temperature readings with ds18b20 1 wire sensor

Submitted by Guest on Tue, 06/08/2013 - 02:02

Hi guys,

I am trying to read a sensor temp from the gpio of raspberry pi...

I don't know how to send data to emoncms :S

I don't understand correctly the work flow from imput->feed->dashboard, maybe to easy, and i don't understand it, i don't know.

Is there any documentation about protocol formats or something...it seems easy from the cms, but I don't know what I need.

Firstly i will do it with bash, for testing, after with c language, I don't know maybe its easy and I don't get the point :S

I can Already see the temps from the ds18b20 sensor, using bash...but i don't know how to log them to emoncms...

I created a input called room_temp, and a feed for it...afther that I assigned the feed to the graphs in dashboard...but i think I need some programing to send data to emoncms right?

Can any one help me with the workflow of this?

Thanks in advance

Re: temperature readings with ds18b20 1 wire sensor

Submitted by tuxd3v (not verified) on Tue, 06/08/2013 - 04:32.

Hi,

I created a input for server temp...

Node: name Description Process list

1 1 server_temp log

after that a feed have benn created:

Id Name Tag Datatype Public Updated Value

5 server_temp REALTIM "private" inactive 0.00

using jason api helper... I am doing this...

#!/bin/bash

while :

info_temp0=$(/opt/vc/bin/vcgencmd measure_temp)

temp0=${info_temp0:5:4}

echo $temp0

curl "http://localhost/emoncms/input/post.json?json={server_temp:$temp0}"

sleep 5

done

but the feed appears inactive :S?!

Nothing happens... In dash I associated a gauge...but I don't get feedback from emoncms!

What i need to do?

thanks in advance

regards tux

Re: temperature readings with ds18b20 1 wire sensor

Submitted by Mattia Rossi on Tue, 06/08/2013 - 04:55.

You need to add the api write key for the user you are logging data for to the url as detailed in /emoncms/input/api

Regards

Re: temperature readings with ds18b20 1 wire sensor

Submitted by tuxd3v (not verified) on Tue, 06/08/2013 - 05:53.

Ok...

I got it :S

its to much easy... kudos for you guys...the inputs are created automatically with APIKey.

I have a problem now with the returning Ok string...

I am redirecting the output "ok" to /dev/null...but curl will show some statistic data...

To solve that we can use -s(to suppress this statistic data when redirecting or when a error ocurrs)

I readed some where that apikey puts some more processing on the server side...maybe because of validation key?is that processing power very high?

EDIT: in the smoothie graph visualization...what the parameter Ufac means??

thanks in advance

regards

tux

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