Raspberry fan control, Node-Red

-

Updated 2021-07-01 !

Do You want to have control over the Raspberry Pi(RPi) ? 

Functions
  • CPU Temperature
  • CPU Load %
  • Free RAM %
  • Disk Usage %
  • Shutdown and Reboot buttons
  • Fan PWM control via GPIO
Other NR posts on this site

Introduction
The above functions is implemented with Node-Red(NR) and I got inspiration from these sources
At the bottom, in the dashboard, there are functions to 
  • Shutdown
  • Reboot
  • Override the fan to 100% output
Fan control
The fan PWM control is realized with the circuit shown in the picture. The fan is connected to +12V DC since this is used in a boat application. You could use a 5V DC fan but then my recommendation is a separate supply, not using the RPi supply.

If the fan speed versus the CPU temperature don't match Your setup change the code in the "PWM Fan Control" node.

Measurements
 The measures are made every 15 second and the CPU measure is "user space processes". A user space program is any process that doesn't belong to the kernel.

NR flow
Install the "node-red-dashboard" and "node-red-node-pi-gpio" node and then import the json file, from Github, to NR and check it out.
Remarks
2019-08-08 Refactored the Java code. OVERRIDE button code updated. Fan always on at least 20 %

Comments

  1. JeremyY8831 December 2024 at 02:04

    Thank You so much for this. I'm running Pi5,Openplotter, Signal K and am very new to NR. I followed these instructions and got it working without any issues - brilliant!!

    ReplyDelete

Post a Comment

Feel free to leave a comment ! ... but due to a lot of spam comments I have to moderate them. Will reply ASAP !

Popular post, last 30 days

Raspberry Pi OS Lite with GUI, RDP, VNC, Chromium

-
Image
Updated 2024-07-01 ! I like the Raspberry Pi(RPi), with Raspberry Pi OS Lite (no Desktop is included), headless operation, and then adding the software You need. Until now I haven't had a use case where I needed a Desktop but now was time.  Why don't use the Raspberry Pi OS with Desktop ?? In that package there is a lot of software I don't need and I really want to optimize the RPi. I think that the less software You install the happier RPi will be... 😉
Read more =>

NetworkManager UI and access point, hotspot

-
Image
Updated 2023-10-12 ! In a former post I shared some thoughts about how to start using NetworkManager (NM), on a Raspberry, and here I will continue with additional examples that can help with network setup. NMTUI is NetworkManager text UI which can handle the most common tasks in a easy way. An access point or hotspot will be configured. " sudo nmcli connection edit xxxx " is a command that guides you throw a change of parameters.
Read more =>

iCloud drive sync, or mount, with a Linux, Ubuntu, device

-
Image
Updated 2025-01-23 ! With my project to keep a MacBook Air 2011(MBA) alive , Ubuntu installed, i searched for a solution where my iCloud drive(iCD) was  continuous synced with my MBA. This must work both ways so even a file change made on MBA should be replicated to iCD. rclone now, 2025-01, works with iCloud !! Setup below !! Before "rclone" was working with iCloud I solved my sync between iCD and MBA with Syncthing (ST). Check below. ST doesn't sync with iCloud so the work around here was to use my MacMini, Mac OS, as the "Middle man". It's always on and synced with iCD.
Read more =>

Installing Ubuntu 24.04 or 24.10/25.04 on an old MacBook Air(2011)

-
Image
Updated 2025-05-20 ! I have done several posts Blogging about how to keep an old MacBook Air(MBA), mid 2011(A1369), with SSD disk "alive". I have used the fantastic software package OpenCore Legacy patcher to upgrade the Mac to the latest Mac OS.  A while ago i tested Mac OS  Sequoia (15.3), on the mentioned Mac, but I had to admit that it was to much for the 14 year old companion. I really like the Mac and everything works, after a battery change , so it ended up with installing  Ubuntu 24.04.2 LTS  or if you want the latest scroll down and get Ubuntu 24.10/25.04.
Read more =>

Signal K quick install, Raspberry Pi, Ubuntu

-
Image
Updated 2025-06-23 ! I have got some questions installing, just,  Signal K (SK) so will do a summary with links. Signal K is the hub to receive data, from different devices in different data formats, and send it on to different equipment, or databases, in different formats. Most common for standard marine equipment are the old NMEA 0183 and the newer NMEA 2000 protocol which is also handled.  Besides the SK "hub" function developers  have  created  plugins  for different purposes. This is due to that  SK is open-source ! Sharing is caring ! In this post you can check the devices I'm using connected to the SK server and also my setup.
Read more =>

Clone the Raspberry boot disk

-
Image
Updated 2024-02-20 ! A very nice way to fix a backup is to make a copy, bootable, of the actual SD card You are using on the Raspberry Pi(RPi). This will be done even when the RPi is up and running ! This application can also be used to make a bootable SSD or USB drive !! You clone from the command line so You don't need the standard GUI, Pixel, and the " SD card copier "  function. It is also possible to set up a a scheduled job, cronjob explained later, which for example makes a clone every night at 1 o'clock.
Read more =>

SeaTalk1 to NMEA 0183 converter, DIY

-
Image
Updated 2024-08-30 !  !! Another SW solution is available for RPi 5 here !  using the same HW. Thanks to Thomas, (the guy with the nice marine interface board ) ,  it's now possible  to decode, one way, the SeaTalk1(ST1) sentences in a pretty simple way. You just  use OpenPlotter(OP) and/or SignalK(SK) and an  Optocoupler . The thing that made it, is that Thomas   has released a "how to" and  Python source code , that will read the data from a GPIO pin on the Raspberry Pi, (RPi), and format it so the standard parser in SignalK can translate it to SignalK delta format. It is then  available as NMEA 0183. It's even possible to send the data in to a NMEA 2000 network, with a proper hardware interface.
Read more =>

Volvo Penta NMEA 2000 Gateway

-
Image
Updated 2021-06-15 It's always nice to have ALL information at the same place, navigator/plotter, when You are out with the boat.  What could be missing is the engine information/data. If You have a Volvo Penta from 2006 or later it could be pretty easy. There are some "standard" NMEA 2000 gateways to choose from, for example;  Volvo Penta has it's own 22813366, 3889758 Raymarine ECI-100 Maretron J2K100 .....
Read more =>

Waveshare CAN hat with Signal K & OpenPlotter

-
Image
Updated 2024-07-08 To get information from the NMEA 2000(N2K) network, to the RPi, I have been using  Actisense NGT-1 , for a long time,  and later also the  Yacht Devices YDWG 02  but now it was time for a Raspberry Pi(RPi) CAN hat(CH) from Waveshare(WS). WS have 3 different models but I picked the 2 channel isolated one . It's recommended to use an isolated one which also is demanded for those interfaces which can be approved by the N2K group.
Read more =>

Raspberry Pi 2, 3, 4, 5 USB SSD or USB drive boot

-
Image
Updated 2024-06-06 ! After having tested several methods creating a bootable USB SSD, or other USB drive, for Raspberry Pi(RPi) 3 4 and 5, I finished with this simple method Create the setup you want on a ordinary SD card(Or use existing) Make a bootable backup/clone of the SD card saving it to the USB SSD Remove the SD card and boot from the USB SSD Having a RPi 4, 5 ? Use this post on how to write the OS direct to the SSD.  
Read more =>