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September 14, 2020 19:15
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/* | |
Getting the time and date in your timezone using Ublox commands | |
Originally Written By: davidallenmann | |
Modified By: Ho Yun "Bobby" Chan | |
SparkFun Electronics | |
Date: April 16th, 2019 | |
License: MIT. See license file for more information but you can | |
basically do whatever you want with this code. | |
This is a modified example that shows how to query a Ublox module for the current time and date. We also | |
turn off the NMEA output on the I2C port. This decreases the amount of I2C traffic | |
dramatically. | |
Leave NMEA parsing behind. Now you can simply ask the module for the datums you want! | |
Additionally, this code has the option to adjust the UTC date and time. The time is adjusted by manually | |
entering your time zone's offset. The Daylight Savings Time is automatically calculated with the help of | |
Nathan Seidle's Daylight Savings Time example [ https://github.com/nseidle/Daylight_Savings_Time_Example ]. | |
However, if your country does not observe DST, you can override it with the `enableDST` variable. | |
The output for this example is sent through a Serial UART port. Depending on personal preference, you can view | |
the time in regular 12-hour format or miltary 24-hour format. | |
Feel like supporting open source hardware? | |
Buy a board from SparkFun! | |
ZED-F9P RTK2: https://www.sparkfun.com/products/15136 | |
NEO-M8P RTK: https://www.sparkfun.com/products/15005 | |
SAM-M8Q: https://www.sparkfun.com/products/15106 | |
Hardware Connections: | |
Plug a Qwiic cable into the u-Blox Qwiic-enabled GPS and the RedBoard Qwiic. | |
If you don't have a platform with a Qwiic connection use the SparkFun Qwiic Breadboard Jumper (https://www.sparkfun.com/products/14425) | |
Open the serial monitor at 115200 baud to see the output. | |
*/ | |
#include <Wire.h> //Needed for I2C to GPS | |
#include "SparkFun_Ublox_Arduino_Library.h" //http://librarymanager/All#SparkFun_Ublox_GPS | |
SFE_UBLOX_GPS myGPS; | |
long lastTime = 0; //Simple local timer. Limits amount if I2C traffic to Ublox module. | |
long latitude = 0; | |
long longitude = 0; | |
long altitude = 0; | |
byte SIV = 0; | |
boolean DST = false; //adjust for Daylight Savings Time, this is calculated automatically. fall back = FALSE, spring forward = TRUE | |
boolean enableDST = true; //option to disable DST if your country does not observe DST | |
int zoneOffsetHour = -7; //adjust according to your standard time zone | |
byte DoW = 0; //needed to adjust hour for DST, or if you want to know the Day of the Week | |
boolean military = false; //adjust for miltary or AM/PM | |
boolean AM = false; //AM or PM? | |
// Use these variables to set the initial time: 3:03:00 | |
int hours = 3; | |
int minutes = 3; | |
int seconds = 0; | |
//Tid Bit: https://www.sparkfun.com/news/2571#yearOrigin | |
int years = 2003; //year that SparkFun was founded! | |
int months = 1; //month that SparkFun was founded! | |
int days = 3; //day that SparkFun was founded! | |
// How fast do you want the clock to update? Set this to 1 for fun. | |
// Set this to 1000 to get _about_ 1 second timing. | |
const int CLOCK_SPEED = 1000; | |
unsigned long lastDraw = 0; | |
void setup(){ | |
Serial.begin(115200); | |
//while (!Serial) | |
// ; //Wait for user to open terminal | |
Serial.println(F("SparkFun Ublox Example")); | |
Wire.begin(); | |
Wire.setClock(400000); // Set clock speed to be the fastest for better communication (fast mode) | |
if (myGPS.begin() == false) //Connect to the Ublox module using Wire port | |
{ | |
Serial.println(F("Ublox GPS not detected at default I2C address. Please check wiring. Freezing.")); | |
while (1) | |
; | |
} | |
myGPS.setI2COutput(COM_TYPE_UBX); //Set the I2C port to output UBX only (turn off NMEA noise) | |
myGPS.saveConfiguration(); //Save the current settings to flash and BBR | |
}//end setup() | |
void loop(){ | |
update_Time(); //adjust UTC date/time based on time zone and DST | |
displayDigital_Date_Time(); //after calculating, display the date and time | |
} //end loop | |
// Simple function to increment seconds and then increment minutes | |
// and hours if necessary. | |
void update_Time() { | |
//Query module only every second. Doing it more often will just cause I2C traffic. | |
//The module only responds when a new position is available | |
if (millis() - lastTime > 1000) { | |
lastTime = millis(); //Update the timer | |
latitude = myGPS.getLatitude(); | |
longitude = myGPS.getLongitude(); | |
altitude = myGPS.getAltitude(); | |
SIV = myGPS.getSIV(); | |
years = myGPS.getYear(); | |
months = myGPS.getMonth(); | |
days = myGPS.getDay(); | |
hours = myGPS.getHour(); | |
minutes = myGPS.getMinute(); | |
seconds = myGPS.getSecond(); | |
calcZone_DST(); //adjust zone and used to check if it is Daylight Savings Time | |
} | |
//Serial.print(F("Lat: ")); | |
//Serial.print(latitude); | |
//Serial.print(F(" Long: ")); | |
//Serial.print(longitude); | |
//Serial.print(F(" (degrees * 10^-7)")); | |
//Serial.print(F(" Alt: ")); | |
//Serial.print(altitude); | |
//Serial.print(F(" (mm)")); | |
//Serial.print(F(" SIV: ")); | |
//Serial.print(SIV); | |
//Serial.println(); | |
} | |
//Nate's snazzy code! | |
//Given a year/month/day/current UTC/local offset give me local time | |
void calcZone_DST() { | |
//Since 2007 DST starts on the second Sunday in March and ends the first Sunday of November | |
//Let's just assume it's going to be this way for awhile (silly US government!) | |
//Example from: http://stackoverflow.com/questions/5590429/calculating-daylight-savings-time-from-only-date | |
DoW = day_of_week(); //Get the day of the week. 0 = Sunday, 6 = Saturday | |
int previousSunday = days - DoW; | |
//DST = false; //Assume we're not in DST | |
if (enableDST == true) { | |
if (months > 3 && months < 11) DST = true; //DST is happening! | |
//In March, we are DST if our previous Sunday was on or after the 8th. | |
if (months == 3) | |
{ | |
if (previousSunday >= 8) DST = true; | |
} | |
//In November we must be before the first Sunday to be DST. | |
//That means the previous Sunday must be before the 1st. | |
if (months == 11) | |
{ | |
if (previousSunday <= 0) DST = true; | |
} | |
} | |
//adjust time for DST here if it applies to your region | |
if (DST == true) {//adjust time Daylight Savings Time | |
hours = hours + 1; | |
} | |
else { //leave time as is for Daylight Time | |
} | |
//adjust time based on Time Zone | |
hours = hours + zoneOffsetHour; | |
//adjust for offset zones when hour is negative value | |
if (hours < 0) { | |
days = days - 1; | |
hours = hours + 24; | |
} | |
else if ( hours > 23) { | |
days = days + 1; | |
hours = hours - 24; | |
} | |
//adjust for AM/PM mode | |
if (military == false) { | |
if (hours >= 0 && hours <= 11) {// we are in AM | |
if (hours == 0) { | |
hours = 12; | |
} | |
AM = true; | |
} | |
else { // hours >= 12 && hours <= 23, therefore we are in PM!!! | |
if (hours > 12 && hours <= 23) { | |
hours = hours - 12; | |
} | |
AM = false; | |
} | |
} | |
/* | |
Serial.print("Hour: "); | |
Serial.println(hour); | |
Serial.print("Day of week: "); | |
if(DoW == 0) Serial.println("Sunday"); | |
if(DoW == 1) Serial.println("Monday"); | |
if(DoW == 2) Serial.println("Tuesday"); | |
if(DoW == 3) Serial.println("Wednesday"); | |
if(DoW == 4) Serial.println("Thursday"); | |
if(DoW == 5) Serial.println("Friday!"); | |
if(DoW == 6) Serial.println("Saturday"); | |
*/ | |
} | |
//Given the current year/month/day | |
//Returns 0 (Sunday) through 6 (Saturday) for the day of the week | |
//From: http://en.wikipedia.org/wiki/Calculating_the_day_of_the_week | |
//This function assumes the month from the caller is 1-12 | |
char day_of_week() { | |
//Devised by Tomohiko Sakamoto in 1993, it is accurate for any Gregorian date: | |
static int t[] = { 0, 3, 2, 5, 0, 3, 5, 1, 4, 6, 2, 4 }; | |
years -= months < 3; | |
return (years + years / 4 - years / 100 + years / 400 + t[months - 1] + days) % 7; | |
} | |
void displayDigital_Date_Time() { | |
if (lastDraw + CLOCK_SPEED < millis()) | |
{ | |
lastDraw = millis(); | |
Serial.print(F("Date: ")); | |
if (months <= 9) { | |
Serial.print(F(" ")); | |
} | |
Serial.print(String(months) + '-'); | |
if (days <= 9) { | |
Serial.print(F("0")); | |
} | |
Serial.println(String(days) + '-' + String(years)); | |
Serial.print(F("Time: ")); | |
if (hours <= 9) { | |
Serial.print(' '); | |
} | |
Serial.print(String(hours) + ':' ); | |
if (minutes <= 9) { | |
Serial.print(F("0")); | |
} | |
Serial.print(String(minutes) + ':'); | |
if (seconds <= 9) { | |
Serial.print(F("0")); | |
} | |
Serial.print(String(seconds)); | |
if (military == false) { | |
if (AM == true) { | |
Serial.println(F(" AM")); | |
} | |
else { | |
if (AM == false) { | |
Serial.println(F(" PM")); | |
} | |
} | |
} | |
else { | |
Serial.println(); //space between military time for Serial Monitor | |
} | |
if (myGPS.getDateValid() == false) { | |
Serial.println(F("Date is invalid, not enough satellites in view!")); | |
} | |
if (myGPS.getTimeValid() == false) { | |
Serial.println(F("Time is invalid, not enough satellites in view!")); | |
} | |
Serial.println(); | |
} | |
} |
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