Content reorg
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|
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|
|
@ -21,7 +21,7 @@ really important so you could dim it down a lot without flickering. I ended up u
|
|||
.. raw:: html
|
||||
|
||||
<figure>
|
||||
<img src="/images/rgb_cube.svg" alt="An illustration of the RGB color cube.">
|
||||
<img src="images/rgb_cube.svg" alt="An illustration of the RGB color cube.">
|
||||
<figcaption>An illustration of the RGB color cube.
|
||||
<a href="https://commons.wikimedia.org/wiki/File:RGB_color_cube.svg">Picture</a> by
|
||||
<a href="https://commons.wikimedia.org/wiki/User:Maklaan">Maklaan from Wikimedia Commons</a>,
|
||||
|
|
@ -48,7 +48,7 @@ transformation.
|
|||
.. raw:: html
|
||||
|
||||
<figure>
|
||||
<img src="/images/hsv_cylinder.png" alt="An illustration of the HSV color space as a cylinder.">
|
||||
<img src="images/hsv_cylinder.png" alt="An illustration of the HSV color space as a cylinder.">
|
||||
<figcaption>An illustration of the HSV color space as a cylinder.
|
||||
<a href="https://commons.wikimedia.org/wiki/File:HSV_color_solid_cylinder.png">Picture</a> by
|
||||
<a href="https://commons.wikimedia.org/wiki/User:SharkD">SharkD from Wikimedia Commons</a>,
|
||||
|
|
@ -70,15 +70,15 @@ particular in the blues and greens we loose *a lot* of colors to sRGB.
|
|||
|
||||
<figure>
|
||||
<video controls loop>
|
||||
<source src="/video/sRGB.mkv" type="video/h264">
|
||||
<source src="/video/sRGB.webm" type="video/webm">
|
||||
<source src="video/sRGB.mkv" type="video/h264">
|
||||
<source src="video/sRGB.webm" type="video/webm">
|
||||
Your browser does not support the HTML5 video tag.
|
||||
</video>
|
||||
<figcaption>Illustration of the measured sRGB color space within XYZ. The thick, white line is the spectral
|
||||
locus.
|
||||
|
||||
<a href="/video/sRGB.mkv">mkv/h264 download</a> /
|
||||
<a href="/video/sRGB.webm">webm download</a>
|
||||
<a href="video/sRGB.mkv">mkv/h264 download</a> /
|
||||
<a href="video/sRGB.webm">webm download</a>
|
||||
</figcaption>
|
||||
</figure>
|
||||
|
||||
|
|
@ -101,13 +101,13 @@ over the problem, there are several sources for imperfections:
|
|||
|
||||
<figure>
|
||||
<figure class="side-by-side">
|
||||
<img src="/images/driver_ringing_strong.jpg" alt="Strong ringing on the LED voltage waveform edge at about
|
||||
<img src="images/driver_ringing_strong.jpg" alt="Strong ringing on the LED voltage waveform edge at about
|
||||
100% overshoot during about 70% of the cycle time.">
|
||||
<figcaption>The shift register logic output of the multichannel LED driver directly driving a small mosfet's
|
||||
gate through an inch or so of PCB trace caused extremely bad ringing at high driving
|
||||
frequencies.</figcaption>
|
||||
</figure><figure class="side-by-side">
|
||||
<img src="/images/driver_ringing_weak.jpg" alt="Weak ringing on the LED voltage waveform edge at about 30%
|
||||
<img src="images/driver_ringing_weak.jpg" alt="Weak ringing on the LED voltage waveform edge at about 30%
|
||||
overshoot during about 20% of the cycle time.">
|
||||
<figcaption>Adding a resistor dampened the ringing somewhat, but ultimately it cannot be eliminated
|
||||
entirely.</figcaption>
|
||||
|
|
@ -163,19 +163,19 @@ spectrum of the phosphor.
|
|||
|
||||
<figure>
|
||||
<figure class="side-by-side">
|
||||
<img src="/images/spectrograph_step1_parts.jpg">
|
||||
<img src="images/spectrograph_step1_parts.jpg">
|
||||
<figcaption>The ingredients. The cup of coffee and Madoka Magica DVD set are essential to the eventual
|
||||
function of the appartus.</figcaption>
|
||||
</figure><figure class="side-by-side">
|
||||
<img src="/images/spectrograph_step2.jpg">
|
||||
<img src="images/spectrograph_step2.jpg">
|
||||
<figcaption>Step 1: Cut to size and mark down all holes as described in <a
|
||||
href="http://www.candac.ca/candacweb/sites/default/files/BuildaSpectroscope.pdf">the manual</a></figcaption>
|
||||
</figure>
|
||||
<figure class="side-by-side">
|
||||
<img src="/images/spectrograph_step3.jpg">
|
||||
<img src="images/spectrograph_step3.jpg">
|
||||
<figcaption>Step 2: Cut out all holes</figcaption>
|
||||
</figure><figure class="side-by-side">
|
||||
<img src="/images/spectrograph_step4_complete.jpg">
|
||||
<img src="images/spectrograph_step4_complete.jpg">
|
||||
<figcaption>The finished result with the back side showing. The viewing window is on the bottom of the other
|
||||
side.</figcaption>
|
||||
</figure>
|
||||
|
|
@ -195,7 +195,7 @@ different colors on their pictures. Some other sensor was needed.
|
|||
.. raw:: html
|
||||
|
||||
<figure>
|
||||
<img src="/images/daylight_spectrum_dvd.jpg">
|
||||
<img src="images/daylight_spectrum_dvd.jpg">
|
||||
<figcaption>The daylight spectrum as seen using a DVD as a grating.
|
||||
<a href="https://commons.wikimedia.org/wiki/File:SpectresSolaires-DVD.jpg">Picture</a> by
|
||||
<a href="https://commons.wikimedia.org/wiki/User:Xofc">Xofc from Wikimedia Commons</a>,
|
||||
|
|
@ -235,7 +235,7 @@ trimpot on the virtual ground both amplifers use as a reference so I could trim
|
|||
.. raw:: html
|
||||
|
||||
<figure>
|
||||
<img src="/images/preamp_schematic.jpg" alt="A drawing of the photodiode preamplifier's schematic">
|
||||
<img src="images/preamp_schematic.jpg" alt="A drawing of the photodiode preamplifier's schematic">
|
||||
<figcaption>The photodiode preamplifier schematic. Schematic drawn with an unlicensed copy of
|
||||
DaveCAD.</figcaption>
|
||||
</figure>
|
||||
|
|
@ -256,10 +256,10 @@ here.
|
|||
|
||||
<figure>
|
||||
<figure class="side-by-side">
|
||||
<img src="/images/preamp_front.jpg">
|
||||
<img src="images/preamp_front.jpg">
|
||||
<figcaption>The front side of the preamplifier board.</figcaption>
|
||||
</figure><figure class="side-by-side">
|
||||
<img src="/images/preamp_back.jpg">
|
||||
<img src="images/preamp_back.jpg">
|
||||
<figcaption>The wiring of the photodiode preamp.</figcaption>
|
||||
</figure>
|
||||
</figure>
|
||||
|
|
@ -289,7 +289,7 @@ The whole unit with photodiode preamplifier, linear stage, photodiode and steppe
|
|||
.. raw:: html
|
||||
|
||||
<figure>
|
||||
<img src="/images/electronics_whole.jpg" alt="The complete electronics setup of the spectrograph. In the back
|
||||
<img src="images/electronics_whole.jpg" alt="The complete electronics setup of the spectrograph. In the back
|
||||
there is the DVD drive stepper stage. In front of it, mounted on a piece of wood are a small USB-to-12V
|
||||
switching-regulator module to power the stepper motor in the top left, below on the bottom left is the
|
||||
photodiode preamp and on the right is a breadboard with the stepper driver module and lots of jumper wires
|
||||
|
|
@ -337,7 +337,7 @@ begin.
|
|||
.. raw:: html
|
||||
|
||||
<figure>
|
||||
<img src="/images/raw_plot_cheap_rgb.svg" alt="A plot with three wide peaks, two large peaks on both sides and
|
||||
<img src="images/raw_plot_cheap_rgb.svg" alt="A plot with three wide peaks, two large peaks on both sides and
|
||||
one smaller one in the middle. The middle one overlaps the two on the sides. The large ones are about 2.5V in
|
||||
amplitude. Overall, the plot is about 300 stepper steps wide with each peak being around 130 steps wide.">
|
||||
<figcaption>A plot of the raw preamp output voltage versus stepper position. From left to right, the three peaks
|
||||
|
|
@ -382,7 +382,7 @@ wavelength in nanometers.
|
|||
.. raw:: html
|
||||
|
||||
<figure>
|
||||
<img src="/images/processed_plot_cheap_rgb.svg" alt="A plot with three wide peaks, all three of different
|
||||
<img src="images/processed_plot_cheap_rgb.svg" alt="A plot with three wide peaks, all three of different
|
||||
heights. The leftmost peak is highest at 6nA, the middle peak lowest at 1.6nA and the rightmost peak in between
|
||||
at 4nA. The middle one overlaps the two on the sides. Overall, the plot spans about 300nm on its x axis with
|
||||
each peak being around 100nm wide.">
|
||||
|
|
@ -418,15 +418,15 @@ models can be found in the `project repo`_.
|
|||
|
||||
<figure>
|
||||
<video controls loop>
|
||||
<source src="/video/led_within_srgb_scale=1.0.mkv" type="video/h264">
|
||||
<source src="/video/led_within_srgb_scale=1.0.webm" type="video/webm">
|
||||
<source src="video/led_within_srgb_scale=1.0.mkv" type="video/h264">
|
||||
<source src="video/led_within_srgb_scale=1.0.webm" type="video/webm">
|
||||
Your browser does not support the HTML5 video tag.
|
||||
</video>
|
||||
<figcaption>Illustration of the measured LED color space scaled to fit within XYZ with sRGB (light gray) for
|
||||
comparison. The thick, white line is the spectral locus.
|
||||
|
||||
<a href="/video/led_within_srgb_scale=1.0.mkv">mkv/h264 download</a> /
|
||||
<a href="/video/led_within_srgb_scale=1.0.webm">webm download</a>
|
||||
<a href="video/led_within_srgb_scale=1.0.mkv">mkv/h264 download</a> /
|
||||
<a href="video/led_within_srgb_scale=1.0.webm">webm download</a>
|
||||
</figcaption>
|
||||
</figure>
|
||||
|
||||
|
|
@ -444,15 +444,15 @@ around with a couple of factors and settled on 2.5 as a reasonable compromise. B
|
|||
|
||||
<figure>
|
||||
<video controls loop>
|
||||
<source src="/video/led_within_srgb_fancy_camera_path_scale=2.5.mkv" type="video/h264">
|
||||
<source src="/video/led_within_srgb_fancy_camera_path_scale=2.5.webm" type="video/webm">
|
||||
<source src="video/led_within_srgb_fancy_camera_path_scale=2.5.mkv" type="video/h264">
|
||||
<source src="video/led_within_srgb_fancy_camera_path_scale=2.5.webm" type="video/webm">
|
||||
Your browser does not support the HTML5 video tag.
|
||||
</video>
|
||||
<figcaption>Illustration of the measured LED color space at scale factor 2.5 within XYZ with sRGB (light gray)
|
||||
for comparison. The thick, white line is the spectral locus.
|
||||
|
||||
<a href="/video/led_within_srgb_fancy_camera_path_scale=2.5.mkv">mkv/h264 download</a> /
|
||||
<a href="/video/led_within_srgb_fancy_camera_path_scale=2.5.webm">webm download</a>
|
||||
<a href="video/led_within_srgb_fancy_camera_path_scale=2.5.mkv">mkv/h264 download</a> /
|
||||
<a href="video/led_within_srgb_fancy_camera_path_scale=2.5.webm">webm download</a>
|
||||
</figcaption>
|
||||
</figure>
|
||||
|
||||
|
|
@ -470,9 +470,9 @@ My implementation of these conversions in the ESP8266 firmware of my `Wifi LED d
|
|||
|
||||
.. _`on Github`: https://github.com/jaseg/esp_led_drv/blob/master/user/led_controller.c
|
||||
.. _`project repo`: https://github.com/jaseg/led_drv
|
||||
.. _`Wifi LED driver`: {{<ref "posts/wifi-led-driver.rst">}}
|
||||
.. _`small driver`: {{<ref "posts/wifi-led-driver.rst">}}
|
||||
.. _`multichannel LED driver`: {{<ref "posts/multichannel-led-driver.rst">}}
|
||||
.. _`Wifi LED driver`: {{<ref "posts/wifi-led-driver/index.rst">}}
|
||||
.. _`small driver`: {{<ref "posts/wifi-led-driver/index.rst">}}
|
||||
.. _`multichannel LED driver`: {{<ref "posts/multichannel-led-driver/index.rst">}}
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.. _`sRGB`: https://en.wikipedia.org/wiki/SRGB
|
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.. _`CC BY-SA 3.0`: https://creativecommons.org/licenses/by-sa/3.0
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.. _`Color spaces`: https://en.wikipedia.org/wiki/Color_space
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@ -1,6 +1,5 @@
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---
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||||
title: "Multichannel Led Driver"
|
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date: 2018-05-02T11:31:14+02:00
|
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draft: true
|
||||
---
|
||||
|
||||
|
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@ -1,6 +1,5 @@
|
|||
---
|
||||
title: "Wifi Led Driver"
|
||||
date: 2018-05-02T11:31:03+02:00
|
||||
draft: true
|
||||
---
|
||||
|
||||
|
|
@ -1,7 +1,6 @@
|
|||
---
|
||||
title: "Zeus Hammer"
|
||||
date: 2018-05-03T11:59:37+02:00
|
||||
draft: true
|
||||
---
|
||||
|
||||
In case you were having an inferiority complex because your friends' IBM Model M keyboards are so much louder than the
|
||||
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