PMS7003顆粒度傳感器數據採集
PMS7003採集
整體介紹
樹莓派+PMS7003+1.44寸TFT屏幕
20秒採集一次數據
60秒鐘上傳一次心跳
語言：python
接口：webapi post
PMS7003傳感器介紹
Dust Sensor - PMS 5003/6003/7003: 數據鏈接.
PMS 7003: github鏈接.
數據位介紹
以下是PMS7003的數據位。
採集方法
由於PMS7003的傳輸過來數據需要先轉換成16進制 才能被程序計算，所以前置步驟，需要進行轉換。
# 字符轉換16 進制
def hexShowNew(argv):
try:
result = ''
hLen = len(argv)
for i in range(hLen):
hvol = argv[i]
hhex = '%02x' % hvol
result += hhex + ' '
# print(result)
return result
except:
pass
同時數據傳輸過來的話可能異常數據，所以一定要計算校驗位。
一共32個數據，前30個數據想加的值，是否等於後2個數據的值。
我這邊圖方便，全部轉換成10進制數據來計算。
for index in range(0,29) :
checksum += int(strarr[index],16)
其中這些數據是我們要的：
pm1point0 = strarr[4] + strarr[5]#pm1.0
pm2point5 = strarr[6] + strarr[7]#pm2.5
pm10 = strarr[8] + strarr[9]#pm10
pm1point0air = strarr[10] + strarr[11]#pm1.0
pm2point5air = strarr[12] + strarr[13]#pm2.5
pm10air = strarr[14] + strarr[15]#pm10
um0point3 = strarr[16] + strarr[17]#0.3um顆粒
um0point5 = strarr[18] + strarr[19]#0.5um顆粒
um1point0 = strarr[20] + strarr[21#1.0um顆粒
um2point5 = strarr[22] + strarr[23]#2.5um顆粒
um5point0 = strarr[24] + strarr[25]#5.0um顆粒
um10 = strarr[26] + strarr[27]#10um顆粒
以下是程序源碼：
# -*- coding: utf-8 -*
# python -u 啓動，禁用stdout緩衝功能，不然打印有延時。
import serial
import time
import sys
import socket
import json
import requests
#
class ParticleOutputModel:
hostname = ''
uuid = ''
machinetype = ''
flag = ''
pm1point0 = 0
pm2point5 = 0
pm10 = 0
pm1point0air = 0
pm2point5air = 0
pm10air = 0
over0point3um = 0
over0point5um = 0
over1point0um = 0
over2point5um = 0
over5point0um = 0
over10um = 0
def __init__(self,hostname,uuid,machinetype,flag,pm1point0,pm2point5,pm10,pm1point0air,pm2point5air,pm10air,over0point3um,over0point5um,over1point0um,over2point5um,over5point0um,over10um):
self.hostname = hostname
self.uuid = uuid
self.machinetype = machinetype
self.flag = flag
self.pm1point0 = pm1point0
self.pm2point5 = pm2point5
self.pm10 = pm10
self.pm1point0air = pm1point0air
self.pm2point5air = pm2point5air
self.pm10air = pm10air
self.over0point3um = over0point3um
self.over0point5um = over0point5um
self.over1point0um = over1point0um
self.over2point5um = over2point5um
self.over5point0um = over5point0um
self.over10um = over10um
# 打開串口
ser = serial.Serial("/dev/ttyAMA0", 9600)
def is_open(filename):
try:
vHandle =win32file.CreateFile(filename, GENERIC_READ, 0, None, OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, None)
if int(vHandle)==INVALID_HANDLE_VALUE:
print("# file is already open")
return True # file is already open
win32file.CloseHandle(vHandle)
except Exception as e:
print(e)
return True
# 16 進制
def hexShowNew(argv):
try:
result = ''
hLen = len(argv)
for i in range(hLen):
hvol = argv[i]
hhex = '%02x' % hvol
result += hhex + ' '
# print(result)
return result
except:
pass
# main方法：
def main():
host = 'localhost'
port = 7002
while True:
try:
print("create connection success")
while True:
count = ser.inWaiting()
if count > 30:
# 讀取內容並回顯
recv = ser.read(count)
strvalue = hexShowNew(recv)
strarr = strvalue.split()
if (len(strarr) == 32):
print("################################")
print("load data success")
checksum=0
for index in range(0,29) :
checksum += int(strarr[index],16)
print("checksum")
print(checksum)
print("systemchecksum")
syschecksum = int(str(strarr[30])+str(strarr[31]),16)
print(syschecksum)
if checksum == syschecksum:
print("checksum is success")
pm1point0 = strarr[4] + strarr[5]
pm2point5 = strarr[6] + strarr[7]
pm10 = strarr[8] + strarr[9]
pm1point0air = strarr[10] + strarr[11]
pm2point5air = strarr[12] + strarr[13]
pm10air = strarr[14] + strarr[15]
um0point3 = strarr[16] + strarr[17]
um0point5 = strarr[18] + strarr[19]
um1point0 = strarr[20] + strarr[21]
um2point5 = strarr[22] + strarr[23]
um5point0 = strarr[24] + strarr[25]
um10 = strarr[26] + strarr[27]
resultstr = "<ParticleDetection><Flag>[Flag]</Flag><PM1.0>[PM1.0]</PM1.0><PM2.5>[PM2.5]</PM2.5><PM10>[PM10]</PM10><PM1.0air>[PM1.0air]</PM1.0air><PM2.5air>[PM2.5air]</PM2.5air><PM10air>[PM10air]</PM10air><over0.3um>[over0.3um]</over0.3um><over0.5um>[over0.5um]</over0.5um><over1.0um>[over1.0um]</over1.0um><over2.5um>[over2.5um]</over2.5um><over5.0um>[over5.0um]</over5.0um><over10um>[over10um]</over10um></ParticleDetection>"
resultstr = resultstr.replace("[Flag]", "success")
resultstr = resultstr.replace("[PM1.0]", str(int(pm1point0, 16)))
resultstr = resultstr.replace("[PM2.5]", str(int(pm2point5, 16)))
resultstr = resultstr.replace("[PM10]", str(int(pm10, 16)))
resultstr = resultstr.replace("[PM1.0air]", str(int(pm1point0air, 16)))
resultstr = resultstr.replace("[PM2.5air]", str(int(pm2point5air, 16)))
resultstr = resultstr.replace("[PM10air]", str(int(pm10air, 16)))
resultstr = resultstr.replace("[over0.3um]", str(int(um0point3, 16)))
resultstr = resultstr.replace("[over0.5um]", str(int(um0point5, 16)))
resultstr = resultstr.replace("[over1.0um]", str(int(um1point0, 16)))
resultstr = resultstr.replace("[over2.5um]", str(int(um2point5, 16)))
resultstr = resultstr.replace("[over5.0um]", str(int(um5point0, 16)))
resultstr = resultstr.replace("[over10um]", str(int(um10, 16)))
x = ParticleOutputModel("raspberry","sssss","machinetype","success",int(pm1point0, 16),int(pm2point5, 16),int(pm10, 16),int(pm1point0air, 16),int(pm2point5air, 16),int(pm10air, 16),int(um0point3, 16),int(um0point5, 16),int(um1point0, 16),int(um2point5, 16),int(um5point0, 16),int(um10, 16))
#對象序列化
x= x.__dict__
json_str = json.dumps(x,ensure_ascii=False,indent=4)
try:
with open('./data.json', 'w') as file_object:
file_object.write(json_str)
except:
print('error:')
headers = {'Content-Type': 'application/json'}
r = requests.post("http接口", data=json_str, headers=headers,timeout=5)
print("send success")
time.sleep(20)
else:
time.sleep(2)
print("checksum is error")
else:
print("load data fail, no transaction")
ser.flushInput()
time.sleep(0.5)
except:
print("exception")
time.sleep(20)
if __name__ == '__main__':
try:
main()
except KeyboardInterrupt:
if ser != None:
ser.close()
最後會先保存一份json文件在本地，同時調用Post接口傳到接口，存到數據庫中。
有另一個程序會把存在本地的json文件，讀取出來，並顯示在1.44寸的TFT屏幕界面上。