#include <Adafruit_NeoPixel.h>
Adafruit_NeoPixel pixel(16, 20, NEO_GRB + NEO_KHZ800);
bool state;
void setup(){
   pixel.begin();
 


}

void loop(){
    state = !state;
    pixel.setPixelColor(state, pixel.Color(0, 150, 0));
        pixel.setPixelColor(state, pixel.Color(1, 150, 0));

    pixel.show();
    delay(500);
}