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by drgeoff
Fri Jul 19, 2019 12:51 pm
Forum: HATs and other add-ons
Topic: PiTFT power pins?
Replies: 1
Views: 25

Re: PiTFT power pins?

Both pin 2 and pin 4 on the RPI GPIO are 5 volts and are connected directly together by the PCB. As such any device will be able to take power from those pins or will have no connection to either or both. That means you can try using either on the PiTFT. Probably both will work but if only one does,...
by drgeoff
Fri Jul 19, 2019 12:12 pm
Forum: Beginners
Topic: (HELP ME) Broken IO pin
Replies: 4
Views: 57

Re: (HELP ME) Broken IO pin

Pin 4 is directly connected to pin 2. If the board is still working you can use pin 4 for any purpose that needed pin 2.
by drgeoff
Fri Jul 19, 2019 7:37 am
Forum: Beginners
Topic: Do I need a series resistor using gpio pins for inputs?
Replies: 3
Views: 76

Re: Do I need a series resistor using gpio pins for inputs?

foul_owl wrote:
Thu Jul 18, 2019 11:24 pm
would prefer to not have any resistors hanging directly off one side of the switch, it's a bit annoying and a design weakness imo.
It is not a design weakness. If series resistors were designed in, the current available from GPIOs when used as outputs would be markedly less.
by drgeoff
Thu Jul 18, 2019 2:39 pm
Forum: General discussion
Topic: 32bits Linux OS on Raspberry Pi 3 B+
Replies: 9
Views: 254

Re: 32bits Linux OS on Raspberry Pi 3 B+

asterdeve wrote:
Thu Jul 18, 2019 2:29 pm
Yes exactly I want to run i386 32 bit software on it, How can I run i386 32 bit software on it can you tell me or is there any easy way to do that?
If you have customised the apps perhaps you have source code. If so, recompile to work on RPis.
by drgeoff
Thu Jul 18, 2019 8:32 am
Forum: General discussion
Topic: Pi4b cooling fan wirerd to TP No??
Replies: 12
Views: 359

Re: Pi4b cooling fan wirerd to TP No??

Perusal of https://www.raspberrypi.org/documentation/hardware/raspberrypi/schematics/rpi_SCH_4b_4p0_reduced.pdf will reveal to you that TP1 and the 5 volt pins of the GPIO header are electrically equivalent. Ditto for TP7 and ground pins of the GPIO header. There is no polyfuse, perfect diode or an...
by drgeoff
Wed Jul 17, 2019 11:01 pm
Forum: General discussion
Topic: Pi4b cooling fan wirerd to TP No??
Replies: 12
Views: 359

Re: Pi4b cooling fan wirerd to TP No??

my usual advice is to tap the fan's power to the incoming 5v line (prior to RPi4B's internal protection circuity, so that will be TP1 for +5v and TP7 for the GND), and not from the GPIO header 5v line. @LTolledo Perusal of https://www.raspberrypi.org/documentation/hardware/raspberrypi/schematics/rp...
by drgeoff
Wed Jul 17, 2019 9:40 pm
Forum: Advanced users
Topic: RJ45 connector replacement
Replies: 5
Views: 180

Re: RJ45 connector replacement

amukun wrote:
Wed Jul 17, 2019 9:21 pm
Isn't this just soldered on the board?
Also, should I use parts A70-112-331-N126?
Thank you
From those two questions I conclude that the probability of you successfully replacing the socket is vanishingly small. :(
by drgeoff
Wed Jul 17, 2019 9:18 pm
Forum: General discussion
Topic: Pi4b cooling fan wirerd to TP No??
Replies: 12
Views: 359

Re: Pi4b cooling fan wirerd to TP No??

Modern small fans used to cool PC chips are almost always brushless. They have active circuitry switching current on and off in stationary coils. Whatever protection incorporated for that circuitry is more than adequate to also protect an external power rail.
by drgeoff
Wed Jul 17, 2019 7:14 pm
Forum: General discussion
Topic: Pi4b cooling fan wirerd to TP No??
Replies: 12
Views: 359

Re: Pi4b cooling fan wirerd to TP No??

... I very much doubt it's rated to provide power for a fan. Fan is rated at 5v 0.2A so at 3.3v something like 0.13A Is that to much? I would not assume that Ohm's Law is applicable to the fan. I do not know how much current is too much to take from the 3.3 volt rail. I prefer that you, rather than...
by drgeoff
Wed Jul 17, 2019 7:02 pm
Forum: Advanced users
Topic: RJ45 connector replacement
Replies: 5
Views: 180

Re: RJ45 connector replacement

Removing a multi-pin through hole component from a multi-layer board is not a simple procedure. If you are truly convinced it must be replaced I recommend dismembering the socket in place to the state where individual pins can be desoldered and removed. You may find a Dremel type tool helpful in the...
by drgeoff
Wed Jul 17, 2019 6:52 pm
Forum: General discussion
Topic: Pi4b cooling fan wirerd to TP No??
Replies: 12
Views: 359

Re: Pi4b cooling fan wirerd to TP No??

I would recommend you do not to connect your fan to the 3.3v on your pi , I very much doubt it's rated to provide power for a fan. +1 Use 5 volt and ground points, eg the underside of those pins on the GPIO header. If you then want to reduce fan speed/noise, experiment with various values of a seri...
by drgeoff
Wed Jul 17, 2019 6:03 pm
Forum: Networking and servers
Topic: Which WiFi hub am I connecting to?
Replies: 4
Views: 129

Re: Which WiFi hub am I connecting to?

By the way - for local addresses you do not need to hide the IP - can make debugging much much harder for folk helping. Routers will not allow access to them from outside the LAN The router will never be troubled by external traffic to those addresses. It won't even reach the router as those addres...
by drgeoff
Wed Jul 17, 2019 5:47 pm
Forum: Beginners
Topic: Destination Host Unreachable
Replies: 16
Views: 206

Re: Destination Host Unreachable

GorilaCabreado wrote:
Wed Jul 17, 2019 5:09 pm

Code: Select all

static ip_address= 192.168.1.39/24
static routers=192.168.1
static domain_name_servers=192.168.1
All 3 of those lines should contain a dotted quad. Only one does.
by drgeoff
Wed Jul 17, 2019 3:18 pm
Forum: Troubleshooting
Topic: Is there a Pi 4 Undervoltage warning?
Replies: 5
Views: 270

Re: Is there a Pi 4 Undervoltage warning?

Yes the RPi4B has an undervoltage detector and it triggers the same lightning bolt seen with previous models.
by drgeoff
Wed Jul 17, 2019 7:27 am
Forum: Troubleshooting
Topic: If you have a Raspberry Pi 4 and are getting bad speeds transferring data to/from USB3.0 SSDs, read this
Replies: 5
Views: 844

Re: If you have a Raspberry Pi 4 and are getting bad speeds transferring data to/from USB3.0 SSDs, read this

Maybe the "At the start of the line of parameters," in step 2 could be more explicit about what that line looks like.
by drgeoff
Tue Jul 16, 2019 11:54 am
Forum: Graphics, sound and multimedia
Topic: Raspberry As Audio Output Device
Replies: 23
Views: 705

Re: Raspberry As Audio Output Device

What about separating audio channels like Right Sound - Left Sound - SubWoofer, That simple Jack socket will handle this ? No, the AV analogue jack (3.5mm TRRS) can only output 2 audio channels. Your Pioneer amp is specifically designed to take a normal analogue stereo input and separate the low fr...
by drgeoff
Tue Jul 16, 2019 11:35 am
Forum: General discussion
Topic: I didn't think the usb c power thing was a big deal...
Replies: 92
Views: 3979

Re: I didn't think the usb c power thing was a big deal...

incognitum wrote:
Tue Jul 16, 2019 11:02 am
davidcoton wrote:
Tue Jul 16, 2019 8:23 am
E.g. kid that bought his own Pi, but planned to borrow the charger of dad's (or mom's) Macbook.
And that Macbook may actually not even be owned by the parent, but provided by their employer.
In which case the kid should not be using the Macbook PSU. The employer has not provided it for such use.
by drgeoff
Mon Jul 15, 2019 11:07 pm
Forum: Graphics, sound and multimedia
Topic: Raspberry As Audio Output Device
Replies: 23
Views: 705

Re: Raspberry As Audio Output Device

The Raspberry Pi can output audio easily over 3.5mm line-level jack and HDMI. If you want audiophile quality though, you should avoid the default analog output. ghans What about separating audio channels like Right Sound - Left Sound - SubWoofer, That simple Jack socket will handle this ? No, the A...
by drgeoff
Mon Jul 15, 2019 6:06 pm
Forum: Advanced users
Topic: usb and direct power
Replies: 2
Views: 157

Re: usb and direct power

I have a raspberry pi 4. I'd like to use the usb-c connector to do usb gadgets. I'd also like to power the board directly. In this configuration though, power could be obtained from the usb-c port at the same time as the direct power feed, potentially causing problems. Is there a way to ensure powe...
by drgeoff
Mon Jul 15, 2019 9:29 am
Forum: Troubleshooting
Topic: SSH over USB with Raspberry Pi 3B?
Replies: 5
Views: 3532

Re: SSH over USB with Raspberry Pi 3B?

Hi, Shall You share the steps required for communicating Raspberry Pi 3 B+ with an Ubuntu Laptop, through SSH, with USBNET cable? I think USBNET cable need to be connected to one of the USB Host ports of Raspberry Pi 3 B+(not in USB slave port). Right? Neither RPi3B nor RPi3B+ has a USB slave port....
by drgeoff
Mon Jul 15, 2019 9:13 am
Forum: General discussion
Topic: I didn't think the usb c power thing was a big deal...
Replies: 92
Views: 3979

Re: I didn't think the usb c power thing was a big deal...

Being a noob to the Pi Ecosystem and new to the forum, I have an HDMI Audio passthrough question waiting in a queue well, because I am new, so I may as well ask this here - when the fixed boards are put out in the wild, will the fix interfere w/ the current mounting options of the Pi4? Reason I ask...
by drgeoff
Sat Jul 13, 2019 2:36 pm
Forum: Troubleshooting
Topic: No internet on Pi hotspot.
Replies: 4
Views: 121

Re: No internet on Pi hotspot.

That is not an error. It is a warning.

What is the actual problem when you get to the end of the instructions and try to use it?
by drgeoff
Sat Jul 13, 2019 12:23 pm
Forum: General discussion
Topic: RPi4 chargers
Replies: 19
Views: 828

Re: RPi4 chargers

however, if you have an RPi3B+ (or even an RPi3B) and powering it via a known good power supply (not some charger)... you may be able to use that to power the RPi4B using a microUSB to USB type-c adapter in the mean time... That method is "endorsed" by RPT/RPF themselves. https://www.raspberrypi.or...

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