SDS Sensor Reader

This python script can be used to read the data from the SDS011/SDS18/SDS021 and upload it to the aqicn.org server.

The script continuously reads the data from the SDS sensor, and, every minute, uploads the average, median and standard deviation to the server.

For more information, refer to https://aqicn.org/data-feed/upload-api/

Installation

Make sure to update the USB port and sensor ID configuration in the script, lines 9 to 12:

LOCATION = {'latitude': 28.7501, 'longitude': 77.1177}
TOKEN    = "dummy-token-for-test-purpose-only"
SENSORID = "YOUR-SENSOR-ID"
USBPORT  = "/dev/ttyUSB0"

For the TOKEN, you can get one from this page: https://aqicn.org/data-platform/token/

For the SENSORID, you can use any name less than 128 characters. This ID is only used for you to help if you have multiple sensors.

For the USBPORT, you need to check on which USB port is the serial USB converter mounted. Check https://learn.sparkfun.com/tutorials/terminal-basics/connecting-to-your-device for more information.

Running the script

Just use: python sds-reader.py

Output example:

Starting reading sensor YOUR-SENSOR-ID on port /dev/ttyUSB0
Reading [ 1]: {'pm2.5': 6.174900567257725, 'pm10': 3.1934677522143726}
Reading [ 2]: {'pm2.5': 7.555017736539956, 'pm10': 7.020834793042507}
Reading [ 3]: {'pm2.5': 0.3844247110354293, 'pm10': 7.771734774405182}
Reading [ 4]: {'pm2.5': 3.22681824227835, 'pm10': 2.3183160649668055}
Reading [ 5]: {'pm2.5': 6.571437982807612, 'pm10': 8.10732336965939}
Reading [ 6]: {'pm2.5': 2.215579055773339, 'pm10': 8.498171362504383}
Reading [ 7]: {'pm2.5': 8.027524718085807, 'pm10': 5.8429776102899025}
Reading [ 8]: {'pm2.5': 6.2517504261702515, 'pm10': 2.263619703316302}
...
Reading [60]: {'pm2.5': 5.775826608467894, 'pm10': 2.6825255819326377}
Uploading: {
    "token": "dummy-token-for-test-purpose-only",
    "station": {
        "id": "YOUR-SENSOR-ID",
        "location": {
            "latitude": 28.7501,
            "longitude": 77.1177
        }
    },
    "readings": [
        {
            "specie": "pm2.5",
            "min": 0.3844247110354293,
            "max": 9.881988173998357,
            "median": 5.775826608467894,
            "value": 5.370915456820213,
            "stddev": 2.6854456309512917
        },
        {
            "specie": "pm10",
            "min": 0.016951997552983045,
            "max": 9.79528005515607,
            "median": 5.114991470114239,
            "value": 4.877448712778561,
            "stddev": 2.8556849925322383
        }
    ]
}
Data successfully posted: {u'status': u'ok', u'station': 1000003}

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