In der Variante 3 hat die Funkuhr zwei Controller,
einen für die flimmerfreie Anzeige und einen für die störungsfreie Erfassung des DCF Signals. Die Datenübertragung erfolg seriell von TX nach RX
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145
Coprozessor_DCF77.ino
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145
Coprozessor_DCF77.ino
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/* Das Programm dekodiert die DCF77 Zeit,
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macht die Paritätsprüfung und
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schickt die vier benötigten Ziffern für die Zeitanzeige
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als serielle Daten über den TX Pin 1 an den Anzeigecontroller.
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Datengeschwindigkeit: 9600 Baud
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Wenn ein gültiges Signal gesendet wurde, gibt es eine Pause von 30 Minuten,
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in dieser Zeit wird der DCF Empfänger an Pin 6 abgeschaltet.
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mit Hilfe von: https://wolles-elektronikkiste.de/dcf77-funkuhr
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30.04.2025
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*/
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#include <util/parity.h> //comment out if you don't use an AVR MCU
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#define dcfOnOut 6
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int interruptPin = 2;
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volatile unsigned long lastInt = 0;
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volatile unsigned long long currentBuf = 0;
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volatile byte bufCounter;
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volatile bool parityStat = 0;
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volatile byte dcf77MinuteEiner = 0;
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volatile byte dcf77MinuteZehner = 0;
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volatile byte dcf77HourEiner = 0;
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volatile byte dcf77HourZehner = 0;
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void setup() {
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Serial.begin(9600);
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pinMode(dcfOnOut, OUTPUT);
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digitalWrite(dcfOnOut, HIGH);
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pinMode(interruptPin, INPUT);
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attachInterrupt(digitalPinToInterrupt(interruptPin), DCF77_ISR, CHANGE);
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}
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void loop() {
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if (parityStat == 1) {
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delay(100);
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Serial.print(dcf77HourZehner);
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Serial.print(",");
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Serial.print(dcf77HourEiner);
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Serial.print(",");
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Serial.print(dcf77MinuteZehner);
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Serial.print(",");
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Serial.print(dcf77MinuteEiner);
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delay(100);
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digitalWrite(dcfOnOut, LOW);
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parityStat = 0;
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delay(1800000); // 30 Minuten, 15 Minuten Wartezeit: 900000
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digitalWrite(dcfOnOut, HIGH);
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}
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}
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/*************************************************************************
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lesen des dcf Signals am Pin 2
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**************************************************************************/
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void DCF77_ISR() { //
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unsigned int dur = 0;
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dur = millis() - lastInt;
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if (digitalRead(interruptPin)) {
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if (dur > 1500) {
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unsigned long highBuf = (currentBuf >> 32) & 0x7FFFFFF;
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unsigned long lowBuf = (currentBuf & 0xFFFFFFFF);
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bufCounter = 0;
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evaluateSequence();
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currentBuf = 0;
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}
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}
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else {
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if (dur > 150) {
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currentBuf |= ((unsigned long long)1 << bufCounter);
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}
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bufCounter++;
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}
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lastInt = millis();
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}
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/**************************************************************************
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Umwandlung Binärcode in Ziffern
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*************************************************************************/
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void evaluateSequence() {
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parityStat = 1;
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byte dcf77Year = (currentBuf >> 50) & 0xFF; // year = bit 50-57
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byte dcf77Month = (currentBuf >> 45) & 0x1F; // month = bit 45-49
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byte dcf77DayOfWeek = (currentBuf >> 42) & 0x07; // day of the week = bit 42-44
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byte dcf77DayOfMonth = (currentBuf >> 36) & 0x3F; // day of the month = bit 36-41
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byte dcf77Hour = (currentBuf >> 29) & 0x3F;
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dcf77HourEiner = (currentBuf >> 29) & 0xF; // hour = bit 29-34, 6 bit
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dcf77HourZehner = (currentBuf >> 33) & 0x3; // hour = bit 29-34, 6 bit
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byte dcf77Minute = (currentBuf >> 21) & 0x7F;
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dcf77MinuteEiner = (currentBuf >> 21) & 0xF; // minute = 21-27, 7 bit
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dcf77MinuteZehner = (currentBuf >> 25) & 0x7; // minute = 21-27, 7 bit
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bool parityBitMinute = (currentBuf >> 28) & 1;
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bool parityBitHour = (currentBuf >> 35) & 1;
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bool parityBitDate = (currentBuf >> 58) & 1;
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/***************************************************************************
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Paritätsprüfung
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***************************************************************************/
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if ((parity_even_bit(dcf77Minute)) != parityBitMinute) {
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parityStat = 0;
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}
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if ((parity_even_bit(dcf77Hour)) != parityBitHour) {
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parityStat = 0;
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}
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if (((parity_even_bit(dcf77DayOfMonth) + parity_even_bit(dcf77DayOfWeek)
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+ parity_even_bit(dcf77Month) + parity_even_bit(dcf77Year)) % 2) != parityBitDate)
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{
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parityStat = 0;
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}
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if (dcf77MinuteEiner > 9) {
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parityStat = 0;
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}
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if (dcf77MinuteZehner > 5) {
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parityStat = 0;
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}
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if (dcf77HourEiner > 9) {
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parityStat = 0;
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}
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if (dcf77HourZehner > 2) {
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parityStat = 0;
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}
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if (dcf77Hour == 0 && dcf77Minute == 0) {
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parityStat = 0;
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}
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}
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unsigned int rawByteToInt(byte raw) {
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return ((raw >> 4) * 10 + (raw & 0x0F));
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}
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