Non-joke version: <<a href="https://www.creativeapplications.net/project/durr-shivering-bracelet-that-investigates-our-perception-time/" rel="nofollow">https://www.creativeapplications.net/project/durr-shivering-...</a>><p>Discussion: <<a href="https://news.ycombinator.com/item?id=7007731">https://news.ycombinator.com/item?id=7007731</a>>
A NE555 could be sufficient and even more reductionist. =;-) Circuit example <a href="https://theorycircuit.com/ic-555-ic-741/adjustable-duty-cycle-pwm-generator-circuit/" rel="nofollow">https://theorycircuit.com/ic-555-ic-741/adjustable-duty-cycl...</a>
A CD40106 could do the same and would even be more reductionist (and uses less current).
How much current would the capacitor/resistor attached to it use?<p>Modern microcontrollers are insanely power efficient. An ESP32 in "light sleep" (which would be sufficient to serve timer routines) is said to consume <1 mA (at 3.3V), down to ~10 uA (microamps!) in "deep sleep".<p>In other words, 1 year in deep sleep is 315 ampere-seconds or less than 100 mAh.<p>Obviously it's irrelevant in this use case (where the goal is running a motor every wake-up cycle), but nowadays, as absurd as it looks, being power-constrained isn't necessarily a reason to <i>not</i> slap something on it that happens to also be able to do cryptography, connect to WiFi and make HTTPS requests.
Touché ;)
This does the typical "two short buzzes with a break in between". I think that would be hard with a singe NE555, and of course much more annoying/complicated to fine-tune.<p>Also, the random delay between the notifications.
> The medium is the massage.
That’s brilliant. A phone’nt, if you will.
Really needs an update, the No-Tiff-ier, that also doesn't display an image, in addition to the other features.<p>For 2026, the No-Tiff-AIer extension is planned to also not bury you in slop.
This is great for when I'm on the train and don't want to accidentally glance at another person. I can just hold the rectangle in my hand and stare at it!