Trggering a relay with a button..

[rwmetts]

Hello everyone, I am in need of help in trying to fire a relay to an digital I/O controller relay from a web page. I have seen this in other web pages. Example: You push a Button and it fires a relay on a com port on the pc which allows a light to come on. I am not sure if this is where this should be posted..any help in code would be greatly helpfull....Thanks: confused:

[rangana]

I think what you're trying to do couln't be done by HTML alone. You need Javascript, but that's yet to be know.

Could you please provide a link to where you've seen that effect. Your description is vague to me.

[rwmetts]

Hi thanks for the information, it is not done with weboages persay, but done with a program that uses internet explorer to trigger a digital relat to fire to turn on and off other devices.

Maybe it is a program that runs on a pc that triggers a relay through internet explorer to allow switches to work within a html or java enviroment...

thanks

[rangana]

My apologies, but I'm unaware about Java.

[jthayne]

Due to it's nature, Javascript, HTML, AJAX, and other Client-Side languages are unable to interface with a computer's hardware on its own. There will need to be a Browser Helper Object (BHO) installed that will act as a liason between the web page and the hardware in order for this to happen.

Unfortunately, this is a technique that various types of malware use to infect a user's PC. As such, most users will not install it, and the more paranoid ones (like me) would not even visit your site again.

As for how to do it, I honestly have no idea how to do it.