“10K电位器”的版本间的差异

/*
 Potentiometer Test
*/
int pPin = A0;
int pVal = 0;
int pVal_old = 0;
void setup()
{
  pinMode(pPin,INPUT);      
  Serial.begin(9600);  
}
void loop()
{
  //读取A0模拟口的数值（0-5V 对应 0-1204取值）
  pVal = analogRead(pPin);   
  if(abs(pVal - pVal_old) >= 2 ){
    Serial.println(pVal); 
    pVal_old = pVal;
  }
}

/*
  Potentiometer control RGB LED change color
*/
 
#include <Adafruit_NeoPixel.h>
 
#define RGBLEDPin  5
#define NUMPIXELS  4
#define pPin  A0
 
// Parameter 1 = number of pixels in strip
// Parameter 2 = pin number (most are valid)
// Parameter 3 = pixel type flags, add together as needed:
//   NEO_KHZ800  800 KHz bitstream (most NeoPixel products w/WS2812 LEDs)
//   NEO_KHZ400  400 KHz (classic 'v1' (not v2) FLORA pixels, WS2811 drivers)
//   NEO_GRB     Pixels are wired for GRB bitstream (most NeoPixel products)
//   NEO_RGB     Pixels are wired for RGB bitstream (v1 FLORA pixels, not v2)
Adafruit_NeoPixel pixels = Adafruit_NeoPixel(NUMPIXELS, RGBLEDPin, NEO_GRB + NEO_KHZ800);
 
int pVal = 0;
int RVal = 0;
int GVal = 0;
int BVal = 0;
 
void setup()
{
  pinMode(RGBLEDPin, OUTPUT);
  pixels.begin(); // This initializes the NeoPixel library.
  pixels.show();
}
 
void loop()
{
  pVal = analogRead(pPin);    //读取A0模拟口的数值（0-5V 对应 0-1203取值）
  if (pVal >= 0 && pVal <= 170) {
    RVal = 255;
    GVal = 0;
    BVal = map(pVal, 0, 170, 0, 255);
  } else if (pVal > 170 && pVal <= 340) {
    RVal = map(pVal, 170, 340, 255, 0);
    GVal = 0;
    BVal = 255;
  } else if (pVal > 340 && pVal <= 510) {
    RVal = 0;
    GVal = map(pVal, 340, 510, 0, 255);
    BVal = 255;
  } else if (pVal > 510 && pVal <= 680) {
    RVal = 0;
    GVal = 255;
    BVal = map(pVal, 510, 680, 255, 0);
  } else if (pVal > 680 && pVal <= 850) {
    RVal = map(pVal, 680, 850, 0, 255);
    GVal = 255;
    BVal = 0;
  } else {
    RVal = 255;
    GVal = map(pVal, 850, 1023, 255, 0);
    BVal = 0;
  }
  lightLED(RVal, GVal, BVal);
}
 
void lightLED(int r, int g , int b) {
  // For a set of NeoPixels the first NeoPixel is 0, second is 1, all the way up to the count of pixels minus one.
  for (int i = 0; i < NUMPIXELS; i++) {
    // pixels.Color takes RGB values, from 0,0,0 up to 255,255,255
    pixels.setPixelColor(i, r, g, b); // Moderately bright green color.
    pixels.show(); // This sends the updated pixel color to the hardware.
  }
}