Published December 29, 2021 © CC BY

Tunable RGB LED Stick PCB

Thank you JLCPCB for sponsoring this project. Please order your PCB at jlcpcb.com/RAT

IntermediateWork in progress3 hours261

Things used in this project

Hardware components

JLCPCB Customized PCB

Arduino Nano R3

Single Turn Potentiometer- 10k ohms

WS2812B Addressable RGB LED

Female Header 15 Position 1 Row (2.54mm)

DIP Switch 2 Pin SMD

Software apps and online services

Arduino IDE

Hand tools and fabrication machines

Hot Air Station, Industrial

Solder Paste, Rework

Soldering iron (generic)

Solder Wire, Lead Free

Story

Thank you JLCPCB for sponsoring this project.

The Tunable RGB LED Stick can change the colors of the WS2812B addressable RGB LEDs by varying the HSV and the RGB parameters.

HSV stands for Hue, Saturation, Value.

Hue is the color of the light from red to magenta.

Saturation is the grayness of the color, lower means more gray, higher means more towards that color.

Value is the brightness of the color, lower means darker, higher means brighter.

There are 2 sets of 8 LEDs on each side of the PCB. Each side is controlled by either only HSV or RGB parameter.

We are using the FastLED Arduino library for the Arduino Nano board. The HSV and the RGB vary from 0 to 255 for each parameter. The 3362P potentiometers are used to tune the parameters.

It is highly recommended to use an external power supply such as USB C board and add in a capacitor parallel to the power supply to the 2 power supply copper pads.

Thank you JLCPCB again for sponsoring this project and please order your PCB at jlcpcb.com/RAT

Code

Tunable RGB LED Stick Code

#include <FastLED.h>

#define NUM_STRIPS 2
#define NUM_LEDS_PER_STRIP 16
CRGB leds[NUM_STRIPS][NUM_LEDS_PER_STRIP];

#define Pot_H A0
#define Pot_S A1
#define Pot_V A2
#define Pot_R A3
#define Pot_G A4
#define Pot_B A5

int i, j;

void setup()
{
  pinMode (Pot_H, INPUT);
  pinMode (Pot_S, INPUT);
  pinMode (Pot_V, INPUT);
  pinMode (Pot_R, INPUT);
  pinMode (Pot_G, INPUT);
  pinMode (Pot_B, INPUT);
  FastLED.addLeds<WS2812B, 2, RGB>(leds[0], NUM_LEDS_PER_STRIP);   //GRB
  FastLED.addLeds<WS2812B, 3, RGB>(leds[1], NUM_LEDS_PER_STRIP);   //GRB
}

void loop()
{
  int Pot_H_val = map(analogRead(Pot_H), 0, 1023, 0, 255);
  int Pot_S_val = map(analogRead(Pot_S), 0, 1023, 0, 255);
  int Pot_V_val = map(analogRead(Pot_V), 0, 1023, 0, 255);
  
  int Pot_R_val = map(analogRead(Pot_R), 0, 1023, 0, 255);
  int Pot_G_val = map(analogRead(Pot_G), 0, 1023, 0, 255);
  int Pot_B_val = map(analogRead(Pot_B), 0, 1023, 0, 255);

  for (i=0; i<16; i++)
  {
    leds[0][i] = CHSV(Pot_H_val, Pot_S_val, Pot_V_val);
    FastLED.show();
  }
  for (j=0; j<16; j++)
  {
    leds[1][j] = CRGB(Pot_G_val, Pot_R_val, Pot_B_val);
    FastLED.show();
  }
  delay (10);
}

Tunable RGB LED Stick PCB

Things used in this project

Hardware components

Software apps and online services

Hand tools and fabrication machines

Story

Schematics

Tunable RGB LED Stick Schematic PDF

Tunable RGB LED Stick Schematic