Some challenges dare you to run a marathon. Others dare you to eat a mountain of hot wings. The
2025 One Hertz Challenge dares you to do something far more chaotic (and honestly, more
revealing): make one thing happen once per second. That’s it. That’s the whole deal.

And the tagline“Drop the beat (but only at 60 BPM)”isn’t just a music joke. It’s a physics
joke that learned how to dance. Because 60 beats per minute is one beat per second. In other
words: 1 Hz. One hertz. The world’s most chill tempo… and also the tempo that will expose every
shortcut, every drift, and every “close enough” you’ve ever told yourself.

Whether you’re here for maker projects, music timing, a calmer nervous system, or just the simple pleasure
of watching something tick with confidence, this is your guide to living life at one hertzwithout turning
into a human metronome who claps on every elevator ride. (Unless you want to. No judgment. Some judgment.)

What “One Hertz” Actually Means (No Lab Coat Required)

Hertz (Hz) is a unit that measures frequencyhow often something repeats in one second.
So:

• 1 Hz = 1 cycle (or event) every second
• 2 Hz = 2 events every second
• 0.5 Hz = 1 event every 2 seconds (the “I’m thinking about it” pace)

Now fold music into the story. BPM means beats per minute. If you want beats per second, you
divide by 60:

• 60 BPM ÷ 60 = 1 beat per second = 1 Hz
• 120 BPM ÷ 60 = 2 beats per second = 2 Hz
• 90 BPM ÷ 60 = 1.5 beats per second = 1.5 Hz

That’s why 60 BPM feels like “clock tempo.” It’s basically the speed your brain already expects when you
watch a second hand march around a dial or a timer count down. Your body and your perception of time are
weirdly on speaking terms at this tempo.

Why 60 BPM Is a Sneaky Big Deal

1) It’s the pace of a relaxed human heartbeat

For many teens and adults, a normal resting heart rate often lands somewhere in the neighborhood of
60–100 beats per minute. “60” is the number that shows up constantly in health and fitness
conversations because it’s both common and easy to convert: 60 BPM = 1 beat per second.

And yesif your heart happens to be beating at exactly 60 BPM, it’s literally doing a perfect one-hertz
performance inside your chest. No stage lighting required. (Please do not request stage lighting for your
chest.)

2) It’s tied to how we define a “second” in the first place

A second isn’t “a second” because it feels like one. Modern timekeeping is based on an insanely consistent
atomic process. The most accurate clocks measure time using the microwave frequency associated with
cesium atomsa number so specific it sounds like someone fell asleep on a calculator:
9,192,631,770 cycles per second.

That’s the core drama of the One Hertz Challenge: you’re trying to create a reliable one-per-second
event in a world where “one second” is secretly “9,192,631,770 atomic wiggles.” Humbling? Yes. Fun?
Also yes.

So What Is the 2025 One Hertz Challenge, Exactly?

The 2025 One Hertz Challenge (hosted through the Hackaday community) set a deceptively simple rule:
design a device where something happens once per second. The “something” can be practical,
ridiculous, artistic, mechanical, digital, biological, or all of the aboveso long as it’s a faithful 1 Hz beat.

The best part: the constraint is tiny, but the creativity it unlocks is massive. A “tick once per second”
requirement forces you to wrestle with timing accuracy, mechanical delays, sensor noise, software drift,
and the uncomfortable truth that your “exact” second is often more like “a vibes-based second.”

Honorable mentions that show the vibe

• Clockwork builds: classic “tick” projects that embrace the timepiece aesthetic and show off
  mechanisms that pulse at 1 Hz.
• Ridiculous builds: projects that do the least practical thing every secondbecause comedy
  is also engineering.
• Precision builds: projects that chase absurd accuracy (think disciplined oscillators and
  stable references).
• “Could Have Used a 555” energy: because the 555 timer chip is basically the folk hero of
  “I need a pulse” electronics lore.

“Drop the Beat” Maker-Style: Real Examples That Made 1 Hz Feel Alive

If you want to understand the challenge, look at the entries that treat 1 Hz as a playground instead of a
prison. Here are a few standout concepts (and why they’re brilliant).

A clock that literally drops the beat: one water drop per second

One entrant built an electromechanical “clock” where a controller triggers a solenoid to release a single
drop from a water-filled syringe once per second. The drop falls into a beakermaking a satisfying sound,
a visible splash, and a surprisingly hypnotic visual effect when dye is added. It’s timekeeping you can
hear, see, and low-key want to film for social media.

It also highlights a hilarious truth: even when the timing is perfect, the experience of the second can
be designed. A second doesn’t have to be a sterile tick. It can be a tiny moment of theatre.

The anti-metronome: “Metronalmost” (almost 60 BPM… never exactly)

Another entry decided to be chaotic on purpose: a metronome that is designed to never tick at exactly
one hertz. It’s driven by a microcontroller and servo, with code crafted to avoid the “perfect second.”
It’s satire with solder (and also a surprisingly sharp lesson: precision is hard, and even tiny choices in
code, motors, and timing accumulate).

A heart-rate sensor that measures BPM and Hz (because biology is a drum machine)

A different entry leaned into the heartbeat connection: a build using an off-the-shelf optical heart sensor
(the same basic idea behind pulse oximetry) plus a microcontroller and small display. The device reports
heart rate in both BPM and Hz. If you’re at 60 BPM, it shows the perfect “1 Hz.”

Besides being cool, it’s also an excellent reminder that “one hertz” isn’t just electronics. It’s physiology.
It’s rhythm. It’s the tempo your body constantly negotiates with stress, sleep, movement, and emotion.

Borrowing time from time itself: using radio time signals as a reference

Some creators went meta and used time broadcast referencessignals designed for stabilityto derive a
one-second rhythm. It’s the engineering equivalent of saying, “If I’m going to be judged on accuracy, I’m
going to borrow accuracy from the people who basically invented accuracy.”

How to “Drop the Beat” at 60 BPM in Real Life (Music, Movement, and Calm)

Even if you never touch a breadboard, the one-hertz idea is weirdly useful. Because a steady 60 BPM click
is a training tool for your brain and body. Here’s how it shows up outside maker culture.

Music: the tempo that exposes every messy habit

Practicing at 60 BPM is like turning on the lights in a room you’ve been “cleaning” in the dark.
Everything shows. Rushed notes. Uneven strums. Drifts in timing you didn’t notice at faster tempos.

A classic practice approach is to start at a comfortable tempo (often around 60 BPM) and gradually increase
the metronome in small steps as you can play cleanly and consistently. At 60, there’s nowhere to hide.
The click feels slow enough to tempt you into guessingso the goal becomes learning to place the note,
not toss it in the general area like a paper airplane.

Movement: using a slow beat to make motion smoother

Here’s the trick: 60 BPM is often too slow for “one step per click” walking, because most people walk
faster than 60 steps per minute. But it’s perfect for structure:

• Half-time/Double-time: treat each click as two steps (or two clicks per step) depending on your pace.
• Form checks: use the click as a reminder to check posture, shoulder tension, or breathing every second.
• Rehab-style rhythm cues: research on rhythmic auditory stimulation often uses steady beats to support more consistent gait training.

The point isn’t to force your body to march like a robot. It’s to borrow the steadiness of an external
rhythm when your internal rhythm gets sloppyespecially when you’re tired, stressed, or distracted.

Calm: turning 1 Hz into a “counting rail” for breathing

A one-second beat is an underrated tool for paced breathing. Not because you should breathe once per
second (please don’t), but because counting in seconds makes breathing patterns easier to repeat.
Many slow-breathing routines are built around consistent counts (for example, inhale for 4 seconds,
exhale for 6 seconds, repeat).

Research on slow-paced breathing often explores how slower, steadier breathing can influence heart rate
variability and perceived stress. The one-hertz click gives you a simple scaffold: you’re not guessing time;
you’re riding time.

Want to Try the One Hertz Challenge Yourself? Start Here (Safely)

The challenge spirit is “once per second,” not “overcomplicate everything until your desk becomes a tiny
power plant.” If you want to play alongmaker-stylehere are friendly, low-drama ways to do it.

Step 1: Pick a one-second event you can see or hear

• A screen that updates once per second
• A soft click, beep, or chime
• A small animation (like a dot moving one step each second)
• A light that fades up/down once per second

Step 2: Decide what “accuracy” means for your version

Some projects aim for “visually one-per-second.” Others chase precision with stable references. Either is valid
as long as you’re honest about your goal. The fun is learning what causes drift: temperature, software timing,
mechanical lag, sensor noise, or “I forgot computers also get tired when I open 37 browser tabs.”

Step 3: Make it delightful (this is the secret sauce)

The coolest one-hertz projects don’t just tickthey perform. A water drop. A mechanical flip. A tiny
display that tells a joke once per second (dangerous, but noble). A visual that turns time into a texture.

Safety note: if you build anything physical, keep it low-voltage and keep liquids away from electronics
unless you’re deliberately designing the separation. “My clock is also a smoke machine” is not a flex.

Why One Hertz Is Harder Than It Looks (And That’s Why It’s Fun)

If you’ve ever tried to clap exactly once per second for a full minute, you already know: humans drift.
But electronics drift too. Motors have inertia. Software timers aren’t always perfectly timed. Even the
“simple” act of blinking a light can reveal that your “one second” becomes “one second-ish” over time.

The challenge is a tiny, friendly lesson in measurement science: you’re not just building a thing; you’re
building a relationship between a physical system and a definition of time. And the second you take it
seriously, you learn something.

What You Really Win When You Live at 60 BPM for a While

The prize isn’t just bragging rights (though, yes, you should brag tastefully). The real payoff is that
one hertz forces you to practice three skills that transfer everywhere:

• Consistency: doing the same thing repeatedly without losing the plot.
• Feedback: noticing drift and correcting it instead of pretending it’s not happening.
• Design: making something functional and satisfying to experience.

In a world that loves speed, 1 Hz is quietly rebellious. It says: slow down enough to be accurate.
Slow down enough to be intentional. Slow down enough to make the second feel like something.

Experiences: My (Very Scientific) Week of Dropping the Beat at 60 BPM

I tried the “one hertz lifestyle” for a weeknot as a strict rule, but as a playful experiment. The idea was
simple: use a steady 60 BPM click as a background reference for small parts of my day, just long enough to
notice what changed.

Day one was the honeymoon phase. I set a metronome to 60 BPM and did the most obvious thing: I tapped
along. Instantly, I felt like a time wizard… for about twelve seconds. Then I realized my taps weren’t
landing on the clicksometimes they landed slightly before it, like I was trying to impress the
metronome with my “initiative.” The click did not applaud. It simply continued existing, perfectly
unbothered, like a cat.

By day two, I used the beat for something more useful: pacing a short breathing routine. Not one breath
per secondmore like counting seconds so the rhythm stayed consistent. I tried inhale for four beats,
exhale for six. The surprising part wasn’t the breathing; it was how quickly my brain stopped arguing.
When you’re counting with a steady click, you don’t negotiate with time. You follow it. That tiny shift
made the routine feel less like “work” and more like “riding a moving walkway.”

Day three got musical. I played a simple pattern to the click at 60 BPM and discovered the truth every
musician eventually meets: slow is not easy. Slow is honest. At faster tempos, you can blur small
mistakes into momentum. At 60, each note stands alone like it’s being introduced at a formal dinner.
“This is my friend, The Slightly Rushed Eighth Note.” Nobody likes that guy. So I started placing notes
carefully, aiming for calm accuracy instead of speed. It was frustrating in the way that a good workout
is frustrating: you can feel the skill being built in real time.

Day four was movement day. I didn’t try to step once per click (that would’ve turned my walk into a slow-motion
documentary about sidewalks). Instead, I used the click as a “check-in.” Every second: shoulders down, jaw
unclenched, breathe. It was basically posture policing, but in a friendly, rhythmic way. The beat became a
reminder that tension builds quietlyand can be released quietly too.

Day five, I leaned into the “drop the beat” pun and watched a slow visualization on screen that updated once
per second. It was oddly comforting. The one-second rhythm gave the day a texturelike the difference between
noisy rain and steady rain. Not better, not worse. Just steadier.

By the end of the week, the biggest change wasn’t that I became more “perfect” at timing. It was that I started
respecting timing. The click made me notice drift in my playing, my attention, and even my mood. Sometimes I was
ahead (rushing). Sometimes I lagged (dragging). And sometimes, rarely, I landed right on the beatcalm,
centered, and a little proud for absolutely no reason other than: “Hey. That was a clean second.”

The 2025 One Hertz Challenge is fun because it’s tiny. But the lesson is big: one second is a unit of time,
sure. It’s also a unit of awarenessif you let it be.

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