loop.pl

   1 #!/usr/bin/perl
   2 use strict;
   3
   4 use v5.10.1;
   5
   6 use Mojolicious::Lite;
   7 use Serial;
   8 use Mojo::IOLoop;
   9 use Mojo::IOLoop::Stream;
  10 use Mojo::Transaction::WebSocket;
  11 #use Mojo::JSON  qw(decode_json encode_json);
  12 use JSON;
  13 use Debug;
  14 use SMGLog;
  15 use Math::Round qw(nearest);
  16 use File::Copy;
  17 use Data::Random qw(rand_chars);
  18 use IO::File;
  19
  20 use constant pi => 3.14159265358979;
  21
  22 my $devname = "/dev/davis";
  23 my $datafn = ".loop_data";
  24 my $dataf;
  25
  26 my $poll_interval = 2.5;
  27 my $rain_mult = 0.2;                            # 0.1 or 0.2 mm or 0.01 inches
  28 my $tid;
  29 my $rid;
  30 our $did;
  31 my $nlcount;
  32 my $state = "ready";
  33 my $buf;
  34 my $dbg;
  35 my $ser;                                                        # the serial port Mojo::IOLoop::Stream
  36 my $last_min_h;
  37 my $last_hour_h;
  38
  39 our $json = JSON->new->canonical(1);
  40 our $WS = {};                                   # websocket connections
  41
  42 our $ld = {};
  43
  44 our $loop_count;                                # how many LOOPs we have done, used as start indicator
  45
  46 our     @crc_table = (
  47                                   0x0, 0x1021, 0x2042, 0x3063, 0x4084, 0x50a5, 0x60c6, 0x70e7,
  48                                   0x8108, 0x9129, 0xa14a, 0xb16b, 0xc18c, 0xd1ad, 0xe1ce, 0xf1ef,
  49                                   0x1231, 0x210, 0x3273, 0x2252, 0x52b5, 0x4294, 0x72f7, 0x62d6,
  50                                   0x9339, 0x8318, 0xb37b, 0xa35a, 0xd3bd, 0xc39c, 0xf3ff, 0xe3de,
  51                                   0x2462, 0x3443, 0x420, 0x1401, 0x64e6, 0x74c7, 0x44a4, 0x5485,
  52                                   0xa56a, 0xb54b, 0x8528, 0x9509, 0xe5ee, 0xf5cf, 0xc5ac, 0xd58d,
  53                                   0x3653, 0x2672, 0x1611, 0x630, 0x76d7, 0x66f6, 0x5695, 0x46b4,
  54                                   0xb75b, 0xa77a, 0x9719, 0x8738, 0xf7df, 0xe7fe, 0xd79d, 0xc7bc,
  55                                   0x48c4, 0x58e5, 0x6886, 0x78a7, 0x840, 0x1861, 0x2802, 0x3823,
  56                                   0xc9cc, 0xd9ed, 0xe98e, 0xf9af, 0x8948, 0x9969, 0xa90a, 0xb92b,
  57                                   0x5af5, 0x4ad4, 0x7ab7, 0x6a96, 0x1a71, 0xa50, 0x3a33, 0x2a12,
  58                                   0xdbfd, 0xcbdc, 0xfbbf, 0xeb9e, 0x9b79, 0x8b58, 0xbb3b, 0xab1a,
  59                                   0x6ca6, 0x7c87, 0x4ce4, 0x5cc5, 0x2c22, 0x3c03, 0xc60, 0x1c41,
  60                                   0xedae, 0xfd8f, 0xcdec, 0xddcd, 0xad2a, 0xbd0b, 0x8d68, 0x9d49,
  61                                   0x7e97, 0x6eb6, 0x5ed5, 0x4ef4, 0x3e13, 0x2e32, 0x1e51, 0xe70,
  62                                   0xff9f, 0xefbe, 0xdfdd, 0xcffc, 0xbf1b, 0xaf3a, 0x9f59, 0x8f78,
  63                                   0x9188, 0x81a9, 0xb1ca, 0xa1eb, 0xd10c, 0xc12d, 0xf14e, 0xe16f,
  64                                   0x1080, 0xa1, 0x30c2, 0x20e3, 0x5004, 0x4025, 0x7046, 0x6067,
  65                                   0x83b9, 0x9398, 0xa3fb, 0xb3da, 0xc33d, 0xd31c, 0xe37f, 0xf35e,
  66                                   0x2b1, 0x1290, 0x22f3, 0x32d2, 0x4235, 0x5214, 0x6277, 0x7256,
  67                                   0xb5ea, 0xa5cb, 0x95a8, 0x8589, 0xf56e, 0xe54f, 0xd52c, 0xc50d,
  68                                   0x34e2, 0x24c3, 0x14a0, 0x481, 0x7466, 0x6447, 0x5424, 0x4405,
  69                                   0xa7db, 0xb7fa, 0x8799, 0x97b8, 0xe75f, 0xf77e, 0xc71d, 0xd73c,
  70                                   0x26d3, 0x36f2, 0x691, 0x16b0, 0x6657, 0x7676, 0x4615, 0x5634,
  71                                   0xd94c, 0xc96d, 0xf90e, 0xe92f, 0x99c8, 0x89e9, 0xb98a, 0xa9ab,
  72                                   0x5844, 0x4865, 0x7806, 0x6827, 0x18c0, 0x8e1, 0x3882, 0x28a3,
  73                                   0xcb7d, 0xdb5c, 0xeb3f, 0xfb1e, 0x8bf9, 0x9bd8, 0xabbb, 0xbb9a,
  74                                   0x4a75, 0x5a54, 0x6a37, 0x7a16, 0xaf1, 0x1ad0, 0x2ab3, 0x3a92,
  75                                   0xfd2e, 0xed0f, 0xdd6c, 0xcd4d, 0xbdaa, 0xad8b, 0x9de8, 0x8dc9,
  76                                   0x7c26, 0x6c07, 0x5c64, 0x4c45, 0x3ca2, 0x2c83, 0x1ce0, 0xcc1,
  77                                   0xef1f, 0xff3e, 0xcf5d, 0xdf7c, 0xaf9b, 0xbfba, 0x8fd9, 0x9ff8,
  78                                   0x6e17, 0x7e36, 0x4e55, 0x5e74, 0x2e93, 0x3eb2, 0xed1, 0x1ef0
  79                                  );
  80
  81 our %bar_trend;
  82
  83 $bar_trend{-60} = "Falling Rapidly";
  84 $bar_trend{196} = "Falling Rapidly";
  85 $bar_trend{-20} = "Falling Slowly";
  86 $bar_trend{236} = "Falling Slowly";
  87 $bar_trend{0} = "Steady";
  88 $bar_trend{20} = "Rising Slowly";
  89 $bar_trend{60} = "Rising Rapidly";
  90
  91 our $ending = 0;
  92
  93 $SIG{TERM} = $SIG{INT} = sub {++$ending; Mojo::IOLoop->stop;};
  94 $SIG{HUP} = 'IGNORE';
  95
  96
  97 # WebSocket weather service
  98 websocket '/weather' => sub {
  99   my $c = shift;
 100   my $msg = shift;
 101   my $tx = $c->tx;
 102
 103   # Opened
 104   app->log->debug('WebSocket opened.');
 105   dbg 'WebSocket opened' if isdbg 'chan';
 106   $WS->{$tx} = $tx;
 107
 108   # send historical data
 109   $c->send($ld->{lasthour_h}) if exists $ld->{lasthour_h};
 110   $c->send($ld->{lastmin_h}) if exists $ld->{lastmin_h};
 111
 112   # disable timeout
 113   $c->inactivity_timeout(3615);
 114
 115   # Incoming message
 116   $c->on(
 117                  message => sub {
 118                          my ($c, $msg) = @_;
 119                          dbg "websocket: text $msg" if isdbg 'chan';
 120                  },
 121                  json => sub {
 122                          my ($c, $msg) = @_;
 123                          dbg "websocket: json $msg" if isdbg 'chan';
 124                  }
 125   );
 126
 127   # Closed
 128   $c->on(finish => sub {
 129     my ($c, $code, $reason) = @_;
 130     app->log->debug("WebSocket closed with status $code.");
 131         dbg 'webwocket closed with status $code' if isdbg 'chan';
 132         delete $WS->{$tx};
 133   });
 134 };
 135
 136 get '/' => {template => 'index'};
 137
 138
 139 dbginit();
 140 if (@ARGV) {
 141         dbgadd(@ARGV);
 142 }
 143 dbgadd('chan');
 144
 145 dbg '***';
 146 dbg "*** starting $0";
 147 dbg '***';
 148
 149 read_ld();
 150
 151 our $dlog = SMGLog->new("day");
 152 dbg "before next tick";
 153 Mojo::IOLoop->next_tick(sub { loop() });
 154 dbg "before app start";
 155 app->start;
 156 dbg "after app start";
 157
 158 write_ld();
 159 $dataf->close if $dataf;
 160
 161 # move all the files along one
 162 cycle_loop_data_files();
 163
 164 dbg '***';
 165 dbg "*** ending $0";
 166 dbg '***';
 167
 168 exit 0;
 169
 170 ##################################################################################
 171
 172 sub loop
 173 {
 174         dbg "last_min: " . scalar gmtime($ld->{last_min});
 175         dbg "last_hour: " . scalar gmtime($ld->{last_hour});
 176
 177         $did = Mojo::IOLoop->recurring(1 => sub {$dlog->flushall});
 178
 179         do_reopen($devname);
 180 }
 181
 182
 183
 184 sub on_read
 185 {
 186         my ($ser, $d) = @_;
 187         $buf .= $d;
 188         $d =~ s/([\%\x00-\x1f\x7f-\xff])/sprintf("%%%02X", ord($1))/eg;
 189         dbg "read added '$d' buf lth=" . length $buf if isdbg 'raw';
 190         if ($state eq 'waitnl' && $buf =~ /[\cJ\cM]+/) {
 191                 dbg "Got \\n" if isdbg 'state';
 192                 Mojo::IOLoop->remove($tid) if $tid;
 193                 undef $tid;
 194                 undef $buf;
 195                 $nlcount = 0;
 196                 $ser->write("LPS 1 1\n");
 197                 chgstate("waitloop");
 198         } elsif ($state eq "waitloop") {
 199                 if ($buf =~ /\x06/) {
 200                         dbg "Got ACK 0x06" if isdbg 'state';
 201                         chgstate('waitlooprec');
 202                         undef $buf;
 203                 }
 204         } elsif ($state eq 'waitlooprec') {
 205                 if (length $buf >= 99) {
 206                         dbg "got loop record" if isdbg 'chan';
 207                         chgstate('');
 208                         process($buf);
 209                         undef $buf;
 210                 }
 211         }
 212 }
 213
 214 sub start_loop
 215 {
 216         $nlcount = 1;
 217         dbg "start_loop writing $nlcount \\n" if isdbg 'state';
 218         $ser->write("\n");
 219         Mojo::IOLoop->remove($tid) if $tid;
 220         undef $tid;
 221         $tid = Mojo::IOLoop->recurring(0.6 => sub {
 222                                                                            if (++$nlcount > 10) {
 223                                                                                    dbg "\\n count > 10, closing connection" if isdbg 'chan';
 224                                                                                    do_reopen($devname);
 225                                                                                    return;
 226                                                                            }
 227                                                                            dbg "writing $nlcount \\n" if isdbg 'state';
 228                                                                            $ser->write("\n");
 229                                                                    });
 230         chgstate("waitnl");
 231 }
 232
 233 sub chgstate
 234 {
 235         dbg "state '$state' -> '$_[0]'" if isdbg 'state';
 236         $state = $_[0];
 237 }
 238
 239 sub do_reopen
 240 {
 241         my $name = shift;
 242         dbg "do reopen on '$name' ending $ending";
 243         unless ($ending) {
 244                 $ser = do_open($name);
 245                 start_loop();
 246                 chgstate('');
 247                 $nlcount = 0;
 248                 Mojo::IOLoop->start unless Mojo::IOLoop->is_running;
 249         }
 250 }
 251
 252 sub do_open
 253 {
 254         my $name = shift;
 255
 256         $ser->close if $ser;
 257         undef $ser;
 258
 259         my $ob = Serial->new($name, 19200) || die "$name $!\n";
 260         dbg "streaming $name fileno(" . fileno($ob) . ")" if isdbg 'chan';
 261
 262         my $ser = Mojo::IOLoop::Stream->new($ob);
 263         $ser->on(error=>sub {dbg "serial $_[1]"; do_reopen($name) unless $ending});
 264         $ser->on(close=>sub {dbg "serial closing"; do_reopen($name) unless $ending});
 265         $ser->on(timeout=>sub {dbg "serial timeout";});
 266         $ser->on(read=>sub {on_read(@_)});
 267         $ser->start;
 268
 269         Mojo::IOLoop->remove($tid) if $tid;
 270         undef $tid;
 271         Mojo::IOLoop->remove($rid) if $rid;
 272         undef $rid;
 273         $rid = Mojo::IOLoop->recurring($poll_interval => sub {
 274                                                                            start_loop() if !$state;
 275                                                                    });
 276         chgstate('');
 277         $nlcount = 0;
 278
 279         return $ser;
 280 }
 281
 282 my @min;
 283 my @hour;
 284
 285 sub process
 286 {
 287         my $blk = shift;
 288         my $loo =  substr $blk,0,3;
 289         unless ( $loo eq 'LOO') {
 290                 dbg "Block invalid loo -> $loo" if isdbg 'chan'; return;
 291         }
 292
 293         my $tmp;
 294         my $temp;
 295         my $rain;
 296         my %h;
 297
 298         my $crc_calc = CRC_CCITT($blk);
 299
 300         if ($crc_calc==0) {
 301
 302                 # Common ones
 303                 $tmp = unpack("s", substr $blk,7,2) / 1000;
 304                 $h{Pressure} = nearest(1, in2mb($tmp));
 305
 306                 $tmp = unpack("s", substr $blk,9,2) / 10;
 307                 $h{Temp_In} = nearest(0.1, f2c($tmp));
 308
 309                 $temp  = nearest(0.1, f2c(unpack("s", substr $blk,12,2) / 10));
 310                 $h{Temp_Out}  = $temp;
 311                 if ($temp > 75 || $temp < -75) {
 312                         dbg "LOOP Temperature out of range ($temp), record ignored";
 313                         return;
 314                 }
 315
 316                 $tmp = unpack("C", substr $blk,14,1);
 317                 $h{Wind} = nearest(0.1, mph2mps($tmp));
 318                 $h{Dir}     = unpack("s", substr $blk,16,2)+0;
 319
 320                 my $wind = {w => $h{Wind}, d => $h{Dir}};
 321                 $wind = 0 if $wind == 255;
 322                 push @{$ld->{wind_min}}, $wind;
 323
 324                 $tmp = int(unpack("C", substr $blk,33,1)+0);
 325                 if ($tmp > 100) {
 326                         dbg "LOOP Outside Humidity out of range ($tmp), record ignored";
 327                         return;
 328                 }
 329                 $h{Humidity_Out} = $tmp;
 330                 $tmp = int(unpack("C", substr $blk,11,1)+0);
 331                 if ($tmp > 100) {
 332                         dbg "LOOP Inside Humidity out of range ($tmp), record ignored";
 333                         return;
 334                 }
 335                 $h{Humidity_In}  = $tmp;
 336
 337
 338                 $tmp = unpack("C", substr $blk,43,1)+0;
 339                 $h{UV} = $tmp unless $tmp >= 255;
 340                 $tmp = unpack("s", substr $blk,44,2)+0; # watt/m**2
 341                 $h{Solar} = $tmp unless $tmp >= 32767;
 342
 343                 #       $h{Rain_Rate}  = nearest(0.1,unpack("s", substr $blk,41,2) * $rain_mult);
 344                 $rain = $h{Rain_Day}   = nearest(0.1, unpack("s", substr $blk,50,2) * $rain_mult);
 345                 my $delta_rain = $h{Rain} = nearest(0.1, ($rain >= $ld->{last_rain} ? $rain - $ld->{last_rain} : $rain)) if $loop_count;
 346                 $ld->{last_rain} = $rain;
 347
 348                 # what sort of packet is it?
 349                 my $sort =  unpack("C", substr $blk,4,1);
 350                 if ($sort) {
 351
 352                         # Newer LOOP2 packet
 353                         $tmp = unpack("C", substr $blk,18,2);
 354                         #               $h{Wind_Avg_10} = nearest(0.1,mph2mps($tmp/10));
 355                         $tmp = unpack("C", substr $blk,20,2);
 356                         #               $h{Wind_Avg_2} = nearest(0.1,mph2mps($tmp/10));
 357                         $tmp = unpack("C", substr $blk,22,2);
 358                         #               $h{Wind_Gust_10} = nearest(0.1,mph2mps($tmp/10));
 359
 360                         #               $h{Dir_Avg_10} = unpack("C", substr $blk,24,2)+0;
 361                         $tmp = unpack("C", substr $blk,30,2);
 362                         $h{Dew_Point} = nearest(0.1, f2c($tmp));
 363
 364                 } else {
 365
 366                         # Older LOOP packet
 367                         $tmp = unpack("C", substr $blk,15,1);
 368                         #               $h{Wind_Avg_10} = nearest(0.1,mph2mps($tmp));
 369                         $h{Dew_Point}  = nearest(0.1, dew_point($h{Temp_Out}, $h{Humidity_Out}));
 370                         $h{Rain_Month}  = nearest(0.1, unpack("s", substr $blk,52,2) * $rain_mult);
 371                         $h{Rain_Year}  = nearest(0.1, unpack("s", substr $blk,54,2) * $rain_mult);
 372                 }
 373
 374                 my $ts = time;
 375                 my $s;
 376                 my $dayno = int($ts/86400);
 377                 if ($dayno > $ld->{last_day}) {
 378                         $ld->{Temp_Out_Max} = $ld->{Temp_Out_Min} = $temp;
 379                         $ld->{Temp_Out_Max_T} = $ld->{Temp_Out_Min_T} = clocktime($ts, 0);
 380                         $ld->{last_day} = $dayno;
 381                         write_ld();
 382                         cycle_loop_data_files();
 383                 }
 384                 if ($temp > $ld->{Temp_Out_Max}) {
 385                         $ld->{Temp_Out_Max} = $temp;
 386                         $ld->{Temp_Out_Max_T} = clocktime($ts, 0);
 387                         write_ld();
 388                 }
 389                 if ($temp < $ld->{Temp_Out_Min}) {
 390                         $ld->{Temp_Out_Min} = $temp;
 391                         $ld->{Temp_Out_Min_T} = clocktime($ts, 0);
 392                         write_ld();
 393                 }
 394
 395                 if ($ts >= $ld->{last_hour} + 1800) {
 396                         $h{Pressure_Trend}    = unpack("C", substr $blk,3,1);
 397                         $h{Pressure_Trend_txt} = $bar_trend{$h{Pressure_Trend}};
 398                         $h{Batt_TX_OK}  = (unpack("C", substr $blk,86,1)+0) ^ 1;
 399                         $h{Batt_Console}  = nearest(0.01, unpack("s", substr $blk,87,2) * 0.005859375);
 400                         $h{Forecast_Icon}  = unpack("C", substr $blk,89,1);
 401                         $h{Forecast_Rule}  = unpack("C", substr $blk,90,1);
 402                         $h{Sunrise}  = sprintf( "%04d", unpack("S", substr $blk,91,2) );
 403                         $h{Sunrise}  =~ s/(\d{2})(\d{2})/$1:$2/;
 404                         $h{Sunset}   = sprintf( "%04d", unpack("S", substr $blk,93,2) );
 405                         $h{Sunset}  =~ s/(\d{2})(\d{2})/$1:$2/;
 406                         $h{Temp_Out_Max} = $ld->{Temp_Out_Max};
 407                         $h{Temp_Out_Min} = $ld->{Temp_Out_Min};
 408                         $h{Temp_Out_Max_T} = $ld->{Temp_Out_Max_T};
 409                         $h{Temp_Out_Min_T} = $ld->{Temp_Out_Min_T};
 410
 411
 412                         if ($loop_count) {      # i.e not the first
 413                                 my $a = wind_average(scalar @{$ld->{wind_hour}} ? @{$ld->{wind_hour}} : {w => $h{Wind}, d => $h{Dir}});
 414
 415                                 $h{Wind_1h} = nearest(0.1, $a->{w});
 416                                 $h{Dir_1h} = nearest(0.1, $a->{d});
 417
 418                                 $a = wind_average(@{$ld->{wind_min}});
 419                                 $h{Wind_1m} = nearest(0.1, $a->{w});
 420                                 $h{Dir_1m} = nearest(1, $a->{d});
 421
 422                                 ($h{Rain_1m}, $h{Rain_1h}, $h{Rain_24h}) = calc_rain($rain);
 423                         }
 424                         $ld->{last_rain_min} = $ld->{last_rain_hour} = $rain;
 425
 426                         $last_hour_h = {%h};
 427                         $s = genstr($ts, 'h', \%h);
 428                         $ld->{lasthour_h} = $s;
 429
 430                         $ld->{last_hour} = int($ts/1800)*1800;
 431                         $ld->{last_min} = int($ts/60)*60;
 432                         @{$ld->{wind_hour}} = ();
 433                         @{$ld->{wind_min}} = ();
 434
 435                         output_str($s, 1) if $s;
 436                         write_ld();
 437
 438                 } elsif ($ts >= $ld->{last_min} + 60) {
 439                         my $a = wind_average(@{$ld->{wind_min}});
 440                         my %save;
 441
 442                         push @{$ld->{wind_hour}}, $a;
 443
 444                         if ($loop_count) {      # i.e not the first
 445                                 my $rm;
 446
 447                                 $h{Wind_1m} = nearest(0.1, $a->{w});
 448                                 $h{Dir_1m} = nearest(1, $a->{d});
 449                                 ($h{Rain_1m}, $h{Rain_1h}, $h{Rain_24h}) = calc_rain($rain);
 450                         }
 451                         $ld->{last_rain_min} = $rain;
 452
 453                         $h{Temp_Out_Max} = $ld->{Temp_Out_Max};
 454                         $h{Temp_Out_Min} = $ld->{Temp_Out_Min};
 455                         $h{Temp_Out_Max_T} = $ld->{Temp_Out_Max_T};
 456                         $h{Temp_Out_Min_T} = $ld->{Temp_Out_Min_T};
 457
 458                         $last_min_h = {%h};
 459                         $s = genstr($ts, 'm', \%h);
 460                         $ld->{lastmin_h} = $s;
 461
 462                         $ld->{last_min} = int($ts/60)*60;
 463                         @{$ld->{wind_min}} = ();
 464
 465                         output_str($s, 1) if $s;
 466                         write_ld();
 467
 468                 } else {
 469                         my $o = gen_hash_diff($ld->{last_h}, \%h);
 470                         if ($o) {
 471                                 $s = genstr($ts, 'r', $o);
 472                         }
 473                         else {
 474                                 dbg "loop rec not changed" if isdbg 'chan';
 475                         }
 476                         output_str($s, 0) if $s;
 477                 }
 478                 $ld->{last_h} = \%h;
 479                 ++$loop_count;
 480         } else {
 481                 dbg "CRC check failed for LOOP data!";
 482         }
 483         return;
 484 }
 485
 486 sub genstr
 487 {
 488         my $ts = shift;
 489         my $let = shift;
 490         my $h = shift;
 491
 492         my $j =  $json->encode($h);
 493         my $tm = clocktime($ts, 1);
 494         return qq|{"tm":"$tm","t":$ts,"$let":$j}|;
 495 }
 496
 497 sub clocktime
 498 {
 499         my $ts = shift;
 500         my $secsreq = shift;
 501         my ($sec,$min,$hr) = (gmtime $ts)[0,1,2];
 502         my $s;
 503         if ($secsreq) {
 504                 $s = sprintf "%02d:%02d:%02d", $hr, $min, $sec;
 505         } else {
 506                 $s = sprintf "%02d:%02d", $hr, $min;
 507         }
 508         return $s;
 509 }
 510
 511 sub output_str
 512 {
 513         my $s = shift;
 514         my $logit = shift;
 515
 516         dbg $s;
 517 #       say $s;
 518         $dlog->writenow($s) if $logit;
 519         foreach my $ws (keys $WS) {
 520                 my $tx = $WS->{$ws};
 521                 if ($tx) {
 522                         $tx->send($s);
 523                 } else {
 524                         delete $WS->{$tx};
 525                 }
 526         }
 527 }
 528
 529 sub gen_hash_diff
 530 {
 531         my $last = shift;
 532         my $now = shift;
 533         my %o;
 534         my $count;
 535
 536         while (my ($k, $v) = each %$now) {
 537                 if ($last->{$k} ne $now->{$k}) {
 538                         $o{$k} = $v;
 539                         ++$count;
 540                 }
 541         }
 542         return $count ? \%o : undef;
 543 }
 544
 545 sub dew_point
 546 {
 547         my $temp = shift @_;
 548         my $rh   = shift @_;
 549
 550         #  Using the simplified approximation for dew point
 551         #  Accurate to 1 degree C for humidities > 50 %
 552         #  http://en.wikipedia.org/wiki/Dew_point
 553
 554         my $dewpoint = $temp - ((100 - $rh) / 5);
 555
 556         # this is the more complete one (which doesn't work)
 557         #my $a = 6.1121;
 558         #my $b = 18.678;
 559         #my $c = 257.14;
 560         #my $ytrh = log(($rh/100) + ($b * $temp) / ($c + $temp));
 561         #my $dewpoint = ($c * $ytrh) / ($b - $ytrh);
 562
 563         return $dewpoint;
 564 }
 565
 566 sub CRC_CCITT
 567 {
 568     # Expects packed data...
 569     my $data_str = shift @_;
 570
 571         my $crc = 0;
 572         my @lst = split //, $data_str;
 573         foreach my $data (@lst) {
 574                 my $data = unpack("c",$data);
 575
 576                 my $crc_prev = $crc;
 577                 my $index = $crc >> 8 ^ $data;
 578                 my $lhs = $crc_table[$index];
 579                 #print "lhs=$lhs, crc=$crc\n";
 580                 my $rhs = ($crc << 8) & 0xFFFF;
 581                 $crc = $lhs ^ $rhs;
 582
 583
 584         }
 585
 586         return $crc;
 587 }
 588
 589 sub f2c
 590 {
 591         return ($_[0] - 32) * 5/9;
 592 }
 593
 594 sub mph2mps
 595 {
 596         return $_[0] * 0.44704;
 597 }
 598
 599 sub in2mb
 600 {
 601         return $_[0] * 33.8637526;
 602 }
 603
 604 sub wind_average
 605 {
 606         my ($sindir, $cosdir, $wind);
 607         my $count;
 608
 609         foreach my $r (@_) {
 610                 $wind += $r->{w};
 611                 $sindir += sin(d2r($r->{d})) * $r->{w};
 612                 $cosdir += cos(d2r($r->{d})) * $r->{w};
 613                 ++$count;
 614         }
 615
 616         my $avhdg = r2d(atan2($sindir, $cosdir));
 617         $avhdg += 360 if $avhdg < 0;
 618         return {w => nearest(0.1,$wind / $count), d => nearest(0.1,$avhdg)};
 619 }
 620
 621 # radians to degrees
 622 sub r2d
 623 {
 624     my $n = shift;
 625     return ($n / pi) * 180;
 626 }
 627
 628 # degrees to radians
 629 sub d2r
 630 {
 631     my $n = shift;
 632     return ($n / 180) * pi;
 633 }
 634
 635 sub calc_rain
 636 {
 637         my $rain = shift;
 638
 639         $ld->{rain24} ||= [];
 640
 641         my $Rain_1h = nearest(0.1, $rain >= $ld->{last_rain_hour} ? $rain - $ld->{last_rain_hour} : $rain); # this is the rate for this hour, so far
 642         my $rm = nearest(0.1, $rain >= $ld->{last_rain_min} ? $rain - $ld->{last_rain_min} : $rain);
 643         my $Rain_1m = nearest(0.1, $rm);
 644         push @{$ld->{rain24}}, $Rain_1m;
 645         $ld->{rain_24} += $rm;
 646         while (@{$ld->{rain24}} > 24*60) {
 647                 $ld->{rain_24} -= shift @{$ld->{rain24}};
 648         }
 649         my $Rain_24h = nearest(0.1, $ld->{rain_24});
 650         return ($Rain_1m, $Rain_1h, $Rain_24h);
 651 }
 652
 653 sub read_ld
 654 {
 655         unless ($dataf) {
 656                 $dataf = IO::File->new("+>> $datafn") or die "cannot open $datafn $!";
 657                 $dataf->autoflush(1);
 658         }
 659
 660         seek $dataf, 0, 0;
 661         my $s = <$dataf>;
 662         chomp $s;
 663         dbg "read loop data: $s" if isdbg 'json';
 664         $ld = $json->decode($s) if length $s;
 665
 666         # sort out rain stats
 667         my $c;
 668         if ($ld->{rain24} && ($c = @{$ld->{rain24}}) < 24*60) {
 669                 my $diff = 24*60 - $c;
 670                 unshift @{$ld->{rain24}}, 0 for 0 .. $diff;
 671         }
 672         my $rain;
 673
 674         if ($ld->{rain24}) {
 675                 $rain += $_ for @{$ld->{rain24}};
 676         }
 677
 678         $ld->{rain_24} = nearest(0.1, $rain);
 679         delete $ld->{hour};
 680         delete $ld->{min};
 681 }
 682
 683 sub write_ld
 684 {
 685         unless ($dataf) {
 686                 $dataf = IO::File->new("+>> $datafn") or die "cannot open $datafn $!";
 687                 $dataf->autoflush(1);
 688         }
 689
 690         seek $dataf, 0, 0;
 691         truncate $dataf, 0;
 692         $ld->{ts} = time;
 693         my $s = $json->encode($ld);
 694         dbg "write loop data: $s" if isdbg 'json';
 695         print $dataf "$s\n";
 696 }
 697
 698 sub cycle_loop_data_files
 699 {
 700         $dataf->close if $dataf;
 701
 702         rename "$datafn.oooo", "$datafn.ooooo";
 703         rename "$datafn.ooo", "$datafn.oooo";
 704         rename "$datafn.oo", "$datafn.ooo";
 705         rename "$datafn.o", "$datafn.oo";
 706         copy $datafn, "$datafn.o";
 707 }
 708
 709 __DATA__
 710
 711 @@ index.html.ep
 712 % my $url = url_for 'weather';
 713 <!DOCTYPE html>
 714 <html>
 715   <head>
 716     <title>DWeather</title>
 717     <meta charset="utf-8">
 718     <meta http-equiv="X-UA-Compatible" content="IE=edge">
 719     <meta name="viewport" content="width=device-width, initial-scale=1">
 720
 721     <!-- Latest compiled and minified CSS -->
 722     <link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.2/css/bootstrap.min.css">
 723
 724     <!-- Optional theme -->
 725     <link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.2/css/bootstrap-theme.min.css">
 726
 727   </head>
 728   <body>
 729     <center><h1>High View Weather</h1></center>
 730
 731     <script>
 732         var ws;
 733
 734     function process(key,value) {
 735                 var d = document.getElementById(key);
 736                 if (d !== null) {
 737                         d.innerHTML = value;
 738                 }
 739         }
 740
 741         function traverse(o) {
 742                 console.log(o);
 743                 for (var i in o) {
 744                         process(i, o[i]);
 745                         if (o[i] !== null && typeof(o[i])=="object") {
 746                                 traverse(o[i]);
 747                         }
 748                 }
 749         }
 750
 751         window.onload = function() {
 752
 753                 ws = new WebSocket('<%= $url->to_abs %>');
 754
 755                 if (typeof(ws) === 'object') {
 756                         ws.onmessage = function (event) {
 757                                 var js = JSON.parse(event.data);
 758                                 if (js !== null && typeof(js) === 'object') {
 759                                         traverse(js);
 760                                 }
 761                         };
 762                         ws.onopen = function (event) {
 763                                 document.getElementById("wsconnect").innerHTML = 'ws connected to: <%= $url->to_abs %>';
 764                                 ws.send('WebSocket support works!');
 765                         };
 766                         ws.onclose = function(event) {
 767                                 document.getElementById("wsconnect").innerHTML = 'ws disconnected, refresh to restart';
 768                         }
 769                 } else {
 770                         document.body.innerHTML += 'Webserver only works with Websocket aware browsers';
 771                 }
 772         }
 773     </script>
 774
 775     <div id="container">
 776         <div id="start-template">
 777         <br><br>
 778         <table border=1 width=80% align="center">
 779         <tr>
 780     <th>Time:<td><span id="tm"> </span>
 781         <th>Sunrise:<td><span id="Sunrise"> </span>
 782         <th>Sunset:<td><span id="Sunset"> </span>
 783         <th>Console Volts:<td><span id="Batt_Console"> </span>
 784         <th>TX Battery OK:<td><span id="Batt_TX_OK"> </span>
 785
 786         <tr>
 787     <th>Pressure:<td><span id="Pressure"> </span>
 788         <th>Trend:<td><span id="Pressure_Trend_txt"> </span>
 789
 790         <tr>
 791     <th>Temperature in:<td> <span id="Temp_In"> </span>
 792         <th>Humidity:<td> <span id="Humidity_In"> </span>
 793
 794         <tr>
 795     <th>Temperature out:<td> <span id="Temp_Out"> </span>
 796         <th>Min:<td> <span id="Temp_Out_Min"> </span> @ <span id="Temp_Out_Min_T"> </span>
 797         <th>Max:<td> <span id="Temp_Out_Max"> </span> @ <span id="Temp_Out_Max_T"> </span>
 798         <th>Humidity:<td> <span id="Humidity_Out"> </span>
 799         <th>Dew Point:<td> <span id="Dew_Point"> </span>
 800
 801         <tr>
 802     <th>Wind Direction:<td> <span id="Dir"> </span>
 803         <th>Minute Avg:<td> <span id="Dir_1m">  </span>
 804         <th>Speed:<td> <span id="Wind"> </span>
 805         <th>Minute Avg:<td> <span id="Wind_1m">  </span>
 806
 807         <tr>
 808     <th>Rain 30mins:<td> <span id="Rain_1h"> </span>
 809         <th>Day:<td> <span id="Rain_Day"> </span>
 810         <th>24hrs:<td> <span id="Rain_24h"> </span>
 811         <th>Month:<td> <span id="Rain_Month"> </span>
 812         <th>Year:<td> <span id="Rain_Year"> </span>
 813         </table>
 814         <br>
 815         <div id="wsconnect" align="center"> </div>
 816         </div>
 817         </div>
 818     <!-- jQuery (necessary for Bootstrap's JavaScript plugins) -->
 819     <script src="https://ajax.googleapis.com/ajax/libs/jquery/1.11.2/jquery.min.js"></script>
 820     <!-- Latest compiled and minified JavaScript -->
 821     <script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.2/js/bootstrap.min.js"></script>
 822 </body>
 823 </html>