Looking for some info from the Gurus

Brian Carpenter

iave two devices that need to work together.·· One is·an HID device that toggles a line. first time it is·high- and changes to low_.· so -_.· the next time that it triggered it goes from low_ to high-.· so _-.· the second device that it is talking to wants to see a Low to high to low. or a High to low to high.· i can make it work with either.
So here is the problem,· The second device wants to see -_- in order to do its function.
that means that i have to activate the HID device twice to get it to move from -_ and _- to accomplish this.
I only want to activate the HID once to trigger the second device, so i need to make an interface that will go between the two devices.·
it needs to take the -_ and create a -_- and then the next time it will see a _- and will again put out a -_-.

Any ideas will be greatly appreciated.

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It's Only A Stupid Question If You Have Not Googled It First!!

Brian Carpenter

thanks for your help bean

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It's Only A Stupid Question If You Have Not Googled It First!!

Bean

You are welcome.
For anyone else that wants to do this without a controller, I would think that an XOR gate where the input went directly to one input, and and RC on the other input would do the job too.

Toggle Output --+---------------- XOR input 1
                |
                +-/\/\/\--+------ XOR input 2
                          |
                          +--|(-- Ground

The XOR output should be low normally. When the Toggle Output changes you should get a high pulse on the XOR output related to the R and C values.

Bean.

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Post Edited (Bean (Hitt Consulting)) : 3/24/2008 1:23:56 PM GMT