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CR30 Neopixels

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adelyser edited this page Aug 28, 2021 · 1 revision

This modification add neopixel support to the stock CR-30 4.2.10 board. This will work with both Marlin and Klipper.

You will need:

  1. A strip of neopixels, I used WS2812B 144/M pixel strip.
  2. A 5V buck converter capable of at least 3amps.
  3. A JST-XHP 3-pin connector and one male pin.
  4. A few ring terminal crip connectors.
  5. 2-3' of 18AWG or 20AWG wire.
  6. The printed mount for the neopixel strip CR-30 Neopixel mount
  7. EITHER the ability to solder to the neopixels OR buy a neopixel strip with the connector already attached.

Summary of how this mod works

  • The pin needed (PA7) to control RGB neopixel strips is already in use by the Y optical endstop. This pin needs to be moved to the unused pin (PA15) in the unused AUX connector.
  • The connector cannot just be moved from Optical to Aux, as Optical is 5V and Aux is 3.3V.
  • Add a new 3-pin connector for Aux, with just the 1 pin removed from the Optical plug inserted into this connector.
  • Wire up the signal pin for the Neopixel strip to the pin in the Optical connector we removed.
  • Wire up the buck converter to power the neopixels separately from the mainboard.
  • Adjust the firmware to enable neopixel control and move the pin for the optical endstop.

Hardware modification

Steps:

  1. Unplug the Optical plug from the mainboard and remove the pin closest to the edge of the board.
  2. Insert the pin removed in step 1 into the new connector, in the same pin location (closest to the edge of the board).
  3. Crimp a new pin on the end of a new wire (24 AWG is fine) and insert it into the Optical plug.
  4. Plug the Optical plug back into it's original location.
  5. Plug the NEW plug into the Aux location.
  6. Wire up the buck converter using ring terminals to the powersupply.
  7. Route the 3 new wires out of the electronics compartment and close it up.

Marlin Firmware modification

Grab the latest firmware from CR-30 Users firmware

In Configuration.h:

  • Uncomment NEOPIXEL_LED and change the NEOPIXEL_PIXELS to match the number of LEDS on your strip.
  • You may also need to change the NEOPIXEL_TYPE depending on the neopixel strip you have.
// Support for Adafruit NeoPixel LED driver
#define NEOPIXEL_LED
#if ENABLED(NEOPIXEL_LED)
  #define NEOPIXEL_TYPE   NEO_GRB // NEO_GRBW / NEO_GRB - four/three channel driver type (defined in Adafruit_NeoPixel.h)
  #define NEOPIXEL_PIN     PA7    // LED driving pin
  //#define NEOPIXEL2_TYPE NEOPIXEL_TYPE
  //#define NEOPIXEL2_PIN    5
  #define NEOPIXEL_PIXELS 45       // Number of LEDs in the strip. (Longest strip when NEOPIXEL2_SEPARATE is disabled.)
  #define NEOPIXEL_IS_SEQUENTIAL   // Sequential display for temperature change - LED by LED. Disable to change all LEDs at once.
  #define NEOPIXEL_BRIGHTNESS 225  // Initial brightness (0-255)
  #define NEOPIXEL_STARTUP_TEST  // Cycle through colors at startup

  // Support for second Adafruit NeoPixel LED driver controlled with M150 S1 ...
  //#define NEOPIXEL2_SEPARATE
  #if ENABLED(NEOPIXEL2_SEPARATE)
    #define NEOPIXEL2_PIXELS      15  // Number of LEDs in the second strip
    #define NEOPIXEL2_BRIGHTNESS 127  // Initial brightness (0-255)
    #define NEOPIXEL2_STARTUP_TEST    // Cycle through colors at startup
  #else
    //#define NEOPIXEL2_INSERIES      // Default behavior is NeoPixel 2 in parallel
  #endif

  // Use some of the NeoPixel LEDs for static (background) lighting
  //#define NEOPIXEL_BKGD_INDEX_FIRST  0              // Index of the first background LED
  //#define NEOPIXEL_BKGD_INDEX_LAST   5              // Index of the last background LED
  //#define NEOPIXEL_BKGD_COLOR { 255, 255, 255, 0 }  // R, G, B, W
  //#define NEOPIXEL_BKGD_ALWAYS_ON                   // Keep the backlight on when other NeoPixels are off
#endif

In Configuration_adv.h:

  • Uncomment LED_CONTROL_MENU and change the LED_COLOR_PRESET values per below:
  /**
   * LED Control Menu
   * Add LED Control to the LCD menu
   */
  #define LED_CONTROL_MENU
  #if ENABLED(LED_CONTROL_MENU)
    #define LED_COLOR_PRESETS                 // Enable the Preset Color menu option
    //#define NEO2_COLOR_PRESETS              // Enable a second NeoPixel Preset Color menu option
    #if ENABLED(LED_COLOR_PRESETS)
      #define LED_USER_PRESET_RED        255  // User defined RED value
      #define LED_USER_PRESET_GREEN      255  // User defined GREEN value
      #define LED_USER_PRESET_BLUE       255  // User defined BLUE value
      #define LED_USER_PRESET_WHITE      255  // User defined WHITE value
      #define LED_USER_PRESET_BRIGHTNESS 255  // User defined intensity
      #define LED_USER_PRESET_STARTUP       // Have the printer display the user preset color on startup
    #endif
    #if ENABLED(NEO2_COLOR_PRESETS)
      #define NEO2_USER_PRESET_RED        255  // User defined RED value
      #define NEO2_USER_PRESET_GREEN      128  // User defined GREEN value
      #define NEO2_USER_PRESET_BLUE         0  // User defined BLUE value
      #define NEO2_USER_PRESET_WHITE      255  // User defined WHITE value
      #define NEO2_USER_PRESET_BRIGHTNESS 255  // User defined intensity
      //#define NEO2_USER_PRESET_STARTUP       // Have the printer display the user preset color on startup for the second strip
    #endif
  #endif

In src/pins/stm32f1/pins_CREALITY_V4210.h:

  • Change the Y_STOP_PIN:
#define Y_STOP_PIN                          PA15

Klipper Configuration

In printer.cfg:*

  • Change the stepper_y endstop pin
  • Enable neopixel support
[stepper_y]
endstop_pin: ^!PA15

# Neopixel LED support
[neopixel led_neopixel]
pin: PA7
chain_count: 45
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