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by Paul Hutch
Sun Mar 29, 2020 12:54 pm
Forum: Advanced users
Topic: What is the max micro sd card for Rasberry Pi 4 B / 4GB? can use a 64GB micro sd card like below? upper?
Replies: 16
Views: 760

Re: What is the max micro sd card for Rasberry Pi 4 B / 4GB? can use a 64GB micro sd card like below? upper?

Rukbat wrote:
Sat Mar 28, 2020 4:47 pm
Think about it. As Paul Hutch reminded me, the bootloader ...
To clarify, It was jahboater who reminded you not me.
by Paul Hutch
Fri Mar 27, 2020 1:49 pm
Forum: General discussion
Topic: Old SD (or microSD) cards
Replies: 14
Views: 428

Re: Old SD (or microSD) cards

Use them for archiving data like pictures. They should be able to hold the data at least 20 years. You'd have to be very methodical with records and storage. Geffers To make it easier to track and catalog the contents be sure to give each card a unique volume label and then use Virtual Volumes View...
by Paul Hutch
Thu Mar 26, 2020 10:01 pm
Forum: Off topic discussion
Topic: Call for help: looking to start a company - solar powered computer
Replies: 31
Views: 977

Re: Call for help: looking to start a company - solar powered computer

A solar powered calculator is orders of magnitude lower in power consumption than even the lowest power microcontroller, let alone a microprocessor. They are usually built around custom chips designed to do only a solar powered calculator function. IIRC, a typical solar powered calculator chipset op...
by Paul Hutch
Thu Mar 26, 2020 12:45 pm
Forum: Advanced users
Topic: What is the max micro sd card for Rasberry Pi 4 B / 4GB? can use a 64GB micro sd card like below? upper?
Replies: 16
Views: 760

Re: What is the max micro sd card for Rasberry Pi 4 B / 4GB? can use a 64GB micro sd card like below? upper?

Rukbat wrote:
Thu Mar 26, 2020 4:37 am
Formatted as FAT32, or as exFAT? (Just asking - you'd know, so you can save me time forcing the card to format as FAT32, or leaving it as exFAT and having it not work.)
Formatting is irrelevant because when the disk image is copied onto the card it wipes out all existing formatting.
by Paul Hutch
Tue Mar 24, 2020 11:26 pm
Forum: Advanced users
Topic: What is the max micro sd card for Rasberry Pi 4 B / 4GB? can use a 64GB micro sd card like below? upper?
Replies: 16
Views: 760

Re: What is the max micro sd card for Rasberry Pi 4 B / 4GB? can use a 64GB micro sd card like below? upper?

I tried a SanDisk Ultra A1 400GB uSD card in aPi3B+ running Stretch Lite this past week and it appears to work fine (I bought the card for a different use but figured it would be fun to try it out).
by Paul Hutch
Wed Mar 11, 2020 7:42 pm
Forum: Advanced users
Topic: Pi wifi re/connection
Replies: 6
Views: 299

Re: Pi wifi re/connection

Many thanks for the reply Paul .. I was looking round in /proc to see if I could find a reference to the WAP being connected to ( and didnt find anything ) WiFi up/down status is recorded in syslog, most simple dropouts and connects are found by searching for messages that mention carrier in relati...
by Paul Hutch
Wed Mar 11, 2020 2:05 pm
Forum: General discussion
Topic: Rpi zero charger
Replies: 5
Views: 344

Re: Rpi zero charger

The official FAQ Power section has a lot of good information. https://www.raspberrypi.org/documentati ... /#pi-power
by Paul Hutch
Wed Mar 11, 2020 1:57 pm
Forum: Advanced users
Topic: Pi wifi re/connection
Replies: 6
Views: 299

Re: Pi wifi re/connection

After two years of extensively testing the resiliency of WiFi connections for a work project I can authoritatively state that the answer to 1 & 2 is: They are supposed to, and they usually do succeed, but they don't always succeed, so a definite maybe. :D This is from testing a dozen Pi's, various W...
by Paul Hutch
Tue Mar 10, 2020 12:59 pm
Forum: General discussion
Topic: Can I use Amazon's Power Adapter?
Replies: 15
Views: 657

Re: Can I use Amazon's Power Adapter?

Check the ratings printed on the particular unit you want to use. If the current rating is < 1.5A I wouldn't bother trying it. Of course how much current you'll need also depends on what USB devices and accessory HATs will be attached and how hard you'll push the Pi. I have an Amazon branded unit th...
by Paul Hutch
Mon Mar 09, 2020 10:01 pm
Forum: Advanced users
Topic: Raspberry Pi and Powerbank
Replies: 16
Views: 835

Re: Raspberry Pi and Powerbank

Then I guess my Pi is faulty. I just did the measurements again to verify. When supplied with 4.96V on the USB-C-input, the thunderbolt appears: piundervoltage.jpg I previously had a similar observation with a fixed regulator which measured 4.99V. I can turn the voltage down all the way to at least...
by Paul Hutch
Mon Mar 09, 2020 3:41 pm
Forum: Advanced users
Topic: Raspberry Pi and Powerbank
Replies: 16
Views: 835

Re: Raspberry Pi and Powerbank

I experimented previously with a Pi4B, put ~5V adjustable power supply to the +5V rail directly. The "under voltage" message still appears with 5.00V (according to my voltage meter), turning it up a bit to 5.05V or so removes the message. Not sure where the 4.65V fits in. IIRC (it's been a long whi...
by Paul Hutch
Sat Mar 07, 2020 1:15 pm
Forum: Advanced users
Topic: Simultaneous WiFi connections
Replies: 5
Views: 421

Re: Simultaneous WiFi connections

Make sure the two networks use different private IP address a ranges. e.g. 192.168.1.X/255.255.255.0 and 192.168.2.X/255.255.255.0
by Paul Hutch
Sat Mar 07, 2020 1:13 pm
Forum: Advanced users
Topic: Image File Utilities
Replies: 165
Views: 15679

Re: Image File Utilities

dsyleixa123 wrote:
Sat Mar 07, 2020 12:38 pm
where are my former posts?
Click the Search user’s posts link at your user profile page (click on your user name to open the profile).
by Paul Hutch
Sat Mar 07, 2020 1:07 pm
Forum: General discussion
Topic: A portable wifi nas
Replies: 4
Views: 346

Re: A portable wifi nas

Check out B&H's article for an excellent round up of off the shelf solutions. https://www.bhphotovideo.com/explora/photography/buying-guide/guide-to-portable-hard-drives-for-the-travel-photographer This is one of those cases where rolling your own may be more cost effective depending on your skill l...
by Paul Hutch
Sat Mar 07, 2020 12:47 pm
Forum: General discussion
Topic: SD Card Memory
Replies: 3
Views: 215

Re: SD Card Memory

It seems that your chosen OS distro is lacking the automatic file system expansion on first boot feature (Raspbian would expand to use the whole 128G during the first boot). You can manually do the file system expansion on the Pi from the command line. sudo raspi-config Choose: 7 Advanced Options A1...
by Paul Hutch
Sat Mar 07, 2020 12:21 pm
Forum: Advanced users
Topic: What is the best way to create compressed disk image?
Replies: 19
Views: 741

Re: What is the best way to create compressed disk image?

Yes you could just use the same Pi with a second card setup for the image copy process. If you used an extra large second card you can even skip the external USB storage for storing the large disk images.
by Paul Hutch
Fri Mar 06, 2020 9:44 pm
Forum: Advanced users
Topic: What is the best way to create compressed disk image?
Replies: 19
Views: 741

Re: What is the best way to create compressed disk image?

I plagiarized your list as a starting point :-) - Use 8GB SD card, install all required software on that card on Pi - Remove card from Pi and insert it into my desktop Pi's card reader - Use dd to create an ‘img’ file on the USB storage (HDD or thumb drive depending on which extra Pi I'm using) - Ru...
by Paul Hutch
Fri Mar 06, 2020 9:03 pm
Forum: Advanced users
Topic: What is the best way to create compressed disk image?
Replies: 19
Views: 741

Re: What is the best way to create compressed disk image?

I use basically the same process as you listed except I avoid moving the files and cards around by doing it all on a spare Pi running desktop Raspbian.

The spare Pi has a uSD card reader and extra USB storage for the files, and I use dd to do the read/write and 7Zip for the final compression.
by Paul Hutch
Fri Mar 06, 2020 8:53 pm
Forum: Advanced users
Topic: Image File Utilities
Replies: 165
Views: 15679

Re: Image File Utilities

how will pishrink know to which size the img file (created by Win32DiskImager) has to be shrunk? (e.g. from 29.8 -> 29.7 GB or 29.8 ->16GB or 15.8 GB ?) It always does a maximum shrink to the smallest size. It also sets up the image so that after it is written to a new card it automatically expands...
by Paul Hutch
Fri Mar 06, 2020 6:12 pm
Forum: Advanced users
Topic: Image File Utilities
Replies: 165
Views: 15679

Re: Image File Utilities

You might find PiShrink easier to understand. Basically you don't need to use any options just:

Code: Select all

sudo pishrink.sh pi.img
https://github.com/Drewsif/PiShrink
by Paul Hutch
Fri Mar 06, 2020 11:05 am
Forum: General discussion
Topic: Illegal use of the Raspberry Pi for profit
Replies: 30
Views: 1733

Re: Illegal use of the Raspberry Pi for profit

Based on my 30 year experience as a copyrighted content creator for my employer and myself, and the advice given to me by our corporate IP lawyers, W. H. Heydt is 100% correct. Ideas are covered by patents, something else I have obtained for my employer, not copyright. While it misses a lot of detai...
by Paul Hutch
Tue Feb 11, 2020 7:41 pm
Forum: General discussion
Topic: Heat torture testing Pi4
Replies: 37
Views: 1610

Re: Heat torture testing Pi4

That because we throttle the CPU when it get to 85 to keep the temperatures down. I've never seen anything over 90 in normal usage, so no idea how you are getting your CPU temperature so high - I suspect it should have shut down. Is this an actual shut down or just throttling that you are referring...
by Paul Hutch
Tue Feb 11, 2020 1:54 pm
Forum: Python
Topic: Make Learning Python Easy ?
Replies: 12
Views: 2801

Re: Make Learning Python Easy ?

I'll take a close look at the Raspberry Pi foundation's Python Intro for sure.. & thank you everyone for all your collective inputs. From what I've seen I'll learn version 2.x first and then maybe move on to 3.x. ... That's similar to deciding to learn old english before learning modern english. :P...
by Paul Hutch
Sat Feb 08, 2020 12:29 am
Forum: Advanced users
Topic: use SD Card Copier in batch mode
Replies: 8
Views: 913

Re: use SD Card Copier in batch mode

dandan21 wrote:
Thu Feb 06, 2020 1:58 pm
Thanks, but this refers to unix or mac.
I want to run this from my Pi same as i do (manually) with SD Card Copier
The Pi runs a version of unix, specifically the Raspbian distribution of Linux, and those instructions are from the Raspberry Pi Foundation.

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