//
// hello.RP204-XIAO.blink-echo.ino
//
// Seeed XIAO RP2040 blink and echo hello-world
//
// Neil Gershenfeld 2/12/23
//
// This work may be reproduced, modified, distributed,
// performed, and displayed for any purpose, but must
// acknowledge this project. Copyright is retained and
// must be preserved. The work is provided as is; no
// warranty is provided, and users accept all liability.
//
#include <Adafruit_NeoPixel.h>
//
// globals
//
#define numpixels 1
#define pixelpower 11
#define pixelpin 12
#define bufsize 25
char buf[bufsize];
int count = 0;
int r = 0;
int g = 0;
int b = 0;
int t;

//
// setup
//
Adafruit_NeoPixel pixel(numpixels, pixelpin, NEO_GRB + NEO_KHZ800);
void setup() {
  Serial.begin();
  pixel.begin();
  pinMode(pixelpower, OUTPUT);
  digitalWrite(pixelpower, HIGH);

  t = 50;
}
//
// main loop
//
void loop() {

  pixel.setPixelColor(0, pixel.Color(r, g, b));
  pixel.show();
  delay(200);
  r+=t;

  if (r >= 255)
  { g+=t;
    r = 0;
  }
  if (g >= 255)
  {
    b+=t;
    g = 0;
  }
  if (b >= 255)
  {
    r = 0;
    g = 0;
    b = 0;
  }
  Serial.print(r);
  Serial.print(g);
  Serial.println(b);
//  Serial.println();
}