Thanks for sharing the code, but I had nearly no chance to retrieve a clean signal from the conrad DCF77 receiver. Every 3 to 4 seconds the debug information shows several short signals before the 100ms and 200ms signals. I’ve modified the interrupthandler to ignore the jitter:

/**
* Interrupthandler for INT0 – called when the signal on Pin 2 changes.
*/
void int0handler() {
int length = millis() – previousFlankTime;
if (length < 10) {
// ignore jitter
return;
}
// check the value again – since it takes some time to
// activate the interrupt routine, we get a clear signal.
DCFSignalState = digitalRead(DCF77PIN);
}

and removed the DCFSignalState assignment in the main loop.

The problem concerning TCCR2 can be easily solved via the MsTimer2 Library. Changing the interrupt initialisation to:

/**
* Initialize the DCF77 routines: initialize the variables,
* configure the interrupt behaviour.
*/
void DCF77Init() {
previousSignalState=0;
previousFlankTime=0;
bufferPosition=0;
dcf_rx_buffer=0;
ss=mm=hh=day=mon=year=0;
#ifdef DCF_DEBUG
Serial.println("Initializing DCF77 routines");
Serial.print("Using DCF77 pin #");
Serial.println(DCF77PIN);
#endif
pinMode(BLINKPIN, OUTPUT);
pinMode(DCF77PIN, INPUT);

#ifdef DCF_DEBUG
Serial.println("Initializing timerinterrupt");
#endif
MsTimer2::set(1000, advanceClock); // 500ms period

#ifdef DCF_DEBUG
Serial.println("Initializing DCF77 signal listener interrupt");
#endif
attachInterrupt(0, int0handler, CHANGE);
}

removing the old interrupthandler and added the advanceClock function:

/**
* The interrupt routine for counting seconds – increment hh:mm:ss.
*/
void advanceClock() {
ss++;
if (ss==60) {
ss=0;
mm++;
if (mm==60) {
mm=0;
hh++;
if (hh==24)
hh=0;
}
}
}

The timer is started in "Parity check OK – updating time" branch via MsTimer2::start(). The sideeffect of placing the MsTimer2::start after a positive parity check is that the time is only printed after successful decoding of the DCF77 Data.

I'll mail you the complete sketch for integrating the changes in a version 0.0.3

Best regards

In function ‘void DCF77Init()’:
error: ‘TCCR2′ was not declared in this scope

I use also the latest enviroment 0017
What have you done so that it runs the program?

Thanks a lot for your help,

Willy

I’m using Nano-Board and also Arduino-Software version 0017.

int TIMSK;
int TCCR2;
int OCIE2;

So far with my reciever that i got today i have not got it working but its most likely my fault.
Rory

I just found your latest code on the project. but sadly I still can’t make it work with my diecimila >

In function ‘void DCF77Init()’:
error: ‘TCCR2′ was not declared in this scope

I use the latest enviroment 0017 – is this a problem?

Thanks a lot,
Stefan

versuche mich auch gerade darin, Deine DCF77 Software auf meinen Arduino zu übertragen.
Leider habe auch ich einen Fehler beim Compilieren, weil TCCR2 nicht definiert ist.
Liegt das an V017 der Arduino Software?

I have an Arduino Duemilanove ATMEGA 328 and no idea on the diff with 168…

Pb whith TCCR2 at compile…

Thanks.