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A single rod model rocket launch control system using the Arduino Nano
...The system utilizes the Arduino Uno/Nano to report on local weather conditions (temperature, humidity, barometric pressure). The system also provides a 10-second countdown when the fire button is pressed.
The system meets and exceeds the NAR Safety Code standard for model rocket launch systems as it incorporates a removable key to block the flow of power to the launch pad. It incorporates an additional two-button safety system to ensure that a launch is conducted exactly at the desired time.
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This windows command line utility will wait a specified number of seconds or until a specific time of day. It can be aborted by a key-press. It returns an error level of 1 if a key was pressed. Shows countdown for seconds.
This program implements the Sleep Timer function for Lirc. While watching TV at night, you can use the remote control to program a countdown to shutdown the computer.
A PalmOS combination countdown timer and score tracking device designed primarily for refereeing fencing bouts. The current version works somewhat well in Palm OS 3.5, but on other Palm versions accessing various functions causes seg faults.
dockclock is a small, fast docking applett designed to work with fluxbox / blackbox. Showing the time and date is its main purpose, but an alarm of two types - countdown and a standard one will be supported.