Differences

This shows you the differences between two versions of the page.

--- pcbgreycode [2018/11/26 00:55] – yair
+++ pcbgreycode [2019/02/10 22:58] – yair
@@ Line 1: / Line 1: @@
-{{  https://i.imgur.com/LRRg0W9.png}}
+a turntable embedded on a PCB, a silkscreen on a round PCB to encode the position using [[#gray_code]]
-<html>
+{{:video-1547726867.mp4}} {{youtube>em2OpwheHMU?medium}} {{:20190208_151040.mp4|}}
-<h1>8BIT turntable</h1>
-https://i.imgur.com/u1XNz9t.png
-<p>a turntable embedded on a PCB</p>
-<p>https://www.youtube.com/watch?v=em2OpwheHMU&amp;</p>
+{{:v1.3.jpg?400}} {{:50533102_325584924718706_62649425226366976_n.jpg?400}}
-<h2>Layout</h2>
+[[https://github.com/idiot-io/turntablePCB|github]] repository
-<p><img src="https://i.imgur.com/jlaOwRV.png" alt="http://gunook.com/honigbienenzahler-ii/" title="" /></p>
-<h1>encoding</h1>
+=== tools used ===
-<h2>gray encoding</h2>
+[[https://inkscape.org|inkscape]]\\
+extensions
+     *[[https://github.com/badgeek/svg2shenzhen|svg2shenzhen]]
+     *[[https://github.com/Hyvok/Inkscape-rotary-encoder-disk-generator|rotary encoder generator]]
-<p>using something like an array of reflective IR sensors </p>
+[[https://kicad.org|kicad]]
+  *[[https://github.com/idiot-io/turntablePCB/blob/master/board/kicad_gerber_gen.py|python script example to create plot files to build a board]]
-<p><img src="https://i.imgur.com/KrapStk.png" alt="qtr-8" title="" /></p>
+===Layout===
+{{:pasted:20190122-211551.png}}
-<p><strong>components</strong></p>
-<ul>
-<li>QRE111 - <a href="http://www.onsemi.com/pub/Collateral/QRE1113-D.PDF">datasheet</a>, <a href="https://www.aliexpress.com/item/50pcs-lot-QRE1113GR-QRE1113-QRE1113G-SMD4-Original-authentic-and-new-in-stock-Free-Shipping-IC/32841727674.html">aliExp</a>
-<img src="https://i.imgur.com/4fpaVVj.png" alt="QRE111" title="" /></li>
-</ul>
-<p><img src="https://i.imgur.com/5jFBp8g.png" alt="" title="" /></p>
-<p>a few approaches on the hookup
+a few guides and approches
-https://cdn.sparkfun.com/datasheets/Sensors/Infrared/SparkFun%20Line%20Follower%20Array_v10.pdf</p>
+  *https://www.pololu.com/docs/0J13/2
+  *[[http://gunook.com/honigbienenzahler-ii|Honey bee counter II]]
+  *https://cdn.sparkfun.com/datasheets/Sensors/Infrared/SparkFun%20Line%20Follower%20Array_v10.pdf
-<p>https://www.pololu.com/docs/0J13/2</p>
-<h2>Gray code</h2>
+===Gray code===
+ [[http://en.wikipedia.org/wiki/Gray_code|wikipedia]]\\
-<p>a silkscreen on the round PCB bottom to encode the position using <a href="http://en.wikipedia.org/wiki/Gray_code">gray code</a></p>
+<blockquote>{{youtube>IeWcvAsz88o?medium}}
+<cite>"to get a gray number only change one bit"</cite>
+</blockquote>
-<p>generator #1 <a href="http://engineering.olkha.com/gray/">online</a>
+<blockquote>{{:pasted:20190122-192340.png}}
- generator #2 <a href="https://github.com/Hyvok/Inkscape-rotary-encoder-disk-generator">inkscape</a></p>
+<cite>http://datagenetics.com/blog/november32014/</cite>
+</blockquote>
-<p>https://www.youtube.com/watch?v=oc5hIxdCMZ0&amp;</p>
+{{:greycode.png}} {{https://i.imgur.com/DbMB6Vvm.png}}
-<p>https://www.youtube.com/watch?v=JwU<em>DrI</em>Mmc&amp;</p>
-<p>https://www.youtube.com/watch?v=IeWcvAsz88o&amp;</p>
+===components===
+  *QRE1113 - [[http://www.onsemi.com/pub/Collateral/QRE1113-D.PDF|datasheet]], [[https://www.aliexpress.com/item/50pcs-lot-QRE1113GR-QRE1113-QRE1113G-SMD4-Original-authentic-and-new-in-stock-Free-Shipping-IC/32841727674.html|aliExp]]
+{{https://i.imgur.com/oE29h9I.png}} {{https://i.imgur.com/82dWTnM.png}} \\
+{{https://i.imgur.com/4fpaVVjl.png}} {{https://i.imgur.com/5jFBp8gl.png}}
-<p>“to get a gray number only change one bit”</p>
-<p><img src="https://d2mxuefqeaa7sj.cloudfront.net/s_C3F26DA1DE2735AB305F4004085FAFE353789C4AD8CC62A80295D78BF90BFD02_1531819410575_image.png" alt="https://www.quora.com/What-is-the-difference-between-binary-numbers-and-Grays-code" title="" /></p>
+====other methods====
+the following are for reference
+===LED as light Sensor===
+no word regarding detection speed
+  *[[https://wiki.analog.com/university/courses/electronics/electronics-lab-led-sensor|analog.com]]
+  *[[https://makezine.com/projects/make-36-boards/how-to-use-leds-to-detect-light/|makezine]]
-<p><img src="https://i.imgur.com/DbMB6Vv.png" alt="https://www.semanticscholar.org/paper/Design-of-absolute-encoder-disk-coding-based-on-n-Paul-Chang/" title="" /></p>
+===magnetic===
+[[http://www.ichaus.de/upload/pdf/WP6en_Magnetic_vs_optical_17092012.pdf|Magnetic_vs_optical]]
-<h2>DC motor</h2>
+===DC motor===
+simply connecting a dc motor to the spinning disk\\
+by rotating the disk you convert the energy to analog input for MCU or whatever\\
+problem with this approach it will not give enough output at slow speeds. so probably scratch that.
-<p>simply connecting a dc motor to the spining disk
+===Stepper motor===
-by rotating the disk you convert the enregy to analog input for MCU or whatever
-problem with this approach it will not give enough output at slow speeds. so probably scratch that.</p>
-<h2>Stepper motor</h2>
+same as with the DC motor, you connect the motor to the disks center, then hook the stepper winding A1/2,B1/2 to an MCU, you get a nice stepping encoder.
-<p>same as with the DC motor, you connect the motor to the disks center, then hook the stepper winding A1/2,B1/2 to an MCU, you get a nice stepping encoder. </p>
+following links are actually to use the sinusoidal wave of the stepper, a bit of a different approach\\
-<p>following links are actually to use the sinusoidal wave of the stepper, a bit of a different approach
 also a problem at low speeds.
-https://wemakethings.net/2013/02/18/steppers-as-rotary-encoders/
-http://www.4qdtec.com/stpen.html</p>
+  * [[https://wemakethings.net/2013/02/18/steppers-as-rotary-encoders/|steppers-as-rotary-encoders]]
-</html>
+  * [[http://www.4qdtec.com/stpen.html|stpen]]