What Unicode characters represent "time"? - unicode

What Unicode character symbol(s) express duration (such as a clock, hourglass, or other timepiece)?
For example "★3⅔" instead of "3 hours and forty minutes", where ★ is a time symbol.

The following code points exist related to clocks, watches, and other devices to indicate time:
⌚ U+0231A WATCH
⌛ U+0231B HOURGLASS
⏰ U+023F0 ALARM CLOCK
⏱ U+023F1 STOPWATCH
⏲ U+023F2 TIMER CLOCK
⏳ U+023F3 HOURGLASS WITH FLOWING SAND
⧖ U+029D6 WHITE HOURGLASS
⧗ U+029D7 BLACK HOURGLASS
📅 U+1F4C5 CALENDAR
📆 U+1F4C6 TEAR-OFF CALENDAR
🕐 U+1F550 CLOCK FACE ONE OCLOCK
🕜 U+1F55C CLOCK FACE ONE-THIRTY
🕑 U+1F551 CLOCK FACE TWO OCLOCK
🕝 U+1F55D CLOCK FACE TWO-THIRTY
🕒 U+1F552 CLOCK FACE THREE OCLOCK
🕞 U+1F55E CLOCK FACE THREE-THIRTY
🕓 U+1F553 CLOCK FACE FOUR OCLOCK
🕟 U+1F55F CLOCK FACE FOUR-THIRTY
🕔 U+1F554 CLOCK FACE FIVE OCLOCK
🕠 U+1F560 CLOCK FACE FIVE-THIRTY
🕕 U+1F555 CLOCK FACE SIX OCLOCK
🕡 U+1F561 CLOCK FACE SIX-THIRTY
🕖 U+1F556 CLOCK FACE SEVEN OCLOCK
🕢 U+1F562 CLOCK FACE SEVEN-THIRTY
🕗 U+1F557 CLOCK FACE EIGHT OCLOCK
🕣 U+1F563 CLOCK FACE EIGHT-THIRTY
🕘 U+1F558 CLOCK FACE NINE OCLOCK
🕤 U+1F564 CLOCK FACE NINE-THIRTY
🕙 U+1F559 CLOCK FACE TEN OCLOCK
🕥 U+1F565 CLOCK FACE TEN-THIRTY
🕚 U+1F55A CLOCK FACE ELEVEN OCLOCK
🕦 U+1F566 CLOCK FACE ELEVEN-THIRTY
🕛 U+1F55B CLOCK FACE TWELVE OCLOCK
🕧 U+1F567 CLOCK FACE TWELVE-THIRTY
🕰 U+1F570 MANTELPIECE CLOCK
🗓 U+1F5D3 SPIRAL CALENDAR PAD
You can copy and paste the characters from this page into most editors.
At unicode-table.com you might find more useful code points.

Chars:
◴◵◶◷
Unicode number:
U+25F4 - U+25F7
HTML code:
◴ - ◷
are working for me

A collection of clock faces has been proposed as part of the new Emoji set, in the range from U+1F550 to U+1F55B. Browser/font support is pretty much completely absent, sadly.
Here's one of the clock faces:
Also proposed is an alarm clock symbol at U+23F0:
More about the Emoji set here.

Maybe ⌛
U+231B HOURGLASS
Check that similar question: What Unicode character do you use in your website? (instead of image icons)

Related

Smart pool swimming tracking

I'm a competitive swimmer and would like more detailed feedback on my swims.
A regular smartwatch has gyro/accererometer/gps/magnetometer, but has a few issues:
Laps aren't being counted instantly, often has some delay after making a turn
There's quite some deviation in lap time measurements, I would like to be able to more accurately measure my lap times in a swim, not with a 2 seconds deviation
When not moving my arms (e.g. swimming legs only), it doesn't count my lap
When taking breaks it does not detect this fast enough.
These are just limitations from the currently used hardware.
One solution is to use a touchpad, which are often used in competition, but when swimming with multiple people in a crowded lane, this doesn't work well either.
I've thought about a solution for this, and a possible solution would be to have a "base-station" at one end of a pool, and somehow measure the distance between the base-station and the swimmer. If you know exactly how far away a swimmer is in the pool, you can more accurately count laps/measure lap times/detect pauses.
Only problem I'm facing now is, what method can I use to measure the distance from the base-station and the swimmer?
Some insight:
Sometimes the swimmer is above the water, other times they're underwater.
Sound-based localization is tricky since sound moves 4x faster in water than in air
Radio-based localization is tricky since the speed of light in water is 75% that of in air. (and radio waves get attenuated fast in water)
Camera with some IR LED or swimming-cap color detection could work but not very convenient
Accuracy needed: ~0.5m
Placement of sensor: can be around wrist, or on head, or somewhere else
Anyone got any tips?

Raspiberry Pi RP2040 LCD clock signals

I'm using Micro python to try and generate an RGB signal for a TFT screen such as the:
Screen
The timings i need the follow are:
CLKIN: 3.33Mhz
Horizontal is 800 clock cycles up and 1 clock cycle down
Vertical is 480 Horizontal Clock cycles up and
Ive already got this code that spits out the clock but i cant chnage the square function or add a second state machine, how would i go about bit bashing the pins at the required times.
from machine import Pin
from rp2 import PIO, StateMachine, asm_pio
import time
#asm_pio(set_init=PIO.OUT_LOW)
def square():
wrap_target()
set(pins, 1)
set(pins, 0)
wrap()
sm = rp2.StateMachine(0, square, freq=33300000, set_base=Pin(2))
sm.active(1)
Your frequency is 3.33mHz, but each cycle uses 2 cpu cycles so each rising edge is only at 1.665mHz.

Planet tilts and rotations.

We are building an Astronomical clock that tracks the planet and moon locations in the Galilain solar system ( planets out to Saturn And moons do earth and 4 moons of Jupiter. Think if an orrery that acuately tracks time.
The clock can move to different epoch and Can move through the 12 astronomical ages. It’s 8ft in diameter, hangs from the ceiling, 24 stepper motors drive the rotations and tilts of the planets, 18.6 year moon cycle etc.
We plan to use PyEphem to identify locations of planets. We need additional data and was wondering if python can provide this data.
We need the rotation and tilt of planet (earth mars Saturn). And we need tie rotation so the part of the planet that faces the sun. Lastly we need to Jupiter’s 4 major moons location over the planet.
Does PyEphem support these addition items and if not is there any advice you can provide us.
W
Details of what PyEphem supports are available from the PyEphem website which provides detailed, searchable documentation.
This is very standard for software libraries. I am not being disingenuous when I advise you to RTFM - this is definitive material. Google and Bing should be your next port of call, especially since you have clearly defined search terms.
Alas, PyEphem does not include any models of planetary rotation, no — so the lack of any mention of it in the documentation is not an omission but the lack of that feature in the underlying libastro library.

RC Filter at the ADC input pins of beagle bone black

I am trying to read a thermistor with the beagle bone black.
I have a voltage divider circuit that feeds a unity gain Opamp. The O/P of the opamp is connected to a simple RC Low pass filter that feeds voltage to the ADC pin.
The problem I have noticed is that the voltage sensed by the beagle bone is always 0.02V higher than the actual voltage at the opamp output.
At first I thought this was a software issue, but on further investigation I found out that the voltage at the ADC pin is actually raised by 0.02V. If I feed the ADC pin directly from the opamp, without the RC filter I do not have this issue.
Has anyone else experienced anything similar?
Thanks in advance!
The resistance in the RC filter is too high which is causing a voltage drop because of the internal impedance of the ADC pin. You can use an active low pass filter to resolve this problem:
http://en.wikipedia.org/wiki/Low-pass_filter#Active_electronic_realization

Guitar Hero Type Metronome

I'm trying to create a guitar hero type game and I'm working on a horizontal metronome where a dot crosses a certain vertical line means to play a note.
The metronome starts when the note is 5 seconds from being played then moves across and finally hits the vertical line. Are there any algorithms for making the dot move at the correct speed so it hits the line in exactly 5 seconds.
Also the image movement is very choppy. Is there any way to smooth the movement of the image across the view?
I would appreciate any feedback, thanks.
High-school physics - velocity = distance / time
Also, you probably don't really want "5 seconds" as your fixed preparation time for every song. 1 or 2 bars (at the song's tempo) would be better.