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by Rasperry
Wed Jul 29, 2020 7:25 am
Forum: Networking and servers
Topic: I don't see full Gigabit internet speed on RPI 4b 4GB
Replies: 9
Views: 724

Re: I don't see full Gigabit internet speed on RPI 4b 4GB

Is it necessary to use gigabit switch (10000Mbs) for a cluster or is a fast ethernet switch (100Mbs) allright?
by Rasperry
Tue May 19, 2020 7:06 pm
Forum: General discussion
Topic: 5V 4-pin PWM Noctua A4X10 on Raspberry Pi
Replies: 49
Views: 35901

Re: 5V 4-pin PWM Noctua A4X10 on Raspberry Pi

Sorry for asking stupid questions ... Here on this scheme you can see how i have my 12 V fan connected to the power input (just the red and black of PWM are connected to the 12 V source) so the fan is running 100% ... https://imgur.com/DDUVagG https://i.imgur.com/DDUVagG.jpg But i would like to cont...
by Rasperry
Fri Mar 27, 2020 9:19 am
Forum: Networking and servers
Topic: I/O-Panel (USB 2/3, Ethernet, HDMI, Audio)
Replies: 0
Views: 131

I/O-Panel (USB 2/3, Ethernet, HDMI, Audio)

I am searching for something like that https://www.watercoolinguk.co.uk/p/Lian-Li-PW-IC2DAH85-I--O-panel-for-O-and-DK-series-USB-Type-C-HDMI_64424.html ... but with: -2x USB 2.0 - 2x USB 3.0 - 1x Ethernet - 1x HDMI - Audio (optionally!) - 12V--> 5V Step down converter (optionally!) - Power ON OFF sw...
by Rasperry
Tue Mar 10, 2020 1:43 pm
Forum: Other projects
Topic: Adressable RGB connected to GPIO pins on RPI4
Replies: 16
Views: 1819

Re: Adressable RGB connected to GPIO pins on RPI4

Everything worked no problem - thanks again! :)
by Rasperry
Thu Mar 05, 2020 12:56 pm
Forum: Beginners
Topic: Connecting of 12V with PWM regulator to GPIO pins?
Replies: 8
Views: 775

Re: Connecting of 12V with PWM regulator to GPIO pins?

For hardware, use a FET with a low enough gate voltage to work from the GPIO (3V3). That can drive a 12V fan. You may need an inverse parallel diode across the fan to reduce RF interference, but I doubt it. You will find circuits on the forum. https://www.ekwb.com/wp-content/uploads/2016/07/02-1.jp...
by Rasperry
Wed Mar 04, 2020 2:15 pm
Forum: General discussion
Topic: Raspberry Pi Cluster Computer?
Replies: 53
Views: 5790

Re: Raspberry Pi Cluster Computer?

What is usability of 4x Raspberry Pi 4s ... a lot of people use it or is it just a toy for some niche applications?
by Rasperry
Tue Mar 03, 2020 1:47 pm
Forum: Other projects
Topic: Adressable RGB connected to GPIO pins on RPI4
Replies: 16
Views: 1819

Re: Adressable RGB connected to GPIO pins on RPI4

OK, understood .. will get back when i test.
by Rasperry
Tue Mar 03, 2020 12:54 pm
Forum: Other projects
Topic: Adressable RGB connected to GPIO pins on RPI4
Replies: 16
Views: 1819

Re: Adressable RGB connected to GPIO pins on RPI4

In the tutorial above he also connected with 3.3 V pin on Raspberry and he also used Logic level converter - but i am not sure why? He says: "The Raspberry Pi uses 3.3V Logic, So we will need to use a Logic Level Converter to convert it to the 5V logic that WS2812/Neopixels require. " But ...
by Rasperry
Tue Mar 03, 2020 12:51 pm
Forum: Other projects
Topic: Adressable RGB connected to GPIO pins on RPI4
Replies: 16
Views: 1819

Re: Adressable RGB connected to GPIO pins on RPI4

Option 2: You will also need to connect the 0V/GND wire to the Pi. You mean to connect wire from PI to the ground of the converter or from PI to the ground of the LED strip? Sorry for asking n00b questions. I intended to try software from tutorial here: https://core-electronics.com.au/tutorials/ws2...
by Rasperry
Tue Mar 03, 2020 11:05 am
Forum: Other projects
Topic: Adressable RGB connected to GPIO pins on RPI4
Replies: 16
Views: 1819

Re: Adressable RGB connected to GPIO pins on RPI4

But i have a really short LED strip that needs to be connected (about 10 cm) and i got information that it consumes max. 1.2W - so i think this should be enough to power directly from the Raspberry? Or at least worth trying? If it wont be enough i can still use the 2. option from the picture below. ...
by Rasperry
Tue Mar 03, 2020 9:30 am
Forum: Other projects
Topic: Adressable RGB connected to GPIO pins on RPI4
Replies: 16
Views: 1819

Re: Adressable RGB connected to GPIO pins on RPI4

Hm ... but this is a must to use those LEDs in my case (WS2812B ... 1.2W power usage at max.). So it wouldnt work if i would connect it like this: 5V pin from LED strip to the GPIO 5V pin (PIN 2) Digital pin from LED strip to the GPIO 14 (TXD) pin (PIN 8) Ground pin from LED strip to the GPIO Ground...
by Rasperry
Tue Mar 03, 2020 8:47 am
Forum: Other projects
Topic: Adressable RGB connected to GPIO pins on RPI4
Replies: 16
Views: 1819

Re: Adressable RGB connected to GPIO pins on RPI4

The APA102 based LED strips are much easier to drive from the Pi. You have very few choices with a WS28xx based strip. Why easier? Also, i can probably connect all three cables (these https://www.conrad.si/prikljucni-kabel-za-raspberry-pireg%3b%2c-vecbarven%2c-rb-cb3-50) directly from GPIO to the L...
by Rasperry
Tue Mar 03, 2020 7:34 am
Forum: Other projects
Topic: Adressable RGB connected to GPIO pins on RPI4
Replies: 16
Views: 1819

Re: Adressable RGB connected to GPIO pins on RPI4

The whole LED strip consumes 1,2 W (0,24A) and has this type of connector - left one on the picture from the link below: https://i.imgur.com/PKSNRAl.jpg LED type: WS2812B 5050 +5V /Digital /Empty/ Ground I also use this transformator to convert 12 V to 5 V to power the 4x Raspberrys, so one way to p...
by Rasperry
Mon Mar 02, 2020 1:43 pm
Forum: Other projects
Topic: Adressable RGB connected to GPIO pins on RPI4
Replies: 16
Views: 1819

Adressable RGB connected to GPIO pins on RPI4

I would like to connect adressable RGB LED strip (with 9 LEDs) to GPIO pins on RPI4 and am asking if this is even possible - is there enough power output from GPIO pins to power the LEDs? Adressable rgb pins on the connector are: 5V, Digital, Empty (without pin) and Ground - so this should be OK? Is...
by Rasperry
Thu Feb 27, 2020 11:46 am
Forum: Beginners
Topic: Connecting of 12V with PWM regulator to GPIO pins?
Replies: 8
Views: 775

Re: Connecting of 12V with PWM regulator to GPIO pins?

"For hardware, use a FET with a low enough gate voltage to work from the GPIO (3V3). That can drive a 12V fan. You may need an inverse parallel diode across the fan to reduce RF interference, but I doubt it. You will find circuits on the forum." Can you please post an example of how this ...
by Rasperry
Thu Feb 27, 2020 9:38 am
Forum: Beginners
Topic: Connecting of 12V with PWM regulator to GPIO pins?
Replies: 8
Views: 775

Connecting of 12V with PWM regulator to GPIO pins?

I would like to connect 12V fan with outside power supply adapter but with PWM regulator in between, that would react to changing of the CPU temperature. So the bigger the temperature of the CPU the higher RPMs of the fan. The problem is i dont know how to connect: 1. Raspberry PI 4 GPIO pins 2. PWM...
by Rasperry
Wed Feb 26, 2020 7:26 am
Forum: Networking and servers
Topic: 2x RaspberryPi 4 connected over switch ... finding IP?
Replies: 8
Views: 821

Re: 2x RaspberryPi 4 connected over switch ... finding IP?

"avahi-browse" or any other command doesnt work.

But nevermind, i got now what i was searching for so thank you again and for long explanation :)
by Rasperry
Fri Feb 21, 2020 2:19 pm
Forum: Networking and servers
Topic: 2x RaspberryPi 4 connected over switch ... finding IP?
Replies: 8
Views: 821

Re: 2x RaspberryPi 4 connected over switch ... finding IP?

One more question ... i can get back IP address if i know the name of the specific RPI (default is: raspberrypi) with command: "ping raspberrypi.local" But to get ip's for all RPIs that are connected via switch (for instance i have 4), this command isnt working for me: "nmap -sn 192.1...
by Rasperry
Fri Feb 21, 2020 1:58 pm
Forum: Networking and servers
Topic: 2x RaspberryPi 4 connected over switch ... finding IP?
Replies: 8
Views: 821

Re: 2x RaspberryPi 4 connected over switch ... finding IP?

Ok thank you, i understand now and it works! :)
by Rasperry
Fri Feb 21, 2020 12:53 pm
Forum: Networking and servers
Topic: 2x RaspberryPi 4 connected over switch ... finding IP?
Replies: 8
Views: 821

Re: 2x RaspberryPi 4 connected over switch ... finding IP?

What exactly is

"ping <machine_name>.local"

"ssh <machine_user>@<machine_name>.local"


Can you give example of what to type, sorry for n00b questions ...
by Rasperry
Fri Feb 21, 2020 11:42 am
Forum: Networking and servers
Topic: 2x RaspberryPi 4 connected over switch ... finding IP?
Replies: 8
Views: 821

2x RaspberryPi 4 connected over switch ... finding IP?

I have one RPI4 connected to the monitor, with keyboard and mouse .... There is also the second RaspberryPi4 (with SSH enabled) which is connected to the first via ethernet switch. Is there a way to find IP of the second RPI via switch so i could connect from one to the other with ssh command? There...
by Rasperry
Sun Jan 26, 2020 5:49 pm
Forum: General discussion
Topic: Power Supply for multiple RAPI4B+
Replies: 44
Views: 19555

Re: Power Supply for multiple RAPI4B+

Would something like this be enough for a cluster of 4 RPI4B? https://www.amazon.com/dp/B00OQ19QYA?aaxitk=NitD-d0STZo2YJ3.JhjLOg&pd_rd_i=B00OQ19QYA&pf_rd_p=591760d1-6468-480f-9b10-0ee9c85706fd&hsa_cr_id=8738474010501&sb-ci-n=asinImage&sb-ci-v=https%3A%2F%2Fimages-na.ssl-images-am...

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