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micooke / WWVB

Arduino WWVB Transmitter for Attiny85, nano, micro etc.
MIT License
30 stars 5 forks source link

Too many big words Charlie #5

Closed micooke closed 8 years ago

micooke commented 8 years ago

Minimum.ino is working but Nano_with_gps.ino and nano_with_gps2.ino are all over the place with pulse widths and are unable to be calibrated.

The issue is the gps parsing overhead that was added. I need to look into this, it may mean a two chip solution is required?

mr-sneezy commented 8 years ago

Feedback: Tried the late Nano_with_GPS2.ino, also pulled down the AtTinyGPS stuff so it compiled.

Got this from the serial terminal over a minute or so Waiting on first GPS sync error : NMEA string $GPTXT is not supported error : NMEA string $GPTXT is not supported .......error : NMEA string $bb’ is not supported ...error : NMEA string $lbb’ is not supported .............................error : NMEA string $ŒŽrl is not supported ........error : NMEA string $ bpœ is not supported .error : NMEA string $�bŒbl is not supported ....error : NMEA string $ŒŽrl is not supported ..............error : NMEA string $lbnŽŒ is not supported ..................error : NMEA string $ŒŽbbb is not supported .........................error : NMEA string $ŒŽrl is not supported ..error : NMEA string $ b‚p is not supported .....error : NMEA string $ì�’� is not supported .....error : NMEA string $rrƒbì is not supported .................error : NMEA string $ì �Œ is not supported .......error : NMEA string $rr‚bì is not supported ...............

micooke commented 8 years ago

First things first - im changing this back to 9600 BAUD as some GPS units dont support 14400 BAUD.

As discussed - that issue is because some ublox GPS units dont accept PMTK command strings :-1: . I do have a thought on that though - do a raw capture of the strings sent from u-connect when from you:

  1. send RMC & GGA only
  2. 1Hz update rate (or slower)

I think ive sorted out my issue - the interrupt was taking too long because of the processing overhead, so i have changed it a very small amount so that i dont need to do cli() before it (then sei() after).

micooke commented 8 years ago

Because of this bugfix :-1: the calibration i completed using minimum.ino is incorrect now

mr-sneezy commented 8 years ago

More feedback. This is from Nano_with_GPS2. Looks more promising.

Waiting on first GPS sync .................. GPS synced!

GPS SYNCED

IsValid : 1 Quality : 1 Satellites : 9 Date/Time : 05:53 on 14/02/2016 WWVB transmit started

mr-sneezy commented 8 years ago

WWVB & Clocks output_250 kHz, 2 M Samples [7].zip

mr-sneezy commented 8 years ago

Added a Saleae capture of both the Nano's WWVB pin and a voltage boosted inverted (via a BC549 tranny) signal from the test clocks RX pin.

At this point in time I have not had a successful time sync on the clock with Nano_with_GPS2 (but did with minimum.ino. I guess there is still a timing issue on the WWVB.

micooke commented 8 years ago

I think i can safely close this with the latest update :smile: