Interfacing GPS with 8051
- 1. Interfacing GPS with 8051 Done by, S.Praveenkumar-15E137 T.Rajesh-15E141 Ranjith kumar-15E143
- 2. Objective of this project • The Latitude and longitude values are extracted from the data in NMEA format the GPS module and display it in the LCD display. • To extract time information and convert it to IST format and display it in the LCD. • To extract date information and display it in the LCD.
- 3. Components used • GPS module (GY-NEO6MV2) • 8051 microcontroller • 16*2 LCD display • Few switches
- 4. How Does GPS Work • GPS receivers use a constellation of satellites and ground stations to compute position and time almost anywhere on earth. • The primary purpose of the 12 visible satellites is to transmit information back to earth over radio frequency (ranging from 1.1 to 1.5 GHz). With this information and some math, a ground based receiver or GPS module can calculate its position and time.
- 5. Working • . If the GPS receiver’s antenna can see at least 4 satellites, it can accurately calculate its position and time. This is also called a lock or a fix. • To configure a GPS receiver, knowing the type of chipset your GPS is using is very important. The GPS chipset contains a powerful processor that is responsible for the user interface, all of the calculations, as well as analog circuitry for the antenna. • The chipset also allows for data to be sent to the GPS receiver to configure parameters like, update rate, baud rate, sentence selection, etc.
- 6. Message Formats • GPS data is displayed in different message formats over a serial interface. • Nearly all GPS receivers output NMEA data. The NMEA standard is formatted in lines of data called sentences. • Each sentence contains various bits of data organized in comma delimited format (i.e. data separated by commas). $GPRMC,062521.004,A,5404.2675,N,00159.7569,W,000.0,000.0,061017,,,A*78 $GPGGA,062521.004,5404.2675,N,00159.7569,W,1,10,4.00,100.0,M,50.0,M,,*7A $GPGSA,A,3,13,11,20,28,14,18,16,21,22,19,,,4.00,3.20,2.40*0B
- 7. Extraction of Latitude and Longitude values from NMEA Format • The first received 6 characters from GPS module are compared with string $GPRMC, if matched then will go for further process otherwise repeat the same process again. • If string is matched then wait till you will get two 2 commas, next character indicates weather the GPS is activated or not. • If this character is A then GPS is activated otherwise GPS is not activated. Now again wait till you get comma (,). • The next 9 characters indicate the LATITUDE. Wait till you get 2 more commas (,) the next 10 characters indicates the LONGITUDE. • This data is sent out on the serial port at an interval called the update rate.
- 8. Message Formats Obtaining data from the string $GPRMC Time: 144818.317 is 14.48 and 18.317 seconds in Greenwich mean time Latitude: 5404.2675,N is latitude in degrees.decimal minutes, north Longitude: 0159.7569,W is longitude in degrees.decimal minutes, west Date:051017 is 05.10.17 Number of satellites seen: 10 Altitude: 100 meters
- 9. CIRCUIT
- 10. Output from VGPS
- 11. Displaying LAT & LON
- 12. Displaying TIME
- 13. Displaying DATE
- 14. Circuit Applications: • Used in tracking devices and mapping devices • Used in personal positioning • Date and time monitoring • This project is used in embedded system applications to find out the location. • VR games.
- 16. Thank you!!