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by hippy
Thu Apr 26, 2018 3:28 pm
Forum: Other projects
Topic: Create a screen from a digital frame
Replies: 1
Views: 43

Re: Create a screen from a digital frame

Can I use it as a screen for my raspberry. Another question which comes up so often it deserves its own FAQ. I would say that hoping to be able to use some random screen from something else with a Pi is an unrealistic expectation, overly optimistic, and, even if possible, not worth the effort or co...
by hippy
Thu Apr 26, 2018 3:19 pm
Forum: Advanced users
Topic: Mean of 60 temperature sensors
Replies: 11
Views: 285

Re: Mean of 60 temperature sensors

I would say there are numerous ways to put 60 temperature sensors on each floor. From a single microntroller controlling all 60 sensors, through a number of micros each controlling fewer sensors, to 60 micros each controlling a single sensor. The connections from each micro could be wired or wireles...
by hippy
Thu Apr 26, 2018 3:01 pm
Forum: Off topic discussion
Topic: Application-bot
Replies: 12
Views: 396

Re: Application-bot

Is there a way to make a bot on my raspberry pi b+ that receives the email as a trigger then logs into their site and submits my application again? :oops: :oops: :oops: For the first part yes; you should be able to receive the email, determine that is an auto-reply and a trigger to re-submit your a...
by hippy
Thu Apr 26, 2018 11:29 am
Forum: Python
Topic: How ist the best approach for task sharing in Py?
Replies: 9
Views: 165

Re: How ist the best approach for task sharing in Py?

A single program with multiple threads may be the solution. Thank you, I will try that. It has apparently a steep learning curve, for a noob. Hardly I would say. In fact it's 'a doddle' as we would say in the UK ... #!/bin/usr/python import threading import time def ThreadOne(): while True: print "...
by hippy
Thu Apr 26, 2018 10:37 am
Forum: Python
Topic: How ist the best approach for task sharing in Py?
Replies: 9
Views: 165

Re: How ist the best approach for task sharing in Py?

rin67630 wrote:
Thu Apr 26, 2018 7:11 am
Have I got a chance to share big array without writing to disk?
A single program with multiple threads may be the solution.
by hippy
Wed Apr 25, 2018 7:45 pm
Forum: General discussion
Topic: Industrial Reliability for 24/7 Use
Replies: 34
Views: 1078

Re: Industrial Reliability for 24/7 Use

hippy, My sole point was that one cannot verify for oneself to the best of one's abilities that a Pi's hardware is "rock solid" because we don't have full circuit diagrams and electrical specs. By that criteria one would never use anything. Not at all. I am not saying only use things which are prov...
by hippy
Wed Apr 25, 2018 2:04 pm
Forum: General programming discussion
Topic: Making robot follow gps
Replies: 7
Views: 208

Re: Making robot follow gps

I want to make an autonomous ROV that’s like a submersible. That's quite an ambitious project and, if you are baffled by Arduino, would probably be a project beyond you at present. That's not to say you can't do it or won't ever be able to but it would be best to set your sights on simpler projects...
by hippy
Wed Apr 25, 2018 12:18 pm
Forum: Troubleshooting
Topic: Extracting Data from Serial Stream using USB / UART
Replies: 10
Views: 186

Re: Extracting Data from Serial Stream using USB / UART

ok, stupid follow-up question. Is it possible to write a python script to watch the data stream, watch for the sequence noted above, pull out the count (in this case 00), add a time stamp and newline in a log file? Short answer; yes. Long answer; don't really have time for an example but basically ...
by hippy
Wed Apr 25, 2018 12:13 pm
Forum: General discussion
Topic: Connecting several RPi 3 model B via USB
Replies: 25
Views: 580

Re: Connecting several RPi 3 model B via USB

Thanks hippy. May I ask which version of Linux you are running (link would be helpful) just to make sure there is no driver issue. It was Raspbian Jessie, perhaps even Wheezy, when I tested my link cables. The latest Raspbian Stretch is what should preferably be used. I recall it is a simple as jus...
by hippy
Wed Apr 25, 2018 11:14 am
Forum: General discussion
Topic: compute or RPi 3 B/B+ motherboard sized for ITX case
Replies: 5
Views: 265

Re: compute or RPi 3 B/B+ motherboard sized for ITX case

One of the great things about the Pi is how small it is. What's the thought process behind wanting to make it unnecessarily large? In my case it's mostly wanting to have sockets and SD card access where I want them, rather than where the board has them. I like to include a mains PSU within the case...
by hippy
Wed Apr 25, 2018 10:56 am
Forum: General discussion
Topic: Cat 5 for 5V and Ground
Replies: 6
Views: 232

Re: Cat 5 for 5V and Ground

I'm looking at running a traffic light system about 1m from the pi. For such a short distance with only a few standard LED's I would have thought pretty much anything would be fine; ribbon cable, hook-up wire, Cat 5, telephone, alarm or audio cable. You can pair-up cores to handle more current if r...
by hippy
Wed Apr 25, 2018 9:12 am
Forum: General discussion
Topic: Industrial Reliability for 24/7 Use
Replies: 34
Views: 1078

Re: Industrial Reliability for 24/7 Use

I would claim that burning out that diode was only caused by badly designed HDMI to VGA adapters What was implemented on the Pi did not AFAICT meet the HDMI source powering specification in that it was not current limited as required to ameliorate over-current situations caused by faulty devices be...
by hippy
Wed Apr 25, 2018 8:49 am
Forum: General discussion
Topic: Connecting several RPi 3 model B via USB
Replies: 25
Views: 580

Re: Connecting several RPi 3 model B via USB

@hippy: thanks for the tip! Do you have any recommendation for such a cable? And how do I use it in my SW? Which communication protocol would you recommend? Your help is much appreciated. I don't have any recommendation for cables; mine are all generic and unlabelled. The ones I plugged into my Pi ...
by hippy
Tue Apr 24, 2018 7:41 pm
Forum: General discussion
Topic: Connecting several RPi 3 model B via USB
Replies: 25
Views: 580

Re: Connecting several RPi 3 model B via USB

The Pi 3B, 3B+ and most Pi's only have host USB capability so cannot communicate directly between their USB ports.

You would need some sort of bridge interface, commonly a 'USB network transfer cable' between each pair of connected USB ports.
by hippy
Tue Apr 24, 2018 4:56 pm
Forum: General discussion
Topic: Industrial Reliability for 24/7 Use
Replies: 34
Views: 1078

Re: Industrial Reliability for 24/7 Use

all now fixed, apart form being able to short GPIO pins - cannot change that now) I am a bit surprised by that, though we may be referencing different things. I am not talking about user-exposed GPIO but those I/O pins used only on-board which can accidentally or inadvertently be made output, cause...
by hippy
Tue Apr 24, 2018 4:10 pm
Forum: General discussion
Topic: Are Raspberry Pi and other microcontrollers scalable for commercial projects?
Replies: 13
Views: 416

Re: Are Raspberry Pi and other microcontrollers scalable for commercial projects?

My question would be if there are any companies that are using Raspberry Pi, Arduino etc. with simple sensors for a commercial use? Quite possibly. It would seem unlikely a Pi will be appearing in many sensors because of the rather high current requirements it has, lack of low power modes and power...
by hippy
Tue Apr 24, 2018 3:48 pm
Forum: Other languages
Topic: BBC BASIC for iOS
Replies: 10
Views: 406

Re: BBC BASIC for iOS

The Raspberry Pi is a light which encourages ownership and in this age shines against the hopelessness of digital feudalism. I wonder how RPT, the RPF, Broadcom and others would react if I published the full source of the VC4 code and other binary blobs, what the consequences would be for telling p...
by hippy
Tue Apr 24, 2018 11:43 am
Forum: Beginners
Topic: How can the raspberry be shutdown with a python script and no sudo?
Replies: 6
Views: 184

Re: How can the raspberry be shutdown with a python script and no sudo?

Looking in the Python program which I run without sudo I have ...

Code: Select all

while True:
  if GPIO.input(GPIO_BUTTON) == 0:
    result = os.popen("sudo shutdown -h now").read()
    return
  time.sleep(0.1)
by hippy
Tue Apr 24, 2018 11:00 am
Forum: Other languages
Topic: BBC BASIC for iOS
Replies: 10
Views: 406

Re: BBC BASIC for iOS

Were it not for Raspberry Pi, the days would soon be upon us where it is against the law by beach of contract for a child or anyone else to create a computer program without a proper engineering license or company affiliation. That's the best hyperbolic nonsense I have read in a long time. Both in ...
by hippy
Tue Apr 24, 2018 10:54 am
Forum: General discussion
Topic: Are Raspberry Pi and other microcontrollers scalable for commercial projects?
Replies: 13
Views: 416

Re: Are Raspberry Pi and other microcontrollers scalable for commercial projects?

I had a chance to test Samsung SmartThings. It offers different sensors that can be powered by a single battery that lasts for years. I am curious to know what kind of microcontrollers and microchips they're using if the battery lasts that long? They use microcontrollers and other components which ...
by hippy
Tue Apr 24, 2018 9:16 am
Forum: General discussion
Topic: Industrial Reliability for 24/7 Use
Replies: 34
Views: 1078

Re: Industrial Reliability for 24/7 Use

There are 500k lines of code running on the VC4. We find bugs in it quite frequently, although less than we used to. Much more often than we find bugs on the PCB's which is pretty much never. It's not so much quantity or frequency of finding bugs it's more impact. A VC4 bug can be fixed by a softwa...
by hippy
Mon Apr 23, 2018 5:39 pm
Forum: Raspbian
Topic: Under-voltage detected! (0x00050005) ... how to disable?
Replies: 57
Views: 2429

Re: Under-voltage detected! (0x00050005) ... how to disable?

Seem to imply that the peak current during boot is fairly high. Though looking at current drawn, as others have measured it, it doesn't seem that high - power-up.png For the 3B there's an early surge of 300mA there and a couple later of 600mA, and that could be higher with USB devices attached. I a...
by hippy
Mon Apr 23, 2018 4:40 pm
Forum: General discussion
Topic: Industrial Reliability for 24/7 Use
Replies: 34
Views: 1078

Re: Industrial Reliability for 24/7 Use

Interesting that by far the most complicated part of the board is a black box to anyone using it, and yet people get all hung up on the relatively simple PCB design not being available. For me, that's because the circuit design is far more likely to have an issue than a black box SoC. That's possib...
by hippy
Mon Apr 23, 2018 2:30 pm
Forum: General discussion
Topic: Industrial Reliability for 24/7 Use
Replies: 34
Views: 1078

Re: Industrial Reliability for 24/7 Use

Anyway, it's a rare thing for suppliers of industrial gear to provide their schematics and other design info. So this is not a point against the Pi for such applications. True. I was just pointing out that the claim that "The Pi hardware is rock solid" is only true to some degree of "rock solid", h...
by hippy
Mon Apr 23, 2018 2:06 pm
Forum: General discussion
Topic: Industrial Reliability for 24/7 Use
Replies: 34
Views: 1078

Re: Industrial Reliability for 24/7 Use

The Pi hardware is rock solid Possibly, but it hasn't always been so in the past, and arbitrary third parties cannot verify it is these days because full circuit diagrams and electrical specs are not published. The VHDL for the chips on board are not published either......but people are happy to be...

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