Wemos RGB Shield

Install Adafruit_NeoPixel_Library first.

When we setup the NeoPixel library, we tell it how many pixels, and which pin to use to send signals. Note that for older NeoPixel strips you might need to change the third parameter—see the strandtest example for more information on possible values.

Some example code:

#include <Adafruit_NeoPixel.h>
 
#define PIN   D4
#define LED_NUM 7
 
Adafruit_NeoPixel leds = Adafruit_NeoPixel(LED_NUM, PIN, NEO_GRB + NEO_KHZ800);
 
void setup() {
  leds.begin(); // This initializes the NeoPixel library.
}
 
void led_set(uint8 R, uint8 G, uint8 B) {
  for (int i = 0; i < LED_NUM; i++) {
    leds.setPixelColor(i, leds.Color(R, G, B));
    leds.show();
    delay(50);
  }
}
 
void loop() {
 
  led_set(10, 0, 0);//red
  led_set(0, 0, 0);
 
  led_set(0, 10, 0);//green
  led_set(0, 0, 0);
}

The controller will be able to run everything through this one data pin.