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Jan 5th, 2017
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  1. #Bibliotheken einbinden
  2. import RPi.GPIO as GPIO
  3. import time
  4.  
  5. #GPIO Modus (BOARD / BCM)
  6. GPIO.setmode(GPIO.BOARD)
  7. GPIO.setwarnings(False)
  8. #GPIO Pins zuweisen
  9. GPIO_TRIGGER = 16
  10. GPIO_ECHO = 18
  11.  
  12. #Richtung der GPIO-Pins festlegen (IN / OUT)
  13. GPIO.setup(GPIO_TRIGGER, GPIO.OUT)
  14. GPIO.setup(GPIO_ECHO, GPIO.IN)
  15.  
  16.  
  17. def distanz():
  18. # setze Trigger auf HIGH
  19. GPIO.output(GPIO_TRIGGER, True)
  20.  
  21. # setze Trigger nach 0.01ms aus LOW
  22. time.sleep(0.00001)
  23. GPIO.output(GPIO_TRIGGER, False)
  24.  
  25. StartZeit = time.time()
  26. StopZeit = time.time()
  27.  
  28. # speichere Startzeit
  29. while GPIO.input(GPIO_ECHO) == 0:
  30. StartZeit = time.time()
  31.  
  32. # speichere Ankunftszeit
  33. while GPIO.input(GPIO_ECHO) == 1:
  34. StopZeit = time.time()
  35.  
  36. # Zeit Differenz zwischen Start und Ankunft
  37. TimeElapsed = StopZeit - StartZeit
  38. # mit der Schallgeschwindigkeit (34300 cm/s) multiplizieren
  39. # und durch 2 teilen, da hin und zurueck
  40. distanz = (TimeElapsed * 34300) / 2
  41.  
  42. return distanz
  43.  
  44. if __name__ == '__main__':
  45.  
  46. try:
  47.  
  48. file_out = open("Testdatei.txt","w")
  49.  
  50. while True:
  51.  
  52. abstand = distanz()
  53.  
  54. print ("Gemessene Entfernung = %.1f cm" % abstand)
  55.  
  56. file_out.write("%.1f" % abstand)
  57.  
  58. time.sleep(5)
  59.  
  60.  
  61.  
  62. # Beim Abbruch durch STRG+C resetten
  63.  
  64. except KeyboardInterrupt:
  65.  
  66. print("Messung vom User gestoppt")
  67.  
  68. GPIO.cleanup()
  69.  
  70. file_out.close()
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