X-Git-Url: https://zdv2.bktei.com/gitweb/EVA-2020-02-2.git/blobdiff_plain/f7a6afa2b8b554ecc0ca50e2dfb18f65b8c7d928..0c5111f2f7b09f9e24ff9165aa3ad7ae803fb6a7:/examples/luftdaten.py?ds=sidebyside

diff --git a/examples/luftdaten.py b/examples/luftdaten.py
index 2177a56..4d3d49a 100755
--- a/examples/luftdaten.py
+++ b/examples/luftdaten.py
@@ -1,11 +1,9 @@
 #!/usr/bin/env python
 
-import time
-import json
 import requests
 import ST7735
 from bme280 import BME280
-from pms5003 import PMS5003
+from pms5003 import PMS5003, ReadTimeoutError
 from subprocess import PIPE, Popen, check_output
 from PIL import Image, ImageDraw, ImageFont
 
@@ -14,12 +12,15 @@ try:
 except ImportError:
     from smbus import SMBus
 
-print("""luftdaten.py - Reads temperature, pressure, humidity, PM2.5, and PM10 from
-Enviro plus and sends data to Luftdaten, the citizen science air quality project.
+print("""luftdaten.py - Reads temperature, pressure, humidity,
+PM2.5, and PM10 from Enviro plus and sends data to Luftdaten,
+the citizen science air quality project.
 
-Note: you'll need to register with Luftdaten at: https://meine.luftdaten.info/ and
-enter your Raspberry Pi serial number that's displayed on the Enviro plus LCD
-along with the other details before the data appears on the Luftdaten map.
+Note: you'll need to register with Luftdaten at:
+https://meine.luftdaten.info/ and enter your Raspberry Pi
+serial number that's displayed on the Enviro plus LCD along
+with the other details before the data appears on the
+Luftdaten map.
 
 Press Ctrl+C to exit!
 
@@ -30,9 +31,6 @@ bus = SMBus(1)
 # Create BME280 instance
 bme280 = BME280(i2c_dev=bus)
 
-# Create PMS5003 instance
-pms5003 = PMS5003()
-
 # Create LCD instance
 disp = ST7735.ST7735(
     port=0,
@@ -46,6 +44,10 @@ disp = ST7735.ST7735(
 # Initialize display
 disp.begin()
 
+# Create PMS5003 instance
+pms5003 = PMS5003()
+
+
 # Read values from BME280 and PMS5003 and return as dict
 def read_values():
     values = {}
@@ -55,23 +57,32 @@ def read_values():
     values["temperature"] = "{:.2f}".format(comp_temp)
     values["pressure"] = "{:.2f}".format(bme280.get_pressure() * 100)
     values["humidity"] = "{:.2f}".format(bme280.get_humidity())
-    pm_values = pms5003.read()
-    values["P2"] = str(pm_values.pm_ug_per_m3(2.5))
-    values["P1"] = str(pm_values.pm_ug_per_m3(10))
+    try:
+        pm_values = pms5003.read()
+        values["P2"] = str(pm_values.pm_ug_per_m3(2.5))
+        values["P1"] = str(pm_values.pm_ug_per_m3(10))
+    except ReadTimeoutError:
+        pms5003.reset()
+        pm_values = pms5003.read()
+        values["P2"] = str(pm_values.pm_ug_per_m3(2.5))
+        values["P1"] = str(pm_values.pm_ug_per_m3(10))
     return values
 
+
 # Get CPU temperature to use for compensation
 def get_cpu_temperature():
     process = Popen(['vcgencmd', 'measure_temp'], stdout=PIPE)
     output, _error = process.communicate()
     return float(output[output.index('=') + 1:output.rindex("'")])
 
+
 # Get Raspberry Pi serial number to use as ID
 def get_serial_number():
-    with open('/proc/cpuinfo','r') as f:
+    with open('/proc/cpuinfo', 'r') as f:
         for line in f:
-            if line[0:6]=='Serial':
-                return(line.split(":")[1].strip())
+            if line[0:6] == 'Serial':
+                return line.split(":")[1].strip()
+
 
 # Check for Wi-Fi connection
 def check_wifi():
@@ -80,6 +91,7 @@ def check_wifi():
     else:
         return False
 
+
 # Display Raspberry Pi serial and Wi-Fi status on LCD
 def display_status():
     wifi_status = "connected" if check_wifi() else "disconnected"
@@ -96,34 +108,37 @@ def display_status():
     draw.text((x, y), message, font=font, fill=text_colour)
     disp.display(img)
 
+
 def send_to_luftdaten(values, id):
     pm_values = dict(i for i in values.items() if i[0].startswith("P"))
     temp_values = dict(i for i in values.items() if not i[0].startswith("P"))
 
     resp_1 = requests.post("https://api.luftdaten.info/v1/push-sensor-data/",
-        json={
-            "software_version": "enviro-plus 0.0.1",
-            "sensordatavalues": [{"value_type": key, "value": val} for key, val in pm_values.items()]
-        },
-        headers={
-            "X-PIN":    "1",
-            "X-Sensor": id,
-            "Content-Type": "application/json",
-            "cache-control": "no-cache"
-        }
+             json={
+                 "software_version": "enviro-plus 0.0.1",
+                 "sensordatavalues": [{"value_type": key, "value": val} for
+                                      key, val in pm_values.items()]
+             },
+             headers={
+                 "X-PIN":    "1",
+                 "X-Sensor": id,
+                 "Content-Type": "application/json",
+                 "cache-control": "no-cache"
+             }
     )
 
     resp_2 = requests.post("https://api.luftdaten.info/v1/push-sensor-data/",
-        json={
-            "software_version": "enviro-plus 0.0.1",
-            "sensordatavalues": [{"value_type": key, "value": val} for key, val in temp_values.items()]
-        },
-        headers={
-            "X-PIN":    "11",
-            "X-Sensor": id,
-            "Content-Type": "application/json",
-            "cache-control": "no-cache"
-        }
+             json={
+                 "software_version": "enviro-plus 0.0.1",
+                 "sensordatavalues": [{"value_type": key, "value": val} for
+                                      key, val in temp_values.items()]
+             },
+             headers={
+                 "X-PIN":    "11",
+                 "X-Sensor": id,
+                 "Content-Type": "application/json",
+                 "cache-control": "no-cache"
+             }
     )
 
     if resp_1.ok and resp_2.ok:
@@ -131,6 +146,7 @@ def send_to_luftdaten(values, id):
     else:
         return False
 
+
 # Compensation factor for temperature
 comp_factor = 1.2