micooke
commented
7 years ago Yeah im Australian, no wwvb here either!
Thanks for pointing me to that library, its actually a similar approach to what my new wwvb_jjy library is taking - but i use a union to access the bits as a buffer, jjy or wwvb. Interesting that it syncs on your watch, i will have to test it out against my clock (BALDR brand, same as @mr-sneezy) which arrived yesterday.
Also, i ordered that exact dds board a week ago so should be able to use the same test setup (when it eventually arrives). My library has worked with desk clocks, but not watches - i had been wondering if this is because the arduino outputs a 0 to 5v square wave instead of a -5 to 5v sine, looks like it may.
Ill have a look at that library and get back to you. In the meantime, if you wanted to test against an early release have a look at the tx example in my wwvb_jjy library. It requires my pwm library. Initialise the dds in setup, turn it off in the overflow isr and turn it on in the compare isr.
Cheers
RoLorenzoni
baradhili
Hi! I am new with programming, but I found your project really interesting. I live in a country that does not have the time signal available, so I have no other choice but constructing a transmitter. I tried your "minimal" project but it wasn't able to set my citizen watches. The Rx indicator shows some signal reception but it always fails. Then I got a AD9850 DDS RF generator and it's really easy to create a sine 60khz carrier. Changing a WWVB sample code from vinmarshall (https://github.com/vinmarshall/WWVB-Clock), I could generate a WWVB signal that was correctly received by the watches. Now, I'm trying to combine the ad9850 code with your wwvb library, but with no sucess. I would be very happy if you could help me with that, because I am new to programming. I am using an arduino nano, a ublox 6 GPS module to get acurate time and the AD9850 to broadcast it. Thanks in advance.
here is the code I used to generate the carrier.
/ WWVB Test Signal v 1.0
*/
include
const int W_CLK_PIN = 7; const int FQ_UD_PIN = 8; const int DATA_PIN = 10; const int RESET_PIN = 11;
double freq = 60000; double trimFreq = 124999500;
int phase = 0;
/* WWVB time format struct - acts as an overlay on wwvbRxBuffer to extract time/date data.
*/
struct wwvbBuffer { unsigned long long U12 :4; // no value, empty four bits only 60 of 64 bits used unsigned long long Frame :1; // framing unsigned long long Dst :2; // dst flags unsigned long long Leapsec :1; // leapsecond unsigned long long Leapyear :1; // leapyear unsigned long long U11 :1; // no value unsigned long long YearOne :4; // year (5 -> 2005) unsigned long long U10 :1; // no value unsigned long long YearTen :4; // year (5 -> 2050) unsigned long long U09 :1; // no value unsigned long long OffVal :4; // offset value unsigned long long U08 :1; // no value unsigned long long OffSign :3; // offset sign unsigned long long U07 :2; // no value unsigned long long DayOne :4; // day ones unsigned long long U06 :1; // no value unsigned long long DayTen :4; // day tens unsigned long long U05 :1; // no value unsigned long long DayHun :2; // day hundreds unsigned long long U04 :3; // no value unsigned long long HourOne :4; // hours ones unsigned long long U03 :1; // no value unsigned long long HourTen :2; // hours tens unsigned long long U02 :3; // no value unsigned long long MinOne :4; // minutes ones unsigned long long U01 :1; // no value unsigned long long MinTen :3; // minutes tens unsigned long long U00 :1; };
// We point the struct and the unsigned long long at the // same memory space so we can access the bits using // both paradigms. struct wwvbBuffer buffer = (struct wwvbBuffer ) malloc(sizeof(struct wwvbBuffer)); unsigned long long timeBits = (unsigned long long ) buffer;
/*
void setup() {
// Setup the Serial port out and the WWVB signal output pin
DDS.begin(W_CLK_PIN, FQ_UD_PIN, DATA_PIN, RESET_PIN); DDS.calibrate(trimFreq);
}
/*
void loop() {
// Print the Date & Time to the Serial port for debugging. int year = (buffer->YearTen 10) + buffer->YearOne; int day = (buffer->DayHun 100) + (buffer->DayTen 10) + buffer->DayOne; int hour = (buffer->HourTen 10) + buffer->HourOne; int minute = (buffer->MinTen * 10) + buffer->MinOne; char date[30]; sprintf(date, "%.2i:%.2i %.3i, 20%.2i\n", hour, minute, day, year); Serial.print(date);
// Step through each bit in this frame int position = 0; for (int i = 63; i >= 4; i--) { // Mask off all bits but the one in question. // This singles out one bit, moving from MSB to LSB unsigned long long mask = (unsigned long long) 1 << i; unsigned long long masked = (*timeBits) & mask;
} Serial.println("");
// Increment the Time and Date if (++(buffer->MinOne) == 10) { buffer->MinOne = 0; buffer->MinTen++; }
if (buffer->MinTen == 6) { buffer->MinTen = 0; buffer->HourOne++; }
}
/*
void sendMark() {
// Send low for 0.8 sec DDS.down(); delay(799);
// Send high for 0.2 sec DDS.setfreq(freq, phase); delay(199);
return; }
/*
void sendWeighted() {
// Send low for 0.5 sec DDS.down(); delay(499);
// Send high for 0.5 sec DDS.setfreq(freq, phase); delay(499);
return; }
/*
void sendUnweighted() {
// Send low for 0.2 sec DDS.down(); delay(199);
// Send high for 0.8 sec DDS.setfreq(freq, phase); delay(799);
return; }