👍

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From: Sven @.> Sent: Thursday, February 22, 2024 7:19:20 PM To: svenhb/GRBL-Plotter @.> Cc: Srallie @.>; Author @.> Subject: Re: [svenhb/GRBL-Plotter] Cannot connect via hc-05 bluetooth module (Issue #378)

I tried with my bare Mega 2560 (x5 grbl firmware) and it works... image.png (view on web)https://github.com/svenhb/GRBL-Plotter/assets/19973251/86e2111d-4d40-4577-97e6-01efe978df44

— Reply to this email directly, view it on GitHubhttps://github.com/svenhb/GRBL-Plotter/issues/378#issuecomment-1960010093, or unsubscribehttps://github.com/notifications/unsubscribe-auth/A46U5I76HIIBV4RPML6BXFTYU6D2RAVCNFSM6AAAAABDOMEUL6VHI2DSMVQWIX3LMV43OSLTON2WKQ3PNVWWK3TUHMYTSNRQGAYTAMBZGM. You are receiving this because you authored the thread.Message ID: @.***>

[svenhb]

Perhaps thats the problem? NOTE: powering the grbl-controller via PC-USB will cause problems, because RXD/TXD of PC-USB are connected to RXD/TXD of HC-05 module = short circuit of the data lines!