BitBastelei #234 - WS2812B (Neopixel) Uhr
(132 MB) 00:38:13
2017-03-12 11:00
🛈Die WS2812B, auch bekannt als Neopixel, sind RGB-LEDs mit internem Steuer-IC, welche sich über einen einzelnen Datenpin kaskadieren und separat ansteuern lassen. Als in meinem Feed ein Angebot für ¼-Kreise mit 15 dieser LEDs durchtickerte war der Plan schnell klar: 4 ¼-Kreise á 15 LEDs macht 60 LEDs. Passend für eine Uhr. Mal schauen, ob es auch funktioniert.
Zur Zeithaltung kommt ein DS3231 zum Einsatz – ein I²C-Chip, welcher speziell für Uhren gedacht ist und genauer funktioniert als die internen Taktgeber der üblichen µCs.
Inhalt:
- 00:00 LED-Module & Aufbauplan
- 08:22 LED-Test mit Adafruit-Library
- 12:32 Warum RTC statt Systemtakt / millis()?
- 17:05 Blick auf die Software
- 34:13 Uhr in Aktion
Code:
/**
* NeoClock
*
* Clock using 60 WS2812B/Neopixel LEDs and DS3231 RTC
*
* Libraries needed:
* * Adafruit NeoPixel (Library Manager) - Phil Burgess / Paint Your Dragon for Adafruit Industries - LGPL3
* * Rtc by Makuna (Library Manager) - Michael C. Miller
* * Arduino Timezone Library (https://github.com/JChristensen/Timezone) - Jack Christensen - CC-BY-SA
* * Time Library (https://github.com/PaulStoffregen/Time) - Paul Stoffregen, Michael Margolis - LGPL2.1
*/
#include <Adafruit_NeoPixel.h>
#ifdef __AVR__
#include <avr/power.h>
#endif
#if defined(ESP8266)
#include <pgmspace.h>
#else
#include <avr/pgmspace.h>
#endif
#include <SoftwareWire.h> // must be included here so that Arduino library object file references work
#include <RtcDS3231.h>
#include <Time.h> //http://www.arduino.cc/playground/Code/Time
#include <Timezone.h> //https://github.com/JChristensen/Timezone
#include <EEPROM.h>
//Central European Time (Frankfurt, Paris)
TimeChangeRule CEST = {"CEST", Last, Sun, Mar, 2, 120}; //Central European Summer Time
TimeChangeRule CET = {"CET ", Last, Sun, Oct, 3, 60}; //Central European Standard Time
Timezone CE(CEST, CET);
TimeChangeRule *tcr; //pointer to the time change rule, use to get the TZ abbrev
time_t utc;
SoftwareWire myWire(8, 9);
RtcDS3231<SoftwareWire> Rtc(myWire);
#define PIN 6
unsigned long lastMillis = millis();
byte dimmer = 0x88;
byte hmark = 0;
byte ohour=0;
byte ominute=0;
byte osecond=0;
boolean fader=true;
Adafruit_NeoPixel strip = Adafruit_NeoPixel(60, PIN, NEO_GRB + NEO_KHZ800);
void setup() {
Serial.begin(115200);
strip.begin();
strip.show(); // Initialize all pixels to 'off'
Rtc.Begin();
Rtc.Enable32kHzPin(false);
Rtc.SetSquareWavePin(DS3231SquareWavePin_ModeNone);
if (!Rtc.GetIsRunning())
{
Serial.println("RTC was not actively running, starting now");
Rtc.SetIsRunning(true);
}
if (!Rtc.IsDateTimeValid())
{
// Common Cuases:
// 1) the battery on the device is low or even missing and the power line was disconnected
Serial.println("RTC lost confidence in the DateTime!");
}
byte eechk = EEPROM.read(0);
if(eechk == 0xAA) { //Assume this is our config and not a fresh chip
dimmer = EEPROM.read(1);
hmark = EEPROM.read(2);
fader = EEPROM.read(3);
}
timeSync();
}
void calcTime(void) {
utc = now();
CE.toLocal(utc, &tcr);
ohour = hour(utc);
ominute = minute(utc);
if(osecond != second(utc)) {
osecond = second(utc);
lastMillis = millis();
if(ominute == 0 && osecond == 0) {
//Every hour
timeSync();
}
}
}
void addPixelColor(byte pixel, byte color, byte brightness) {
color *= 8;
uint32_t acolor = brightness;
acolor <<= color;
uint32_t ocolor = strip.getPixelColor(pixel);
ocolor |= acolor;
strip.setPixelColor(pixel, ocolor);
}
void drawClock(byte h, byte m, byte s) {
strip.clear();
addPixelColor(m, 1, dimmer);
if(hmark > 0) {
for(byte i = 0; i<12; i++) {
addPixelColor((5*i), 2, hmark);
}
}
h %= 12;
h *= 5;
h += (m/12);
addPixelColor(h, 2, dimmer);
// 0x RR GG BB
if(fader) {
byte dim_s1 = dimmer;
byte dim_s2 = 0;
byte px_s2 = s+1;
if(px_s2 >= 60) px_s2 = 0;
unsigned long curMillis = millis()-lastMillis;
if(curMillis < 250) {
dim_s2 = 0;
dim_s1 = dimmer;
}else{
dim_s2 = map(curMillis, 250, 1000, 0, dimmer);
dim_s1 = dimmer - map(curMillis, 250, 1000, 0, dimmer);
}
addPixelColor(s, 0, dim_s1);
addPixelColor(px_s2, 0, dim_s2);
}else{
addPixelColor(s, 0, dimmer);
}
strip.show();
}
byte rounds = 0;
void loop() {
calcTime();
if(rounds++ > 100) {
Serial.print(ohour);
Serial.print(":");
Serial.print(ominute);
Serial.print(":");
Serial.println(osecond);
rounds = 0;
}
drawClock(ohour,ominute,osecond);
delay(10);
chkSer();
}
void timeSync(void) {
RtcDateTime dt = Rtc.GetDateTime();
setTime(dt.Hour(),dt.Minute(),dt.Second(),dt.Day(),dt.Month(),dt.Year());
Serial.print("Synced to: ");
Serial.print(dt.Year());
Serial.print("-");
Serial.print(dt.Month());
Serial.print("-");
Serial.print(dt.Day());
Serial.print("-");
Serial.print(dt.Hour());
Serial.print("-");
Serial.print(dt.Minute());
Serial.print("-");
Serial.println(dt.Second());
}
void timeSave(void) {
utc = now();
RtcDateTime store = RtcDateTime(year(utc), month(utc), day(utc), hour(utc), minute(utc), second(utc));
Rtc.SetDateTime(store);
Serial.print("Synced to: ");
Serial.print(year(utc));
Serial.print("-");
Serial.print(month(utc));
Serial.print("-");
Serial.print(day(utc));
Serial.print("-");
Serial.print(hour(utc));
Serial.print("-");
Serial.print(minute(utc));
Serial.print("-");
Serial.println(second(utc));
}
void setBrightness(byte brightness) {
dimmer = brightness;
}
void chkSer(void) {
unsigned int iy;
byte im,id,iH,iM,iS;
if(!Serial.available()) return;
switch(Serial.read()) {
case 'b':
setBrightness(Serial.parseInt());
Serial.print(F("Brightness changed to: "));
Serial.println(dimmer);
EEPROM.put(0, 0xAA);
EEPROM.put(1, dimmer);
break;
case 't':
iy = Serial.parseInt();
im = Serial.parseInt();
id = Serial.parseInt();
iH = Serial.parseInt();
iM = Serial.parseInt();
iS = Serial.parseInt();
setTime(iH,iM,iS,id,im,iy);
Serial.println(F("System time changed"));
break;
case 'f':
fader = false;
EEPROM.put(0, 0xAA);
EEPROM.put(3, 0);
Serial.println(F("Fader off"));
break;
case 'F':
fader = true;
EEPROM.put(0, 0xAA);
EEPROM.put(3, 1);
Serial.println(F("Fader on"));
break;
case 'm':
hmark = Serial.parseInt();
EEPROM.put(0, 0xAA);
EEPROM.put(2, hmark);
Serial.println(F("HMark changed"));
break;
case 's':
timeSync();
Serial.println(F("Synced RTC to System"));
break;
case 'S':
timeSave();
Serial.println(F("Synced System to RTC"));
break;
default:
Serial.println('?');
}
}
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