SDS011

Python Interface with Nova Fitness SDS011 sensor, running multiple sensors at once

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SDS011

Python Interface with Nova Fitness SDS011 sensor, running multiple sensors at once. Built from the datasheet

Set up

How to use the script

  1. You connect all the SDS011 sensors to USB hub (via a UART adapter), then you can run all of them at once:
    • first get list of USB devices connected to the hub, and initiate each instance 
        usbs = get_usb()
  processs = list()
  for port in usbs:
   p = SDS011(port=port, push_mqtt=False, interval=60)
   processs.append(p)
    • and then run the loop like this: 
        while True:
   for p in processs:
   try:
       p.run_passive()
       # p.run_query()
   except Exception as e:
       print(f'Error: {p.name} with {e}')
       continue
    • by default, the data is saved to CSV file in each folder named after month and year 
      p = SDS011(port=port, save_data=False, interval=60)
  2. If the are different USB devices connected to the computer, then each USB port can be initiated: 
    p1 = SDS011(port='/dev/ttyUSB1', interval=60)
p2 = SDS011(port='/dev/ttyUSB3', interval=60)

    and put them in a loop:

    while True:
  for p in [p1, p2]:
 p.run_passive()

  3. There are two modes to collect data, besides active reading a). run_query() is for regularly reading data with fan is continously running, and thus only query data the duration defined by interval and b). run_passive() includes turning on the fan for 20 seconds, read data, and turn off the fan, and repeat cycle after each interval seconds

  4. If you have an MQTT server setup, then you need to specify the topic, routing, and authentication inside sds011/__init__.py file ```

MQTT host, users

mqtt = ‘192.168.1.100’ # change this topic = ‘sensor/sds011’ # and this auth = {‘username’: ‘mqtt_user’, ‘password’: ‘mqtt_password’} # and these two

and make sure to turn on the flag when instantiating:

p = SDS011(port=port, push_mqtt=True, interval=60) ```

Data analysis

Datasheet