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pcbgreycode [2019/01/06 22:09] – yairpcbgreycode [2019/06/01 11:56] (current) – yair
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-{{  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]]
  
 +{{:video-1547726867.mp4}} {{youtube>em2OpwheHMU?medium}} {{:20190208_151040.mp4|}} {{::turntablepcb-v4-zofzpcb.mp4|using www.zofzpcb.com on archLinux/wine}}
 +{{:v1.3.jpg?400}} {{:50533102_325584924718706_62649425226366976_n.jpg?400}}
  
-===8 BIT turntable===+[[https://github.com/idiot-io/turntablePCB|github]] repository
  
  
-a turntable embedded on a PCB+=== tools used ===
  
-{{youtube>em2OpwheHMU?medium}}+[[https://inkscape.org|inkscape]]\\ 
 +extensions 
 +     *[[https://github.com/badgeek/svg2shenzhen|svg2shenzhen]] 
 +     *[[https://github.com/Hyvok/Inkscape-rotary-encoder-disk-generator|rotary encoder generator]] 
  
-====Layout====+[[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]]
  
-{{https://i.imgur.com/jlaOwRV.png|Honey bee counter II}} +===Layout=== 
 +[[https://www.pololu.com/docs/0J13/2|digital]] \\ 
 +{{:pasted:20190122-211551.png}}
  
-[[http://gunook.com/honigbienenzahler-ii|Honey bee counter II]]+[[https://www.pololu.com/docs/0J13/3|analog]] \\ 
 +{{:pasted:20190601-085501.png}}
  
-====encoding==== 
  
-===gray encoding===+a few guides and approaches
  
-using something like an array of reflective IR sensors+  *[[http://gunook.com/honigbienenzahler-ii|Honey bee counter II]] 
 +  *https://cdn.sparkfun.com/datasheets/Sensors/Infrared/SparkFun%20Line%20Follower%20Array_v10.pdf
  
-{{https://i.imgur.com/KrapStk.png}} 
- 
-**components** 
- 
- 
-  *QRE111 - [[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/4fpaVVj.png}} 
- 
- 
-{{https://i.imgur.com/5jFBp8g.png}} 
- 
-a few approaches on the hookup 
-  *https://cdn.sparkfun.com/datasheets/Sensors/Infrared/SparkFun%20Line%20Follower%20Array_v10.pdf 
-  *https://www.pololu.com/docs/0J13/2 
  
 ===Gray code=== ===Gray code===
 + [[http://en.wikipedia.org/wiki/Gray_code|wikipedia]]\\
  
-a silkscreen on the round PCB bottom to encode the position using [[http://en.wikipedia.org/wiki/Gray_code|gray code]]+<blockquote>{{youtube>IeWcvAsz88o?medium}} 
 +<cite>"to get a gray number only change one bit"</cite> 
 +</blockquote>
  
-  *generator #1 [[http://engineering.olkha.com/gray|online]]  +<blockquote>{{:pasted:20190122-192340.png}} 
-  *generator #2 [[https://github.com/Hyvok/Inkscape-rotary-encoder-disk-generator|inkscape]]+<cite>http://datagenetics.com/blog/november32014/</cite> 
 +</blockquote>
  
-{{youtube>oc5hIxdCMZ0?medium}}+{{:greycode.png}} {{https://i.imgur.com/DbMB6Vvm.png}}
  
-{{youtube>IeWcvAsz88o?medium}} 
  
-https://www.youtube.com/watch?v=JwU<em>DrI</em>Mmc+===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}}
  
-“to get a gray number only change one bit” 
  
-{{https://d2mxuefqeaa7sj.cloudfront.net/s_C3F26DA1DE2735AB305F4004085FAFE353789C4AD8CC62A80295D78BF90BFD02_1531819410575_image.png|https://www.quora.com/What-is-the-difference-between-binary-numbers-and-Grays-code}}+====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]]
  
-{{https://i.imgur.com/DbMB6Vv.png}} +===magnetic=== 
- +[[http://www.ichaus.de/upload/pdf/WP6en_Magnetic_vs_optical_17092012.pdf|Magnetic_vs_optical]]
-https://www.semanticscholar.org/paper/Design-of-absolute-encoder-disk-coding-based-on-n-Paul-Chang+
  
 ===DC motor=== ===DC motor===
- +simply connecting a dc motor to the spinning disk\\ 
-simply connecting a dc motor to the spinning disk +by rotating the disk you convert the energy to analog input for MCU or whatever\\ 
-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.
-problem with this approach it will not give enough output at slow speeds. so probably scratch that.</p>+
  
 ===Stepper motor=== ===Stepper motor===
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 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. 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.
  
-following links are actually to use the sinusoidal wave of the stepper, a bit of a different approach+following links are actually to use the sinusoidal wave of the stepper, a bit of a different approach\\
 also a problem at low speeds.  also a problem at low speeds. 
  
-https://wemakethings.net/2013/02/18/steppers-as-rotary-encoders/+  * [[https://wemakethings.net/2013/02/18/steppers-as-rotary-encoders/|steppers-as-rotary-encoders]] 
 +  * [[http://www.4qdtec.com/stpen.html|stpen]] 
 + 
 + 
  
-http://www.4qdtec.com/stpen.html