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by Paul Hutch
Sun Jul 05, 2020 2:04 pm
Forum: Advanced users
Topic: Can Pi 4 be powered through GPIO pins?
Replies: 19
Views: 21560

Re: Can Pi 4 be powered through GPIO pins?

OK, and now about 5V at pin 2/4: - Why should it be neccessary to have 5V at pin 2 AND pin 4? - I tried only one pin (2 or 4) in the past with mixed success. What ist the truth? 2 AND 4 or 2 OR 4? From the Raspberry Pi folks https://github.com/raspberrypi/hats/blob/master/designguide.md#back-poweri...
by Paul Hutch
Wed Jul 01, 2020 3:14 pm
Forum: Advanced users
Topic: Connecting a USB serial printer does not result in a TTY device in /dev
Replies: 2
Views: 186

Re: Connecting a USB serial printer does not result in a TTY device in /dev

When I don't get a /dev/ttyUSBxx or a /dev/ttyyACMxx device showing up I follow these steps. Disconnect the USB-Serial adapter Disconnect the printer from the USB-Serial adapter Wait about 30 seconds Run lsusb and ls /dev/tty* to see the normal lists Plug in only the USB-Serial adapter (without the ...
by Paul Hutch
Thu Jun 25, 2020 7:46 pm
Forum: General discussion
Topic: Raspberry Pi3 B Low Power ( I use it for 3 years )
Replies: 25
Views: 967

Re: Raspberry Pi3 B Low Power ( I use it for 3 years )

I put mine power supply and my SDCARD in Raspberry that's belongs to my friend and DONT SHOW lightning icon. I use the same Outlet/Socket for both Test. I put the SDCARD and powersupply of my Friend in my Raspberry and shows lightning icon. Assuming the only difference between the two tests is the ...
by Paul Hutch
Wed Jun 24, 2020 11:32 am
Forum: Python
Topic: sudo python3 No module named 'cv2'
Replies: 9
Views: 539

Re: sudo python3 No module named 'cv2'

i did but i always got the same problem. it seems that it installed on /usr/local/lib/ python3.5 not on /home/pi/.local/lib/ python3.7 / I suspect a large part of the problem is caused by having two versions of Python 3 installed. I have no idea how to properly have two versions of Python3 installe...
by Paul Hutch
Tue Jun 23, 2020 11:30 am
Forum: General discussion
Topic: What's the minimum Amp to boot a Raspberry
Replies: 10
Views: 712

Re: What's the minimum A to boot a Raspberry

All my tests over the years has shown that the official power supply requirements documentation is correct.
by Paul Hutch
Mon Jun 22, 2020 12:05 pm
Forum: General discussion
Topic: SD card: Do I have a bad unit/hardware flaw?
Replies: 6
Views: 323

Re: SD card: Do I have a bad unit/hardware flaw?

Are the other cards all the same make/model and purchased from the same seller? The OP wrote "The card sizes were 32,64,128gb sizes" so cannot all have been the same model. I have used a wide variety of makes/models/sizes As you can see in my first paragraph I consider card size to be a third varia...
by Paul Hutch
Sun Jun 21, 2020 12:15 pm
Forum: General discussion
Topic: SD card: Do I have a bad unit/hardware flaw?
Replies: 6
Views: 323

Re: SD card: Do I have a bad unit/hardware flaw?

In my experience Raspberry Pi's are not at all picky about the uSD card they use. I have used a wide variety of makes/models/sizes and have never had a Raspberry Pi not work with any of them. Since the Raspberry Pi works with the uSD card that came with it, I think the most likely cause of the probl...
by Paul Hutch
Wed Jun 17, 2020 1:57 pm
Forum: General discussion
Topic: I want to use extra UARTs from the GPIO on the Raspberry Pi 4.
Replies: 2
Views: 178

Re: I want to use extra UARTs from the GPIO on the Raspberry Pi 4.

Check out his forum post Pi-4 Activating additional UART ports https://www.raspberrypi.org/forums/viewtopic.php?f=107&t=244827 I don't own a Pi4 so I didn't read the whole thread but hopefully it has enough information for you to get it going. BTW it was not easy finding that starting from the UART ...
by Paul Hutch
Tue Jun 16, 2020 2:12 am
Forum: Python
Topic: How to install Python 3
Replies: 9
Views: 802

Re: How to install Python 3

The official recommendation from the Python Software Foundation is to use: python -m pip install SomePackage https://docs.python.org/3/installing/index.html The recommendation is for a common situation on other platforms that don't apply to most RasPi users. When you have multiple versions of Python...
by Paul Hutch
Tue Jun 16, 2020 1:26 am
Forum: Advanced users
Topic: RPi Zero doesn't have enough processing power to send RF signals
Replies: 18
Views: 834

Re: RPi Zero doesn't have enough processing power to send RF signals

Thanks for pointing to the library. Looking at the source to figure out the values I saw that this is a bit-banged interface so I stopped. That is exactly the kind of interfacing that will suffer from even tiny processing interruptions. So that points to the single vs quad core difference as the cau...
by Paul Hutch
Mon Jun 15, 2020 8:33 pm
Forum: Advanced users
Topic: RPi Zero doesn't have enough processing power to send RF signals
Replies: 18
Views: 834

Re: RPi Zero doesn't have enough processing power to send RF signals

It seems unlikely that the processor speed difference would be an issue for a normal 433 MHz system. The quad vs single core is the major performance impact when dropping down to a Pi Zero , the clock speed difference is only 20%. In addition to the details that dickon is asking for, What's the: dat...
by Paul Hutch
Mon Jun 15, 2020 3:23 pm
Forum: Advanced users
Topic: Raspberry Pi 4B struggles “waking up” after running all night
Replies: 6
Views: 493

Re: Raspberry Pi 4B struggles “waking up” after running all night

I'd start by examining /var/log/syslog for the time when the problem occurs. If no problems are shown then I'd add some type of error and event logging to the custom code. Most of my Pi code is Python and with that language I use its logging library to do this but there is quite a learning curve to ...
by Paul Hutch
Fri Jun 12, 2020 9:19 pm
Forum: Advanced users
Topic: RS232 to USB on RasPi
Replies: 2
Views: 252

Re: RS232 to USB on RasPi

An awful lot depends on the capabilities of the "device that we can then use to "reach-through" via serial ports".

Setting up a serial login console on a Pi is not too hard.
Some good info here: https://elinux.org/RPi_Serial_Connection
by Paul Hutch
Thu Jun 11, 2020 9:22 pm
Forum: General discussion
Topic: How to configure pi4 so that a LAN works on the lan port and the Internet is taken from a WIFI connection?
Replies: 4
Views: 363

Re: How to configure pi4 so that a LAN works on the lan port and the Internet is taken from a WIFI connection?

This sounds like a situation I hit recently. LAN router had no internet connection WAN router did have an internet connection Running "ip route" showed that there was a default gateway set for both the LAN & WAN connections. The best solution was to make the LAN router not provide a default gateway ...
by Paul Hutch
Thu Jun 11, 2020 11:38 am
Forum: General discussion
Topic: Will PI still detect under voltage lockout during shutdown? Can PI have graceful shutdown during Under voltage lockout?
Replies: 5
Views: 432

Re: Will PI still detect under voltage lockout during shutdown? Can PI have graceful shutdown during Under voltage locko

So, while discharging through the supercapacitor the raspberry pi SDcard won't crash as they mentioned the PI has errotic behavior in under voltage lockout condition.? The Pi may crash and corrupt the uSd card because it won't halt the CPU or shut off the power when the input voltage drops too low....
by Paul Hutch
Wed Jun 10, 2020 4:29 pm
Forum: General discussion
Topic: WIFI 8 channel K-Type Temperature Logger
Replies: 2
Views: 135

Re: WIFI 8 channel K-Type Temperature Logger

If you need industrial grade measurements, there's a nice RasPi thermocouple interface system from a very good industrial supplier, Measurement Computing Corporation. However it will cost 300 USD for 8 channels. https://www.mccdaq.com/DAQ-HAT/MCC-134.aspx
by Paul Hutch
Wed Jun 10, 2020 1:35 pm
Forum: Advanced users
Topic: Raspberry Pi Zero W Operating Temperature Range
Replies: 1
Views: 207

Re: Raspberry Pi Zero W Operating Temperature Range

I seem to recall that a while back somebody official said on the forum that the Zero & Zero W range has the same spec as the other Pi's. So as the Pi3B+ data sheet says it's 0 to 50 °C, the standard range for indoor consumer products. Of course these are design specifications so many, probably nearl...
by Paul Hutch
Mon Jun 08, 2020 1:11 pm
Forum: General discussion
Topic: USB drive does not stay mounted..
Replies: 15
Views: 625

Re: USB drive does not keep mounted..

I was using FileZilla but could not find the images - now I can! The next thing is to automate the transfer - any ideas?? Many thanks.. Also if the images remain on the SD card how do I get permission to delete them? Haven't tried to automate this for my bird nest camera, thinking about it my first...
by Paul Hutch
Sun Jun 07, 2020 10:38 pm
Forum: General discussion
Topic: USB drive does not stay mounted..
Replies: 15
Views: 625

Re: USB drive does not keep mounted..

I was toying with the idea of using ftp to connect to the raspberry and that looks like it would work. Just drag the pics from the raspberry sd card (well that was the idea) but I do not know where to images are stored on the SD card to able them to be dragged over. I am using WinScp. Any ideas? Ot...
by Paul Hutch
Thu Jun 04, 2020 12:55 pm
Forum: General discussion
Topic: Will PI still detect under voltage lockout during shutdown? Can PI have graceful shutdown during Under voltage lockout?
Replies: 5
Views: 432

Re: Will PI still detect under voltage lockout during shutdown? Can PI have graceful shutdown during Under voltage locko

AIUI, the lockout function only happens during power up, it prevents startup if the voltage is too low. Once powered up, a low voltage condition will only trigger the warning icon, it does not shut off the power or halt the CPU.
by Paul Hutch
Mon Jun 01, 2020 2:16 pm
Forum: General discussion
Topic: RPi Rack Mount Case Project
Replies: 15
Views: 1006

Re: RPi Rack Mount Case Project

That looks like a nice voltage regulator. Those pins seem a bit inconvenient for a maker-style solder-it-yourself project. How do you wire them up? They have 1.7 mm pin spacing (0.067", 2/3rd standard DIP) so definitely not easy to use for some people. When I'm not using a PCB/breadboard with custo...
by Paul Hutch
Sat May 30, 2020 1:11 pm
Forum: General discussion
Topic: RPi Rack Mount Case Project
Replies: 15
Views: 1006

Re: RPi Rack Mount Case Project

Do you think it would be possible to run a Pi 4B using one these 5V buck converters Based on a quick look, the specs look OK so they may work fine. However since there is no manufacturer name I'd worry that the performance won't match the specs and/or the lifetime will be short (been burned too man...
by Paul Hutch
Sat May 30, 2020 1:03 pm
Forum: General discussion
Topic: RPi Rack Mount Case Project
Replies: 15
Views: 1006

Re: RPi Rack Mount Case Project

Thanks Paul! I was kind of hoping people would ask some questions about it. I started to type some questions and then remembered that last week when people, including me, started making comments and asking questions about a posted project the user got upset and went away without addressing most of ...
by Paul Hutch
Thu May 28, 2020 7:33 pm
Forum: General discussion
Topic: Raspbian Buster on Pi 3B+?
Replies: 3
Views: 252

Re: Raspbian Buster on Pi 3B+?

My oldest Pi3B (not +) desktop install was acting wonky a few weeks ago so I decided it was time to reinstall from scratch to clean up years of updates and trying out programs. I chose Buster Desktop and so far it appears to perform as well as Stretch desktop did.

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