трекер gps signal not found
Трекер gps signal not found
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Статьи по фразе трекер gps signal not found
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A Compact Arduino GPS/NMEA Parser
TinyGPS is designed to provide most of the NMEA GPS functionality I imagine an Arduino user would want – position, date, time, altitude, speed and course – without the large size that seems to accompany similar bodies of code. To keep resource consumption low, the library avoids any mandatory floating point dependency and ignores all but a few key GPS fields.
To use, simply create an instance of an object like this:
You can then query the object to get various tidbits of data. To test whether the data returned is stale, examine the (optional) parameter “fix_age” which returns the number of milliseconds since the data was encoded.
- chars – the number of characters fed to the object
- sentences – the number of valid $GPGGA and $GPRMC sentences processed
- failed_checksum – the number of sentences that failed the checksum test
Using Floating Point
For more convenient access to date/time use this:
Establishing a fix
TinyGPS objects depend on an external source, i.e. its host program, to feed valid and up-to-date NMEA GPS data. This is the only way to make sure that TinyGPS’s notion of the “fix” is current. Three things must happen to get valid position and time/date:
- You must feed the object serial NMEA data.
- The NMEA sentences must pass the checksum test.
- The NMEA sentences must report valid data. If the $GPRMC sentence reports a validity of “V” (void) instead of “A” (active), or if the $GPGGA sentence reports fix type “0″ (no fix) then those sentences are discarded.
Interfacing with Serial GPS
- initial version
- << streaming, supports $GPGGA for altitude, floating point inline functions
- also extract lat/long/time from $GPGGA for compatibility with devices with no $GPRMC
- bug fixes
- API re-org, attach separate fix_age’s to date/time and position.
- Prefer encode() over operator<<. Encode() returns boolean indicating whether TinyGPS object has changed state.
- Changed examples to use NewSoftSerial in lieu of AFSoftSerial; rearranged the distribution package.
- Greater precision in latitude and longitude. Angles measured in 10-5 degrees instead of 10-4 as previously. Some constants redefined.
- Minor bug fix release: the fix_age parameter of get_datetime() was not being set correctly.
- Added Maarten Lamers’ distance_to() as a static function.
- Arduino 1.0 compatibility
- Added satellites(), hdop(), course_to(), and cardinal()
- Improved precision in latitude and longitude rendering. get_position() now returns angles in millionths of a degree.
All input is appreciated.
Peace of Mind
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Видео по фразе трекер gps signal not found
Что Вы можете найти на YouTube:Как настроить GPS трекер BZ31