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Forum Index : Microcontroller and PC projects : Pi-cromite: IOT with ThingSpeak

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matherp
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Joined: 11/12/2012
Location: United Kingdom
Posts: 10565

Posted: 01:44pm 30 Nov 2017

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This example shows how to log data to Thingspeak with the Pi-cromite. It uses the Pi-cromite's TCP client capability. The code measures the temperature every 30 seconds and then uploads the current temperature and the running maximum and minimum to Thingspeak. I was surprised how easy this was

option explicit
option default none
Dim m$,s$, n$, api_key$="my Write API Key"
Dim float current,maxtemp=-1000.0,mintemp=1000.0
m$="GET http://api.thingspeak.com/update?api_key="+api_key$+"&field1="
Do
TCP client "184.106.153.149",80 'fixed address for Thingspeak HTTP
current=DS18B20(33)
If current>maxtemp Then maxtemp=current
If current<mintemp Then mintemp=current
s$=m$+Str$(current)+"&field2="+Str$(maxtemp)+"&field3="+Str$(mintemp)
s$=s$+Chr$(13)+Chr$(10)
Print s$;
TCP send s$
Pause 1000
TCP receive n$ 'clear the TCP receive buffer
TCP close
Pause 29000
Loop

You can see the cold UK temperature here

Edited by matherp 2017-12-02

kg4pid
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Joined: 08/03/2015
Location: United States
Posts: 50

Posted: 05:41pm 30 Nov 2017

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I'm trying to follow your code but I don't see where you provide a login/user name along with a password. In looking at the web page I see a 'channel id'. Why do I not see this in the code?

While it looks simple, there must more code/setting that are somewhere else.

MaxEdited by kg4pid 2017-12-02

Phil23
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Joined: 27/03/2016
Location: Australia
Posts: 1667

Posted: 08:41pm 30 Nov 2017

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It's probably in the first line below,
api_key$=

Uses an api key instead of username/pwd by the look of it.

matherp said

Dim m$,s$, n$, api_key$="my Write API Key"
Dim float current,maxtemp=-1000.0,mintemp=1000.0
m$="GET http://api.thingspeak.com/update?api_key="+api_key$+"&field1="
..
..

Edited by Phil23 2017-12-02

matherp
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Joined: 11/12/2012
Location: United Kingdom
Posts: 10565

Posted: 08:29am 01 Dec 2017

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Quote While it looks simple, there must more code/setting that are somewhere else.

There isn't otherwise I would have included it.

The Write API Key is the username/password and channel id combined on ThingSpeak which is why I didn't include my key

Azure

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Joined: 09/11/2017
Location: Australia
Posts: 446

Posted: 09:57am 01 Dec 2017

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I thought you were going to share

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