post drafts

collections/projects/Arduino-Libraries/_posts/2022-12-27-basic-calculus.md

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+---
+layout: post
+title: "Real time Calculus functions"
+---
+
+# BasicCalculus
+Simple library to _approximate 1-dimensional calculus operations_ in real time. It uses an _alpha-beta filter_ to __smoothen__ and numerically __differentiate__ a variable. The library can also __integrate__ the variable should one choose to. Note the library relies on polling to provide a continuously changing variable to refresh the calculus operations.
+
+![image](http://hyperphysics.phy-astr.gsu.edu/hbase/Math/immath/derint.png)
+
+# Other
+For the sake of simplicity and to reduce memory use, the library uses micros() to update the timestep. This step is shared by all instances of alpha-beta filter.
+
+# References:
+- [Alpha-beta filter](https://en.wikipedia.org/wiki/Alpha_beta_filter)
+- [Derivatives and Integrals](http://hyperphysics.phy-astr.gsu.edu/hbase/Math/derint.html)
+- [Trapezoidal rule](https://en.wikipedia.org/wiki/Trapezoidal_rule)
+
+# Code
+https://github.com/RCmags/basicCalculus

collections/projects/Arduino-Libraries/_posts/2022-12-28-pulse-input.md

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+---
+layout: post
+title: "Detect the pulse width of signals with interrupts"
+---
+
+# PulseInput
+This is a simple library for an interrupt based, non-blocking alternative to Arduino's [pulseIn](https://reference.arduino.cc/reference/cs/language/functions/advanced-io/pulsein/) function. Since it uses interrupts to measure signals, one can read multiple signals without fear of delays in the main loop.  
+
+# How it works
+A pin change interrupt is used to detect when a signal is rising or falling, and the _on-time_ of the signal is measured in microseconds. As such, this library is only suited to decode PWM-like signals, where the time of the pulse-width (on-time) determines the value of the signal.
+
+![image](diagram.png)
+
+# Dependencies
+This library depends on the [PinChangeInterrupt](https://github.com/NicoHood/PinChangeInterrupt) library, so it works with standard Arduinos (Uno, Nano, Mega, etc) and the digiSpark ATTinys boards. Please see the documentation of PinChangeInterrupt to see if your board is supported.
+
+# Code
+https://github.com/RCmags/pulseInput

collections/travel/Brazil/_posts/2023-07-11-first-time-rio-3.md

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+---
+layout: post
+title: "A closer look of downtown Rio de Janeiro and visiting Copacabana"
+
+# image sliders:
+
+slider1-1:
+- url: /img/travel/brazil/rio-de-janeiro/day-3/img1.JPG
+- url: /img/travel/brazil/rio-de-janeiro/day-3/img2.JPG
+- url: /img/travel/brazil/rio-de-janeiro/day-3/img3.JPG
+- url: /img/travel/brazil/rio-de-janeiro/day-3/img4.JPG
+- url: /img/travel/brazil/rio-de-janeiro/day-3/img5.JPG
+- url: /img/travel/brazil/rio-de-janeiro/day-3/img6.JPG
+- url: /img/travel/brazil/rio-de-janeiro/day-3/img7.JPG
+- url: /img/travel/brazil/rio-de-janeiro/day-3/img8.JPG
+- url: /img/travel/brazil/rio-de-janeiro/day-3/img9.JPG
+- url: /img/travel/brazil/rio-de-janeiro/day-3/img10.JPG
+- url: /img/travel/brazil/rio-de-janeiro/day-3/img11.JPG
+- url: /img/travel/brazil/rio-de-janeiro/day-3/img12.JPG
+
+slider1-1b:
+- url: /img/travel/brazil/rio-de-janeiro/day-3/img13.JPG
+- url: /img/travel/brazil/rio-de-janeiro/day-3/img14.JPG
+- url: /img/travel/brazil/rio-de-janeiro/day-3/img15.JPG
+- url: /img/travel/brazil/rio-de-janeiro/day-3/img16.JPG
+- url: /img/travel/brazil/rio-de-janeiro/day-3/img17.JPG
+- url: /img/travel/brazil/rio-de-janeiro/day-3/img18.JPG
+- url: /img/travel/brazil/rio-de-janeiro/day-3/img19.JPG
+- url: /img/travel/brazil/rio-de-janeiro/day-3/img20.JPG
+- url: /img/travel/brazil/rio-de-janeiro/day-3/img21.JPG
+- url: /img/travel/brazil/rio-de-janeiro/day-3/img22.JPG
+- url: /img/travel/brazil/rio-de-janeiro/day-3/img23.JPG
+
+slider1-2:
+- url: /img/travel/brazil/rio-de-janeiro/day-3/img24.JPG
+- url: /img/travel/brazil/rio-de-janeiro/day-3/img25.JPG
+- url: /img/travel/brazil/rio-de-janeiro/day-3/img26.JPG
+- url: /img/travel/brazil/rio-de-janeiro/day-3/img27.JPG
+- url: /img/travel/brazil/rio-de-janeiro/day-3/img28.JPG
+- url: /img/travel/brazil/rio-de-janeiro/day-3/img29.JPG
+- url: /img/travel/brazil/rio-de-janeiro/day-3/img30.JPG
+- url: /img/travel/brazil/rio-de-janeiro/day-3/img31.JPG
+- url: /img/travel/brazil/rio-de-janeiro/day-3/img32.JPG
+- url: /img/travel/brazil/rio-de-janeiro/day-3/img33.JPG
+- url: /img/travel/brazil/rio-de-janeiro/day-3/img34.JPG
+- url: /img/travel/brazil/rio-de-janeiro/day-3/img35.JPG
+
+slider1-3:
+- url: /img/travel/brazil/rio-de-janeiro/day-3/img36.JPG
+- url: /img/travel/brazil/rio-de-janeiro/day-3/img37.JPG
+- url: /img/travel/brazil/rio-de-janeiro/day-3/img38.JPG
+- url: /img/travel/brazil/rio-de-janeiro/day-3/img39.JPG
+- url: /img/travel/brazil/rio-de-janeiro/day-3/img40.JPG
+- url: /img/travel/brazil/rio-de-janeiro/day-3/img41.JPG
+- url: /img/travel/brazil/rio-de-janeiro/day-3/img42.JPG
+- url: /img/travel/brazil/rio-de-janeiro/day-3/img43.JPG
+- url: /img/travel/brazil/rio-de-janeiro/day-3/img44.JPG
+- url: /img/travel/brazil/rio-de-janeiro/day-3/img45.JPG
+- url: /img/travel/brazil/rio-de-janeiro/day-3/img46.JPG
+- url: /img/travel/brazil/rio-de-janeiro/day-3/img47.JPG
+- url: /img/travel/brazil/rio-de-janeiro/day-3/img48.JPG
+- url: /img/travel/brazil/rio-de-janeiro/day-3/img49.JPG
+- url: /img/travel/brazil/rio-de-janeiro/day-3/img50.JPG
+
+slider1-4:
+- url: /img/travel/brazil/rio-de-janeiro/day-3/img51.JPG
+- url: /img/travel/brazil/rio-de-janeiro/day-3/img52.JPG
+- url: /img/travel/brazil/rio-de-janeiro/day-3/img53.JPG
+- url: /img/travel/brazil/rio-de-janeiro/day-3/img54.JPG
+- url: /img/travel/brazil/rio-de-janeiro/day-3/img55.JPG
+- url: /img/travel/brazil/rio-de-janeiro/day-3/img56.JPG
+- url: /img/travel/brazil/rio-de-janeiro/day-3/img57.JPG
+- url: /img/travel/brazil/rio-de-janeiro/day-3/img58.JPG
+- url: /img/travel/brazil/rio-de-janeiro/day-3/img59.JPG
+- url: /img/travel/brazil/rio-de-janeiro/day-3/img60.JPG
+- url: /img/travel/brazil/rio-de-janeiro/day-3/img61.JPG
+- url: /img/travel/brazil/rio-de-janeiro/day-3/img62.JPG
+- url: /img/travel/brazil/rio-de-janeiro/day-3/img63.JPG
+- url: /img/travel/brazil/rio-de-janeiro/day-3/img64.JPG
+- url: /img/travel/brazil/rio-de-janeiro/day-3/img65.JPG
+- url: /img/travel/brazil/rio-de-janeiro/day-3/img66.JPG
+- url: /img/travel/brazil/rio-de-janeiro/day-3/img67.JPG
+
+slider1-5:
+- url: /img/travel/brazil/rio-de-janeiro/day-3/img68.JPG
+- url: /img/travel/brazil/rio-de-janeiro/day-3/img69.JPG
+- url: /img/travel/brazil/rio-de-janeiro/day-3/img70.JPG
+- url: /img/travel/brazil/rio-de-janeiro/day-3/img71.JPG
+
+slider2:
+- url: /img/travel/brazil/rio-de-janeiro/day-3/img72.JPG
+- url: /img/travel/brazil/rio-de-janeiro/day-3/img73.JPG
+- url: /img/travel/brazil/rio-de-janeiro/day-3/img74.JPG
+
+slider2b:
+- url: /img/travel/brazil/rio-de-janeiro/day-3/img75.JPG
+- url: /img/travel/brazil/rio-de-janeiro/day-3/img76.JPG
+- url: /img/travel/brazil/rio-de-janeiro/day-3/img77.JPG
+
+slider3:
+- url: /img/travel/brazil/rio-de-janeiro/day-3/img78.JPG
+- url: /img/travel/brazil/rio-de-janeiro/day-3/img79.JPG
+- url: /img/travel/brazil/rio-de-janeiro/day-3/img80.JPG
+- url: /img/travel/brazil/rio-de-janeiro/day-3/img81.JPG
+- url: /img/travel/brazil/rio-de-janeiro/day-3/img82.JPG
+- url: /img/travel/brazil/rio-de-janeiro/day-3/img83.JPG
+- url: /img/travel/brazil/rio-de-janeiro/day-3/img84.JPG
+- url: /img/travel/brazil/rio-de-janeiro/day-3/img85.JPG
+- url: /img/travel/brazil/rio-de-janeiro/day-3/img86.JPG
+
+---
+
+{% include image-slider.html list=page.slider1-1 local='yes' aspect_ratio="16/9" %}
+<p align="center"><i>Downtown area with older-style government buildings</i></p>
+
+{% include image-slider.html list=page.slider1-1b local='yes' aspect_ratio="16/9" %}
+<p align="center"><i>More views of the highly decorated buildings</i></p>
+
+{% include image-slider.html list=page.slider1-2 local='yes' aspect_ratio="16/9" %}
+<p align="center"><i>Suddenly surrounded by high-rise buildings</i></p>
+
+{% include image-slider.html list=page.slider1-3 local='yes' aspect_ratio="16/9" %}
+<p align="center"><i>The modern buildings have way to a mix of new and old, and some parks</i></p>
+
+{% include image-slider.html list=page.slider1-4 local='yes' aspect_ratio="16/9" %}
+<p align="center"><i></i>The streets became wider, with modern buildings surrounded by parks</p>
+
+{% include image-slider.html list=page.slider1-5 local='yes' aspect_ratio="16/9" %}
+<p align="center"><i>Well-kept antique buildings appeared once more</i></p>
+
+{% include image-slider.html list=page.slider2 local='yes' aspect_ratio="16/9" %}
+<p align="center"><i>Small and relaxing beach by the avenue heading towards Copacabana</i></p>
+
+{% include image-slider.html list=page.slider2b local='yes' aspect_ratio="16/9" %}
+<p align="center"><i>Very tasty fried meatpies filled with ground beef</i></p>
+
+{% include image-slider.html list=page.slider3 local='yes' aspect_ratio="16/9" %}
+<p align="center"><i>Copacabana was not super-packed with tourists despite the renown. Felt very relaxed</i></p>

collections/travel/Brazil/_posts/2023-07-12-first-time-rio-4.md

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+---
+layout: post
+title: "More wandering about downtown Rio. A beautiful mix of modern and historic"
+
+# image sliders:
+
+slider1:
+- url: /img/travel/brazil/rio-de-janeiro/day-4/img1.JPG
+- url: /img/travel/brazil/rio-de-janeiro/day-4/img2.JPG
+- url: /img/travel/brazil/rio-de-janeiro/day-4/img3.JPG
+- url: /img/travel/brazil/rio-de-janeiro/day-4/img4.JPG
+- url: /img/travel/brazil/rio-de-janeiro/day-4/img5.JPG
+
+slider2:
+- url: /img/travel/brazil/rio-de-janeiro/day-4/img6.JPG
+- url: /img/travel/brazil/rio-de-janeiro/day-4/img7.JPG
+- url: /img/travel/brazil/rio-de-janeiro/day-4/img8.JPG
+- url: /img/travel/brazil/rio-de-janeiro/day-4/img9.JPG
+- url: /img/travel/brazil/rio-de-janeiro/day-4/img10.JPG
+- url: /img/travel/brazil/rio-de-janeiro/day-4/img11.JPG
+- url: /img/travel/brazil/rio-de-janeiro/day-4/img12.JPG
+- url: /img/travel/brazil/rio-de-janeiro/day-4/img13.JPG
+
+slider3:
+- url: /img/travel/brazil/rio-de-janeiro/day-4/img14.JPG
+- url: /img/travel/brazil/rio-de-janeiro/day-4/img15.JPG
+- url: /img/travel/brazil/rio-de-janeiro/day-4/img16.JPG
+- url: /img/travel/brazil/rio-de-janeiro/day-4/img17.JPG
+- url: /img/travel/brazil/rio-de-janeiro/day-4/img18.JPG
+- url: /img/travel/brazil/rio-de-janeiro/day-4/img19.JPG
+
+slider4:
+- url: /img/travel/brazil/rio-de-janeiro/day-4/img20.JPG
+- url: /img/travel/brazil/rio-de-janeiro/day-4/img21.JPG
+- url: /img/travel/brazil/rio-de-janeiro/day-4/img22.JPG
+- url: /img/travel/brazil/rio-de-janeiro/day-4/img23.JPG
+- url: /img/travel/brazil/rio-de-janeiro/day-4/img24.JPG
+- url: /img/travel/brazil/rio-de-janeiro/day-4/img25.JPG
+- url: /img/travel/brazil/rio-de-janeiro/day-4/img26.JPG
+- url: /img/travel/brazil/rio-de-janeiro/day-4/img27.JPG
+- url: /img/travel/brazil/rio-de-janeiro/day-4/img28.JPG
+- url: /img/travel/brazil/rio-de-janeiro/day-4/img29.JPG
+- url: /img/travel/brazil/rio-de-janeiro/day-4/img30.JPG
+- url: /img/travel/brazil/rio-de-janeiro/day-4/img31.JPG
+- url: /img/travel/brazil/rio-de-janeiro/day-4/img32.JPG
+- url: /img/travel/brazil/rio-de-janeiro/day-4/img33.JPG
+
+slider5:
+- url: /img/travel/brazil/rio-de-janeiro/day-4/img34.JPG
+- url: /img/travel/brazil/rio-de-janeiro/day-4/img35.JPG
+- url: /img/travel/brazil/rio-de-janeiro/day-4/img36.JPG
+
+slider6:
+- url: /img/travel/brazil/rio-de-janeiro/day-4/img37.JPG
+- url: /img/travel/brazil/rio-de-janeiro/day-4/img38.JPG
+- url: /img/travel/brazil/rio-de-janeiro/day-4/img39.JPG
+- url: /img/travel/brazil/rio-de-janeiro/day-4/img40.JPG
+- url: /img/travel/brazil/rio-de-janeiro/day-4/img41.JPG
+- url: /img/travel/brazil/rio-de-janeiro/day-4/img42.JPG
+- url: /img/travel/brazil/rio-de-janeiro/day-4/img43.JPG
+- url: /img/travel/brazil/rio-de-janeiro/day-4/img44.JPG
+- url: /img/travel/brazil/rio-de-janeiro/day-4/img45.JPG
+
+slider7:
+- url: /img/travel/brazil/rio-de-janeiro/day-4/img46.JPG
+- url: /img/travel/brazil/rio-de-janeiro/day-4/img47.JPG
+- url: /img/travel/brazil/rio-de-janeiro/day-4/img48.JPG
+- url: /img/travel/brazil/rio-de-janeiro/day-4/img49.JPG
+- url: /img/travel/brazil/rio-de-janeiro/day-4/img55.JPG
+
+slider8:
+- url: /img/travel/brazil/rio-de-janeiro/day-4/img50.JPG
+- url: /img/travel/brazil/rio-de-janeiro/day-4/img51.JPG
+- url: /img/travel/brazil/rio-de-janeiro/day-4/img52.JPG
+- url: /img/travel/brazil/rio-de-janeiro/day-4/img53.JPG
+---
+
+{% include image-slider.html list=page.slider1 local='yes' aspect_ratio="16/9" %}
+<p align="center"><i>We walked along the avenue with the bus station</i></p>
+
+{% include image-slider.html list=page.slider2 local='yes' aspect_ratio="16/9" %}
+<p align="center"><i>Along the way we found a modern light-weight train</i></p>
+
+{% include image-slider.html list=page.slider3 local='yes' aspect_ratio="16/9" %}
+<p align="center"><i>We encountered a dense commerial area with antique buildings</i></p>
+
+{% include image-slider.html list=page.slider4 local='yes' aspect_ratio="16/9" %}
+<p align="center"><i>The train led us to a beautiful cathedral amongst modern buildings</i></p>
+
+{% include image-slider.html list=page.slider5 local='yes' aspect_ratio="16/9" %}
+<p align="center"><i></i>The avenue ended at a large park next to the sea</p>
+
+{% include image-slider.html list=page.slider6 local='yes' aspect_ratio="16/9" %}
+<p align="center"><i>We found a museum of the Brazilian navy</i></p>
+
+{% include image-slider.html list=page.slider7 local='yes' aspect_ratio="16/9" %}
+<p align="center"><i>There we many modern buildings next to the park</i></p>
+
+![image](/img/travel/brazil/rio-de-janeiro/day-4/img54.JPG)
+<p align="center"><i>Statue of Joao IV of Brazil</i></p>
+[Joao IV - King of Brazil](https://en.wikipedia.org/wiki/John_VI_of_Portugal#Controversies
+)
+
+{% include image-slider.html list=page.slider8 local='yes' aspect_ratio="16/9" %}
+<p align="center"><i>We could see the beautiful bar from the park</i></p>
+
+![image](https://www.viajenaviagem.com/wp-content/uploads/2016/01/museu-do-amanha-36.jpg)
+[Museo do Amanha](https://museudoamanha.org.br/en)

collections/travel/Brazil/_posts/2023-07-13-first-time-rio-5.md

@@ -0,0 +1,62 @@
+---
+layout: post
+title: "Visiting the Federal University of Rio de Janeiro"
+
+# image sliders:
+
+slider1:
+- url: /img/travel/brazil/rio-de-janeiro/day-5/img1.JPG
+- url: /img/travel/brazil/rio-de-janeiro/day-5/img2.JPG
+- url: /img/travel/brazil/rio-de-janeiro/day-5/img3.JPG
+- url: /img/travel/brazil/rio-de-janeiro/day-5/img4.JPG
+- url: /img/travel/brazil/rio-de-janeiro/day-5/img11.JPG
+- url: /img/travel/brazil/rio-de-janeiro/day-5/img12.JPG
+- url: /img/travel/brazil/rio-de-janeiro/day-5/img13.JPG
+
+slider2:
+- url: /img/travel/brazil/rio-de-janeiro/day-5/img5.JPG
+- url: /img/travel/brazil/rio-de-janeiro/day-5/img6.JPG
+- url: /img/travel/brazil/rio-de-janeiro/day-5/img7.JPG
+- url: /img/travel/brazil/rio-de-janeiro/day-5/img8.JPG
+- url: /img/travel/brazil/rio-de-janeiro/day-5/img9.JPG
+- url: /img/travel/brazil/rio-de-janeiro/day-5/img10.JPG
+
+slider3:
+- url: /img/travel/brazil/rio-de-janeiro/day-5/img14.JPG
+- url: /img/travel/brazil/rio-de-janeiro/day-5/img15.JPG
+- url: /img/travel/brazil/rio-de-janeiro/day-5/img16.JPG
+- url: /img/travel/brazil/rio-de-janeiro/day-5/img17.JPG
+- url: /img/travel/brazil/rio-de-janeiro/day-5/img18.JPG
+
+slider4:
+- url: /img/travel/brazil/rio-de-janeiro/day-5/img19.JPG
+- url: /img/travel/brazil/rio-de-janeiro/day-5/img20.JPG
+- url: /img/travel/brazil/rio-de-janeiro/day-5/img21.JPG
+- url: /img/travel/brazil/rio-de-janeiro/day-5/img22.JPG
+
+slider5:
+- url: /img/travel/brazil/rio-de-janeiro/day-5/img23.JPG
+- url: /img/travel/brazil/rio-de-janeiro/day-5/img24.JPG
+- url: /img/travel/brazil/rio-de-janeiro/day-5/img25.JPG
+- url: /img/travel/brazil/rio-de-janeiro/day-5/img26.JPG
+- url: /img/travel/brazil/rio-de-janeiro/day-5/img27.JPG
+- url: /img/travel/brazil/rio-de-janeiro/day-5/img28.JPG
+- url: /img/travel/brazil/rio-de-janeiro/day-5/img29.JPG
+- url: /img/travel/brazil/rio-de-janeiro/day-5/img30.JPG
+
+---
+
+{% include image-slider.html list=page.slider1 local='yes' aspect_ratio="16/9" %}
+<p align="center"><i>The campus was very green and had a low-key vibe</i></p>
+
+{% include image-slider.html list=page.slider2 local='yes' aspect_ratio="16/9" %}
+<p align="center"><i>Test plaform of a magnetic levitation train built on campus</i></p>
+
+{% include image-slider.html list=page.slider3 local='yes' aspect_ratio="16/9" %}
+<p align="center"><i>We passed through the industrial side of Rio via a highway</i></p>
+
+{% include image-slider.html list=page.slider4 local='yes' aspect_ratio="16/9" %}
+<p align="center"><i>We tried to go to a large ecological park near the beach</i></p>
+
+{% include image-slider.html list=page.slider5 local='yes' aspect_ratio="16/9" %}
+<p align="center"><i>Copacabana was very calm at sunset</i></p>

tools/repeated-string.txt

@@ -0,0 +1,30 @@
+- url: /img/travel/brazil/rio-de-janeiro/day-5/img1.JPG
+- url: /img/travel/brazil/rio-de-janeiro/day-5/img2.JPG
+- url: /img/travel/brazil/rio-de-janeiro/day-5/img3.JPG
+- url: /img/travel/brazil/rio-de-janeiro/day-5/img4.JPG
+- url: /img/travel/brazil/rio-de-janeiro/day-5/img5.JPG
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