Bluetooth text file transfer from mobile phone to PIC - rookie's question


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  1. #1
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    Default Bluetooth text file transfer from mobile phone to PIC - rookie's question

    Hi All,

    Is is possible to send a text file from a smartphone's bluetooth standard to a PIC?

    I imagine there is a complex file transfert protocol to make sure things are send and received properly.

    Nevertheless, there might some "module" out there that could do this for me.

    Is it the case?
    Roger

  2. #2
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    Default Re: Bluetooth text file transfet from mobile phone to PIC - rookie's question

    You could look at a module called the HC05. It will pair with your bluetooth phone and can talk on 5V UART with the PIC.

  3. #3
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    Default Bluetooth text file transfet from mobile phone to PIC - rookie's question

    Thanks Jerson.

    I'll grab some of these modules and try
    Roger

  4. #4
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    Default Re: Bluetooth text file transfet from mobile phone to PIC - rookie's question

    wifi is the easy way , just add an esp module or a socket for one
    Warning I'm not a teacher

  5. #5
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    Default Bluetooth text file transfet from mobile phone to PIC - rookie's question

    Like i.e. this one?

    Name:  ESP8266_module.png
Views: 237
Size:  105.2 KB


    Okay, and then, is there any particular protocol to involve or what is the idea to transmit data from à common smartphone to a PIC?
    Roger

  6. #6
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    Default Re: Bluetooth text file transfet from mobile phone to PIC - rookie's question

    esp01 modules tend to have smallish flash chips installed something with a 4meg or bigger flash is better. [wemos d1 mini or d1 mini pro]
    i set the esp up as a simple web server. user can upload/download files from the server via a html script using any sort of browser.
    the esp can then send or fetch the file data from the pic via a ttl serial connection or spi or i2c or whatever floats your boat at whatever speed you like
    whenever you like. no special software is needed at all in your browser for most common file types to upload or download successfully

    https://www.picbasic.co.uk/forum/sho...776#post154776
    Warning I'm not a teacher

  7. #7

    Default Re: Bluetooth text file transfet from mobile phone to PIC - rookie's question

    Okay, and then, is there any particular protocol to involve or what is the idea to transmit data
    How big a file or text to send/receive ?

  8. #8
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    Default Bluetooth text file transfet from mobile phone to PIC - rookie's question

    It would be a config file containing data like:

    001:123456789
    002:234567890
    ...
    ...
    ...
    254:456789012
    255:567890123

    So this makes a count of about 2'300 characters in total.
    Roger

  9. #9
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    Default Re: Bluetooth text file transfer from mobile phone to PIC - rookie's question

    After many hours of trying and trying again, none of my four HC05 modules are willing to accept the "Master" Role. I assume this is why I couldn't establish a serial link between them

    This is the most common example of HC05 modules configuration:

    ' Slave Configuration:
    ' AT+RMAAD (To clear any paired devices)
    ' AT+ROLE=0 (To set it as slave)
    ' AT+ADDR (To get the address of this HC-05, remember to jot the address down as it will be used during master configuration)
    ' AT+UART=9600,0,0 (To fix the baud rate at 9600)

    ' Master Configuration:
    ' AT+RMAAD (To clear any paired devices)
    ' AT+ROLE=1 (To set it as master)
    ' AT+CMODE=0 (To connect the module to the specified Bluetooth address and this Bluetooth address can be specified by the
    ' binding command)
    ' AT+BIND=xxxx,xx,xxxxxx (Now, type AT+BIND=98d3,34,906554 obviously with your respective address to the slave. Note the
    ' commas instead of colons given by the slave module)
    ' AT+UART=9600,0,0 (To fix the baud rate at 9600)


    Every time I send the command AT+ROLE=1, the answer is OK but if I check with AT+ROLE, the answer is always +ROLE:0.

    I even found some information suggesting to have the MASTER role physically set with a jumper 3.3V <> Pin 28 or even 3.3V <> Pin 34, which I tried.
    https://www.martyncurrey.com/hc-05-f...-auto-connect/
    https://www.martyncurrey.com/arduino...odule-at-mode/


    But still nothing works...

    Is there a beam in my eye or can possibily all my four modules be malfunctioning? They're new....

    These are my modules:
    Name:  HC05_Front.jpg
Views: 116
Size:  32.6 KB Name:  HC05_Back.jpg
Views: 117
Size:  25.1 KB
    Roger

  10. #10
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    Default Re: Bluetooth text file transfer from mobile phone to PIC - rookie's question

    Firstly, wishing all who read this post a happy and fruitful year ahead.

    I have used these modules. You need to ensure that the interface to the module works @3.3V not 5V. I just re-looked at my C code and see that there is zero initialisation that I have used with the modules. They natively connect akin to a serial UART and you can use a BT serial terminal to read/write to it. I have not used a single AT command in the code, and it works.

  11. #11
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    Default Bluetooth text file transfer from mobile phone to PIC - rookie's question

    I use FTDI USB cables that have 5V power and 3.3v UART levels so it should be okay from this side.

    I finally ordered new and different (looking) HC05 modules.

    Name:  HC05_new.jpg
Views: 92
Size:  31.5 KB

    These ones have two almost equally sized black chips unlike the ones I have on my desk so they might be a little différent.

    So wait and see...
    Roger

  12. #12
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    Default Bluetooth text file transfer from mobile phone to PIC - rookie's question

    Just received the "new" modules and guess what?

    Name:  2024-01-15 17_40_18-AI-Thinker Serial Tool V1.2.3.0    www.ai-thinker.com.jpg
Views: 84
Size:  72.7 KB


    These are the ones I have now.

    Name:  New-modules.jpg
Views: 89
Size:  76.0 KB


    I finally can start my tests
    Roger

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