Mi-Fi and data quantity

FAQ
1

Hello,

I am studying the option to use a Mi-Fi in order to set low-cost sensors in places where there is no Wi-Fi.
I was wondering :

  • if anyone could recomment a cheap 4G Wi-Fi hotspot equipment
  • if anyone could tell me which amount of data I should buy in order to send PM1, PM2.5, PM10, HR and temperature measurements every 2mn30. I have no idea bout this.

Many thanks for your support,

Marie-Laure

2

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For thé amount of data just Look at the string which is sent. And calculate for 1 month : every 145 s a day

Why not use LoRaWAN? There is an experiment in Marmande

3

Hi @pjg,
I don’t feel ready for LoRaWAN but will check the Marmande initiative. This is so cool !
Do you have the link to find the router ? Is is possible to leave it plugged all the time ?
I will calculate the data amount with your technique, thanks a lot !

4

The data amount is more ore less this x 4 (2 sensors for Sensor.Community API + Madavi):

header

Content-Type: application/json  
X-Pin: 1  
X-Sensor: esp8266-12345678

Data

{
  "software_version": "your_version", 
  "sensordatavalues":[
    {"value_type":"P1","value":"66.04"},
    {"value_type":"P2","value":"53.32"}
  ]
}

https://de.aliexpress.com/item/1005003150996775.html?src=google&src=google&albch=shopping&acnt=494-037-6276&slnk=&plac=&mtctp=&albbt=Google_7_shopping&albagn=888888&isSmbAutoCall=false&needSmbHouyi=false&albcp=14921089886&albag=125165580221&trgt=489474619664&crea=de1005003150996775&netw=u&device=c&albpg=489474619664&albpd=de1005003150996775&gclid=EAIaIQobChMIvvfF5_rd8wIVSuPmCh23ogFPEAQYASABEgIwFfD_BwE&gclsrc=aw.ds&aff_fcid=feb7f57a7e6e48e49abb685c8228353a-1634903681533-01710-UneMJZVf&aff_fsk=UneMJZVf&aff_platform=aaf&sk=UneMJZVf&aff_trace_key=feb7f57a7e6e48e49abb685c8228353a-1634903681533-01710-UneMJZVf&terminal_id=ffc0df34a7be41a7ac6cbcda39165cbf

It also exist in France (the aliexpress one should be compatible but providers also have some)

It should be able to stay on as long as the battery is not empty

1 Like
5

Actually if you’ve got an old iphone, it should work…

6

Thanks a lot ! I am using your figures to make the data calculation :slight_smile:
Regarding the router, I am rather looking for a non mobile option where I could leave it for a few months plugged to the power supply without even checking it. The iphone idea is great !

7

Also check the weight of the POST request itself it should also make a few bytes

1 Like
8

And you should disable HTTPS for such a transmission. This is generating a hugh overhead.

9

Hi @ricki-z , is it possible to do this in the config panel ? Thanks

10

Yes you can deactivate HTTPS by unchecking the approptiate boxes.

1 Like