How to get a pulse in a specified sampletime

Hi.
We are making a LabVIEW program to communicate with PumpWorks through DDE, and have established communication.
The problem we can't find a solution to is this:
We want to start the pump (TRUE) and stop (FALSE) it in LabVIEW. PumpWorks can only recive the message one time, or else we get errors. How can we send a '1' - only one time when we press a button i LabVIEW, and send '0' one time when we press the button again.
We were thinking of a solution where we calculate the sampletime, and thereby only sends the message once - but we can't find a way to program it.
Does anyone have an idea on how to fix this? We need a pulse in just one sample when pressed start/stop. The rest of the time we shouldn't send anything.
Thanks for your help!
Is my avatar the dog from the fraggle rock?
Solved!
Go to Solution.

Okey, thank you again
The finished VI with the "pulse" is uploaded under here.
Is my avatar the dog from the fraggle rock?
Attachments:
valuechange.vi ‏19 KB

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