This example takes the Wemos Mini Ws2812B example a bit further on and use an 8 LED Neopixel strip
Here is an image of the strip we used
Layout
A simple connection required for this one, you connect 3v3 to 5v / Vcc of the strip, Gnd goes to Gnd and you need an I/O line to go to the DIN. I use D8 in the examples below.
Here is a layout to give you the idea
Code Examples
A couple of code examples
#include <Adafruit_NeoPixel.h>
#define PIN D8
//the Wemos WS2812B RGB shield has 1 LED connected to pin 2
Adafruit_NeoPixel pixels = Adafruit_NeoPixel(8, PIN, NEO_GRB + NEO_KHZ800);
void setup()
{
pixels.begin(); // This initializes the NeoPixel library.
}
void loop()
{
int led;
for(led=0; led <=8; led++)
{
setColor(led,255,0,0,100); //red
}
for(led=0; led <=8; led++)
{
setColor(led,0,255,255,100); //
}
for(led=0; led <=8; led++)
{
setColor(led,255,0,255,100); //
}
}
//simple function which takes values for the red, green and blue led and also
//a delay
void setColor(int led, int redValue, int greenValue, int blueValue, int delayValue)
{
pixels.setPixelColor(led, pixels.Color(redValue, greenValue, blueValue));
pixels.show();
delay(delayValue);
}
And another example
#include <Adafruit_NeoPixel.h>
#define PIN D8
Adafruit_NeoPixel pixels = Adafruit_NeoPixel(8, PIN, NEO_GRB + NEO_KHZ800);
void setup()
{
pixels.begin(); // This initializes the NeoPixel library.
}
void loop()
{
int led;
for(led=0; led <=7; led++)
{
setColor(led,255,0,0,100); //red
}
for(led=0; led <=7; led++)
{
setColor(led,0,0,0,100); //switch them off
}
}
//simple function which takes values for the red, green and blue led and also
//a delay
void setColor(int led, int redValue, int greenValue, int blueValue, int delayValue)
{
pixels.setPixelColor(led, pixels.Color(redValue, greenValue, blueValue));
pixels.show();
delay(delayValue);
}
a random color example
#include <Adafruit_NeoPixel.h>
#define PIN D8
//the Wemos WS2812B RGB shield has 1 LED connected to pin 2
Adafruit_NeoPixel pixels = Adafruit_NeoPixel(8, PIN, NEO_GRB + NEO_KHZ800);
void setup()
{
pixels.begin(); // This initializes the NeoPixel library.
randomSeed(analogRead(0));
}
void loop()
{
rndColor(100);
}
//simple function which takes values for the red, green and blue led and also
//a delay
void setColor(int led, int redValue, int greenValue, int blueValue, int delayValue)
{
pixels.setPixelColor(led, pixels.Color(redValue, greenValue, blueValue));
pixels.show();
delay(delayValue);
}
void rndColor(int delayValue)
{
int led = random(0,7);
int redValue = random(0, 255);
int greenValue = random(0, 255);
int blueValue = random(0, 255);
pixels.setPixelColor(led, pixels.Color(redValue, greenValue, blueValue));
pixels.show();
delay(delayValue);
}
