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by Paul Hutch
Wed Aug 07, 2019 1:23 pm
Forum: General discussion
Topic: Why moving to 64bit?
Replies: 259
Views: 20972

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: 1668

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: 13121

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: 13121

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: 18239

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: 361

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: 361

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: 722

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: 13121

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: 2086

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: 1015

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: 319

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. ...
by Paul Hutch
Fri Apr 12, 2019 6:08 pm
Forum: General discussion
Topic: GIVE YOUR RASPBERRY PI SD CARD A BREAK: LOG TO RAM
Replies: 19
Views: 6551

Re: GIVE YOUR RASPBERRY PI SD CARD A BREAK: LOG TO RAM

Excellent license choice, well known, OSI approved, and legally tested, thanks for adding it. I'll be trying your scripts to use in a work project early next week.
by Paul Hutch
Wed Apr 10, 2019 3:32 pm
Forum: Advanced users
Topic: Changing boot order or stopping programs from loading
Replies: 2
Views: 261

Re: Changing boot order or stopping programs from loading

Just tried the raspi-config option and at least on the latest Raspbian Lite, it does not wait for what most people consider a valid network connection. It allows boot to complete even if there is no LAN connection via eth0 and wlan0 due to unplugged cable and no valid SSID/key pair.
by Paul Hutch
Wed Apr 10, 2019 2:45 pm
Forum: General discussion
Topic: GIVE YOUR RASPBERRY PI SD CARD A BREAK: LOG TO RAM
Replies: 19
Views: 6551

Re: GIVE YOUR RASPBERRY PI SD CARD A BREAK: LOG TO RAM

I suggest you have a look at https://github.com/StuartIanNaylor/zram-config <snip> Looking to build a community around https://github.com/StuartIanNaylor/zram-config so any ideas or issues please post away and get involved as claim no ownership just annoyed me so many utils for this application are...
by Paul Hutch
Wed Apr 10, 2019 1:24 pm
Forum: Python
Topic: How to check to see if a process is running via subprocess, and not do it if it already exists.
Replies: 4
Views: 957

Re: How to check to see if a process is running via subprocess, and not do it if it already exists.

subprocess.Popen has a built-in method to determine if the subprocess is still running, Popen.poll().

In your code process.Popen.poll() will return the state of the process.

https://docs.python.org/3/library/subpr ... en-objects
by Paul Hutch
Wed Apr 10, 2019 1:05 pm
Forum: Advanced users
Topic: Pi 3 b+ power supply issue
Replies: 13
Views: 1486

Re: Pi 3 b+ power supply issue

I already check on the data sheets. The GNSS/GPS/GSM HAT requires 5Volt (operating voltage) in addition the 7 inch display is connected directly to raspberry pi's usb port. The last one, IMU sensor, is connected to the GPIO header (3.3V pin e uart pins). You also need to look for the current requir...
by Paul Hutch
Wed Apr 10, 2019 11:42 am
Forum: Advanced users
Topic: WiFi Connection manager with fallback web configuration portal
Replies: 7
Views: 660

Re: WiFi Connection manager with fallback web configuration portal

Thank you very much dividuum, that looks like a good solution for many users.
by Paul Hutch
Mon Apr 08, 2019 3:20 pm
Forum: General discussion
Topic: Raspberry Pi 2 RS232 Wireless transmitter
Replies: 2
Views: 313

Re: Raspberry Pi 2 RS232 Wireless transmitter

I've used devices similar to this one in the past.
http://www.nordfield.com/wireless-seria ... th-adapter
by Paul Hutch
Thu Apr 04, 2019 6:26 pm
Forum: Weather station
Topic: Temps are off by about 10 degrees (F)
Replies: 11
Views: 6842

Re: Temps are off by about 10 degrees (F)

A 5°F difference between roof level and ground level is not uncommon even with no direct sun on the sensor, with sun I've measured 15°F differences. The air up high is just not the same temperature as the air at the normal air temperature measurement height of ~1.5m. https://www.weatherworksinc.com/...
by Paul Hutch
Wed Apr 03, 2019 2:51 pm
Forum: Advanced users
Topic: Voltage reduction under thermal throttling
Replies: 7
Views: 541

Re: Voltage reduction under thermal throttling

There are three voltage/frequency setpoints for the 3B+ <snipped excellent information> Thank you for the info, one of the best things about this forum is how many RasPi engineers come to help us all out, keep up the good work. A big thanks to all of you, the rest of the RasPi staff, volunteer mode...
by Paul Hutch
Wed Apr 03, 2019 2:43 pm
Forum: General discussion
Topic: 3.3v Relay Exists?
Replies: 7
Views: 966

Re: 3.3v Relay Exists?

This not suited for your requirements? https://uk.rs-online.com/web/p/non-latching-relays/6839258/ Unfortunately that particular unit, and every traditional coil based 3V relay I've encountered, requires too much current for direct drive from the 3.3V GPIO of a Raspberry Pi. The linked relay has a ...
by Paul Hutch
Tue Apr 02, 2019 6:09 pm
Forum: Advanced users
Topic: Voltage reduction under thermal throttling
Replies: 7
Views: 541

Re: Voltage reduction under thermal throttling

I ran some some stress tests with a RasPi 3B+ with no heatsink and a sealed case, in an oven at 65°C ambient earlier this year to see how hot I could make it. I ran out of time and wasn't able to push it as far as I wanted but I did get it to throttle down to 600 MHz and the lowest I saw for a core ...
by Paul Hutch
Tue Apr 02, 2019 5:55 pm
Forum: Advanced users
Topic: WiFi Connection manager with fallback web configuration portal
Replies: 7
Views: 660

Re: WiFi Connection manager with fallback web configuration portal

From what I've read nobody who has coded this type of system for the Raspberry Pi has released it as free software. Later this year I'll be working on this functionality for a work project and I intend it to be FLOSS, but do to work time constraints I'm certain I won't be able to get the project set...
by Paul Hutch
Fri Mar 29, 2019 10:42 am
Forum: General discussion
Topic: Measuring Pi power with a Keweisi USB tester
Replies: 3
Views: 248

Re: Measuring Pi power with a Keweisi USB tester

Assuming that the phone charging is at a much higher current than 100mA, the Keweisi USB tester may not be accurate at lower current values. Large variation in accuracy over the measurement range is a common accuracy problem of low cost measurement devices.

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