Every couple of weeks, [Roo’s] place of employment, TMW Unlimited, has a contest. This contest takes place in the form of a game show and the contestants have 30 seconds to pitch their current project to the group. A panel of judges vote on the best pitches. Winners receive cupcakes and drinks. Originally, stopwatches were used to keep track of the elapsed time, however, a stopwatch is not very game showy. [Roo] set out to make a countdown timer to add some authenticity to the bi-weekly event.
The main enclosure is a plastic fence post. Fifteen holes and 15 large LEDs are covered up by large plastic translucent spheres. End caps were designed and 3D printed to not only make the rig look good but also to serve as a speaker mount. Inside resides an Arduino that does the counting and turns off the row of lights, one every 2 seconds, as the countdown continues. A speaker not only ticks and tocks its way down with the lights, it also buzzes when time is up. Starting and resetting the timer is as easy as pushing a single button mounted on the case.
If you’ve already built a game show timer, you may want to check out this DIY game buzzer system!
Continue reading “Nice Looking Countdown Timer for the Home Game Show Enthusiast”
[Rod] is in a position to provide a community service on New Year’s Eve. He spends the evening at a relative’s house next to the beach. There are fireworks at midnight, but the crowd has no communal way to count down to the deadline. This year, he build his own count-down display so that everyone can join in during the last few seconds.
This is a temporary build so each digit is housed in a cardboard box. [Rod] first drew the outline of the seven segment digit on the front, then added holes for three LEDs in each segment. He’s feeding the segments with 12V and therefore is able to run the LEDs in series, along with a resistor, switching each segment with one transistor. He chose an Arduino to drive the display, and since he had two sitting around, used both instead of grabbing a shift register as port expander.
If you’re looking for a more permanent solution, we really like the digit displays designed for this scoreboard. But you’re going to have to etch the boards yourself if you want them done in time for the festivities.
It’s officially September now (in some parts of the world), and that means we’ve been watching the Christmas decorations go up on the floor of Costco, Walmart and Target for the last few weeks. As a small test of reality, [Eric] decided to build an electronic advent calendar that counts down the days until Christmas. As a simple build using parts lying around on the bench, [Eric] did a pretty good job at deferring his kid’s questions of, “How long until Christmas?” to a machine.
The build is fairly bare-bones, using only an Arduino Pro Mini, RTC and LCD display. For the real-time clock, [Eric] used the ever popular DS3231 RTC. The software reads the time from the clock and calculates the number of seconds between the present time and the hard-coded target date.
Everything is powered by a 9 Volt battery that wouldn’t last the remaining 115 days until Christmas. There is a power switch and the RTC has a battery backup, so the build will probably suffice for all but the most fanatical child.