I am very new to Arduino( only done the blink sketch so far
) but I have worked a little with stamp controllers and basic language. I am looking to make a countdown timer that starts at about 4 minutes and counts down to 0 and when it hits 0 I would like it to do a contact closure. I would eventually like to be able to increase or decrease the time with a rotary encoder but I want to start with the basics for now. The application will be for a train simulator that I have built for a museum. I want to limit the time that the museum patrons can spend as to give others a chance to use the simulator. The contact closure tells my keyboard encoder to send the reset signal to the train simulator. Not that it is needed but I have posted a link to my blog of the train sim build below.
Any help would be greatly appreciated.