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read_gps_and_sensehat.py
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read_gps_and_sensehat.py
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#!/usr/bin/python
import serial
import pynmea2
#to display on Sense Hat device
from sense_hat import SenseHat
from datetime import datetime
#globals
# to hold data for GPS
lat = 0
lon = 0
alt = 0
numsats = 0
speed = 0
sensehatboard = SenseHat()
# contiuosly read the serial port
with serial.Serial('/dev/ttyS0', baudrate=9600, timeout=1) as ser:
# read 10 lines or WHILE loop to read data from the /dev/ttyS0 GPS on the UART
while(1):
try:
serial_data_line = ser.readline().decode('ascii', errors='replace')
GPS_Line = serial_data_line.strip(' ')
#print "Read :", GPS_Line
except Exception as e:
#print "serial port exception"
#ignored
pass
try:
#decoded = pynmea2.parse(' $GPRMC,223114.000,A,4733.8824,N,12206.4382,W,0.06,275.93,050317,,,A*78')
#decoded = pynmea2.parse(' $GPVTG,32.80,T,,M,0.08,N,0.16,K,A*0B')
#decoded = pynmea2.parse(' $GPGGA,032222.000,4733.8736,N,12206.4312,W,1,08,0.85,214.3,M,-17.3,M,,*5E')
# check the first 6 characters of the input data line from the GPS to see how to parse it
GPS_Prefix = GPS_Line[0:6]
if (GPS_Prefix == '$GPGSA'):
#class GPGSA(NMEASentence):
# def __init__(self):
# parse_map = (
# ('Mode', 'mode'),
# ('Mode fix type', 'mode_fix_type'),
# ('SV ID01', 'sv_id01'),
# ('SV ID02', 'sv_id02'),
# ('SV ID03', 'sv_id03'),
# ('SV ID04', 'sv_id04'),
# ('SV ID05', 'sv_id05'),
# ('SV ID06', 'sv_id06'),
# ('SV ID07', 'sv_id07'),
# ('SV ID08', 'sv_id08'),
# ('SV ID09', 'sv_id09'),
# ('SV ID10', 'sv_id10'),
# ('SV ID11', 'sv_id11'),
# ('SV ID12', 'sv_id12'),
# ('PDOP (Dilution of precision)', 'pdop'),
# ('HDOP (Horizontal DOP)', 'hdop'),
# ('VDOP (Vertical DOP)', 'vdop'))
# #('Checksum', 'checksum'))
#
# super(GPGSA, self).__init__(parse_map)
decoded = pynmea2.parse(GPS_Line)
elif (GPS_Prefix == '$GPRMC'):
#class GPRMC(NMEASentence):
# """ Recommended Minimum Specific GPS/TRANSIT Data
# """
# def __init__(self):
# parse_map = (("Timestamp", "timestamp"),
# ("Data Validity", "data_validity"),
# ("Latitude", "lat"),
# ("Latitude Direction", "lat_dir"),
# ("Longitude", "lon"),
# ("Longitude Direction", "lon_dir"),
# ("Speed Over Ground", "spd_over_grnd"),
# ("True Course", "true_course"),
# ("Datestamp", "datestamp"),
# ("Magnetic Variation", "mag_variation"),
# ("Magnetic Variation Direction", "mag_var_dir"))
# #("Checksum", "checksum"))
# super(GPRMC, self).__init__(parse_map)
decoded = pynmea2.parse(GPS_Line)
#print "LAT:", decoded.lat,
#print "LON:", decoded.lon
lat = decoded.lat
lon = decoded.lon
elif (GPS_Prefix == '$GPVTG'):
# class GPVTG(NMEASentence):
# """ Track Made Good and Ground Speed
# ("True Track made good", "true_track"),
# ("True Track made good symbol", "true_track_sym"),
# ("Magnetic Track made good", "mag_track"),
# ("Magnetic Track symbol", "mag_track_sym"),
# ("Speed over ground knots", "spd_over_grnd_kts"),
# ("Speed over ground symbol", "spd_over_grnd_kts_sym"),
# ("Speed over ground kmph", "spd_over_grnd_kmph"),
# ("Speed over ground kmph symbol", "spd_over_grnd_kmph_sym"))
decoded = pynmea2.parse(GPS_Line)
#print "SPKM:",decoded.spd_over_grnd_kmph
speed = decoded.spd_over_grnd_kmph
elif (GPS_Prefix == '$GPGGA'):
#class GPGGA(NMEASentence):
# def __init__(self):
# parse_map = (
# ('Timestamp', 'timestamp'),
# ('Latitude', 'latitude'),
# ('Latitude Direction', 'lat_direction'),
# ('Longitude', 'longitude'),
# ('Longitude Direction', 'lon_direction'),
# ('GPS Quality Indicator', 'gps_qual'),
# ('Number of Satellites in use', 'num_sats'),
# ('Horizontal Dilution of Precision', 'horizontal_dil'),
# ('Antenna Alt above sea level (mean)', 'antenna_altitude'),
# ('Units of altitude (meters)', 'altitude_units'),
# ('Geoidal Separation', 'geo_sep'),
# ('Units of Geoidal Separation (meters)', 'geo_sep_units'),
# ('Age of Differential GPS Data (secs)', 'age_gps_data'),
# ('Differential Reference Station ID', 'ref_station_id'))
# #('Checksum', 'checksum'))
#
# super(GPGGA, self).__init__(parse_map)
decoded = pynmea2.parse(GPS_Line)
#print "ALT:",decoded.altitude
alt = decoded.altitude
elif (GPS_Prefix == '$GPGSV'):
#class GPGSV(NMEASentence):
# def __init__(self):
# parse_map = (
# ('Number of messages of type in cycle', 'num_messages'),
# ('Message Number', 'msg_num'),
# ('Total number of SVs in view', 'num_sv_in_view'),
# ('SV PRN number 1', 'sv_prn_num_1'),
# ('Elevation in degrees 1', 'elevation_deg_1'), # 90 max
# ('Azimuth, deg from true north 1', 'azimuth_1'), # 000 to 159
# ('SNR 1', 'snr_1'), # 00-99 dB
# ('SV PRN number 2', 'sv_prn_num_2'),
# ('Elevation in degrees 2', 'elevation_deg_2'), # 90 max
# ('Azimuth, deg from true north 2', 'azimuth_2'), # 000 to 159
# ('SNR 2', 'snr_2'), # 00-99 dB
# ('SV PRN number 3', 'sv_prn_num_3'),
# ('Elevation in degrees 3', 'elevation_deg_3'), # 90 max
# ('Azimuth, deg from true north 3', 'azimuth_3'), # 000 to 159
# ('SNR 3', 'snr_3'), # 00-99 dB
# ('SV PRN number 4', 'sv_prn_num_4'),
# ('Elevation in degrees 4', 'elevation_deg_4'), # 90 max
# ('Azimuth, deg from true north 4', 'azimuth_4'), # 000 to 159
# ('SNR 4', 'snr_4')) # 00-99 dB
# #('Checksum', 'checksum'))
#
# super(GPGSV, self).__init__(parse_map)
#satellites in view
decoded = pynmea2.parse(GPS_Line)
#print "#SATS:", decoded.num_sv_in_view
numsats = decoded.num_sv_in_view
except Exception as e:
print "Error decoding :", serial_data_line
#so ignore it if cant decode it
pass
print "LAT:",lat ,"LON:",lon,"ALT:",alt,"#NUMSATS:",numsats,"SPEED:",speed
t = sensehatboard.get_temperature()
p = sensehatboard.get_pressure()
h = sensehatboard.get_humidity()
t = round(t, 1)
p = round(p, 1)
h = round(h, 1)
#print(datetime.now())
msg = "Temperature = {0}, Pressure = {1}, Humidity = {2}".format(t,p,h)
#sensehatboard.show_message(msg, scroll_speed=0.01)
print(datetime.now()), ('Temperature: {0} Pressure: {1} Humidity: {2}'.format(t,p,h))