On Tue, 20 Jul 2021 at 16:56, Anne Ranch <anneranch2442@...> wrote:
OK, I shall proceed. Let me say that I am unable to find HC-05 specification which will actually describe 1. what does the button on my HC_05 do. I realize there are many versions of HC-05 and I am talking abut the one WITH the button - the one I have. 2. My HC_05 ONLY connection is to power - no other connections. I am currently trying to decipher the RED LED functions ON:LY. a. Upon applying power I get very short and very fast flashing of the LED b. After that and MOST of the time the LED is flashing in fast rate c. BUT sometime it will flash in slow rate
The doc I found describe 1 Hz or 2 Hz "flashing" and it should be observable on pin x - I have not try that.
However - I am not sure if human eye can even see DIFFERENCE between 1 Hz and 2 Hz.
3. My OS - Linux Ubuntu can "discover" the HC-05. Term "discovery /discoverable " Is commonly used describing Bluetooth process to "find" or enabling the Bluetooth device to be found. 4. I can instruct OS to "connect" to HC-05 - it does do that but immediately "disconnects" . ( The process of selecting RF channels MAY be discussed later ) 5. After spending many hours , by choice , coding software I came to a conclusion that "Bluetooth devices must be PAIRED " before they can be connected. Makes sense to me, however I do not get how device can be "discovered " and NOT paired. My OS shows HC_05 as "paired ".
