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by Paul Hutch
Thu Feb 14, 2019 5:30 pm
Forum: General discussion
Topic: Weather station in freezing weather: questions
Replies: 17
Views: 416

Re: Weather station in freezing wheather: questions

At this point, I think it's reasonable to think that any random Pi will *probably* function in moderate below freezing temperatures...and if a given Pi doens't, the next one will. It's just as reasonable to think that any given Pi will *probably* NOT work reliably below freezing. So it's a gamble, ...
by Paul Hutch
Thu Feb 14, 2019 11:39 am
Forum: General discussion
Topic: Weather station in freezing weather: questions
Replies: 17
Views: 416

Re: Weather station in freezing wheather: questions

Can't help you the instruments, but you needn't worry about the Pi itself. A researcher at CERN managed to make one fail by getting too cold. It quit working at -180C. I had my one outdoor mounted RasPi quit working at around -20°C. Single piece experiences are merely anecdotes, without a spec from...
by Paul Hutch
Mon Feb 11, 2019 3:28 pm
Forum: General discussion
Topic: Is Raspberry Pi capable of replacing 2 wire thermostat
Replies: 8
Views: 320

Re: Is Raspberry Pi capable of replacing 2 wire thermostat

This is one of those projects that will take far more time and cost far more money than any plan will estimate. Plus it may cause grief if bugs in your custom system leave the heat off and you get real cold, leave it on wasting oil, or off while your away and the house pipes freeze and your insuranc...
by Paul Hutch
Fri Feb 01, 2019 11:39 am
Forum: Android
Topic: [android] DHCP Client not assigning the Auto IP
Replies: 6
Views: 239

Re: DHCP Client not assigning the Auto IP

You'll probably get more help if you ask in the Android sub-forum.
https://www.raspberrypi.org/forums/viewforum.php?f=73
by Paul Hutch
Thu Jan 31, 2019 2:07 am
Forum: General discussion
Topic: Using the Raspberry Pi logo
Replies: 20
Views: 695

Re: Using the Raspberry Pi logo

jamesh, Why should the owners of the trademark, on their own webpage, have to put a (R) on it? That is a very good question and one that has been puzzling me for some time. Even Intel does it, for example: 9th Gen Intel® Core™ S-series processors brief From Intel's web page here: https://www.intel....
by Paul Hutch
Wed Jan 30, 2019 4:52 pm
Forum: General discussion
Topic: Using the Raspberry Pi logo
Replies: 20
Views: 695

Re: Using the Raspberry Pi logo

"You may only use the Raspberry Pi Logo in connection with the sale or distribution of genuine Raspberry Pi products or services." Which means I technically cannot use the logo in an intro. Looking at the visual rules, I see that it says that your not allowed to remove the trademark from the logo. ...
by Paul Hutch
Wed Jan 30, 2019 4:28 pm
Forum: General discussion
Topic: I'm trying to design a timing system for an engine
Replies: 1
Views: 113

Re: I'm trying to design a timing system for an engine

I'm assuming you mean a system for ignition timing of an internal combustion engine for real world usage. If it's a model engine, steam engine, etc. then ignore what follows. IMO, a Rapspberry Pi, or any Linux compatible SBC, is possibly the worst choice for an engine timing system. An Arduino would...
by Paul Hutch
Sat Jan 26, 2019 3:32 pm
Forum: General discussion
Topic: Recommend a decent power supply
Replies: 9
Views: 473

Re: Recommend a decent power supply

Imperf3kt wrote:
Sat Jan 26, 2019 12:49 pm
Why not use the official power supply plus a short, say 1.5m, extension cable?
The extra connectors and double the wire length may very well cause too much voltage drop. A better option is to cut out the original wire and solder splice in a larger gauge wire 3m long.
by Paul Hutch
Tue Jan 22, 2019 4:36 pm
Forum: Advanced users
Topic: Accurate timing for real time control
Replies: 27
Views: 49839

Re: Accurate timing for real time control

Hi There - need some advice. I want to read an analog-to-digital input from the ADS1015 ADC, via I2C bus. The data will be a graph, clocked at about 3Khz. This link suggests using the AnalogIn function to read the analog channel. https://learn.adafruit.com/adafruit-4-channel-adc-breakouts/python-ci...
by Paul Hutch
Mon Jan 21, 2019 2:45 pm
Forum: Advanced users
Topic: GPIO-POWEROFF: Is it safe to immediately cut power off when pin goes LOW?
Replies: 3
Views: 249

Re: GPIO-POWEROFF: Is it safe to immediately cut power off when pin goes LOW?

I can only see about 3-4 blinks of the ACT LED when issuing sudo shutdown -h now but if I shutdown without using the GPIO-POWEROFF the ACT LED certainly blinks more about 10 flashes. I was trying out the gpio-poweroff overlay this weekend and I saw the same thing. When I use the overlay, instead of...
by Paul Hutch
Fri Jan 11, 2019 11:32 am
Forum: General discussion
Topic: Geany Error
Replies: 8
Views: 333

Re: Geany Error

Update - I used a new SD card with a fresh copy of Stretch - Geany ran perfectly with all the programs I have been developing in Python, ran them all repeatedly with no errors and no crashing. Put back the SD card with the crashing Geany, and Geany will only run once, irrespective of whatever pytho...
by Paul Hutch
Tue Jan 08, 2019 12:50 am
Forum: General discussion
Topic: Heatsink required for Raspberry Pi 3 B+?
Replies: 59
Views: 37378

Re: Heatsink required for Raspberry Pi 3 B+?

From what I've been told here on the forum a Raspberry Pi will not stop from overheating, therefore something other that overheating is causing it to stop completely.
by Paul Hutch
Sat Dec 29, 2018 2:33 pm
Forum: Raspberry Pi Desktop for PC and Mac
Topic: Raspberry Pi Desktop on a 64-bit VirtualBox VM
Replies: 8
Views: 2515

Re: Raspberry Pi Desktop on a 64-bit VirtualBox VM

Hello People, I have been struggling to get this project off the ground since 24/12/18. It is now 27/12/17 and I hope I have stumbled upon an answer. Perhaps it is DO NOT USE 64 Bit Use 32 Bit, I really hope so. I have successfully (up to a point) got Raspberry Pi working inside the VirtualBox on m...
by Paul Hutch
Sat Dec 22, 2018 7:03 pm
Forum: Raspberry Pi Desktop for PC and Mac
Topic: Can't Install Geany
Replies: 13
Views: 1243

Re: Can't Install Geany

Thanks for all the replies. It's good to confirm it's not just me screwing up there is a little distro version glitch, and great to get info on ways to work around the issue.
by Paul Hutch
Sat Dec 22, 2018 12:36 pm
Forum: Raspberry Pi Desktop for PC and Mac
Topic: Can't Install Geany
Replies: 13
Views: 1243

Re: Can't Install Geany

code_exec wrote:
Sat Dec 22, 2018 5:26 am
I advise you to run sudo apt update to update the package lists and then try again.
That was tried multiple times before making the OP.
by Paul Hutch
Tue Dec 18, 2018 1:53 pm
Forum: General discussion
Topic: Extending power supply cable using Cat6 pair
Replies: 8
Views: 334

Re: Extending power supply cable using Cat6 pair

To figure out the voltage drop you can use this spreadsheet. https://docs.google.com/spreadsheets/d/1_Z_ef7yN4aqKFH5u5rLQuIe44sPckPo6ikrf9Xva41o/edit?usp=sharing To see how much current it takes to fuse (melt) wires see this chart. https://www.powerstream.com/wire-fusing-currents.htm ETA 12/19 - For...
by Paul Hutch
Fri Dec 14, 2018 8:31 pm
Forum: General discussion
Topic: Windows Share suddenly stopped working
Replies: 12
Views: 414

Re: Windows Share suddenly stopped working

If the server is Windows 10 or Windows Server then it may be that a Windows update disabled SMB 1.0. I know it's been happening for many home network users making some NAS and other network devices no longer appear on the network, most home users are opting to turn SMB 1.0 back on as the easy, albei...
by Paul Hutch
Fri Dec 14, 2018 8:06 pm
Forum: Raspberry Pi Desktop for PC and Mac
Topic: Can't Install Geany
Replies: 13
Views: 1243

Can't Install Geany

In the latest version of RPD Add/Remove Software silently fails when trying to install Geany. When I tried, sudo apt install geany, I get this error message. Some packages could not be installed. This may mean that you have requested an impossible situation or if you are using the unstable distribut...
by Paul Hutch
Fri Dec 14, 2018 4:27 pm
Forum: General discussion
Topic: Raspberry pi as a local network
Replies: 3
Views: 166

Re: Raspberry pi as a local network

If you can physically locate the RasPi close to the router you can use the wired Ethernet between the Pi and router instead of adding a second WiFi adapter.
by Paul Hutch
Fri Dec 14, 2018 4:20 pm
Forum: General discussion
Topic: Raspberry Pi or Arduino better for the job?
Replies: 4
Views: 233

Re: Raspberry Pi or Arduino better for the job?

IMO an Arduino, or any microcontroller with built-in A2D and precision counting/timing, will be better for the measuring parts of the application. The uploading to an online database is easier on a Raspberry Pi or any SBC. If I was doing this project I'd probably have a microcontroller making the me...
by Paul Hutch
Fri Dec 14, 2018 1:04 am
Forum: General discussion
Topic: Minimum and maximum operating temperature for raspberry pi 3
Replies: 11
Views: 600

Re: Minimum and maximum operating temperature for raspberry pi 3

I had a Pi0W halt at -20°C after multiple days below -10°C. Keep in mind that the operating temperature range of the uSD card, power supply, and other peripherals you use will often be the limiting components. In my case I have no idea whether mine stopped due to the Pi, the uSD, the power supply or...
by Paul Hutch
Fri Dec 14, 2018 12:52 am
Forum: General discussion
Topic: Tweaking Raspbian img
Replies: 11
Views: 488

Re: Tweaking Raspbian img

This post describes how I create my custom images. The images end up small and automatically expand to fill the uSD card on first use.
viewtopic.php?f=29&t=228353&p=1400649#p1400649
by Paul Hutch
Thu Dec 13, 2018 9:50 pm
Forum: General discussion
Topic: STICKY: Pi 3 A+
Replies: 123
Views: 20308

Re: STICKY: Pi 3 A+

The standard requires a minimum of 0.5A, more current can be made available but is not required by the standard e.g. charging port on my HP workstation can supply 1.5A. I also have a USB hub with a 4A adapter that can supply 1.5A on each of the two charging ports. https://www.newark.com/stellar-labs...
by Paul Hutch
Thu Dec 06, 2018 12:14 am
Forum: Python
Topic: Pyserial - 'device reports readiness to read but returned no data '
Replies: 7
Views: 974

Re: Pyserial - 'device reports readiness to read but returned no data '

Having looked at the serialposix.py module source; it looks to be something like that. The weird thing is why this would happen with a hard-wired on-chip peripheral ? That would be more understandable with a USB serial cable which could get disconnected between checking if there's anything to read ...
by Paul Hutch
Wed Dec 05, 2018 3:21 pm
Forum: Python
Topic: Pyserial - 'device reports readiness to read but returned no data '
Replies: 7
Views: 974

Re: Pyserial - 'device reports readiness to read but returned no data '

"'device reports readiness to read but returned no data ' serial.serialutil.SerialException: device reports readiness to read but returned no data ( device disconnected or multiple access on port?)" The part of the error message I made bold tells me this is an error that covers many types of common ...

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