#2025hackadayonehertzchallenge — Public Fediverse posts

2025 One Hertz Challenge: Atomic Decay Clock is Accurate But Not Precise - At this point, atomic clocks are old news. They’ve been quietly keeping our world ... - https://hackaday.com/2025/08/19/2025-one-hertz-challenge-atomic-decay-clock-is-accurate-but-not-precise/ #2025hackadayonehertzchallenge #radioactivedecay #geiger-muller #atomicclock #radioactive #clockhacks #geigertube #contests

2025 One Hertz Challenge: Atomic Decay Clock is Accurate But Not Precise https://hackaday.com/2025/08/19/2025-one-hertz-challenge-atomic-decay-clock-is-accurate-but-not-precise/ #2025HackadayOneHertzChallenge #radioactivedecay #geiger-muller #atomicclock #radioactive #clockhacks #Geigertube #contests

2025 One Hertz Challenge: Timekeeping at One Becquerel https://hackaday.com/2025/08/18/2025-one-hertz-challenge-timekeeping-at-one-becquerel/ #2025HackadayOneHertzChallenge #gammarayspectroscopy #americium-241 #Vetinariclock #scintillator #clockhacks #contests

2025 One Hertz Challenge: Timekeeping at One Becquerel - The Becquerel (Bq) is an SI unit of radioactivity: one becquerel is equivalent to ... - https://hackaday.com/2025/08/18/2025-one-hertz-challenge-timekeeping-at-one-becquerel/ #2025hackadayonehertzchallenge #gammarayspectroscopy #americium-241 #vetinariclock #scintillator #clockhacks #contests

2025 One Hertz Challenge: A Flaming Oscillator and a New Take on the Candle Clock https://hackaday.com/2025/08/17/2025-one-hertz-challenge-a-flaming-oscillator-and-a-new-take-on-the-candle-clock/ #2025HackadayOneHertzChallenge #capacitancesensor #candleflicker #oscillator #contests #CH32V003 #candle

2025 One Hertz Challenge: A Flaming Oscillator and a New Take on the Candle Clock - Candle clocks were once an easy way to build a clock without using complex mechan... - https://hackaday.com/2025/08/17/2025-one-hertz-challenge-a-flaming-oscillator-and-a-new-take-on-the-candle-clock/ #2025hackadayonehertzchallenge #capacitancesensor #candleflicker #oscillator #contests #ch32v003 #candle

2025 One Hertz Challenge: STM32 Blinks In Under 50 Bytes https://hackaday.com/2025/08/16/2025-one-hertz-challenge-stm32-blinks-in-under-50-bytes/ #2025HackadayOneHertzChallenge #Microcontrollers #STM32F4 #stm32

2025 One Hertz Challenge: STM32 Blinks In Under 50 Bytes - Many of us have run a Blink program on a microcontroller before. It’s effectively ... - https://hackaday.com/2025/08/16/2025-one-hertz-challenge-stm32-blinks-in-under-50-bytes/ #2025hackadayonehertzchallenge #microcontrollers #stm32f4 #stm32

2025 One Hertz Challenge: An Arduino-Based Heart Rate Sensor https://hackaday.com/2025/08/15/2025-one-hertz-challenge-an-arduino-based-heart-rate-sensor/ #2025HackadayOneHertzChallenge #heartratesensor #pulseoximeter #Pulseoximetry #heartrate #contests

2025 One Hertz Challenge: An Arduino-Based Heart Rate Sensor https://hackaday.com/2025/08/15/2025-one-hertz-challenge-an-arduino-based-heart-rate-sensor/ #2025HackadayOneHertzChallenge #heartratesensor #pulseoximeter #Pulseoximetry #heartrate #contests

2025 One Hertz Challenge: An Arduino-Based Heart Rate Sensor https://hackaday.com/2025/08/15/2025-one-hertz-challenge-an-arduino-based-heart-rate-sensor/ #2025HackadayOneHertzChallenge #heartratesensor #pulseoximeter #Pulseoximetry #heartrate #contests

2025 One Hertz Challenge: An Arduino-Based Heart Rate Sensor https://hackaday.com/2025/08/15/2025-one-hertz-challenge-an-arduino-based-heart-rate-sensor/ #2025HackadayOneHertzChallenge #heartratesensor #pulseoximeter #Pulseoximetry #heartrate #contests

2025 One Hertz Challenge: An Arduino-Based Heart Rate Sensor - How fast does your heart beat? It’s a tough question to answer, because our heart ... - https://hackaday.com/2025/08/15/2025-one-hertz-challenge-an-arduino-based-heart-rate-sensor/ #2025hackadayonehertzchallenge #heartratesensor #pulseoximeter #pulseoximetry #heartrate #contests

2025 One Hertz Challenge: An Arduino-Based Heart Rate Sensor - How fast does your heart beat? It’s a tough question to answer, because our heart ... - https://hackaday.com/2025/08/15/2025-one-hertz-challenge-an-arduino-based-heart-rate-sensor/ #2025hackadayonehertzchallenge #heartratesensor #pulseoximeter #pulseoximetry #heartrate #contests

2025 One Hertz Challenge: An Arduino-Based Heart Rate Sensor - How fast does your heart beat? It’s a tough question to answer, because our heart ... - https://hackaday.com/2025/08/15/2025-one-hertz-challenge-an-arduino-based-heart-rate-sensor/ #2025hackadayonehertzchallenge #heartratesensor #pulseoximeter #pulseoximetry #heartrate #contests

2025 One Hertz Challenge: An Arduino-Based Heart Rate Sensor - How fast does your heart beat? It’s a tough question to answer, because our heart ... - https://hackaday.com/2025/08/15/2025-one-hertz-challenge-an-arduino-based-heart-rate-sensor/ #2025hackadayonehertzchallenge #heartratesensor #pulseoximeter #pulseoximetry #heartrate #contests

2025 One Hertz Challenge: An Arduino-Based Heart Rate Sensor - How fast does your heart beat? It’s a tough question to answer, because our heart ... - https://hackaday.com/2025/08/15/2025-one-hertz-challenge-an-arduino-based-heart-rate-sensor/ #2025hackadayonehertzchallenge #heartratesensor #pulseoximeter #pulseoximetry #heartrate #contests

2025 One Hertz Challenge: A Game Of Life https://hackaday.com/2025/08/13/2025-one-hertz-challenge-a-game-of-life/ #2025HackadayOneHertzChallenge #conwaysgameoflife #gameoflife #contests #attiny85 #conway

2025 One Hertz Challenge: A Game Of Life - The 2025 One Hertz Challenge asks you to build a project that does something once ... - https://hackaday.com/2025/08/13/2025-one-hertz-challenge-a-game-of-life/ #2025hackadayonehertzchallenge #conwaysgameoflife #gameoflife #contests #attiny85 #conway

2025 One Hertz Challenge: Abstract Aircraft Sculpture Based On Lighting Regulations - The 2025 One Hertz Challenge is really heating up with all kinds of projects that ... - https://hackaday.com/2025/08/12/2025-one-hertz-challenge-abstract-aircraft-sculpture-based-on-lighting-regulations/ #2025hackadayonehertzchallenge #contests #ledhacks #attiny85 #coincell #led

2025 One Hertz Challenge: Using Industrial Relays to Make a Flasher https://hackaday.com/2025/08/10/2025-one-hertz-challenge-using-industrial-relays-to-make-a-flasher/ #2025HackadayOneHertzChallenge #flashercircuit #electronics #electronic #contests #flasher #relay

2025 One Hertz Challenge: Using Industrial Relays to Make a Flasher - These days, if you want to flash some LEDs, you’d probably grab a microcontroller.... - https://hackaday.com/2025/08/10/2025-one-hertz-challenge-using-industrial-relays-to-make-a-flasher/ #2025hackadayonehertzchallenge #flashercircuit #electronics #electronic #contests #flasher #relay

2025 One Hertz Challenge: The Real-Time Clock The VIC-20 Never Had https://hackaday.com/2025/08/08/2025-one-hertz-challenge-the-real-time-clock-the-vic-20-never-had/ #2025HackadayOneHertzChallenge #Retrocomputing #realtimeclock #contests #VIC-20

2025 One Hertz Challenge: The Real-Time Clock The VIC-20 Never Had - Like many early microcomputers, the Commodore VIC-20 did not come with an interna ... - https://hackaday.com/2025/08/08/2025-one-hertz-challenge-the-real-time-clock-the-vic-20-never-had/ #2025hackadayonehertzchallenge #retrocomputing #realtimeclock #contests #vic-20

2025 One Hertz Challenge: The Easy Way to Make a Nixie Tube Clock - Let’s say you want to build a Nixie clock. You could go out and find some tubes, s... - https://hackaday.com/2025/08/07/2025-one-hertz-challenge-the-easy-way-to-make-a-nixie-tube-clock/ #2025hackadayonehertzchallenge #frequencycounter #clockhacks #nixietube #contests #clock #nixie

2025 One Hertz Challenge: 4-Function Frequency Counter https://hackaday.com/2025/07/31/2025-one-hertz-challenge-4-function-frequency-counter/ #2025HackadayOneHertzChallenge #frequencycounter #ToolHacks #frequency

2025 One Hertz Challenge: 4-Function Frequency Counter - Frequency! It’s an important thing to measure, which is why [Jacques Pelletier] bu... - https://hackaday.com/2025/07/31/2025-one-hertz-challenge-4-function-frequency-counter/ #2025hackadayonehertzchallenge #frequencycounter #toolhacks #frequency

2025 One Hertz Challenge: Op-Amp Madness - Sometimes, there are too many choices in this world. My benchtop function generato... - https://hackaday.com/2025/07/31/2025-one-hertz-challenge-op-amp-madness/ #2025hackadayonehertzchallenge #clockhacks #oscillator #hardware #sinewave #analog #op-amp

2025 One Hertz Challenge: Op-Amp Madness - Sometimes, there are too many choices in this world. My benchtop function generato... - https://hackaday.com/2025/07/31/2025-one-hertz-challenge-op-amp-madness/ #2025hackadayonehertzchallenge #clockhacks #oscillator #hardware #sinewave #analog #op-amp

2025 One Hertz Challenge: Op-Amp Madness - Sometimes, there are too many choices in this world. My benchtop function generato... - https://hackaday.com/2025/07/31/2025-one-hertz-challenge-op-amp-madness/ #2025hackadayonehertzchallenge #clockhacks #oscillator #hardware #sinewave #analog #op-amp

2025 One Hertz Challenge: Op-Amp Madness - Sometimes, there are too many choices in this world. My benchtop function generato... - https://hackaday.com/2025/07/31/2025-one-hertz-challenge-op-amp-madness/ #2025hackadayonehertzchallenge #clockhacks #oscillator #hardware #sinewave #analog #op-amp

2025 One Hertz Challenge: Op-Amp Madness - Sometimes, there are too many choices in this world. My benchtop function generato... - https://hackaday.com/2025/07/31/2025-one-hertz-challenge-op-amp-madness/ #2025hackadayonehertzchallenge #clockhacks #oscillator #hardware #sinewave #analog #op-amp

2025 One-Hertz Challenge: A Software-Only AM Radio Transmitter https://hackaday.com/2025/07/30/2025-one-hertz-challenge-a-software-only-am-radio-transmitter/ #2025HackadayOneHertzChallenge #amplitudemodulation #twilightzone #RadioHacks #amradio #am

2025 One-Hertz Challenge: A Software-Only AM Radio Transmitter - We’ve been loving the variety of entries to the 2025 One-Hertz Challenge. Many a c... - https://hackaday.com/2025/07/30/2025-one-hertz-challenge-a-software-only-am-radio-transmitter/ #2025hackadayonehertzchallenge #amplitudemodulation #twilightzone #radiohacks #amradio #am

2025 One-Hertz Challenge: Clock Calibrator https://hackaday.com/2025/07/28/2025-one-hertz-challenge-clock-calibrator/ #2025HackadayOneHertzChallenge #clockcalibration #calibration #clockhacks #contests #timing #clock

2025 One-Hertz Challenge: Clock Calibrator - Wall clocks! Are they very accurate? Well, sometimes they are, and sometimes they ... - https://hackaday.com/2025/07/28/2025-one-hertz-challenge-clock-calibrator/ #2025hackadayonehertzchallenge #clockcalibration #calibration #clockhacks #contests #timing #clock

2025 One Hertz Challenge: RPI TinynumberHat9 https://hackaday.com/2025/07/27/2025-one-hertz-challenge-rpi-tinynumberhat9/ #2025HackadayOneHertzChallenge #contests #HT16K33

2025 One Hertz Challenge: RPI TinynumberHat9 - This eye-catching entry to the One Hertz Challenge pairs vintage LED indicators wi... - https://hackaday.com/2025/07/27/2025-one-hertz-challenge-rpi-tinynumberhat9/ #2025hackadayonehertzchallenge #contests #ht16k33

2025 One Hertz Challenge: 555 Timer Gets a Signal From Above - One of the categories we chose for the One Hertz Challenge is “Could Have Used a 5... - https://hackaday.com/2025/07/24/2025-one-hertz-challenge-555-timer-gets-a-signal-from-above/ #2025hackadayonehertzchallenge #microcontrollers #allandeviation #timekeeping #contests #hardware #555timer #gpsdo #gps

2025 One Hertz Challenge: 555 Timer Gets a Signal From Above https://hackaday.com/2025/07/24/2025-one-hertz-challenge-555-timer-gets-a-signal-from-above/ #2025HackadayOneHertzChallenge #Microcontrollers #allandeviation #timekeeping #contests #hardware #555timer #gpsdo #gps

2025 One Hertz Challenge: 16-Bit Tower Blinks at One Hertz https://hackaday.com/2025/07/23/2025-one-hertz-challenge-16-bit-tower-blinks-at-one-hertz/ #2025HackadayOneHertzChallenge #relaycomputer #relaylogic #contests #diycpu

2025 One Hertz Challenge: 16-Bit Tower Blinks at One Hertz - We’ve seen our share of blinking light projects around here; most are fairly strai... - https://hackaday.com/2025/07/23/2025-one-hertz-challenge-16-bit-tower-blinks-at-one-hertz/ #2025hackadayonehertzchallenge #relaycomputer #relaylogic #contests #diycpu

2025 One-Hertz Challenge: ZX Spectrum Is Now A Z80 Frequency Counter https://hackaday.com/2025/07/18/2025-one-hertz-challenge-zx-spectrum-is-now-a-z80-frequency-counter/ #2025HackadayOneHertzChallenge #frequencycounter #Retrocomputing #retrocomputing #ZXSpectrum #spectrum #spectru

2025 One-Hertz Challenge: ZX Spectrum Is Now A Z80 Frequency Counter - The ZX Spectrum is perhaps most fondly remembered as a home computer and a games m... - https://hackaday.com/2025/07/18/2025-one-hertz-challenge-zx-spectrum-is-now-a-z80-frequency-counter/ #2025hackadayonehertzchallenge #frequencycounter #retrocomputing #zxspectrum #spectrum #spectru

2025 One-Hertz Challenge: HP Logic Probe Brought Into The Future - [Robert Morrison] had an ancient HP 545A logic probe, which was great for debuggin... - https://hackaday.com/2025/07/18/2025-one-hertz-challenge-hp-logic-probe-brought-into-the-future/ #2025hackadayonehertzchallenge #hewlettpackard #logicprobe #toolhacks #contests #logic #hp

2025 One-Hertz Challenge: HP Logic Probe Brought Into The Future https://hackaday.com/2025/07/18/2025-one-hertz-challenge-hp-logic-probe-brought-into-the-future/ #2025HackadayOneHertzChallenge #hewlettpackard #logicprobe #ToolHacks #contests #logic #HP

2025 One Hertz Challenge: Building a Better Jumping Bean - Do you feel nostalgia for a childhood novelty toy that had potential but ultimatel... - https://hackaday.com/2025/07/17/2025-one-hertz-challenge-building-a-better-jumping-bean/ #2025hackadayonehertzchallenge #microcontrollers #vibrationmotor #toyhacks #jumping

2025 One Hertz Challenge: Building a Better Jumping Bean https://hackaday.com/2025/07/17/2025-one-hertz-challenge-building-a-better-jumping-bean/ #2025HackadayOneHertzChallenge #Microcontrollers #vibrationmotor #ToyHacks #jumping