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by hippy
Thu Oct 18, 2018 7:56 pm
Forum: Advanced users
Topic: Using my Pi with an AC mains connected preamp.
Replies: 10
Views: 243

Re: Using my Pi with an AC mains connected preamp.

Sorry, I probably should have provided the circuit diagram. It always helps. From that diagram I would say your 12V AC feed is intended to come from the secondary of a standard mains transformer. No need to have either of those two wires connected to mains neutral or earth if you had it, and "don't...
by hippy
Thu Oct 18, 2018 7:37 pm
Forum: General discussion
Topic: Pi zero with connected to two PCs via USB hub
Replies: 4
Views: 73

Re: Pi zero with connected to two PCs via USB hub

For simultaneous access from both PC's you can use two Pi Zeroes, connect them each to their respective PC, create a PPP/SLIP UART interface between the two to transfer from one Pi to the other. I was also thinking, rather than buying USB printer sharing hardware; you could perhaps find or create a ...
by hippy
Thu Oct 18, 2018 7:26 pm
Forum: General discussion
Topic: Pi zero with connected to two PCs via USB hub
Replies: 4
Views: 73

Re: Pi zero with connected to two PCs via USB hub

One can buy USB 'hubs' which allow two PC's to share a USB printer, which might handle what you want. You can probably knock-up some hardware to allow the Pi to cycle between the two PC's rather than have to push its button. The PC's can run software which can tell when it's connected to a Pi and do...
by hippy
Thu Oct 18, 2018 6:33 pm
Forum: Media centres
Topic: New TV Tuner from HQ
Replies: 5
Views: 217

Re: New TV Tuner from HQ

Unfortunately my aerial fall off the roof a long while back and it felt like I lived in a FreeView deprived blind spot at the best of times. Looks nice though; a reasonable price and a perfect fit for the Foundation's educational goals.
by hippy
Thu Oct 18, 2018 6:24 pm
Forum: Python
Topic: Speed of indexing vs looping
Replies: 16
Views: 315

Re: Speed of indexing vs looping

I got muddled up trying to deal with odd length neatly Me too. I'm no Python expert but get by, and it's perhaps a tribute to Python that I can get so much done without being an expert. I know how to strip off front and back characters, get sections from a string. Never had any need to reverse one,...
by hippy
Thu Oct 18, 2018 3:41 pm
Forum: Python
Topic: Speed of indexing vs looping
Replies: 16
Views: 315

Re: Speed of indexing vs looping

I wonder at which point splicing to and from the half length mark would be quicker than the added time it takes to get the length of the string. That's an interesting question. I tested that, as per other tests - def Check_Four(s): n = len(s) // 2 return s[:n] == s[:n-1:-1] Times came in on the sam...
by hippy
Thu Oct 18, 2018 9:09 am
Forum: Python
Topic: Speed of indexing vs looping
Replies: 16
Views: 315

Re: Speed of indexing vs looping

I'm still a bit confused as to whether the for-loop is slower just because of the other operations going on inside it, or whether it's also slower because slices are handled by the interpreter in a more efficient way. The slicing is handled internally by the interpreter more efficiently than you ca...
by hippy
Thu Oct 18, 2018 8:05 am
Forum: Off topic discussion
Topic: When will Pi Zero W be updated?
Replies: 7
Views: 287

Re: When will Pi Zero W be updated?

The main features of the Zero are its small size and low cost. Altering its size would increase costs and adding anything will increase size and cost which would make it less appealing to many and might actually harm sales rather than increase them. There were good reasons for adding CSI and wireles...
by hippy
Thu Oct 18, 2018 7:52 am
Forum: Beginners
Topic: Cable tester for trailers
Replies: 9
Views: 196

Re: Cable tester for trailers

I have to implement "teaching" function, too. When a new cable arrives, the system has to "discover" the cable. That is fairly easy. If you have N connector pins at each end you will have 2N test points. You can create a matrix / array of the 2N inputs for each of the 2N outputs you test. Do the le...
by hippy
Thu Oct 18, 2018 7:28 am
Forum: Advanced users
Topic: Using my Pi with an AC mains connected preamp.
Replies: 10
Views: 243

Re: Using my Pi with an AC mains connected preamp.

The preamp is not grounded, it runs from Live and Neutral only. Now the Neutral is connected directly to the ground plane of the amplifier, meaning any connected device (such as my Pi) will also be connected to AC. With Australian wiring regs so restrictive and huge fines for people who install equ...
by hippy
Wed Oct 17, 2018 2:13 pm
Forum: Mathematica
Topic: Matematica removed from raspbian image
Replies: 34
Views: 2239

Re: Matematica removed from raspbian image

I wonder where the "That said, there's been lots of grumbling, so we might end up putting it back." part comes from. Maybe we aren't party to all the discussions which have gone on and this forum and thread isn't the be-all and end-all of everything ? I personally hope it isn't put back, remains as...
by hippy
Wed Oct 17, 2018 12:05 pm
Forum: General discussion
Topic: Raspberry pi and android app connectivity
Replies: 2
Views: 141

Re: Raspberry pi and android app connectivity

Easiest way IMO is to have a network connection between the two, a Python HTTP server running on the Pi which analyses the GET requests it receives to determine what to do, and a MIT App Inventor 2 created app on the Android phone or tablet making those GET requests. Other programming languages for ...
by hippy
Wed Oct 17, 2018 11:54 am
Forum: General discussion
Topic: Updated FAQ page.
Replies: 22
Views: 873

Re: Updated FAQ page.

"Where's Mathematica gone?" - might be one to add.

I think there's only been one person on the forum asking that so far but I expect there will be more.
by hippy
Wed Oct 17, 2018 10:46 am
Forum: Mathematica
Topic: Matematica removed from raspbian image
Replies: 34
Views: 2239

Re: Matematica removed from raspbian image

https://www.theregister.co.uk/2018/10/1 ... thematica/

"Wolfram Research told The Register that the initial five-year contract had indeed expired, but they had agreed to extend it".

All sorted it seems.
by hippy
Wed Oct 17, 2018 10:35 am
Forum: Android
Topic: Finding any Android OS
Replies: 14
Views: 441

Re: Finding any Android OS

emteria.OS is not based on LineageOS AFAIK. Thanks for your clarification. The reason I suggested it was came from amongst others - "I have been messing around whit my raspberry pi 3 B+ for some time. So now i have emteria.OS on it. It's based on lineage 14.1 and have TWRP 3.1.1-0 on too" - https:/...
by hippy
Wed Oct 17, 2018 10:07 am
Forum: Networking and servers
Topic: pi 3 access point with webservers
Replies: 9
Views: 197

Re: pi 3 access point with webservers

Can you ping the Pi from your laptops, and vice-versa ?

It's difficult to say if the Pi isn't exposing itself properly or the laptops simply aren't seeing what is exposed.
by hippy
Wed Oct 17, 2018 10:03 am
Forum: Advanced users
Topic: Diskless booting Zeroes from Windows
Replies: 75
Views: 2217

Re: Diskless booting Zeroes from Windows

Do you know how to view the currently active leases served by the built-in DHCP server in Windows ICS? Searches on the internet seem to indicate that it is not possible. Do you know how to configure the built-in DHCP server on Windows ICS so it always serves the same IP number to the same MAC addre...
by hippy
Wed Oct 17, 2018 9:39 am
Forum: Beginners
Topic: Cable tester for trailers
Replies: 9
Views: 196

Re: Cable tester for trailers

Cable testing, as you are finding, is not quite so easy as it first seems. You should really only ever have one output at a time, the rest as inputs, that way you avoid outputs being shorted to each other, and can also handle wiring looms which may include diodes. You should also include resistors t...
by hippy
Wed Oct 17, 2018 9:32 am
Forum: Troubleshooting
Topic: Warranty Replacement
Replies: 3
Views: 95

Re: Warranty Replacement

RaTTuS wrote:
Wed Oct 17, 2018 8:04 am
your warranty is with whoever you bought it off,
not the foundation [unless it is a Pi0]
Even with the Pi Zeroes the warranty is most likely through the retailer.
by hippy
Tue Oct 16, 2018 7:56 pm
Forum: Android
Topic: Finding any Android OS
Replies: 14
Views: 441

Re: Finding any Android OS

DarkPlatinum wrote:
Tue Oct 16, 2018 7:45 pm
Since you took his/her question this way i think I stand corrected. Sorry if i have been a nuisance to you. :?
No problem. If I do say things which are wrong I don't mind being corrected and being made better informed. That helps me and ultimately everyone else.
by hippy
Tue Oct 16, 2018 7:42 pm
Forum: Android
Topic: Finding any Android OS
Replies: 14
Views: 441

Re: Finding any Android OS

Please do tell me what "false information" I am supplying. Your statement: "Probably not." This may cause the OP to think differently about what Android platform we are discussing here. ;) I don't know what to say because what I wrote still seems reasonable to me. I took "Does this Emteria.OS, line...
by hippy
Tue Oct 16, 2018 5:49 pm
Forum: Python
Topic: BMP280 Python Script for Thingspeak
Replies: 2
Views: 47

Re: BMP280 Python Script for Thingspeak

This may help as it includes code which seems to do exactly that, albeit for a different sensor, and with a minor bug in the code -

https://www.raspberrypi.org/forums/view ... 2&t=224748
by hippy
Tue Oct 16, 2018 5:45 pm
Forum: General discussion
Topic: Cannot copy SD - no "copy to " selection.
Replies: 10
Views: 398

Re: Cannot copy SD - no "copy to " selection.

I MAY update / upgrade WHEN and IF there is an official note to solve this issue. It is annoying , but I cannot risk another failure ( recent upgrade wiped out my Internet access ) and there are workarounds to backup my RPi OS for now. As others have said; you seem to have a very broken and damaged...
by hippy
Tue Oct 16, 2018 5:20 pm
Forum: Android
Topic: Finding any Android OS
Replies: 14
Views: 441

Re: Finding any Android OS

Does this Emteria.OS, lineage OS work with any android apps? Probably not. But as long as you don't need to use something those versions of Android don't support you should be fine. Probably not. But as long as you don't need to use something those versions of Android don't support you should be fi...
by hippy
Tue Oct 16, 2018 3:28 pm
Forum: Python
Topic: Speed of indexing vs looping
Replies: 16
Views: 315

Re: Speed of indexing vs looping

Ah, forgotten Python was a bit pants with character manipulation. It can be. The moral is: If the Python interpreter can do it for you; let the Python interpreter do it. It will almost always do it quicker than you can do it yourself. Of course, in most cases it doesn't matter. Either that DIY will...

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