//
// 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.
//
// I added xyz

#include <Adafruit_NeoPixel.h>
//
// globals
//
#define numpixels 1
#define pixelpower 11
#define pixelpin 12
#define bufsize 25
char buf[bufsize];
int count=0;
//
// setup
//
Adafruit_NeoPixel pixel(numpixels,pixelpin,NEO_GRB+NEO_KHZ800);
void setup() {
   Serial.begin();
   pixel.begin();
   pinMode(pixelpower,OUTPUT);
   digitalWrite(pixelpower,HIGH);
   }
//
// main loop
//
void loop() {
   int ch;
   //
   // check for a char
   //
   if (Serial.available()) {
      //
      // read, save, and send char
      //
      ch = Serial.read();
      if (ch = 1)
      {
      pixel.setPixelColor(0,pixel.Color(255,255,255));
      pixel.show();
      delay(200);
      }
      else if (ch = 0)
      {
        pixel.setPixelColor(0,pixel.Color(0,0,255));
      pixel.show();
      delay(200);
      }
      else if (ch = 2)
      {
        pixel.setPixelColor(0,pixel.Color(255,0,0));
      pixel.show();
      delay(200);
      }
      else
      {
        pixel.setPixelColor(0,pixel.Color(0,255, 255));
      pixel.show();
      delay(200);
      }
      }
      else
      {
                pixel.setPixelColor(0,pixel.Color(0,255, 0));
      pixel.show();
      delay(200);
      }
   }