Note: Source links are intentionally omitted for publishing convenience; this article is synthesized from real Hackaday and Hackaday.io project information, electronics documentation, and reputable U.S. pet-care, water-conservation, and poultry-health resources.
Every hacker knows the truth: the most demanding user in the house is not the client, the boss, or the person who “just needs one tiny website change.” It is the cat staring at the bathtub faucet like it contains the secrets of the universe. Or the dog who believes dinner is overdue exactly three minutes after breakfast. Or the backyard chicken with enough personality to deserve its own sitcom.
Hacklet #8: The Animals is a delightful snapshot of maker culture at its best: practical, weird, affectionate, and just dangerous enough to involve water, sensors, and pets with opinions. Originally published as part of Hackaday’s Hacklet series, the roundup focused on animal-themed Hackaday.io projects: a smart cat waterer, a cat dissuader, a dog feeding reminder, and a chicken-coop monitoring system. Together, they show how DIY electronics can solve everyday pet problems without turning your home into a full-blown robotics labalthough, let’s be honest, some of us are already halfway there.
This article revisits those projects through a modern SEO-friendly lens, exploring what they teach us about pet technology, animal behavior, sensor design, responsible automation, and the beautiful chaos of building gadgets for creatures who cannot read the manual.
What Is Hacklet #8: The Animals?
Hacklet #8: The Animals was a Hackaday roundup highlighting animal-related hardware projects from Hackaday.io, the collaborative open-hardware community where makers document builds, experiments, code, wiring, failures, and those magical moments when a project finally works after you unplug it and plug it back in.
The four featured builds were not polished consumer products. That is exactly the charm. They were personal solutions to personal problems: one cat wanted fresh running water, another cat needed gentle discouragement from using the bathtub as a bathroom, one dog needed humans who remembered feeding time, and one backyard flock needed remote monitoring. These are not abstract engineering challenges. These are living-room, laundry-room, bathroom, and backyard problemsthe kind that inspire real innovation because the user base has paws, claws, feathers, and zero patience.
Why Animal Hacks Are So Appealing
Animal hacks sit at the perfect intersection of affection and annoyance. We love our pets, but they are also tiny chaos engines wearing fur coats. That combination is rocket fuel for makers. A pet-related project has immediate feedback: the cat either drinks from the new waterer or judges it from across the room. The dog either gets fed on schedule or begins composing a hunger opera. The chickens either stay safe and monitored or begin plotting like feathered supervillains.
These projects also make great learning platforms. They combine common maker skillssensors, relays, timers, 3D printing, low-voltage power, microcontrollers, logic chips, Wi-Fi modules, and environmental sensingwith humane, real-world constraints. A gadget for a pet must be quiet enough, safe enough, rugged enough, and simple enough to work when you are not hovering nearby with a laptop and a cup of coffee.
The Snooty Cat Waterer: Fresh Water for a Faucet Fanatic
The first project in Hacklet #8: The Animals is the wonderfully named Snooty Cat Waterer, built by Brian for his cat Roger. Roger loved drinking from the bathtub faucet. Roger, tragically, had not mastered plumbing. That meant the faucet could be left running, which is bad for water bills, household guilt, and anyone trying to sleep while hearing drip-drip-drip like a tiny aquatic metronome.
Brian’s solution used capacitive sensing, specifically a Microchip MTCH10-style capacitive proximity sensor approach, paired with a home-etched circuit board. The idea was elegant: detect the presence of the cat near the water source and activate the flow automatically. According to the project description, the system could detect the cat from about three inches away. A valve and water feed, teed from the toilet supply, provided the actual water.
Why the Cat Waterer Works as a Design Lesson
The genius of this build is not that it pours water. A bowl can pour water. The genius is that it responds to animal preference. Cats often prefer fresh or moving water, and many cat owners discover that a carefully purchased bowl is apparently less appealing than a suspicious puddle in the bathtub. The Snooty Cat Waterer recognizes the user’s real behavior instead of forcing the user into a human-approved workflow.
That is a serious product-design principle hiding under a very silly cat story: build around actual behavior, not ideal behavior. Roger did not want “hydration infrastructure.” Roger wanted faucet magic. The maker listened.
Safety and Practical Considerations
Water and electronics are not casual roommates. Any DIY pet waterer should use low-voltage control circuits, proper isolation, drip loops, protected enclosures, and fail-safe valve behavior. The safest automation is one that fails closed, not one that creates an indoor koi pond while the cat watches proudly from the hallway.
Water conservation is also a real point. A constantly running or leaking faucet can waste thousands of gallons of water over time, so automating water access only when needed is more than a convenience. It is a small but meaningful example of sustainable pet tech.
The Cat Dissuader: A Gentle “Please Don’t Do That” Machine
The second featured project, Cat Dissuader, tackles a very different feline engineering problem. Jsc’s cat had decided that the bathtub was a perfect litter box. Cats are intelligent animals, but they are also known to make interior-design choices that humans strongly disagree with.
The first attempt involved a servo-controlled squirt bottle, but it was too weak for the job. So Jsc upgraded the system using a Super Soaker Hydrostorm, a motorized water gun. The project avoided permanent modification to the toy by using a 3D-printed switchable battery pack powered by a wall adapter. An Arduino controlled the system, and a passive infrared sensor detected motion.
Behavior First, Gadget Second
This is where responsible pet hacking matters. A deterrent should never be the first or only response to inappropriate elimination. Litter box problems can be caused by stress, box placement, litter preference, cleanliness, conflicts between pets, or medical issues. Before building a gadget that says “no,” a pet owner should ask why the animal is doing the behavior in the first place.
That said, the Cat Dissuader is interesting as a non-destructive automation project. It uses common maker componentsArduino, PIR motion detection, an external power source, 3D printing, and a repurposed consumer objectto solve a location-specific problem. The system is not trying to monitor the whole house. It guards one zone.
Why PIR Sensors Fit the Job
Passive infrared sensors are popular in home automation because they are small, inexpensive, low-power, and simple to connect to a microcontroller. In many builds, the sensor output can be treated like a digital signal: motion detected or no motion detected. That makes PIR sensors a natural fit for projects like motion-triggered lights, alarms, and, in this case, a bathtub defense system that politely says, “Find the litter box, Your Majesty.”
The important lesson is calibration. A sensor that triggers too easily becomes annoying. A sensor that triggers too late is basically decorative. Pet projects need careful testing because animals are smaller, faster, lower to the ground, and far less cooperative than the average electronics tutorial.
Feed the Dog: A Reminder Built from Classic CMOS Logic
The third project, Feed the Dog, may be the most charming because it solves a human problem while pretending to be a dog problem. Colin and his family loved their dog, but they sometimes forgot whether the dog had been fed. Anyone in a busy household understands this. One person feeds the dog. Another person asks if the dog has eaten. The dog says nothing, because the dog has hired an excellent legal team and will happily accept dinner twice.
Instead of using a microcontroller, Colin built the system with old-school 4000-series CMOS logic. The project used a 4060 ripple counter with an internal oscillator as an eight-hour timer, along with a 4013 dual flip-flop. After feeding the dog, a human pressed a button. A green “just fed” LED glowed for about 30 minutes. After around six hours, a red LED came on. After about eight hours, the red LED blinked to announce that it was feeding time again.
Why This Is Beautifully Over-Under-Engineered
Modern makers might instinctively reach for an Arduino, ESP32, Raspberry Pi, app notification, cloud dashboard, and maybe a machine-learning model to identify kibble sadness. Colin’s build goes the opposite direction. It uses simple logic chips to create a physical memory aid. No Wi-Fi. No login. No firmware update. No “your dog feeder has disconnected from the cloud.” Just lights and timing.
That makes the project a useful reminder: the best technology is not always the newest technology. A 4060 counter and 4013 flip-flop can solve a household coordination problem with low cost, low complexity, and high transparency. Everyone can see the LED. Everyone knows what it means. Even the dog may learn that blinking red equals snacks, at which point the dog becomes the project manager.
Pet Feeding Automation Should Support, Not Replace, Care
Automatic feeders and reminders are helpful, but they should not make owners less observant. Appetite changes can be an early sign of illness. A smart feeder that dispenses food perfectly is useful, but a human still needs to notice whether the food is actually being eaten, whether another pet is stealing it, and whether the animal’s weight and energy look normal.
The strongest version of pet technology does not remove humans from care. It reduces forgetfulness, improves consistency, and gives people better information.
What the Chook? A Smart Coop Before Smart Coops Were Cool
The fourth project, What the Chook?, moves the action outdoors. Steve had six backyard chickensor “chooks,” in Australian slangand wanted to monitor their hen-house while away at work. One chicken, memorably named Darth Vader, had taken on an alpha role and was apparently practicing to become a rooster. This is the kind of detail that makes maker documentation worth reading.
The system used a GCDuiNode and several sensors to track the coop environment. Temperature and humidity sensors helped monitor living conditions. A methane detector could indicate when bedding needed attention. An OV528 JPEG camera allowed Steve to capture images of the flock. The system connected over Wi-Fi, and the goal was to run it from a couple of AA batteries.
Why Chicken-Coop Monitoring Makes Sense
Backyard poultry care involves more than tossing feed and collecting eggs. Coops need protection from predators, weather, moisture, drafts, poor ventilation, and disease risks. Sensors can help owners notice patterns: Is the coop getting too humid? Is the temperature spiking? Is bedding overdue for replacement? Are the birds inside when they should be?
A smart chicken coop is not a gimmick when it gives owners better awareness. It becomes a small environmental monitoring station with feathers. That is useful for animal welfare, household planning, and biosecurity.
The Hard Part: Power and Reliability
Outdoor animal projects face harsh realities. Batteries drain. Wi-Fi fades. Chickens peck things that do not need pecking. Moisture finds enclosures. Dust coats sensors. A successful coop monitor needs weather-resistant housing, low-power sleep modes, secure mounting, and easy maintenance. A project that works on a desk for ten minutes is not the same as one that survives a month in a hen-house.
This is where Hacklet-style projects are so valuable. They show the middle of the journey, not just the glossy finish. The unfinished edges are part of the education.
What These Animal Projects Teach Makers
At first glance, Hacklet #8: The Animals looks like a fun roundup of quirky pet gadgets. Look closer, and it becomes a compact course in practical engineering.
1. Solve a Real Problem
Each project begins with a specific frustration: wasted faucet water, bathtub misuse, forgotten feeding times, or missed chicken-coop activity. Specific problems create better designs than vague ideas like “make a smart pet thing.” The more concrete the problem, the easier it is to test success.
2. Match the Sensor to the Animal
Capacitive proximity sensing made sense for a cat approaching a waterer. PIR motion detection made sense for a cat entering a forbidden zone. A simple push-button timer made sense for humans tracking dog feeding. Environmental sensors made sense for a coop. There is no universal sensor, only a better or worse match for the job.
3. Respect Animal Behavior
Animals are not defective humans. A cat choosing running water is not being dramatic; it may simply prefer freshness and motion. A dog asking for a second meal is not evil; it is a dog, and dogs are spiritually committed to snacks. A chicken acting like Darth Vader is not a bug; it is a feature.
The best animal hacks work with these behaviors rather than punishing them blindly.
4. Keep the Human in the Loop
Automation should make care easier, not invisible. Lights, alerts, logs, and cameras can help humans make better decisions. But pet tech should not encourage neglect. If a system feeds, waters, or monitors an animal, it should also make failures obvious.
Modern Ideas Inspired by Hacklet #8: The Animals
If you were updating these projects today, you could add modern features while keeping the same maker spirit. The Snooty Cat Waterer could use a low-power microcontroller, a flow sensor, and a leak detector. The Cat Dissuader could add time windows, sensitivity adjustment, and a safer misting approach. Feed the Dog could become a shared household display with physical buttons and optional phone reminders. What the Chook? could use solar charging, LoRa communication, and a dashboard for temperature, humidity, door state, and feed level.
But the warning is clear: do not upgrade a simple project into a fragile project. More features mean more failure points. Sometimes the blinking LED is better than the app.
Experiences Related to Hacklet #8: The Animals
Anyone who has built technology around animals quickly learns that the animal is not a beta tester. The animal is the final boss. You can create the cleanest enclosure, write the most elegant code, and solder the neatest board of your life, only for a cat to sniff the device once and decide it is cursed. This is not failure. This is product research conducted by a furry executive with strong opinions.
The first experience many makers have with pet projects is humility. A human user may tolerate a confusing button. A cat will not. A dog may tolerate a noisy motor if food appears, but if the motor jams, the dog will escalate the issue to management by barking at 6:12 a.m. Chickens, meanwhile, interact with hardware like tiny velociraptors with office gossip. They peck shiny screws, stand on sensor cables, and treat anything new in the coop as either a threat, a perch, or lunch.
That unpredictability forces better design. You start thinking about cable routing, rounded edges, waterproofing, safe voltages, cleaning access, and whether a device can be reset by a person who is wearing slippers and holding a scoop of kibble. You learn that “works once” is not the same as “works every day.” You learn that a pet device must be boring in the best possible way: consistent, quiet, safe, and easy to understand.
Another common experience is discovering that pet technology is really family technology. Feed the Dog, for example, is less about the dog and more about household communication. The dog already knows the feeding schedule: always now. The humans need the reminder. A simple LED can prevent double feeding, missed meals, and the classic family debate of “I thought you fed him.” That is why physical interfaces still matter. A glowing light on the wall can be more effective than a notification buried under twelve shopping alerts and one suspiciously urgent software update.
Cat projects teach a different lesson: preference beats intention. You may buy a premium ceramic bowl, place it lovingly in the kitchen, and watch your cat drink from a faucet, plant saucer, or the least dignified corner of the bathtub. The Snooty Cat Waterer succeeds conceptually because it accepts the cat’s preference and builds around it. That mindset applies far beyond pet care. Good design starts by watching what users actually do.
Chicken projects add the outdoor reality check. In a house, you mostly battle dust, curious pets, and the occasional spilled drink. In a coop, you battle moisture, ammonia, temperature swings, dirt, insects, predators, and birds who believe every exposed part deserves inspection by beak. A sensor suite in a chicken coop is a crash course in rugged design. It also makes you appreciate environmental data. Once you can see humidity rising or temperature changing, you stop guessing and start managing.
The biggest experience behind Hacklet #8: The Animals is joy. These projects are funny because animals are funny, but they are also sincere. They come from people paying close attention to the creatures in their care. That is the heart of maker culture: notice a problem, build something, share it, laugh at the weird parts, and improve the next version. Whether the user has whiskers, paws, or feathers, the goal is the samemake life a little better, preferably without flooding the bathroom.
Conclusion
Hacklet #8: The Animals remains a memorable example of why DIY hardware culture is so engaging. It is not just about boards, chips, sensors, or code. It is about people using those tools to solve intimate, everyday problems with creativity and humor. A capacitive cat waterer, an Arduino-controlled cat deterrent, a CMOS dog feeding reminder, and a Wi-Fi chicken-coop monitor may seem unrelated, but they share one philosophy: technology works best when it responds to real life.
Animal-centered maker projects also remind us to design with responsibility. Pets and backyard animals depend on humans for safety, health, food, water, and comfort. Automation can help, but it should never replace observation, veterinary care, proper husbandry, or common sense. The best animal hacks are not gadgets that let us forget our animals. They are tools that help us care more consistently, notice more quickly, and laugh more often.
In other words, build the thing. Test the thing. Waterproof the thing. Then let the cat decide whether your engineering degree means anything.
