NEOPIXEL Arduino Nano via HC-05. need help with the zeRGBa mode

Solved
1

Hi guys! i’m new to arduino and i’m trying to make my neopixel ring work with blynk. I used the example code fot my BT device, it connects and the app recognizes the bluetooth but the neopixels don’t seem to respond.

I want to use the zeRGBa widget.

i used this code :slight_smile:

#define BLYNK_PRINT Serial


#include <SoftwareSerial.h>
SoftwareSerial SwSerial(10, 11); // RX, TX
    #include <BlynkSimpleSerialBLE.h>
#include <Adafruit_NeoPixel.h>


char auth[] = "bcbc198b969948b4b39d1a01c97a00f2";

SoftwareSerial SerialBLE(10, 11); // RX, TX

#define PIN A5

Adafruit_NeoPixel strip = Adafruit_NeoPixel(16, PIN, NEO_GRB + NEO_KHZ800);

// Input a value 0 to 255 to get a color value.
// The colours are a transition r - g - b - back to r.
uint32_t Wheel(byte WheelPos) {
  if (WheelPos < 85) {
    return strip.Color(WheelPos * 3, 255 - WheelPos * 3, 0);
  } else if (WheelPos < 170) {
    WheelPos -= 85;
    return strip.Color(255 - WheelPos * 3, 0, WheelPos * 3);
  } else {
    WheelPos -= 170;
    return strip.Color(0, WheelPos * 3, 255 - WheelPos * 3);
  }
}

BLYNK_WRITE(V1)
{
  int shift = param.asInt();
  for (int i = 0; i < strip.numPixels(); i++)
  {
  strip.setPixelColor(i, Wheel(((i * 256 / strip.numPixels()) + shift) & 255));
  }
  strip.show();
}

void setup()
{
  // Debug console
  Serial.begin(9600);

  SerialBLE.begin(9600);
  Blynk.begin(SerialBLE, auth);

  Serial.println("Waiting for connections...");

  strip.begin();
  strip.show();
}

void loop()
{
  Blynk.run();
}
2

zeRGBa sends three values. Did you set it up in your Blynk project to SPLIT or MERGE mode? and what pins have you selected for the widget?

3

Hi shurik179, i’m using it in merge mode, with the V1 virtual pin. I guess the example code sets it up like that? or do i have to declare it in some way?

4

In merge mode, values should be read as follows (see http://docs.blynk.cc/#widgets-controllers-zergba )

BLYNK_WRITE(V1) // zeRGBa assigned to V1 
{
    // get a RED channel value
    int r = param[0].asInt();
    // get a GREEN channel value
    int g = param[1].asInt();
    // get a BLUE channel value
    int b = param[2].asInt();
}
5

Try this:

#include <Adafruit_NeoPixel.h>
#define D0 16 
#define PIN D0
#define NUMPIXELS 1 

Adafruit_NeoPixel pixels = Adafruit_NeoPixel(NUMPIXELS, 13, NEO_GRB + NEO_KHZ800);

Then

BLYNK_WRITE(V1)
{
int R = param[0].asInt();
int G = param[1].asInt();
int B = param[2].asInt();

for(int i=0;i<NUMPIXELS;i++){
    // pixels.Color takes RGB values, from 0,0,0 up to 255,255,255
    pixels.setPixelColor(i, pixels.Color(R,G,B)); // Moderately bright green color.
    pixels.show(); // This sends the updated pixel color to the hardware.
}
}

void loop()
{
  Blynk.run();
}
6

HI Guys! thank you so much for your help! It’s working!:heart_eyes:

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