RGB LED Wiring Diagram and Code

Need to finish up some other stuff, but here's a schematic I made about the lights in this video:

 

Attached is a completely stock V3 Firmware with this added in on

Marlin_Main.cpp:

Code:

#ifdef TEMP_STAT_LEDS
static uint32_t stat_update = 0;
//Virtual Variables
int Rval = 0;
int Gval = 0;
int Bval = 0;
int LEDmax = 150;
int temp;
int target;
//Static Colors
void white(){Rval = LEDmax;Gval = LEDmax;Bval = LEDmax;}
void red(){Rval = LEDmax;Gval = 0;Bval = 0;}
void green(){Rval = 0;Gval = LEDmax;Bval = 0;}
void blue(){Rval = 0;Gval = 0;Bval = LEDmax;}
//Handle Led Stauts
void handle_status_leds(){
//Fade Leds On when starting up

  if(millis() > stat_update) {
//Update Status
    stat_update += 50; // Update every 0.05s
    for (int8_t cur_extruder = 0; cur_extruder < EXTRUDERS; ++cur_extruder) {
       temp = degHotend(cur_extruder);
       target = degTargetHotend(cur_extruder);
    }
    if(Rval+Gval+Bval == 0){
//length of delay
      int t = 2;
      for(int r = 0; r<LEDmax; r++){Rval = r;analogWrite(STAT_LED_RED, Rval);delay(t);}
      for(int r = LEDmax; r>0; r--){Rval = r;analogWrite(STAT_LED_RED, Rval);delay(t);}
      for(int g = 0; g<LEDmax; g++){Gval = g;analogWrite(STAT_LED_GREEN, Gval);delay(t);}
      for(int g = LEDmax; g>0; g--){Gval = g;analogWrite(STAT_LED_GREEN, Gval);delay(t);}
      for(int b = 0; b<LEDmax; b++){Bval = b;analogWrite(STAT_LED_BLUE, Bval);delay(t);}
      for(int b = LEDmax; b>0; b--){Bval = b;analogWrite(STAT_LED_BLUE, Bval);delay(t);}
      for(int w = 0; w<LEDmax; w++){Rval = w; Gval = w; Bval = w;analogWrite(STAT_LED_RED, Rval);analogWrite(STAT_LED_GREEN, Gval);analogWrite(STAT_LED_BLUE, Bval);delay(t);}
    }
//White at Idle
    if(target == 0){white();}
//Green when Finished
    if(target == 5){green();}
    if((target != 0)&&(target != 5)){
//White at temp     
      if((target >= temp-TEMP_HYSTERESIS)&&(target <= temp+TEMP_HYSTERESIS)){white();}
//Blue to Red Depending on Temp
      else{
        if(temp < 40){blue();}
        if(temp > EXTRUDE_MINTEMP){red();}
        if((temp > 40)&&(temp < EXTRUDE_MINTEMP)){ 
          Rval = map(temp,40,EXTRUDE_MINTEMP,0,LEDmax);
          Gval = 0;
          if(Rval == 0){Bval = LEDmax;}
          if(Rval > 0){Bval = LEDmax-Rval;}
          if(Rval == LEDmax){Bval == 0;}
        }
      }
    }
//Write to LEDs
  analogWrite(STAT_LED_RED, Rval);
  analogWrite(STAT_LED_GREEN, Gval);
  analogWrite(STAT_LED_BLUE, Bval);
  }
}
#endif

and this in pins.h

Code:

#ifdef TEMP_STAT_LEDS
    #if MOTHERBOARD == 67
      #define STAT_LED_RED       6
      #define STAT_LED_BLUE     11
    #endif
    #if MOTHERBOARD == 33
    //Transistor RGB configuration
      #define STAT_LED_RED 6
      #define STAT_LED_BLUE 5
      #define STAT_LED_GREEN 4
    #endif
  #endif

 

Post well done!

 

I have followed your schematic and flashed the RGB code to the control board. If I hook up 12v+ and ground I only get bright white. If I hook up 12v+ without the ground I get red on start up and than it goes to a dim white light. Any suggestions would be appreciated.

 

Hmm, that's weird. It should be completely off when starting up, then flash Red, Green, then Blue then hold white. I've never seen that behavior from that code.

 

I have gone through your post and the schematic. I am also working on the same kind of project.
When i flashed your RGB code into my control board i found that if I hook up 12v+ and ground I only get bright white.
If I hook up 12v+ without the ground I get red on start up and than it goes to a dim white light.

 

UPDATE: Made an Instructable on how to wire this up with a few extra features
http://www.instructables.com/id/3D-Printer-RGB-LED-Feedback/

 

My first attempt was a fail however after your instructible post I wanted to know what went wrong with my first attempt. What I noticed was that I reversed the base and emitter on the NPN transistor, after making the change everything is working the way you intended them to. Thanks for the nice work.

 

hey how much current should the transistors be able to handle
like 12v 5a or something along those lines...

 

12v at 1a should be plenty, the lights don't take that much current to run. But a 5a tranistor will work as well. I used 2N2222

 

In your video you show that you removed the factory LED strips. Did you replace them with small RGB strips or remove them completely to go with just the longer one up top?

 

Gotcha. Thanks.

 

I love the idea so I decided to try it.
I have a Robo3D R1+ with the RC6 marlin firmware.

The wiring worked well (I didn't go directly with the instructions, I just wired...).
I had to do an extra step and unscrew my board and solder some male headers since it doesn't have them by default on mine.

I did encounter some Software problems though.
The pins.h file is structured differently so it doesn't match whats written anymore for RC6, but its just defines so put them wherever.
The code provided for Marlin_main.cpp didn't work for me at all, I only got a steady white (startup).
I checked with a simple algo to go through all colors and it worked, so problem must be with some changed global param that is being used or something like that.

@Marquis Johnson did you try your code with the RC6 version of marlin?

I'm going to look into this tomorrow probably and use the exiting code as a reference, I intended to change it anyway.

Bottom line, thanks @Marquis Johnson for a great idea!

 

I had that same issue when I had the pins in strictly digital outputs instead of PWM pins. Are the pins you used and defined PWN pins?
And I'm still using RC3 firmware, where can I get my hands on RC6?

 

I was able to display the full range of colors using these pins (4,5,6, same as you, different board though) so I doubt its the problem,
I will look at the code today/when I have time and will update if I understand whats up.

You can get the RC6 from their repo https://github.com/MarlinFirmware/Marlin,
Just follow WheresWaldo's great post that is still updating http://community.robo3d.com/index.p...lease-candidate-6-for-r1-r1-plus.5806/page-18 (page 18 has the RC6 files)

 

Found the problem with the LEDs not flashing.
The code makes them flash on the board's startup, but since I have a USB cable connect to the board its always up so switching on the power didn't make it flash.
I looked at the code and couldn't find a way to detect the power-on, will keep looking later

 

Yup, I looked into it and expect for the power supply pin which works only if you added something extra like a relay there isn't any indication.
I will look around and see maybe I can hack something