rht03.c 1.8 KB

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  1. /*
  2. * rht03.c:
  3. * Driver for the MaxDetect series sensors
  4. *
  5. * Copyright (c) 2012-2013 Gordon Henderson. <projects@drogon.net>
  6. ***********************************************************************
  7. * This file is part of wiringPi:
  8. * https://projects.drogon.net/raspberry-pi/wiringpi/
  9. *
  10. * wiringPi is free software: you can redistribute it and/or modify
  11. * it under the terms of the GNU Lesser General Public License as published by
  12. * the Free Software Foundation, either version 3 of the License, or
  13. * (at your option) any later version.
  14. *
  15. * wiringPi is distributed in the hope that it will be useful,
  16. * but WITHOUT ANY WARRANTY; without even the implied warranty of
  17. * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  18. * GNU Lesser General Public License for more details.
  19. *
  20. * You should have received a copy of the GNU Lesser General Public License
  21. * along with wiringPi. If not, see <http://www.gnu.org/licenses/>.
  22. ***********************************************************************
  23. */
  24. #include <stdio.h>
  25. #include <wiringPi.h>
  26. #include <maxdetect.h>
  27. #define RHT03_PIN 0
  28. /*
  29. ***********************************************************************
  30. * The main program
  31. ***********************************************************************
  32. */
  33. int main (void)
  34. {
  35. int temp, rh ;
  36. int newTemp, newRh ;
  37. temp = rh = newTemp = newRh = 0 ;
  38. wiringPiSetup () ;
  39. piHiPri (55) ;
  40. for (;;)
  41. {
  42. delay (100) ;
  43. if (!readRHT03 (RHT03_PIN, &newTemp, &newRh))
  44. continue ;
  45. if ((temp != newTemp) || (rh != newRh))
  46. {
  47. temp = newTemp ;
  48. rh = newRh ;
  49. if ((temp & 0x8000) != 0) // Negative
  50. {
  51. temp &= 0x7FFF ;
  52. temp = -temp ;
  53. }
  54. printf ("Temp: %5.1f, RH: %5.1f%%\n", temp / 10.0, rh / 10.0) ;
  55. }
  56. }
  57. return 0 ;
  58. }