Raspberry Pi Forums

Havinit

Can someone explain the current rating on the fans? That is to say: Above is cited a fan that is marked 5V =-=-= 0.20A. It is marketed as being safe for use on 3V3. My fan (same brand and presumably comparable in other regards) is 5V =-=-= 0.10A. Does this mean it is more or less likely to be safe ...

Havinit

Can someone explain the current rating on the fans? That is to say: Above is cited a fan that is marked 5V =-=-= 0.20A. It is marketed as being safe for use on 3V3. My fan (same brand and presumably comparable in other regards) is 5V =-=-= 0.10A. Does this mean it is more or less likely to be safe o...

Havinit

Like the OP I was looking for a case with a fan for a Pi4b. While searching Amazon I noticed that a couple of cases specifically stated that the fan would work with EITHER 3.3 or 5V. As luck would have it the GeekPi case I purchased did not specifically state that it could be used with either volta...

Havinit

Actually, a brushless DC motor isn't primarily an inductor, in that it has electronics built-in to provide the commutation that brushes would be needed for. And, anyway, even a simple brushed motor acts as a generator when the power is removed, generating a voltage in the same direction as the powe...

Havinit

(EDIT: this was @goodburner, I x-posted with Burngate) This is going rapidly into hair-raising territory! Granted the case was a cheap, third-party item but there are many like it that seem to work in the same manner and I guess they have been around since at least the advent of the Pi3. The fan com...

Havinit

Well that is a new development. So the case I bought is not fit for purpose? Can you explain further?

Havinit

Hi, I know there have been other threads on this but I did not find the question(s) I'm about to ask unambiguously answered in any that I read. I bought a case for my Pi4 which includes a "Pi-Fan DC Brushless Fan Model GF3007BS", DC5V =-=-= 0.1A Connected as intended to DC5V pin and GND, it is a bit...

Havinit

@SA7SKY, when you say you did the whole process, do you mean prepared a new SD card from a freshly-downloaded tarball?

Have you also updated by running "pacman -Syu" (as root)?

Havinit

Excellent, just updated and all is good. Thanks for the tipoff

Havinit

@cjan: Are you saying that that kernel has the required update? I updated to that last night but it has not changed the situation. This is all there is in dmesg from brcmfmac: [root@raspi ~]# dmesg|grep brcmfmac [ 7.848567] brcmfmac: brcmf_fw_map_chip_to_name: using brcm/brcmfmac43455-sdio.bin for c...

Havinit

Thanks for the replies. @fruitoftheloom: I do realise that only Raspbian is the "anointed" distro, and I'll certainly join and post on archlinuxarm forum in a few days if an update hasn't resolved it by then (which is what I'm anticipating will happen). But I'm already a member here so I thought I'd...

Havinit

Hi, Just got my 3B+ yesterday and have loaded it up with latest Archlinux-ARM tarball. The onboard wifi device is not detected (although the Bluetooth on the same chip is). No sign of a wlan0 in e.g. iw list or rfkill list. I assume this is because the newer kernel+firmware that Raspbian had ready t...

Havinit

Not so much a question but more of a tip for Pi 3 owners that use a case.. I use the Flirc case and with the new non latching Micro SD card reader implemented on the Pi 3 it's almost impossible to get the SD Card back out without taking the case apart or poking at the SD card with a pin and needle ...

Havinit

I see from the pin-mapping that PCM audio is wired up to the BT part of the 43438, so that means audio out to BT headsets is possible :) This is my primary interest in the Bluetooth capability. Software support will be the clincher though: I used to be able to use a USB BT dongle on my laptop to pl...

Havinit

Regarding the RasPi3 Why were we kept in the dark regarding the new model release? Why did the management allow misleading information regarding the development to remain on the FAQ? 7. WHEN WILL THE NEXT MODEL OF THE RASPBERRY PI BE RELEASED? As of February 2015, the second generation of the Raspb...

Havinit

I see from the pin-mapping that PCM audio is wired up to the BT part of the 43438, so that means audio out to BT headsets is possible :) This is my primary interest in the Bluetooth capability. Software support will be the clincher though: I used to be able to use a USB BT dongle on my laptop to pl...

Havinit

Hi Richard, I'm afraid I never got to a 100% working build. The crux was trying to get the Xorg module built, which involves importing the X server sources and standing on one leg holding a rubber chicken etc. My solution, therefore, has been to use Arch. So I'm stuck with systemd, but at least I'm ...

Havinit

Heh, um, glad to have inspired some good honest nerd cravings I guess ;) For my part, I now boast 5x PN2222^lambdawhatevereleventyone trannies and the second cheapest multimeter on Amazon (blatantly recycled sleeve - lots of oil spots!). I'm waiting on another slow boat from China for my 1120 -pack ...

Havinit

I swear this project is cursed! Maplins were closed when I got there (after walking halfway across town), and in the process I caught a cold so no more gallivanting for a few days. In the meantime, more questions! (Yay!) What would make a given transistor unsuitable/ineffective? I don't really get h...

Havinit

OK, I think it's starting to make sense to me now. (Should I be worried? :lol: ) I'm just going to try and jot down the circuits and bits needed for both projects, so I stop confusing the two. Project #1 (3v3 direct connection): Circuit: TxD pin (3.3V) -> 20Ω -> (+)LED(-) -> 0V Parts: 20Ω resistor P...

Havinit

Incidentally, I am not totally convinced that your LED won't work when directly connected to the GPIO (with a small current-limiting resistor). Anyone else want to comment? The most likely problem is that there won't be enough voltage to light a blue LED, but that won't damage the Pi. What is the h...

Havinit

OK, I hoped I'd get further than this, but it seems my first question has to be: are there other names for a buffer transistor?

I ask because the top result for "buffer transistor" is, um, this thread

(and I've yet to find any further down the list that make an iota of sense to me).

Havinit

At last, the slow boat from China has arrived :D So what we have is a nce clicky little button with about 1mm travel. Physical installation will probably involve making a ~6mm square cutout in the case (and I had to get an aluminium case, didn't I :roll: ) and cementing the body of the switch on beh...

Havinit

Miguel Salinas wrote:It appears the repository has moved or changed name. It would be awesome if you would have this back up!

Worked OK for me, about a week ago (bit slow to post this, sorry).

Thanks for this, I'm trying to get TigerVNC built on wheezy for Pi2 and this is a big part of that challenge taken care of

Havinit

Looks like this repo is dead :( I'd really like to get tigervnc working on wheezy (upgrading to Jessie will bring systemd, which I don't want) so I'm going to try to build it myself. I doubt I will get as far as properly packaging it let alone setting up a repo, but I'll document the builds here as ...

Search found 52 matches

Re: Pi4B: 5V brushless fan on 3V3 pin?

Re: Pi4B: 5V brushless fan on 3V3 pin?

Re: Pi4B: 5V brushless fan on 3V3 pin?

Re: Pi4B: 5V brushless fan on 3V3 pin?

Re: Pi4B: 5V brushless fan on 3V3 pin?

Re: Pi4B: 5V brushless fan on 3V3 pin?

[SOLVED]Pi4B: 5V brushless fan on 3V3 pin?

Re: [solved]RPi 3B+ Wifi

Re: RPi 3B+ Wifi

Re: RPi 3B+ Wifi

Re: RPi 3B+ Wifi

[solved]RPi 3B+ Wifi

Re: The Raspberry Pi 3 Model B Q&A thread

Re: The Raspberry Pi 3 Model B Q&A thread

Re: The Raspberry Pi 3 Model B Q&A thread

Re: The Raspberry Pi 3 Model B Q&A thread

Re: TigerVNC for Raspbian 7 (wheezy)

Re: Illuminated momentary switches

Re: Illuminated momentary switches

Re: Illuminated momentary switches

Re: Illuminated momentary switches

Re: Illuminated momentary switches

Re: Illuminated momentary switches

Re: libjpeg-turbo svn with jpeg8 for raspbian.

Re: TigerVNC for Raspbian 7 (wheezy)