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by hippy
Sat Sep 22, 2018 7:02 pm
Forum: Add-ons
Topic: The 5V GPIO Power Question
Replies: 9
Views: 220

Re: The 5V GPIO Power Question

I was under the impression that no Pi models had 5V to the SoC rather than many. The schematic of the RPi1 shows 5V0 connected in 5 places. https://www.raspberrypi.org/app/uploads/2012/04/Raspberry-Pi-Schematics-R1.0.pdf Page 1 grid location 7-E You are correct; the impression I had was clearly wro...
by hippy
Sat Sep 22, 2018 6:46 pm
Forum: General discussion
Topic: Updated FAQ page.
Replies: 6
Views: 214

Re: Updated FAQ page.

References to "Mhz" should be "MHz", "Ghz" should be "GHz", in the table and elsewhere in the text. "The Model A+ is the low-cost variant of the Raspberry Pi" - The Zero, Zero W and Zero WH are all lower cost. Perhaps "lowest-cost, credit card sized, Pi" or similar. "The Pi Zero ... and mini-HDMI an...
by hippy
Sat Sep 22, 2018 1:58 am
Forum: Add-ons
Topic: The 5V GPIO Power Question
Replies: 9
Views: 220

Re: The 5V GPIO Power Question

mahjongg wrote:
Fri Sep 21, 2018 5:40 pm
The SoC itself is also powered directly from 5V, at least in many models of the PI, if not all of them.
Please can you tell us on which Pi models the 5V goes to the SoC.

I was under the impression that no Pi models had 5V to the SoC rather than many.
by hippy
Fri Sep 21, 2018 11:31 pm
Forum: Interfacing (DSI, CSI, I2C, etc.)
Topic: Need Advice: two 250hz square waves 180 out of phase @ 5V
Replies: 3
Views: 81

Re: Need Advice: two 250hz square waves 180 out of phase @ 5V

Need some advice on the best way to achieve two 250Hz square waves @ 5V while being 180 degree out of phase. Do you really mean 180 degrees because that simply requires an inverter - __ __ __ __ PWM : __| |__| |__| |__| |__ ___ __ __ __ __ __ PWM : |__| |__| |__| |__| If you want 90 degree out of p...
by hippy
Fri Sep 21, 2018 1:43 pm
Forum: Beginners
Topic: GPIO Pin Audio Speaker, how?
Replies: 10
Views: 652

Re: GPIO Pin Audio Speaker, how?

connect the '-' from the speaker to the ground pin. connect the '+' to one of GPIO pins. Use PWM library to generate a tone/frequency. That would work if the speaker were a high-impedence piezo, but this seems to be a small but traditional coil-speaker, 3W 4R, which would be too much of a load on a...
by hippy
Fri Sep 21, 2018 1:29 pm
Forum: Python
Topic: os.path to network pc
Replies: 13
Views: 266

Re: os.path to network pc

Thank you so much, it was so simple that I even felt bad. :roll: :oops: I wouldn't. It's one thing saying it should be possible; it's quite another doing it. And doing it has taught me a thing or two, beyond the actual issue raised. Pi purpose served, again. I have some code on my PC doing much the...
by hippy
Thu Sep 20, 2018 11:06 pm
Forum: General discussion
Topic: Which Raspberry Pi Should I Buy
Replies: 27
Views: 630

Re: Which Raspberry Pi Should I Buy

Is the Pi 3B+ overly delicate, a problem variant ? I don't know and it perhaps depends how one chooses to quantify it. All I know is I would not want to be one of the 40 or so members who have reported their Pi 3B+ 'just died' on them for no obvious reason. Exactly. Given that you don't know, why a...
by hippy
Thu Sep 20, 2018 4:44 pm
Forum: Python
Topic: os.path to network pc
Replies: 13
Views: 266

Re: os.path to network pc

I've looked, but I can not find any python commands to mount the drive. This seems to have worked for me - import os import time def Execute(cmd): print( 'Executing ' + cmd + ' ...' ) print( os.popen(cmd).read().strip() ) Execute( 'mkdir -p ./win' ) Execute( 'sudo mount -o user="",password="" //192...
by hippy
Thu Sep 20, 2018 4:06 pm
Forum: General discussion
Topic: Which Raspberry Pi Should I Buy
Replies: 27
Views: 630

Re: Which Raspberry Pi Should I Buy

Not only that but some of those issues caused by people shorting out the Pi whilst powered up. So user error. That 40ish was those I had counted who insist there was no user error. I excluded those who had done something which could explain the failure or where they may have been doing something wr...
by hippy
Thu Sep 20, 2018 2:32 pm
Forum: General discussion
Topic: Which Raspberry Pi Should I Buy
Replies: 27
Views: 630

Re: Which Raspberry Pi Should I Buy

Nah, the 3B+ is as tough as nails. That does not appear to be the case from what members have reported here. The evidence does seem to me to point towards the Pi 3B+ being more likely to suffer terminal failure than previous Pi variants did for the same adverse events, and also more prone to random...
by hippy
Thu Sep 20, 2018 2:10 pm
Forum: Beginners
Topic: GPIO Pin Audio Speaker, how?
Replies: 10
Views: 652

Re: GPIO Pin Audio Speaker, how?

connect the '-' from the speaker to the ground pin. connect the '+' to one of GPIO pins. Use PWM library to generate a tone/frequency. That would work if the speaker were a high-impedence piezo, but this seems to be a small but traditional coil-speaker, 3W 4R, which would be too much of a load on a...
by hippy
Thu Sep 20, 2018 2:01 pm
Forum: Add-ons
Topic: PoE HAT - USB Ports not working - over-current
Replies: 149
Views: 9440

Re: PoE HAT - USB Ports not working - over-current

Not all vendors are showing out of stock https://www.alliedelec.com/raspberry-pi-poe-board/71191981/ I'd spotted that one but did not mention it. If you try and buy one it returns "[!] Material number does not exist" and I couldn't find any link or reference to it from their own product pages, only...
by hippy
Wed Sep 19, 2018 5:56 pm
Forum: General discussion
Topic: Which Raspberry Pi Should I Buy
Replies: 27
Views: 630

Re: Which Raspberry Pi Should I Buy

Shorting out is by and by, as mentioned no evidence. Could just be a 'people say it's that' To a degree. There are those who come here and report they did do something silly, admit they did short things out, or quite possibly did, and are then seeing the No Activity LED problem with the Pi 3B+ so t...
by hippy
Wed Sep 19, 2018 5:28 pm
Forum: General discussion
Topic: Which Raspberry Pi Should I Buy
Replies: 27
Views: 630

Re: Which Raspberry Pi Should I Buy

A lot have people have lost their 3B+ to an accidental short circuit there. Can't remember hearing that before. Can you substantiate that (link to some info source or so)? And how many is 'a lot'? 10s 100s, 1000s? Or even more? I have no idea how many 3B+ Pis have died with the red LED on but no ac...
by hippy
Wed Sep 19, 2018 4:56 pm
Forum: Add-ons
Topic: The 5V GPIO Power Question
Replies: 9
Views: 220

Re: The 5V GPIO Power Question

There is the possibility that they can supply me with a custom connector to a 5V power rail that can do up to 3A per connection. However, that rail runs at 5.2V not exactly 5V. Would this damage the Pi on GPIO? The Pi is officially rated as 5V +/- 5%, 4.75V to 5.25V so your Pi should be okay and be...
by hippy
Wed Sep 19, 2018 4:24 pm
Forum: General discussion
Topic: CB beacon out of raspberry pi
Replies: 9
Views: 250

Re: CB beacon out of raspberry pi

The Pi is not a radio transmitter. It is as much a radio transmitter as anything putting out a waveform to which a bit of wire or antenna can be attached ;) Whether it's a radio transmitter legally allowed to be used is the real question and just connecting a bit of wire or antenna is unlikely to m...
by hippy
Wed Sep 19, 2018 2:10 pm
Forum: Raspbian
Topic: My Pi 3 hacked
Replies: 6
Views: 189

Re: My Pi 3 hacked

deliloy wrote:
Tue Sep 18, 2018 6:09 pm
My question is how can I get it back as I do not have physical access to it
Perhaps you could enrol the assistance of someone who does ?
by hippy
Wed Sep 19, 2018 12:23 pm
Forum: Add-ons
Topic: PoE HAT - USB Ports not working - over-current
Replies: 149
Views: 9440

Re: PoE HAT - USB Ports not working - over-current

We've put a hold on sales for the moment Just to note that while most of the resellers are now "sold out", "awaiting stock" or have removed the product completely, Pimoroni appear to still be offering them for sale - Edited: Now "out of stock" - I'm guessing someone had words 8-) I did note the off...
by hippy
Wed Sep 19, 2018 11:59 am
Forum: Troubleshooting
Topic: 3.3v defect
Replies: 4
Views: 110

Re: 3.3v defect

As best as I can tell it appears you have created an over-current situation which has caused damage. AIUI the Pi does not have any current limit protection which limits any shorting current to 50mA. Draw too much and things can fail.
by hippy
Wed Sep 19, 2018 11:49 am
Forum: General discussion
Topic: I killed it I think...
Replies: 2
Views: 126

Re: I killed it I think...

If you have a multi-meter you can check for presence of the 3V3 supply on the GPIO connector. If that's not present your Pi's destiny could be playing central role in a wake. Which Pi model do you have ? If it's a Pi 3B+ and there's no 3V3 then you have probably damaged the Power Management IC and t...
by hippy
Wed Sep 19, 2018 11:13 am
Forum: Advanced users
Topic: Handle confliction between dhcpcd and /etc/network/interfaces
Replies: 3
Views: 5645

Re: Handle confliction between dhcpcd and /etc/network/interfaces

Another things is that, when I move conflicting settings from /etc/network/interfaces into directory /etc/network/interfaces.d/ ,dhcpcd can be started by systemd successfully. Interesting. I had not seen this post previously. Having now moved my /etc/network/interfaces settings from that file, into...
by hippy
Wed Sep 19, 2018 10:33 am
Forum: Troubleshooting
Topic: 3.3v defect
Replies: 4
Views: 110

Re: 3.3v defect

It is not clear what Pi version you have, what you were doing or have done, but if you short 3V3, other supplies or signals, then you can expect problems, potentially permanent damage. That's the nature of electronics. That things may not fail in some adverse situations but do in others is not indic...
by hippy
Tue Sep 18, 2018 1:10 pm
Forum: Python
Topic: how to send uart break command in python
Replies: 2
Views: 72

Re: how to send uart break command in python

Using the usually used PySerial module you can use 'send_break(duration)'.

https://pyserial.readthedocs.io/en/late ... l_api.html
by hippy
Mon Sep 17, 2018 7:37 pm
Forum: General discussion
Topic: Reporting posts - Clarification sought
Replies: 28
Views: 615

Re: Reporting posts - Clarification sought

Heater wrote:
Mon Sep 17, 2018 7:01 pm
See how insane this is?
No; you are constructing a strawman, ala reductio ad absurdum.

No one has a problem with "classes" or "ballcocks" but there are genuine and acknowledged issues with a master-slave concept and perpetuating it as an acceptable model.
by hippy
Mon Sep 17, 2018 6:48 pm
Forum: General discussion
Topic: Reporting posts - Clarification sought
Replies: 28
Views: 615

Re: Reporting posts - Clarification sought

I saw a headline on The Register about Python dropping master/slave, but I didn't read the article, so I don't know what the proposed alternative is. I believe the alternative they have adopted is "workers" or "helpers" and "parent process". Not sure I like the "workers" suggestion as that just bri...

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