#!/bin/bash
#
#    weather.wunderground
#
# By: Jay Nugent  WB8TKL
# Dated: 120923
# Previous: 120918
#
# This script is launched by cron every 5 minutes.
# It reads the ADS-WS1 weather station via /dev/ttyS0 @ 2400 baud.
# Parses the received string and builds a string in WUNDERGROUND format.
# Sends that string to weatherstation.wunderground.com via the WGET utility.
#
#

# Set to 0 to run quietly under cron (login and data are sent to the WUNDERGROUND server)
# Set to 1 to run in the forground and output to the screen (nothing is sent to WUNDERGROUND)
TEST=0

#
# --- start of locally specific parameters ---
XVERS="ADS-WS1%20bash%20script"

# WUNDERGROUND user ID
LUSER="KMIYPSIL10"

# WUNDERGROUND password
LPASS="oohnoo111"

# Correction factor for the barometric pressure.  
# Adjust as needed for your own altitude.
# example:  20  -8.6
BAROFIX=20

# Serial port that ADS-WS1 is attached to
PORT=/dev/ttyS0

#--- end locally specific parameters ---

# Set up serial port
/bin/stty -F $PORT 2400 raw cs8 -echo -ignpar -cstopb

#==================================================
#     M A I N    L O O P
#==================================================
while true; do

# Read the date string from the serial port
  read ADSWS1 < $PORT
  ADSWS1="${ADSWS1#!!}" # strip !! chars
  ADSLEN=${#ADSWS1} # get string length

# Check for correct length
  if ((ADSLEN == 49)); then
  # Continue with the report
  # else is near the bottom of this script..........

# UTC date
# format:  dateutc - [YYYY-MM-DD HH:MM:SS (mysql format)] 
# example: 2000-01-01+10%3A32%3A35
DDAY=`date -u +%Y-%m-%d"+"%H":"%M":"%S`

#==================================================
# Parse the $ADSWS1 data string and build a set of 
# formatted variables that we can use later
#==================================================

  TEMPFLT=$(printf "%.1f" $(echo "$[0x${ADSWS1:8:4}] * 0.1" | bc)) # floating point result
  TEMPDEC=$(printf "%.0f" $(echo "$[0x${ADSWS1:8:4}] * 0.1" | bc)) # integer result

#-----

  HUMIDITY=$(printf "%.0f" $(echo "$[0x${ADSWS1:24:4}] * 0.1" | bc))
   
#-----

  DEWPOINT=$(printf "%0.f" $(echo "$TEMPDEC - (9 * (100 - $HUMIDITY))/25" | bc))

#-----

  PRESMB=$(printf "%.1f" $(echo "$[0x${ADSWS1:16:4}] * 0.1" | bc)) # pressure in millibars
  # Add a correction factor for your site's altitude
  PRESCOR=$(printf "%.1f" $(echo "$PRESMB+$BAROFIX" | bc)) # corrected pressure (mb)
  # 1 millibar = 0.0295333727 inHg
  INHG=$(printf "%.2f" $(echo "$PRESCOR * 0.0295333727" | bc)) # corrected pres in inches of Hg

###  LBARO=$(printf "%00005i" $(echo "$PRESCOR * 10" | bc))   # multiplied by 10

#-----

  KPH=$(printf "%.1f" $(echo "$[0x${ADSWS1:0:4}] * 0.1" | bc)) # wind speed in Kilometers/Hr
  MPH=$(printf "%.1f" $(echo "$KPH * 0.621371" | bc)) # floating point result
  LWSPEED=$(printf "%003i" $(echo "$KPH * 0.621371" | bc)) # integer result in MPH

#-----

  # Wind dir calculated in degrees
  LWDIR=$(printf "%003i" $(echo "$[0x${ADSWS1:6:2}] * 1.411764" | bc))

#-----

# wind gust MPH (last 5 minutes)
LWGUST="..."

#-----
# rain, last 24 hours
  LRAIN24=$(printf "%003i" $(echo "$[0x${ADSWS1:40:4}] * 1" | bc))

#-----

# rain, last hour (in 100'ths of inches)
LRAIN="..."

#-----

# rain, since local (!) midnight
LRAINM="..."


#========================================
# Assemble into WUNDERGROUND format
#========================================

### rainin - [rain in]
###dailyrainin - [daily rain in accumulated]


WUREPORT="\
ID=${LUSER}\
&PASSWORD=${LPASS}\
&dateutc=${DDAY}\
&tempf=${TEMPFLT}\
&humidity=${HUMIDITY}\
&dewptf=${DEWPOINT}\
&baromin=${INHG}\
&winddir=${LWDIR}\
&windspeedmph=${LWSPEED}\
&dailyrainin=${LRAIN24}\
&softwaretype=${XVERS}\
&action=updateraw"

### leftovers.........
##&windgustmph=\
##&rainin=\
##&weather=\
##&clouds=\


#========================================
# Send to the WUNDERGROUND server
#========================================

if ((TEST == 0)); then
   # -nv non-verbose, -O - output to STDOUT instead of to a file
   wget -nv -O - "http://weatherstation.wunderground.com/weatherstation/updateweatherstation.php?${WUREPORT}"
fi


#=============================================
# Or if the TEST flag is set, just output to 
# the screen and do not send to WUNDERGROUND
#=============================================

if ((TEST == 1)); then
# ...do the following for testing...
   echo " "
   echo " "
   echo "   What we received from the ADS-WS1 via the serial port:"
   echo $ADSWS1
   echo " "
   echo "   Values that were parsed and formatted:"
   echo 'YYYYMMDD HH:MM:SS (UTC)        dateutc : '$DDAY
   echo 'Wind Direction                 winddir : '$LWDIR' Deg'
   echo 'Wind Speed                windspeedmph : '$LWSPEED' MPH   '
   echo 'Wind Speed (2min avg) windspdmph_avg2m : -none-'
   echo 'Wind Gust (5min)          windgustmph  : -none-'
   echo 'Temperature                      tempf : '$TEMPFLT' F   '
   echo '1-hour Rainfall                 rainin : -none-'
   echo 'Daily Rainfall             dailyrainin : '$LRAIN24' inches'
   echo 'Humidity                      humidity : '$HUMIDITY' %'
   echo 'Dew Point                       dewptf : '$DEWPOINT' F  '
   echo 'Pressure                       baromin : '$INHG' inHG '
   echo 'Station Hardware                       : '$XVERS
   echo " "
   echo "   What we will send to the WUNDERGROUND collector:"
   echo -e ${WUREPORT}
   echo " "
#
fi

# We run only once... so exit cleanly...
exit 0

#==================================================
   else
      echo " "
      echo "String received was wrong length - $ADSLEN"
   fi
#
done
exit 0
#
# --- exit ---
#
#