[chbot] Lazy and Blue tooth

Sun Dec 10 20:57:11 GMT 2023

The most important thing to start with is understanding the difference
between Bluetooth Classic and Bluetooth LE.

For what you are talking about either can be made to work.

The biggest difference between the two is (hand wavey) that:
* BT Classic sets up connections called RFCOMM sockets which provide
multiple serial-port-like connections. These might be just raw RFCOMM
(akaa serial) skates or they can have higher level protocols on top
(eg. networking, OBEX etc),
* BLE is designed more for quick exchanges of relatively small packets
(though there are ways to make a longer term transport on top of
that). The most frequently used protocol is GATT and GAP. These
provide a way of publishing "database records". This is commonly used
for applications such as medical appliances, battery monitoring etc.

I would think that BLE is the "perfect" choice for your application,
but Classic could work.

The chipsets are generally not interchangeable.

One of the handy boards for playing with BLE is the Nordic dongle:
https://www.digikey.co.nz/en/products/detail/nordic-semiconductor-asa/NRF52840-DONGLE/9491124

This board plugs into USB and can be used as a dongle on a PC, as well
as being used stand alone.
Since the microcontroller is built into the radio module, that is all
you need. It has ADCs etc.

On Sun, Dec 10, 2023 at 3:48 PM Robin Gilks <gb7ipd at gmail.com> wrote:
>
> I'd second the esp32 running both the embedded real time bit alongside a web server that your phone can connect to.
>
> I gave a presentation of Mongoose-OS at the club about 4 years ago that would do all that; pretty simple to develop and super easy to integrate to (even 4 years ago there were simple interfaces for temperature sensors etc)
>
>
> On Sun, Dec 10, 2023 at 2:32 PM Daniel Powell <danielvieway at hotmail.com> wrote:
>>
>> While there are thousands of ways about doing the same thing....
>>
>> I'm more familiar with the ESP32 platform, which has inbuilt Bluetooth, Wifi LR, and ESPNow LR (a Long Range point to point wifi freq network).
>> I'd simply use the ESP to host a website and use a phone browser to display the page or many pages.
>>
>> Great tutorial here, although there are better gauge libraries for data logging/display.
>>
>> https://randomnerdtutorials.com/esp32-web-server-gauges/
>>
>> Regards,
>> Daniel.
>>
>>
>>
>> -----Original Message-----
>> From: Chchrobotics <chchrobotics-bounces at lists.ourshack.com> On Behalf Of Mark Atherton
>> Sent: Sunday, December 10, 2023 12:55 PM
>> To: chchrobotics at lists.ourshack.com
>> Subject: Re: [chbot] Lazy and Blue tooth
>>
>> The pinch-point for the project may be the phone/PC application. Phones tend to have BT built in, but how are you going to support BT on a PC (or do you mean a laptop ?).
>>
>> Start off by writing a decent specification for the phone/PC end so you can clearly see what you are trying to achieve.
>>
>> B4X may be useful start - multi-platform (phone, PC), free, and with support forums. There should be BT examples.
>>
>> There is a low cost BT module called the HC05 - it might do what you want from the 328 end of things but may need another async port. Again, how is this going to connect ?
>>
>> The ESP32 supports BT, so have you considered migrating from a 328 ?
>>
>> Interested to know where you go with this project.
>>
>> -mark
>>
>>
>>
>>
>> On 12/10/2023 12:04 PM, Marshland Engineering wrote:
>> > I have developed an EGT and CHT display for 2 strokes. Easy to see
>> > when riding the bike. Uses an ATMEG328 Never having use Bluetooth
>> > before, I not sure where to start in getting the data to a phone or
>> > PC.
>> >
>> > Basically All I want is to transmit 2 analog signals to a phone/PC.
>> >
>> > Not sure whether to do it live or the ATMEG saves the info and
>> > connects and downloads later.
>> >
>> > A pointer in the right direction would be great.
>> >
>> > Thanks Wallace.
>> >
>> >
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