ESP32cam Robot Car

@pkdj

Maybe I'm misinterpreting your question, but I don't think this is an html problem.

Just work this button the opposite way from the other buttons. Start with the camera wired on and label the button "Camera off". When the button is pressed, turn the camera off and change the button label to "Camera on" and when it's pressed turn the camera on and change the button label as above. Rinse and repeat 🙂

Hi Will

Thanks for your response. You are spot on with your understanding of my request and that’s exactly how I would like it to work but unfortunately I can’t fathom out how that particular button works and how to ‘reverse’ its operation.

@pkdj 

OK, let's try it from a different direction, have you created any other buttons that work to turn something to "on" which started in the off position ?

Hi Will,

Yes, I have created an additional 6 buttons which activate various actions when pressed.  All of these buttons return a variable when pressed and it just a matter of checking the variable and coding according with ‘if’ statements. I created the additional buttons by copying/pasting/ modifying the html and associated code once J worked out how those buttons worked.

The HTML for the video stream button is more complicated and I can’t work out where the stream is turned on/off and how the button does it. 

@pkdj 

I'm confused, you already have a working button to start and stop the camera ?

@pkdj How far does WiFi penetrate water?

Hi Ron

WiFi does not penetrate water ( as far as I am aware) because frequency is too high, but with the ESP32CAM board you can attach an external antenna.  So I have tested adding an antenna with a 5 metre extension cable and range is not affected by the extension cable. So my plan is that the ROV will be underwater but the antenna will be mounted on a float above the water connected to the ROV by the extension cable

@will I took a quick peek at the project, it looks to me like the buttons are a part of the HTML. I have zero training or experience with HTML so can't help too much.

Hi Will

Yes there is already a button but on power up the default status of the stream is off and I have to press the button to turn it on.  I’d like to change it so that on power up the stream is on without having to press the button. Just can’t work out how to make that change. I can see that it is something to do with the line of HTML that starts with ‘document.addEventListener’ and have tried a few changes without success.

@pkdj I take it you have no training in antenna theory and design.

Hi Ron

you are correct, no training in antenna design. Purely working on the ‘suck it and see’ method and practical results.

@pkdj Since you have no profile info re training, experience and I don't see an entry in the introduction forum for you telling us that plus a BRIEF first project description, it's very difficult to use the appropriate language to your training/experience. From what little I have seen you will need to be relatively experienced in HTML otherwise it will be a MAJOR challenge. Good luck.

@pkdj VERY roughly, antennas must be the correct length for the frequency. You can't just add a random length cable, and these frequencies (2.5/5GHz) require very small antennas. I am planning on building a ROV too, I will use ethernet, not WiFi.