色相環で表示するテーブルランプ時計（ESP32+NeoPixelRing）

木工品の中に入れて光らせるテーブルランプを作ります。

Wi-Fi経由でNTPサーバーから時刻を取得して、24時間でランプの色を色相環を一周させます。
8時：赤（あか）
10時：橙（だいだい）
12時：黄橙（きだいだい）
14時：黄（き）
16時：黄緑（きみどり）
18時：緑（みどり）
20時：青緑（あおみどり）
22時：緑青（みどりあお）
0時：青（あお）
2時：青紫（あおむらさき）
4時：紫（むらさき）
6時：赤紫（あかむらさき）
毎時3分間と１分ごとの10秒間は少し光り方を変化させることにしました。また、日中は明るく、夜間は暗く光るようにしています。

ESP32(MH-ET LIVE ESP32 MiniKit)でシリアルフルカラーLEDを制御するのですが、暑い夏にハンダ付けをするのが面倒になったので、NeoPixelRing（12個）を使いました。VCC、GND、IO16だけ使います。コンパクトにするためにヘッダーピンは使わずに直接ハンダ付けをします。ケースは適当に3Dプリンターで出力しました。

Arduinoプログラムは以下のものを使いました。WiFiのSSIDとパスワードが必要です。

// Lamp Clock 2022 
// LampClockT05 by Koji Ohashi @MaDA Lab
// 2022.08.10
// for NeoPixelRing12

#include <WiFi.h>
#include "time.h"
const char* ssid       = "***********";
const char* password   = "***********";
const char* ntpServer = "ntp.nict.jp";
const long  gmtOffset_sec = 9*3600;
const int   daylightOffset_sec = 0;
int SecCount=300;
int ntpIntervalSec=1200;//sec

//------------------------------
hw_timer_t * timer = NULL;
volatile SemaphoreHandle_t timerSemaphore;
portMUX_TYPE timerMux = portMUX_INITIALIZER_UNLOCKED;
//------------------------------

#include <FastLED.h>
#define DATA_PIN 16
#define NUM_LEDS 12
#define DAY_VALUE 180
#define NIGHT_VALUE 50
#define DAY_START 6 
#define DAY_END 17 
CRGBArray<NUM_LEDS> leds;
CRGBPalette16 currentPalette;
TBlendType    currentBlending;
#define UPDATES_PER_SECOND 100
boolean DayTime=true;
boolean Start_Hour=false;
boolean End_Minute=false;
boolean NewHourPalette=false;
boolean NewMinutePalette=false;
int LED_Hue=0;
int LED_Value=0;

void setup() { 
  Serial.begin(115200);
  delay(500);
  Serial.println("LampClockT05 by Koji Ohashi @MaDA Lab");
  //connect to WiFi
  Serial.printf("Connecting to %s ", ssid);
  WiFi.begin(ssid, password);
  while (WiFi.status() != WL_CONNECTED) {
      delay(500);
      Serial.print(".");
  }
  Serial.println(" CONNECTED");
  configTime(gmtOffset_sec, daylightOffset_sec, ntpServer);
  printLocalTime();
  //---------------
  onTimerSetup();
  //---------------
  FastLED.addLeds<WS2812B, DATA_PIN, GRB>(leds, NUM_LEDS);
  currentPalette = RainbowColors_p;
  currentBlending = LINEARBLEND;
  clearDisplay();
  delay(3000);
  
}

void loop(){
  if (xSemaphoreTake(timerSemaphore, 0) == pdTRUE){
    printLocalTime();
    SecCount=SecCount+1;
  }
  if(SecCount>=ntpIntervalSec){
    configTime(gmtOffset_sec, daylightOffset_sec, ntpServer);
    Serial.print("Updated to ");
    printLocalTime();
    SecCount=0;
  }

  if(DayTime){
    LED_Value=DAY_VALUE;
  } else {
    LED_Value=NIGHT_VALUE;
  }
  if(!Start_Hour){NewHourPalette=false;}
  if(!End_Minute){NewMinutePalette=false;}
  if(Start_Hour && !NewHourPalette){
    HourPalette();
  }
  if(!Start_Hour && End_Minute && !NewMinutePalette){
    MinutePalette();
  }
  if(Start_Hour || End_Minute){
    LED_Palette();
  } else {
    LED_Display();
  }
}

void printLocalTime(){
  struct tm timeInfo;
  getLocalTime(&timeInfo);
  int time_h=timeInfo.tm_hour;;
  int time_m=timeInfo.tm_min;
  int time_s=timeInfo.tm_sec;
  DayTime=(time_h>=DAY_START)&&(time_h<=DAY_END);//Day or Night
  Start_Hour=(time_m < 3);  //HourPalette
  End_Minute=(time_s > 50); //colorChange
  
  int DayMins=time_h*60 + time_m; //DayMins:0 to 1440
  DayMins=(DayMins+960)%1440;     //8時(480)を0にオフセットするために480を引く代わりに960を足す。
  LED_Hue = map(DayMins,0,1440,0,255); //LEDの色を設定する

  Serial.print(time_h);
  Serial.print(":");
  Serial.print(time_m);
  Serial.print(":");
  Serial.println(time_s);
}

void LED_Display(){
  for(int i=0;i<NUM_LEDS;i++){
    leds[i] = CHSV( LED_Hue, 255, LED_Value);
  }
  FastLED.show();
  FastLED.delay(1000 / UPDATES_PER_SECOND);
}

void clearDisplay(){
  for(int i=0;i<NUM_LEDS;i++){
    leds[i] = CRGB::Black;
  }
  FastLED.show();
}

void LED_Palette(){
  static uint8_t startIndex = 0;
  startIndex = startIndex + 1; /* motion speed */
  FillLEDsFromPaletteColors( startIndex);
  FastLED.show();
  FastLED.delay(1000 / UPDATES_PER_SECOND);
}

void FillLEDsFromPaletteColors( uint8_t colorIndex)
{
    uint8_t brightness = 255;
    for( int i = 0; i < NUM_LEDS; i++) {
        leds[i] = ColorFromPalette( currentPalette, colorIndex, brightness, currentBlending);
        colorIndex += 3;
    }
}

void HourPalette()
{
    CRGB DayMins = CHSV( LED_Hue, 255, LED_Value);
    CRGB DayMins1  = CHSV( (LED_Hue+85)%255, 255, LED_Value);
    CRGB DayMins2  = CHSV( (LED_Hue+170)%255, 255, LED_Value);
    currentPalette = CRGBPalette16(
                                   DayMins,  DayMins,  DayMins,  DayMins,
                                   DayMins, DayMins, DayMins,  DayMins,
                                   DayMins1,  DayMins1,  DayMins1,  DayMins1,
                                   DayMins2, DayMins2, DayMins2,  DayMins2 );
    NewHourPalette=true;
}

void MinutePalette()
{
    CRGB DayMins = CHSV( LED_Hue, 255, LED_Value);
    CRGB dark  = CHSV( LED_Hue, 255, LED_Value/2);
    CRGB black  = CRGB::Black;
    currentPalette = CRGBPalette16(
                                   dark,  dark,  DayMins,  DayMins,
                                   DayMins, dark, dark,  dark,
                                   DayMins,  DayMins,  DayMins,  DayMins,
                                   DayMins, DayMins, dark,  dark );
    NewMinutePalette=true;
}


void IRAM_ATTR onTimer(){
  portENTER_CRITICAL_ISR(&timerMux);
  portEXIT_CRITICAL_ISR(&timerMux);
  xSemaphoreGiveFromISR(timerSemaphore, NULL);//Give a semaphore that we can check in the loop
}

void onTimerSetup(){
  timerSemaphore = xSemaphoreCreateBinary();
  timer = timerBegin(0, 80, true);
  timerAttachInterrupt(timer, &onTimer, true);//Attach onTimer function to our timer.
  timerAlarmWrite(timer, 1000000, true);//alarm 1sec interval
  timerAlarmEnable(timer);//Start an alarm
}

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// Lamp Clock 2022

// LampClockT05 by Koji Ohashi @MaDA Lab

// 2022.08.10

// for NeoPixelRing12

#include <WiFi.h>

#include "time.h"

const char* ssid = "***********";

const char* password = "***********";

const char* ntpServer = "ntp.nict.jp";

const long gmtOffset_sec = 9*3600;

const int daylightOffset_sec = 0;

int SecCount=300;

int ntpIntervalSec=1200;//sec

//------------------------------

hw_timer_t * timer = NULL;

volatile SemaphoreHandle_t timerSemaphore;

portMUX_TYPE timerMux = portMUX_INITIALIZER_UNLOCKED;

//------------------------------

#include <FastLED.h>

#define DATA_PIN 16

#define NUM_LEDS 12

#define DAY_VALUE 180

#define NIGHT_VALUE 50

#define DAY_START 6

#define DAY_END 17

CRGBArray<NUM_LEDS> leds;

CRGBPalette16 currentPalette;

TBlendType currentBlending;

#define UPDATES_PER_SECOND 100

boolean DayTime=true;

boolean Start_Hour=false;

boolean End_Minute=false;

boolean NewHourPalette=false;

boolean NewMinutePalette=false;

int LED_Hue=0;

int LED_Value=0;

void setup() {

Serial.begin(115200);

delay(500);

Serial.println("LampClockT05 by Koji Ohashi @MaDA Lab");

//connect to WiFi

Serial.printf("Connecting to %s ", ssid);

WiFi.begin(ssid, password);

while (WiFi.status() != WL_CONNECTED) {

delay(500);

Serial.print(".");

}

Serial.println(" CONNECTED");

configTime(gmtOffset_sec, daylightOffset_sec, ntpServer);

printLocalTime();

//---------------

onTimerSetup();

//---------------

FastLED.addLeds<WS2812B, DATA_PIN, GRB>(leds, NUM_LEDS);

currentPalette = RainbowColors_p;

currentBlending = LINEARBLEND;

clearDisplay();

delay(3000);

}

void loop(){

if (xSemaphoreTake(timerSemaphore, 0) == pdTRUE){

printLocalTime();

SecCount=SecCount+1;

}

if(SecCount>=ntpIntervalSec){

configTime(gmtOffset_sec, daylightOffset_sec, ntpServer);

Serial.print("Updated to ");

printLocalTime();

SecCount=0;

}

if(DayTime){

LED_Value=DAY_VALUE;

} else {

LED_Value=NIGHT_VALUE;

}

if(!Start_Hour){NewHourPalette=false;}

if(!End_Minute){NewMinutePalette=false;}

if(Start_Hour && !NewHourPalette){

HourPalette();

}

if(!Start_Hour && End_Minute && !NewMinutePalette){

MinutePalette();

}

if(Start_Hour || End_Minute){

LED_Palette();

} else {

LED_Display();

}

void printLocalTime(){

struct tm timeInfo;

getLocalTime(&timeInfo);

int time_h=timeInfo.tm_hour;;

int time_m=timeInfo.tm_min;

int time_s=timeInfo.tm_sec;

DayTime=(time_h>=DAY_START)&&(time_h<=DAY_END);//Day or Night

Start_Hour=(time_m < 3); //HourPalette

End_Minute=(time_s > 50); //colorChange

int DayMins=time_h*60 + time_m; //DayMins:0 to 1440

DayMins=(DayMins+960)%1440; //8時(480)を0にオフセットするために480を引く代わりに960を足す。

LED_Hue = map(DayMins,0,1440,0,255); //LEDの色を設定する

Serial.print(time_h);

Serial.print(":");

Serial.print(time_m);

Serial.print(":");

Serial.println(time_s);

}

void LED_Display(){

for(int i=0;i<NUM_LEDS;i++){

leds[i] = CHSV( LED_Hue, 255, LED_Value);

}

FastLED.show();

FastLED.delay(1000 / UPDATES_PER_SECOND);

}

void clearDisplay(){

for(int i=0;i<NUM_LEDS;i++){

leds[i] = CRGB::Black;

}

FastLED.show();

}

void LED_Palette(){

static uint8_t startIndex = 0;

startIndex = startIndex + 1; /* motion speed */

FillLEDsFromPaletteColors( startIndex);

FastLED.show();

FastLED.delay(1000 / UPDATES_PER_SECOND);

}

void FillLEDsFromPaletteColors( uint8_t colorIndex)

{

uint8_t brightness = 255;

for( int i = 0; i < NUM_LEDS; i++) {

leds[i] = ColorFromPalette( currentPalette, colorIndex, brightness, currentBlending);

colorIndex += 3;

}

void HourPalette()

{

CRGB DayMins = CHSV( LED_Hue, 255, LED_Value);

CRGB DayMins1 = CHSV( (LED_Hue+85)%255, 255, LED_Value);

CRGB DayMins2 = CHSV( (LED_Hue+170)%255, 255, LED_Value);

currentPalette = CRGBPalette16(

DayMins, DayMins, DayMins, DayMins,

DayMins1, DayMins1, DayMins1, DayMins1,

DayMins2, DayMins2, DayMins2, DayMins2 );

NewHourPalette=true;

}

void MinutePalette()

{

CRGB DayMins = CHSV( LED_Hue, 255, LED_Value);

CRGB dark = CHSV( LED_Hue, 255, LED_Value/2);

CRGB black = CRGB::Black;

currentPalette = CRGBPalette16(

dark, dark, DayMins, DayMins,

DayMins, dark, dark, dark,

DayMins, DayMins, DayMins, DayMins,

DayMins, DayMins, dark, dark );

NewMinutePalette=true;

}

void IRAM_ATTR onTimer(){

portENTER_CRITICAL_ISR(&timerMux);

portEXIT_CRITICAL_ISR(&timerMux);

xSemaphoreGiveFromISR(timerSemaphore, NULL);//Give a semaphore that we can check in the loop

}

void onTimerSetup(){

timerSemaphore = xSemaphoreCreateBinary();

timer = timerBegin(0, 80, true);

timerAttachInterrupt(timer, &onTimer, true);//Attach onTimer function to our timer.

timerAlarmWrite(timer, 1000000, true);//alarm 1sec interval

timerAlarmEnable(timer);//Start an alarm

}