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by Paul Hutch
Thu May 28, 2020 7:26 pm
Forum: General discussion
Topic: Wacom cintiq pro 16
Replies: 3
Views: 233

Re: Wacom cintiq pro 16

This may help:
Wacom Cintiq 16 on Debian Stretch https://www.tablix.org/~avian/blog/arch ... n_stretch/
by Paul Hutch
Thu May 28, 2020 7:19 pm
Forum: General discussion
Topic: RPi Rack Mount Case Project
Replies: 15
Views: 1003

Re: RPi Rack Mount Case Project

Very nice!
by Paul Hutch
Thu May 28, 2020 10:01 am
Forum: General discussion
Topic: Solar Power with phone charger
Replies: 21
Views: 951

Re: Solar Power with phone charger

The Amazon page does not give dimensions but based on the photos the solar panel of 20 cells is about the size of a flagship smartphone. One of the photos also claims 17% solar conversion rate.
by Paul Hutch
Wed May 27, 2020 8:36 pm
Forum: General discussion
Topic: Oh, that's the case I want...
Replies: 25
Views: 1401

Re: Oh, that's the case I want...

To avoid cracking and breakouts when drilling acrylic, buy plastic cutting drill bits. Heh, OK, on to the shopping list. I will pop some vent holes in the bottom too - is starting with small pilot holes a good idea, or just increasing the risk with each hole drilled? As long as all the bits in the ...
by Paul Hutch
Wed May 27, 2020 8:21 pm
Forum: General discussion
Topic: Solar Power with phone charger
Replies: 21
Views: 951

Re: Solar Power with phone charger

So far, I've noticed the batteries will be fully charged up after being in the sun for the day, and the pi only draws it down to 75% overnight. If you don't mind, could you say where you're located. It will help those of us in other areas get an idea of how to adjust our expectations versus your re...
by Paul Hutch
Wed May 27, 2020 5:16 pm
Forum: General discussion
Topic: Micro sd to usb adapters
Replies: 12
Views: 667

Re: Micro sd to usb adapters

My two favorites are:
https://www.iogear.com/product/GFR204SD/
https://www.tripplite.com/usb-3.0-super ... ~U352000SD

The side slot feature on these makes getting the card out very easy.
by Paul Hutch
Wed May 27, 2020 5:04 pm
Forum: General discussion
Topic: Oh, that's the case I want...
Replies: 25
Views: 1401

Re: Oh, that's the case I want...

To avoid cracking and breakouts when drilling acrylic, buy plastic cutting drill bits. Regular metal and wood bits have a point angle that causes the chipping, grabbing and cracking when drilling acrylic. I finally bought some a couple years ago and am still kicking myself for not buying some many d...
by Paul Hutch
Wed May 27, 2020 4:18 pm
Forum: General discussion
Topic: Illegal Instruction Error
Replies: 4
Views: 320

Re: Illegal Instruction Error

Things I try first before looking for more unusual problem sources.
  1. Re-write the disk image to the card
  2. Try a different card
  3. Re-write the disk image to the new card
If it still isn't working then I'll start checking other less common problems (IME, bad image writes and bad cards are more common)
by Paul Hutch
Sat May 23, 2020 3:10 pm
Forum: Python
Topic: Delay in writing to text file
Replies: 3
Views: 228

Re: Delay in writing to text file

Change the buffering parameter of the open function. IIRC, the default for normal text files on Raspbian is 4 KiB (4096 bytes), this reduces the frequency of writes which increases performance and reduces uSD card wear. For line buffering use: days_file = open(path, 'a', 1) To specify a specific num...
by Paul Hutch
Sat May 23, 2020 12:48 pm
Forum: General discussion
Topic: Screen extension cable?
Replies: 2
Views: 157

Re: Screen extension cable?

Search for an FFC/FPC extension adapter plus cable. Here's an example of a 50 pin adapter that lets you add another cable. https://www.adafruit.com/product/4522 This is a 50 pin kit with an adapter and a cable. https://www.amazon.com/VSDISPLAY-Connector-Adapter-Extension-Extend/dp/B07RT4XZBN For sig...
by Paul Hutch
Thu May 21, 2020 1:22 am
Forum: General discussion
Topic: Rpi solar power :)
Replies: 17
Views: 990

Re: Rpi solar power :)

OK so there is a solar panel, not sure why you didn't show it, or even mention it, in the OP. So what's the deal with power all you say is: 18650 lasts upto 11Hrs with the Rpi zero You say the battery lasts up to 11 hours, is that with the solar panel in full sun and the battery lasts a shorter time...
by Paul Hutch
Tue May 19, 2020 2:37 pm
Forum: General discussion
Topic: Rpi solar power :)
Replies: 17
Views: 990

Re: Rpi solar power :)

Based on the text and photo posted, there's no solar power involved.

Title should be portable "Rpi power bank : )"
by Paul Hutch
Fri May 15, 2020 11:36 am
Forum: General discussion
Topic: Largest SD card supported by PI hardware?
Replies: 21
Views: 1376

Re: Largest SD card supported by PI hardware?

I tried a SanDisk Ultra A1 400GB uSD card in aPi3B+ running Stretch Lite last month 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
Thu May 14, 2020 2:25 pm
Forum: General discussion
Topic: Pi3 overheating: would Pi4 be cooler?
Replies: 19
Views: 1082

Re: Pi3 overheating: would Pi4 be cooler?

The thing with heat sinks, is they're exactly that - a heat sink, heat will drain into them until they're saturated at which point any further excess heat your Pi generates, will not dissipate any faster than it is generated. Not quite the whole story. They also have vastly greater surface area so ...
by Paul Hutch
Wed May 13, 2020 10:33 pm
Forum: Raspberry Pi Desktop for PC and Mac
Topic: DEBIAN X86 for PC redistribution
Replies: 13
Views: 841

Re: Raspbian for PC redistribution

If your distribution is commercial there is significant extra burden to avoid GPL violations. The following article has details, A Practical Guide to GPL Compliance https://www.softwarefreedom.org/resourc ... guide.html
by Paul Hutch
Tue May 12, 2020 4:17 pm
Forum: General discussion
Topic: Pi3 overheating: would Pi4 be cooler?
Replies: 19
Views: 1082

Re: Pi3 overheating: would Pi4 be cooler?

Of course if you are referring to ambient over 85C then you are correct (but that's almost 30C over the highest ambient temperature ever recorded in nature). Meteorology geek nitpick: that's the highest air temperature (open shade neutral surface ambient). Ambient temperature over a black surface, ...
by Paul Hutch
Fri May 08, 2020 7:28 pm
Forum: General discussion
Topic: Router vs Repeater Problem.
Replies: 25
Views: 759

Re: Router vs Repeater Problem.

So I have a T-Link Repeater installed on external wall, If you mean you have TP-Link consumer grade repeater then you may be able to solve the problem by changing the default setup configuration. The default configuration isolates the two networks for extra security. AIUI, by using the "Copy Host S...
by Paul Hutch
Mon May 04, 2020 4:26 pm
Forum: Python
Topic: tips on embedding rpi
Replies: 7
Views: 540

Re: tips on embedding rpi

I was hoping that a 700MHz 32 bit computer would be as fast as my 16MHz 8bit microcontroller. The speed differences you're seeing are typical when comparing a microcontroller with no general purpose operating system to a microprocessor based computer with all the capabilities of a personal computer...
by Paul Hutch
Mon May 04, 2020 3:19 pm
Forum: General discussion
Topic: USB Hub that powers RPi and other devices.
Replies: 9
Views: 474

Re: USB Hub that powers RPi and other devices.

If you managed to find a 4-port USB 3 with a 5A PSU, after allocating 900mA to each of the other three ports (for a total of 2.7A), you will have 2.3A left over for the Pi. That's enough to meet spec up through a Pi2B, but less than spec for a Pi3B/Pi3B+, let alone a Pi4B. And that assumes said hub...
by Paul Hutch
Wed Apr 29, 2020 12:34 pm
Forum: General discussion
Topic: Fastest way to get an image from the Internet to your SD card? (benchmarks inside)
Replies: 41
Views: 2059

Re: What's the fastest way to flash a SD card? (benchmarks inside)

There are so many variables in this multifaceted process that any simple benchmarking is mostly irrelevant. One example, downloading from the internet often varies significantly from one download to the next. IIRC, RPI Imager downloads as it writes as well, so that doesn't explain why the numbers v...
by Paul Hutch
Tue Apr 28, 2020 1:49 pm
Forum: General discussion
Topic: Fastest way to get an image from the Internet to your SD card? (benchmarks inside)
Replies: 41
Views: 2059

Re: What's the fastest way to flash a SD card? (benchmarks inside)

Just a sidenote, your benchmark must be incorrect, because Pi Power Tools Flash seemingly runs faster than dd alone, however it includes dd, so this simply can't be. If flashing with dd requires 6:50, then it is not possible to download, uncompress AND flash with dd in 6:27. That stuck out like a s...
by Paul Hutch
Mon Apr 27, 2020 9:25 pm
Forum: General discussion
Topic: Phone charger - can I use?
Replies: 5
Views: 242

Re: Phone charger - can I use?

It is labelled "DASH", but that is just the relatively high amperage, I guess? That's a tiny bit more data. From what little information I could find it appears DASH is a special charging system that a OnePlus phone will only activate when using the special DASH cable. It also appears that without ...
by Paul Hutch
Mon Apr 27, 2020 2:31 pm
Forum: General discussion
Topic: Phone charger - can I use?
Replies: 5
Views: 242

Re: Phone charger - can I use?

Maybe. It depends on the voltage regulation specs of the particular charger. Pi's need 4.75 to 5.25VDC to operate reliably and I recommend 4.85v minimum at full load to be sure aging in the connectors doesn't cause trouble a year or so down the road. With phone chargers the voltage versus current sp...
by Paul Hutch
Fri Apr 24, 2020 12:44 pm
Forum: Advanced users
Topic: Multiple temperature sensors (was Multiple moisture sensors)
Replies: 4
Views: 280

Re: Multiple temperature sensors (was Multiple moisture sensors)

danjperron wrote:
Thu Apr 23, 2020 8:21 pm
Could you give the link for Multiple moisture sensors ?
Click the up arrow at the end of the first line of the quote, that's how I found the 2 year old post.
by Paul Hutch
Thu Apr 23, 2020 12:16 pm
Forum: Advanced users
Topic: Multiple temperature sensors (was Multiple moisture sensors)
Replies: 4
Views: 280

Re: Multiple temperature sensors (was Multiple moisture sensors)

It all depends on the particular sensors, the exact environment, the connection methodology, the amount of component costs you can afford, and the programming & hardware design labor you can afford. The tiny snippet you quoted from that other thread was aimed at a particular usage scenario of a part...

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