Mercurial > ~darius > hgwebdir.cgi > wh1080

annotate util.c @ 1:01496de9f722

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Ignore build cruft.
author Daniel O'Connor <darius@dons.net.au>
date Tue, 09 Feb 2010 13:48:22 +1030
parents 9dab44dcb331
children b22a888eb975
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1 /*
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2 * WH-1080 data input utility.
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3 * Utility functions
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4 *
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5 * Greg Lehey, 22 November 2009
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6 *
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7 * $Id: util.c,v 1.6 2009/12/18 02:13:23 grog Exp $
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8 */
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10 #include "wh1080.h"
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12 /* Used in many places, but not here */
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13 char *wind_directions [] = {"N", "NNE", "NE", "ENE", "E", "ESE", "SE", "SSE",
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14 "S", "SSW", "SW", "WSW", "W", "WNW", "NW", "NNW "};
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16 float print_previous_rain; /* counter for print_readings */
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18 /* Print out readings */
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19 void print_readings (struct readings *readings)
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20 {
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21 static int lines = 0;
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22 char timestamp [STAMPSIZE];
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24 if (lines == 0)
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25 printf ("\n"
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26 " Page sv IT IH IDP OT OH ODP hPa SL abs rel Wind Gust Dir Rain CR PR \n");
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28 strftime (timestamp, STAMPSIZE, "%F %T", localtime (&readings->timestamp)); /* format time and date */
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30 printf ("%17s %5x %3d %5.1f %3d %5.1f %5.1f %3d %5.1f %6.1f %6.1f %6.1f %6.1f %5.1f %5.1f %3s %4.1f %4.1f %4.1f\n",
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31 timestamp, /* current time */
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32 readings->page, /* machine page number */
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33 readings->last_save_mins, /* last save minutes (?) */
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34 readings->inside_temp, /* inside temperature */
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35 readings->inside_humidity, /* humidity in percent */
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36 readings->inside_dewpoint, /* inside dewpoint */
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37 readings->outside_temp, /* outside temperature */
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38 readings->outside_humidity, /* humidity in percent */
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39 readings->outside_dewpoint, /* outside dewpoint */
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40 readings->pressure, /* absolute pressure, hPa */
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41 readings->pressure_sea_level, /* sea level pressure, hPa */
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42 readings->page1_abs_pressure, /* absolute pressure, hPa */
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43 readings->page1_rel_pressure, /* relative pressure, hPa */
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44 readings->wind_speed, /* wind speed in km/h */
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45 readings->wind_gust, /* wind gust speed in km/h */
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46 readings->wind_direction_text, /* wind direction */
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47 readings->rain - print_previous_rain, /* delta rainfall in mm */
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48 readings->rain, /* current rainfall in mm */
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49 readings->previous_rain ); /* previous rainfall in mm */
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50 print_previous_rain = readings->rain; /* reported this far */
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51 if (++lines > 60)
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52 lines = 0;
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53 }
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55 /*
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56 * Calculate dewpoint temperature. Replace this with something with better references.
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57 */
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58 float dewpoint (float temp, int humidity)
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59 {
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60 float Es; /* saturated water vapour pressure at dry-bulb temperature */
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61 float Ep; /* partial pressure at this humidity */
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62
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63 Es = 6.11 * pow (10.0, 7.5 * (temp / (237.7 + temp)));
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64 Ep = (humidity * Es) / 100;
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65 return (-430.22 + 237.7 * log (Ep)) / (-log (Ep) + 19.08);
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66 }
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67
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68 /*
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69 * Calculate inside and outside dewpoints and store in the record.
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70 */
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71 void set_dewpoints (struct readings *readings)
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72 {
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73 readings->inside_dewpoint = dewpoint (readings->inside_temp, readings->inside_humidity);
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74 readings->outside_dewpoint = dewpoint (readings->outside_temp, readings->outside_humidity);
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75 }
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77 /*
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78 * Convert pressure to sea-level pressure. The barometer is in the inside unit,
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79 * so we use the internal temperature as a base.
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80 */
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81 void set_sea_level_pressure (struct readings *readings)
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82 {
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83 float e = - config.elevation / (KELVIN (readings->inside_temp) * 29.263);
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84
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85 e = exp (e);
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86
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87 readings->pressure_sea_level = readings->pressure / e;
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88 }
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89
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90 /*
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91 * Simplified date conversion.
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92 * text must be big enough for format; we don't check.
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93 */
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94 void datetext (time_t date, char *text, char *format)
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95 {
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96 struct tm *date_tm; /* struct tm format of date */
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97
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98 date_tm = localtime (&date); /* and in struct tm format */
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99 strftime (text, 64, format, date_tm);
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100 }