Techinc Wheel

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Projects
20130729-techinc-wheel-at-ohm.jpeg
Participants Narya
Skills Electronics, Mechanics
Status Finished
Niche Electronics
Purpose Promotion

Bringing the wheel to events

If you can't reach Narya or Mariejel, assume a "yes" when you (a techinc member) want to bring the wheel to an event. Please put it back on the wall when the event is over. If the LEDs come loose you can simply put it back with double-sided tape and/or ductape.

Summary

  • The wooden techinc wheel has a WS2801 LED strip stuck on the back and is controlled via an Arduino Nano esp8266 with ESPHome
  • The 8 strips consist of 5 pixels each (3 LEDs per pixel). The first "spoke" goes outwards, the second inwards, the third outwards, etc
  • The data pin is GPIO4 and the clock pin GPIO2
  • Color order is BRG, which is supported by the FastLED library, but for other libraries you need to put the colors in the right order
  • The Wheel is on wifi, as 'ti-wheel.local'
  • The wheel is connected to our HomeAssistant instance on 'https://spass.techinc.nl': device light.techinc_wheel
  • The old arduino which ran the wheel before is included in the original enclosure that now (also) houses the ESP8266, in case a revert is ever needed.

Feel free to add/suggest extra code to the ESPhome settup, add sensors or whatever.

MOVING PICTURES

The wheel is not connected to Powerbars

Old Code

Currently the ColorPalette code runs on the Arduino.

Arduino code - work in progress

Things to make and do

This project has several parts: backlit the wheel, mount the wheel to the wall or on some stand, and make the wheel control something. It would be nice to be able to unmount the wheel and take it somewhere else, e.g. to display it at events.

Mount

Who: justa, narya, control-k

  • Location: on the wall - done
  • Location: infront of the window - Done
wheel when it was mounted on the wall

Painting

  • NO color painting!
  • Scratched parts could eventually be fixed with varnish

Backlit

Who: Narya, Brainsmoke and Mariejel

Who, later: Justa who moved it to ESPHome

Soldering: done

WS2801 12V magic strip

  • 12V
  • 40 addressable pixels, color profile BRG
  • Wires: green 12V (not attached), blue clock (pin 11 GPIO02), red data (pin 12 GPIO04), black GND (pin GND)

Color patterns

  • Make a few color patterns:
    • No rotation: colors of logo
    • From center to outside and vice versa (knight rider)
    • Rainbow glow - Done
    • Rotating colors - Done
    • FIRE - Done
    • Twinkle - Done

Sensors

  • Color sensor to change knight rider color for example
  • Distance sensor: change color and/or speed. If hand is within 4cm it can function as a switch (switch between color programs)

Software


Old

Techinc_Wheel/Old

Current code

esphome:
 name: ti-wheel
 platform: ESP8266
 board: esp12e
 on_boot:
   priority: 600
   then:
     light.turn_on:
       id: 'ti_wheel'
       effect: 'Rainbow'    
# Enable logging
logger:
# Enable Home Assistant API
api:
 password: "xxxx"
 reboot_timeout: 0s
ota:
 password: "xxxx"
wifi:
 ssid: "xxxx"
 password: "xxxx"
 # Enable fallback hotspot (captive portal) in case wifi connection fails
 ap:
   ssid: "xxxx"
   password: "xxxx"
captive_portal:
web_server:
  port: 80
  auth:
       username: xxxx
       password: xxxx
light:
 - platform: fastled_spi
   name: "Techinc Wheel"
   id: "ti_wheel"
   chipset: WS2801
   data_pin: GPIO4
   clock_pin: GPIO2
   num_leds: 40
   rgb_order: BRG
   effects:
           - addressable_rainbow:
                   name: Rainbow
                   speed: 10
                   width: 40
           - strobe:
               name: Strobe1
               colors:
               - state: true
                 brightness: 100%
                 red: 100%
                 green: 90%
                 blue: 0%
                 duration: 500ms
               - state: false
                 duration: 250ms
               - state: true
                 brightness: 100%
                 red: 0%
                 green: 100%
                 blue: 0%
                 duration: 500ms
           - addressable_twinkle:
               name: Twinkle
               twinkle_probability: 5%
               progress_interval: 4ms
           - addressable_lambda:
               name: "Fire"
               update_interval: 15ms
               lambda: |-
                 int Cooling = 55;
                 int Sparking = 110;
                 // Adjust size of array to length of pixels
                 static byte heat[40];
                 int cooldown;
             
                 // Step 1.  Cool down every cell a little
                 for( int i = 0; i < it.size(); i++) {
                   cooldown = random(0, ((Cooling * 10) / it.size()) + 2);
             
                   if(cooldown>heat[i]) {
                     heat[i]=0;
                   } else {
                     heat[i]=heat[i]-cooldown;
                   }
                 }
           
                 // Step 2.  Heat from each cell drifts 'up' and diffuses a little
                 for( int k= it.size() - 1; k >= 2; k--) {
                   heat[k] = (heat[k - 1] + heat[k - 2] + heat[k - 2]) / 3;
                 }
           
                 // Step 3.  Randomly ignite new 'sparks' near the bottom
                 if( random(255) < Sparking ) {
                   int y = random(7);
                   heat[y] = heat[y] + random(160,255);
                 }
           
                 // Step 4.  Convert heat to LED colors
                 for( int Pixel = 0; Pixel < it.size(); Pixel++) {
                   // Scale 'heat' down from 0-255 to 0-191
                   byte t192 = round((heat[Pixel]/255.0)*191);
            
                   // calculate ramp up from
                   byte heatramp = t192 & 0x3F; // 0..63
                   heatramp <<= 2; // scale up to 0..252
            
                   // figure out which third of the spectrum we're in:
                   //this is where you can reverse the effect by switching the commented out lines in all 3 places.
                   if( t192 > 0x80) {                     // hottest
                     //it[it.size() - Pixel - 1] = ESPColor(255, 255, heatramp);
                     it[Pixel] = ESPColor(255, 255, heatramp);
                   } else if( t192 > 0x40 ) {             // middle
                     //it[it.size() - Pixel - 1] = ESPColor(255, heatramp, 0);
                     it[Pixel] = ESPColor(255, heatramp, 0);
                   } else {                               // coolest
                     //it[it.size() - Pixel - 1] = ESPColor(heatramp, 0, 0);
                     it[Pixel] = ESPColor(heatramp, 0, 0);
                   }
                 }

Old Arduino inmplementation

#include <SPI.h> 

void setup()
{
    SPI.begin();
    SPI.setBitOrder(MSBFIRST);
    SPI.setDataMode(SPI_MODE0);
    SPI.setClockDivider(SPI_CLOCK_DIV8);
}

uint8_t fade[] =
{
//[ int(((.5-cos(2*pi*x/240.)*.5)**2.2)*255) for x in range(240) ]
   
 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1,1,1,1,2,2,2,3,3,4,4,5,6,7,7,8,9,10,12,13,14,16,17,19,20,22,24,26,28,30,33,35,38,40,43,46,49,52,55,58,62,65,69,72,76,80,84,88,92,96,100,104,108,113,117,121,126,130,135,139,144,148,153,157,162,166,171,175,179,184,188,192,196,200,204,208,211,215,218,222,225,228,231,234,236,239,241,243,245,247,248,250,251,252,253,254,254,254,255,254,254,254,253,252,251,250,248,247,245,243,241,239,236,234,231,228,225,222,218,215,211,208,204,200,196,192,188,184,179,175,171,166,162,157,153,148,144,139,135,130,126,121,117,113,108,104,100,96,92,88,84,80,76,72,69,65,62,58,55,52,49,46,43,40,38,35,33,30,28,26,24,22,20,19,17,16,14,13,12,10,9,8,7,7,6,5,4,4,3,3,2,2,2,1,1,1,1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0
};
 
uint8_t r=0,g=80,b=160;

void loop()
{
   for(;;)
   {
       r+=1;g+=1;b+=1;

       for (i=0; i<40; i++)
       {   
           r+=6;g+=6;b+=6;
           if (r >= 240) r-= 240;
           if (g >= 240) g-= 240;
           if (b >= 240) b-= 240;

           SPI.transfer(fade[r]);
           SPI.transfer(fade[g]);
           SPI.transfer(fade[b]);

       }
       delay(20);
   }
}