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upgrade intercom with Alexa



I am new to the forum and automation with this product. I want to make an addition to the intercom in a residential building. There is currently a standard intercom installation, with a button to open the front door. I want to add a device to the intercom system and via Amazon's Alexa. The system is 24V DC and has a button that opens a door. For this I need an option that gives a contact for 5-30 seconds and then the machine automatically shuts off. Is there such a possibility. Other applications of this can be lighting, turning on the camera, etc.  Has anyone made any experience and how it can be done. 

Thank you in advance!

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