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Screensize: 640 x 480 800 x 600 1024 x 768 1280 x 1024 UserName: Password: Format Mode: Basic  Help  Prompt  Format: Font Andale Mono Arial Arial Black Book Antiqua Century Gothic Comic Sans MS Courier New Georgia Impact Lucida Console Script MT Bold Stencil Tahoma Times New Roman Trebuchet MS Verdana   Size 1 2 3 4 5 6   Color Black Red Yellow Pink Green Orange Purple Blue Beige Brown Teal Navy Maroon LimeGreen Message: * HTML is OFF * Forum Code is ON Smilies [quote][i]Originally posted by STEPHAN[/i] [br]Hi, I need to build a little alarm circuit that starts beeping if a door is open for more than a set time, for example 30 seconds. This needs to be build into a save. So, I installed a little switch. Switch opens, circuit waits for 30 seconds, little beeper goes off. Can stay on, until door gets closed. Just to clarify, this is not an official alarm (that’s a different system) and just a reminder to close the door fully. I believe this should be very simple, but I don't know were to start. I am German and now live in the US, but have no idea were to get help. I would appreciate any hint ! Stephan [/quote]    Insert an Image File (GIF, JPG, JPEG, BMP, ZIP, PNG) Check here to include your profile signature.