{"id":2436,"date":"2019-02-21T20:32:53","date_gmt":"2019-02-21T19:32:53","guid":{"rendered":"https:\/\/www.nerdiy.de\/?p=2436"},"modified":"2021-12-18T18:11:07","modified_gmt":"2021-12-18T17:11:07","slug":"nodered-warning-if-air-humidity-is-too-high","status":"publish","type":"post","link":"https:\/\/nerdiy.de\/en\/nodered-warning-if-air-humidity-is-too-high\/","title":{"rendered":"HowTo: Node Red \u2013 Warning if humidity is too high"},"content":{"rendered":"

Especially in rooms where a lot of work is done with water or steam, you should always ventilate sufficiently to avoid damage and health risks caused by mold.<\/p>\n

If you're one of those people who tend to forget things like this and happen to have a humidity sensor in the rooms in question, which also happens to be connected to your NodeRed installation, you can also be automatically reminded when the humidity is too high.<\/p>\n

How to do this is described in the following article.<\/p>\n

\n

Safety instructions <\/span><\/h2>\r\n

I know the following notes are always kind of annoying and seem unnecessary. Unfortunately, many people who knew "better" have lost eyes, fingers or other things due to carelessness or injured themselves. Data loss is almost negligible in comparison, but even these can be really annoying. Therefore, please take five minutes to read the safety instructions. Because even the coolest project is not worth injury or other trouble.<\/span>
https:\/\/www.nerdiy.de\/sicherheitshinweise\/<\/span><\/a><\/em><\/strong><\/p>\r\n

Affiliate links\/advertising links<\/h2>\r\n

The links to online shops listed here are so-called affiliate links. If you click on such an affiliate link and make a purchase via this link, Nerdiy.de will receive a commission from the relevant online shop or provider. The price does not change for you. If you make your purchases via these links, you support Nerdiy.de in being able to offer other useful projects in the future. \ud83d\ude42\u00a0<\/em><\/p>\n

\n

Requirements<\/h2>\n

Helpful articles:
\n<\/strong>To be able to use this configuration, NodeRed should of course already be installed.
\nHow to prepare a RaspberryPi and then install NodeRed on it is described in the following articles.<\/p>\n

The following articles describe what has to be done to prepare the RaspberryPi so far:
\nRaspberryPi \u2013 setup for nerdiys!<\/a><\/em><\/strong>
\nRaspberryPi \u2013 The first configuration!
\n<\/a>RaspberryPi \u2013 Control the RaspberryPi via SSH<\/a><\/em><\/strong>
\nNodeRed \u2013 Installing NodeRed on the RaspberryPi<\/a><\/em><\/strong>
\nNodeRed \u2013 Install new nodes<\/em><\/strong><\/a><\/p>\n

Required material:
\n<\/strong>-no-
\n<\/strong><\/p>\n

Required material:<\/strong><\/p>\n

In the following list you will find all the parts you need to implement this article.<\/strong><\/p>\n

\n \n \n \n \n \n \n \n \n <\/colgroup>\n <\/table>\n \n \n \n<\/div>\n\n
\n

Log into the NodeRed configuration interface<\/h2>\r\n

Before you can edit your NodeRed configuration, you must - if activated - first log into the NodeRed configuration interface.<\/p>\r\n

\"\"<\/a>
View of the login dialog. Here you have to enter the login data that you specified during the configuration of the login. You can find information about this in the article NodeRed - set up user login<\/strong><\/em><\/a>.<\/figcaption><\/figure>\n
\n

Need to install nodes<\/h2>\n

For this example, in addition to the standard nodes, the nodes \u201cnode-red-node-pushbullet\u201d and \u201cnode-red-dashboard\u201d are also used. In order for this example to work for you, you have to install these nodes. How your node is installed in the article\u00a0NodeRed \u2013 Install new nodes<\/em><\/strong><\/a> described.<\/p>\n

\n

Import node code<\/h2>\n

The core function of this example is to create a moving average from the most recent humidity values and then check whether this exceeds a certain value. In this context, moving average means that the average is always determined from the last (for example) ten measured values. This has the advantage that one-time peaks in the measured values do not cause an alarm. Only a permanent increase in humidity causes the value of the moving average to rise above the set limit and thus trigger an alarm.<\/p>\n

To import this example into your NodeRed installation, you need to import the Node code below. You can find tips on this in the article NodeRed \u2013 Import and export node code.<\/a><\/strong><\/em><\/p>\n

After importing, remember to position the dashboard nodes on your dashboard. You can find tips on this in the article NodeRed - Create a user interface with dashboard nodes<\/a><\/strong><\/em>.<\/p>\n

You may also need to provide an API key for the Pushbullet node. This is also in the article Register Pushbullet API Key<\/strong><\/em><\/a>\u00a0described.<\/p>\n

\"\"<\/a>
Node configuration view in the NodeRed editor.<\/figcaption><\/figure>\n
\"\"<\/a>
View of the limit setting option in the dashboard.<\/figcaption><\/figure>\n
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\n
Adjust values<\/h2>\n
In this configuration, two values determine the function.
\nOn the one hand, there is the limit value, which determines at what humidity level an alarm is issued. This can be set directly via the dashboard node.<\/p>\n
On the other hand, by increasing or decreasing the number of values from which the moving average is determined, you can control how \u201cslowly\u201d - but more precisely - the alarm reacts. If the moving average refers to very few values, changes (and also exceeding the limit value) are detected more quickly. Unfortunately, even very short-term changes in measured values such as measurement errors can lead to the alarm being triggered incorrectly.<\/p>\n
It's best to experiment a little with the values and see what's best for your case. In this example, the limit value is 70% humidity with ten values on which the moving average is based.<\/p>\n
\"\"<\/a>
In the configuration of the smooth node you can set in the \u201cover the most recent\u2026values\u201d field how many values the moving average is formed over.<\/figcaption><\/figure>\n
\n
Have fun with the project<\/h2>\r\n
I hope everything worked as described for you. If not or you have questions or suggestions please let me know in the comments. I will then add this to the article if necessary.
Ideas for new projects are always welcome. \ud83d\ude42<\/p>\r\n
PS Many of these projects - especially the hardware projects - cost a lot of time and money. Of course I do this because I enjoy it, but if you think it's cool that I share the information with you, I would be happy about a small donation to the coffee fund. \ud83d\ude42<\/strong><\/p>\r\n
\"Buy<\/a>\u00a0 \u00a0 \u00a0 \u00a0   \"\"<\/p>","protected":false},"excerpt":{"rendered":"
Especially in rooms where you \"work\" a lot with water or water vapor, you should always ventilate sufficiently to avoid damage and health hazards caused by mold. If you are one of the [...]<\/p>","protected":false},"author":1,"featured_media":2437,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_bbp_topic_count":0,"_bbp_reply_count":0,"_bbp_total_topic_count":0,"_bbp_total_reply_count":0,"_bbp_voice_count":0,"_bbp_anonymous_reply_count":0,"_bbp_topic_count_hidden":0,"_bbp_reply_count_hidden":0,"_bbp_forum_subforum_count":0,"_jetpack_newsletter_access":"","_jetpack_dont_email_post_to_subs":false,"_jetpack_newsletter_tier_id":0,"_jetpack_memberships_contains_paywalled_content":false,"_jetpack_memberships_contains_paid_content":false,"footnotes":"","jetpack_publicize_message":"","jetpack_publicize_feature_enabled":true,"jetpack_social_post_already_shared":true,"jetpack_social_options":{"image_generator_settings":{"template":"highway","default_image_id":0,"font":"","enabled":false},"version":2},"jetpack_post_was_ever_published":false},"categories":[149,113,24,61],"tags":[33,114,25,47,48,50,229,51],"class_list":["post-2436","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-abendprojekt2h","category-node-red","category-raspberry-pi","category-smarthome","tag-automatisierung","tag-nodered","tag-raspberrypi","tag-raspi","tag-raspian","tag-sensoren","tag-smart","tag-smarthome"],"yoast_head":"\nHowTo: Node Red - 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January 2022","format":false,"excerpt":"Der IKEA STYRBAR Taster ist etwas gr\u00f6\u00dfer als der kleine Bruder der Ikea TRADFRI E1743 Taster. Daf\u00fcr bietet er aber auch ein paar mehr Funktion und - aufgrund der zwei eingesetzten AA Batterien - eine l\u00e4ngere Batterielebensdauer. 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