![]() If you’d rather your in-home traffic light be more useful than realistic, we’ve got plenty of prior art for you to check out. With everything carefully orchestrated, can now get that authentic Australian side-of-the-road experience without having to leave the comfort of his own home. The Arduino Pro Mini used to control the traffic light is not only responsible for playing the tones through a piezo speaker, but as you might expect, for firing off the relays which ultimately control the red and green lamps. From the 973 Hz tone that only lasts 25 ms to the continuous 500 Hz “woodpecker”, every element of the sound was meticulously recreated in his Arduino code. Performing spectral analysis on the audio sample, he was able to figure out the frequency and durations of the eleven individual tones which make up the complete pattern. Working from a video of the traffic light on YouTube, was able to extract and isolate the tones he was after. With far more effort and attention to detail than you’d probably expect, he’s made it so his Australian pedestrian traffic light correctly mimics the complex chirping of the original. His traffic light doesn’t just look the part, it also sounds like the real thing. So how did manage to get his project to stand out from the rest? Interestingly enough, it’s nothing you can see. To get our attention, your traffic light is going to need to have a unique hook. Even using one up to show the real-time status of your build or system resource utilization would be pushing it at this point. Getting an old traffic light and wiring it up to do its thing inside your house isn’t exactly a new trick it’s so common that it wouldn’t normally pass muster for these hallowed pages. In that case, just use a 555.Ĭontinue reading “This Freezer Failure Alarm Keeps Your Spoils Unspoiled” → Posted in Arduino Hacks, Lifehacks Tagged 7-segment display, arduino, Arduino Uno, dht22, freezer, freezer alarm, piezo speaker You could assume that the freezer is freezing as long as it has power. We’ve got the demo video thawing after the break, but you might wanna turn your sound down a lot. And if is ever curious about the temperature in the freezer, it’s right there on the 7-segment. If the Arduino loses sight of the DHT22 temperature sensor inside the freezer, then the alarm sounds continuously. It runs on mains power and uses a 100dB piezo buzzer for ear-splitting effectiveness to alert whenever the freezer is at 32☏/0☌ or above. ’s homemade freezer failure alarm is a cheap and open solution that ticks all the boxen. If you want something done right, you have to do it yourself. And you’d best hope that the freezer fails while you’re home and awake, because they just stop sounding the alarm after a certain amount of time, probably to save battery. A bunch are battery-powered, and many people complain that they’re too quiet to do any good. When started looking at commercial freezer alarms, he found that most of them are a joke. And since they’re usually chillin’ out of sight and full of precious goods, keeping an eye on them is important. ![]() Of course, freezers are only good when they’re operating properly. Deep freezers are a great thing to have, especially when the world gets apocalyptic.
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