Příklad 1

{ 
	"token": "......", 
	"station": { 
		"id": "station-001", 
		"name": "HCPA Santa Cecília", 
		"latitude": 103.37893, 
		"longitude": 43.17108, 
	}, 
	"org": { 
		"website":"https://pacto.upsensor.com/", 
		"name":"Porto Ar Alegre", 
	}, 
	"readings": [ 
		{"time":"2024-09-19T09:59:33+09:00","specie":"pm2.5", "value": 393.3, "unit":"mg/m3", "min":390.3, "max": 402.3, "stddev": 0.332},  
		{"time":"2024-09-19T09:59:33+09:00","specie":"pm10", "value": 109.3, "unit":"mg/m3"}, 
		{"time":"2024-09-19T09:59:33+09:00","specie":"co2", "value": 459.3, "unit":"ppb"}, 
		{"time":"2024-09-19T09:59:33+09:00","specie":"temp", "value": 26.8, "unit":"C"}, 
	] 
}

Příklad 2

{ 
	"token": "......", 
	"station": { 
		"id": "station-001", 
	}, 
	"readings": [ 
		{"specie":"pm2.5", "value": 393.3} 
	] 
}

Tento kód můžete použít pro nepřetržité čtení ze senzoru SDS a nahrávání každou minutu: (skript je také dostupný na https://github.com/aqicn/sds-sensor-reader ).

import requests 
import random 
import time 
import math 
import json 
import sys 
from serial import Serial 
 
LOCATION = {'latitude': 28.7501, 'longitude': 77.1177} 
TOKEN    = "dummy-token-for-test-purpose-only" 
SENSORID = "station-001" 
USBPORT  = "/dev/ttyUSB0" 
 
class SensorDataUploader: 
 
    def __init__(self, station, token): 
        self.token = token 
        self.station = station 
 
 
    def send(self,readings): 
 
        params = {'station':self.station,'readings':readings,'token':self.token}  
        print("Uploading: %s"%json.dumps(params, indent=4)) 
 
        request = requests.post( url = "https://aqicn.org/sensor/upload/",  json = params) 
        data = request.json()  
        if data["status"]!="ok": 
            print("Something went wrong: %s" % data) 
        else: 
            print("Data successfully posted: %s"%data) 
 
 
 
 
class Accumulator: 
 
    def __init__(self, name): 
        self.name = name 
        self.values = [] 
 
    def add(self,val): 
        self.values.append(val) 
 
    def count(self): 
        return len(self.values) 
 
    def reset(self): 
        self.values=[] 
 
    def min(self): 
        return self.values[0] 
 
    def max(self): 
        return self.values[len(self.values)-1] 
 
    def median(self): 
        return self.values[len(self.values)/2] 
 
    def mean(self): 
        return float(sum(self.values)) / len(self.values) 
 
    def stddev(self): 
        l = len(self.values) 
        mean = self.mean() 
        return math.sqrt(float(reduce(lambda x, y: x + y, map(lambda x: (x - mean) ** 2, self.values))) / l) 
 
 
    def summary(self): 
        self.values.sort() 
        return {"specie":self.name,'value':self.mean(),'min':self.min(),'max':self.max(),'median':self.median(), 'stddev':self.stddev()}  
 
 
 
class DummyReader: 
 
    def read( self ): 
 
        time.sleep(1.1) 
        return {"pm2.5":random.random()*10,"pm10":random.random()*10} 
 
 
class SDS011Reader: 
 
    def __init__(self, inport): 
        self.serial = Serial(port=inport,baudrate=9600) 
        self.values = [] 
        self.step = 0 
 
    def read( self ): 
 
        # time.sleep(1) 
        # return {"pm2.5":random.random()*100,"pm10":random.random()*100} 
 
        while self.serial.inWaiting()!=0: 
            v=ord(self.serial.read()) 
 
            if self.step ==0: 
                if v==170: 
                    self.step=1 
 
            elif self.step==1: 
                if v==192: 
                    self.values = [0,0,0,0,0,0,0] 
                    self.step=2 
                else: 
                    self.step=0 
 
            elif self.step>8: 
                self.step =0 
                pm25 = (self.values[0]+self.values[1]*256)/10 
                pm10 = (self.values[2]+self.values[3]*256)/10 
                return {"pm2.5":pm25,"pm10":pm10} 
 
            elif self.step>=2: 
                self.values[self.step-2]=v 
                self.step= self.step+1 
 
        return None 
 
 
 
def readAndUpload(sensor, uploader): 
 
    try: 
 
        while True: 
            accumulators = {} 
            startTime = time.time() 
 
            while time.time() < startTime+60: 
                values = sensor.read() 
                if values==None: 
                    continue 
 
                print("Reading [%2d]: %s"%(int(time.time()-startTime),values)) 
                for specie, value in values.items(): 
                    if not (specie in accumulators): 
                        accumulators[specie]=Accumulator(specie) 
                    accumulators[specie].add(value) 
 
 
            readings = [] 
            for specie, accumulator in accumulators.items(): 
                readings.append(accumulator.summary()) 
 
            if len(readings)>0: 
                uploader.send(readings) 
            else: 
                print("No value read from the sensor...") 
 
 
    except KeyboardInterrupt: 
        print "Bye" 
        sys.exit() 
 
 
 
print("Starting reading sensor "+SENSORID+" on port "+USBPORT) 
 
# Station parameter   
station = {'id':SENSORID, 'location':LOCATION} 
uploader = SensorDataUploader(station, TOKEN) 
 
sensor = SDS011Reader(USBPORT) 
# sensor = DummyReader() 
readAndUpload(sensor,uploader)