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by Paul Hutch
Thu Sep 12, 2019 8:51 pm
Forum: General discussion
Topic: serial connection with RFID equipment
Replies: 1
Views: 43

Re: serial connection with RFID equipment

I don't know if this will work but I'd try using /dev/ttyACM0 for the port name.
by Paul Hutch
Sat Sep 07, 2019 3:46 pm
Forum: General discussion
Topic: How to measure RPM using a Hall Effect Sensor
Replies: 11
Views: 340

Re: How to measure RPM using a Hall Effect Sensor

What is the frequency of the pulses in your application?

This is the type of application where, depending on the frequency, a microcontroller (possibly an Arduino) may be a much simpler, lower cost, lower power and more reliable solution.
by Paul Hutch
Sat Sep 07, 2019 3:01 pm
Forum: Python
Topic: Data input from an A/V cable
Replies: 11
Views: 529

Re: Data input from an A/V cable

This should have been the first reply in this thread.

What type of A/V cable?

What type of A/V data is used with the cable?
by Paul Hutch
Fri Sep 06, 2019 10:38 am
Forum: General discussion
Topic: crosscompile Qt5 on raspberry 4
Replies: 2
Views: 188

Re: crosscompile Qt5 on raspberry 4

Based on a recent post in the Python sub-forum, I believe QT5 (and PyQT5) is already an APT installable package for Buster.
by Paul Hutch
Fri Sep 06, 2019 10:23 am
Forum: Python
Topic: PyQt5 on Raspbian: Background color of QWidgets is not displayed
Replies: 7
Views: 223

Re: PyQt5 on Raspbian: Background color of QWidgets is not displayed

OK we can now be pretty sure it's not dependancy problem. I did a Google search and find that for many years this has been a common problem for users with QT (many QT forum posts). This thread seems to point to the root of the issue: https://forum.qt.io/topic/93418/cant-change-color-of-progressbar/8...
by Paul Hutch
Wed Sep 04, 2019 2:19 pm
Forum: Python
Topic: PyQt5 on Raspbian: Background color of QWidgets is not displayed
Replies: 7
Views: 223

Re: PyQt5 on Raspbian: Background color of QWidgets is not displayed

I've compiled and installed PyQt5 on a Raspberry Pi 3B+ running Raspbian Buster like described here . It took a few hours, but it worked. That StackExchange post is 2 years old so is likely obsolete in some way (I consider 6 months to be the shelf life of those type of posts). I haven't used Buster...
by Paul Hutch
Wed Aug 28, 2019 1:55 pm
Forum: General discussion
Topic: School project involving freezer
Replies: 9
Views: 373

Re: School project involving freezer

An experiment of a poorly described hypothesis that has had many inconsistent results due to the huge number of confounding variables is about the worst possible choice for an educational experience for a student.
by Paul Hutch
Mon Aug 26, 2019 1:20 pm
Forum: General discussion
Topic: Why moving to 64bit?
Replies: 259
Views: 17599

Re: Why moving to 64bit?

Ok, when is the 64-bit Raspbian coming out then? Just in time for the Pi 5. :roll: You've been around here long enough to know that release dates are never announced in advance. That soon? I'd expect more around the time of the Pi6 or Pi7. From 20 days ago at the beginning of this thread: I expect ...
by Paul Hutch
Fri Aug 23, 2019 7:54 pm
Forum: General discussion
Topic: Wifi
Replies: 2
Views: 106

Re: Wifi

I think you need to manually edit the configuration file to connect to a network with a hidden SSID. The documentation in the link below has instructions for hidden SSID setup.
https://www.raspberrypi.org/documentati ... ess-cli.md
by Paul Hutch
Sun Aug 18, 2019 12:46 pm
Forum: General discussion
Topic: Are Speaker Magnets A Problem For Pi?
Replies: 18
Views: 1692

Re: Are Speaker Magnets A Problem For Pi?

Just as an addendum, it's perhaps worth noting that the magnetic devices on board the Pi were designed to be as efficient as possible, which means they don't spray magnetic fields around if at all possible. The corollary is that stray magnetic fields around them have little effect. Speakers should ...
by Paul Hutch
Fri Aug 16, 2019 11:20 pm
Forum: General discussion
Topic: Are Speaker Magnets A Problem For Pi?
Replies: 18
Views: 1692

Re: Are Speaker Magnets A Problem For Pi?

If you discover a problem, mount a sheet of steel between the speaker and the Pi. Magnetic fields are tricky to shield. A simple sheet will just cause the field to wrap around the sides. This is based on spending much money and engineering effort to try and shield CRT monitors from a large transfor...
by Paul Hutch
Thu Aug 15, 2019 9:04 pm
Forum: General discussion
Topic: Official Keyboard and mouse
Replies: 33
Views: 1180

Re: Official Keyboard and mouse

I liked that keyboard, but it was not cost-effective. Mine lasted just beyond the warranty period. At the time, I think that was 3 years, so about $30/yr. MY Unicomp keyboard is (IIRC) over 10 years old and works just fine. Even if memory has failed, I had it before I got my first Pi in 2012. Not s...
by Paul Hutch
Wed Aug 14, 2019 11:55 pm
Forum: General discussion
Topic: Official Keyboard and mouse
Replies: 33
Views: 1180

Re: Official Keyboard and mouse

At home, both of us use Unicomp keyboards The finest keyboards I've ever bought, I have one in each work area of my home office connected to KVM's so Unicomp's drive 4 PC's and 3 Pi's. https://www.pckeyboard.com/ Why purchase an imitator when you can buy the original “Model M”. We have produced the...
by Paul Hutch
Wed Aug 07, 2019 1:23 pm
Forum: General discussion
Topic: Why moving to 64bit?
Replies: 259
Views: 17599

Re: Why moving to 64bit?

I had a 64b Alpha workstation in 1998-1999, after leaving university with its fleet of 64b Irix desktops. So yes, at least 20 years. Around 1996 we installed our first non-Novell server at work and it was a DEC Alpha based system. We ran NT 4.0 and were looking forward to the soon to be released 64...
by Paul Hutch
Tue Aug 06, 2019 12:18 pm
Forum: Python
Topic: Get pi CPU temp and load
Replies: 12
Views: 1544

Re: Get pi CPU temp and load

I've had good luck using the psutil library for getting CPU load.
https://pypi.org/project/psutil/
by Paul Hutch
Mon Aug 05, 2019 11:45 pm
Forum: General discussion
Topic: Pi Warranty?
Replies: 17
Views: 12962

Re: Pi Warranty?

Are you an employee, or somehow associated with Adafruit? Nope just someone who has seen many people on the Adafruit forum get warranty replacements for opened but defective products. The only posts I've seen where the warranty was refused were people who damaged the product themselves or waited to...
by Paul Hutch
Sat Aug 03, 2019 11:45 am
Forum: General discussion
Topic: Pi Warranty?
Replies: 17
Views: 12962

Re: Pi Warranty?

My personal experience with them was basically that "once you powered on the product, it has been used and returns are not accepted". Basically its all your fault - and if you don't agree its your fault, they ban you from their forum. Please provide a link to the Adafruit support forum posts where ...
by Paul Hutch
Tue Jul 30, 2019 7:11 pm
Forum: General discussion
Topic: High Endurance SD card
Replies: 47
Views: 17360

Re: High Endurance SD card

<snip> I am careful to buy only cards that are "sold and shipped by Amazon", as they seem to have a reliable supplier and they always send cards in their original factory packaging (definitely not frustration free but worth the trouble) <snip> My employer just started working with Amazon this year ...
by Paul Hutch
Mon Jul 29, 2019 2:26 pm
Forum: General discussion
Topic: Raspberry UPS
Replies: 8
Views: 338

Re: Raspberry UPS

Thanks for the link.

I'd even used their search using a copy paste of the name in the post, Pi Juice, and this is what it showed.
https://uk.pi-supply.com/search?type=product&q=Pi+Juice
by Paul Hutch
Mon Jul 29, 2019 2:00 pm
Forum: General discussion
Topic: Raspberry UPS
Replies: 8
Views: 338

Re: Raspberry UPS

Andyroo wrote:
Mon Jul 29, 2019 10:31 am
Have a look at Pi Juice from Pi Supply - https://uk.pi-supply.com
All I see at the link is a Pi Zero only, crowdfunding project that might ship in October, not a product that can be purchased and used with a Pi3.

Am I missing something?
by Paul Hutch
Sat Jul 27, 2019 1:52 pm
Forum: Python
Topic: trying to import RPi.GPIO in module
Replies: 21
Views: 655

Re: trying to import RPi.GPIO in module

It's hard to tell without the essential Python formatting, please use the code tags to preserve formatting of code. However I think the problem is that: def setPwm(self, gpio): Should be: def setPwm(self): Also remove any parameter in the code that calls your setPwm(). With a global import you can r...
by Paul Hutch
Sat Jul 27, 2019 1:33 pm
Forum: General discussion
Topic: Pi Warranty?
Replies: 17
Views: 12962

Re: Pi Warranty?

I second the above - do not buy from Adafruit. I have three Pi Zero Ws from them, and all three overheated and died. The one from Element14 worked totally fine for years in the same environment and equipment. Same as above, Adafruit refused to provide any refunds. Note that Adafruit return policy h...
by Paul Hutch
Fri Jul 26, 2019 5:51 pm
Forum: General discussion
Topic: 1A battery as UPS
Replies: 22
Views: 2002

Re: 1A battery as UPS

Paul, how did that work out in the end? - and what make/model of power bank was it? Cheers, Ian . It works great! Unfortunately even after taking it apart to read the PCB I was unable to figure out who made it. My sister had bought 10 of them from an eBay seller for $20 in 2015 and that seller is n...
by Paul Hutch
Tue Jul 23, 2019 2:30 pm
Forum: General discussion
Topic: What do these services do?
Replies: 16
Views: 924

Re: What do these services do?

Those are all the default services that make a Raspberry Pi running Raspbian work and provide all the normal features. You can get details of each one by doing an internet search on the service name surrounded by quotation marks to get exact matches e.g. "networking.service" gives me: https://www.go...
by Paul Hutch
Wed Jul 17, 2019 1:00 am
Forum: Advanced users
Topic: Pi 3B+ Ethernet Bug
Replies: 0
Views: 303

Pi 3B+ Ethernet Bug

I'm not sure exactly what is causing this bug. It could be hardware, the Linux driver, or Raspbian Lite's driver integration/version, so I'm posting it here. I've tested this behavior on multiple Pi 3B+'s using the latest version of Raspbian Stretch Lite fully updated, and on three different LAN's. ...

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