Filter values every hour

environmental_sensors.py

 from sense_hat import SenseHat
 from datetime import datetime
+from datetime import timedelta
 import time
 from pathlib import Path
 import csv
+import numpy as np
 
 sense = SenseHat()
 
 def float_format(f):
     return '{:.2f}'.format(f)
 
+def float_mean(values):
+    return float_format(np.mean(values))
+
 def get_data():
-    humidity = float_format(sense.get_humidity())
-    temp_humidity = float_format(sense.get_temperature_from_humidity())
-    #print("Humidity sensor : {} %rH , {} °C".format(humidity, temp_humidity))
+    humidity = []
+    temp_humidity = []
+    pressure = []
+    temp_pressure = []
+    # Store sensor values every second during one hour
+    for _ in range(3600):
+        humidity.append(sense.get_humidity())
+        temp_humidity.append(sense.get_temperature_from_humidity())
+        pressure.append(sense.get_pressure())
+        temp_pressure.append(sense.get_temperature_from_pressure())
+        time.sleep(1)
 
-    pressure = float_format(sense.get_pressure())
-    temp_pressure = float_format(sense.get_temperature_from_pressure())
+    #print("Humidity sensor : {} %rH , {} °C".format(humidity, temp_humidity))
     #print("Pressure sensor : {} Millibars , {} °C".format(pressure, temp_pressure))
-    
-    return [datetime.now().timestamp(), humidity, temp_humidity, pressure, temp_pressure]
+    # Get the mean value during the hour
+    return [(datetime.now()-timedelta(minutes=30)).timestamp(),
+            float_mean(humidity),
+            float_mean(temp_humidity),
+            float_mean(pressure),
+            float_mean(temp_pressure)]
 
 # Create folder to store the data
 data_folder = Path('./data')
@@ -26,7 +42,7 @@ data_folder.mkdir(parents=True, exist_ok=True)
 try:
     while(True):
         current_month = datetime.now().month
-        file_date = datetime.now().strftime('%Y_%m_%d_%H_%M')
+        file_date = datetime.now().strftime('%Y_%m_%d_%H')
         file_name = data_folder/str('sense_hat_data_' + file_date + '.csv')
         with file_name.open('w') as csvfile:
             writer = csv.writer(csvfile)
@@ -34,7 +50,6 @@ try:
             
             while(True):
                 writer.writerow(get_data())
-                time.sleep(1)
                 if(current_month != datetime.now().month):
                     break