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by davidcoton
Tue Jan 16, 2018 10:35 pm
Forum: General discussion
Topic: Failing USB hard drive
Replies: 37
Views: 651

Re: Failing USB hard drive

Heater wrote:
Tue Jan 16, 2018 9:30 pm
I have to say, I'm amazed.

"Later", I would not be wasting any time in this situation...
I'm not surprised that @Heater does not approve of freezing drives :lol:
by davidcoton
Mon Jan 15, 2018 9:59 pm
Forum: Beginners
Topic: upgrade stretch error
Replies: 4
Views: 116

Re: upgrade stretch error

viewtopic.php?f=28&t=202523
Read the whole topic before doing anything.
by davidcoton
Mon Jan 15, 2018 9:42 pm
Forum: Troubleshooting
Topic: NEED HELP! COMBINING ULTRASONIC SENSOR AND LED DIODE
Replies: 7
Views: 129

Re: NEED HELP! COMBINING ULTRASONIC SENSOR AND LED DIODE

School assignment?

How far have you got? Is the problem hardware or software?
HARDWARE: Upload a picture of you setup to a hosting site and link here. Post a schematic.
SOFTWARE: Post your code so far and explain in more detail what is not working.
by davidcoton
Mon Jan 15, 2018 9:34 pm
Forum: General discussion
Topic: How to change 32 bit packages to default architecture on a raspberry pi 3
Replies: 21
Views: 635

Re: How to change 32 bit packages to default architecture on a raspberry pi 3

Luigi3711 wrote:
Mon Jan 15, 2018 9:32 pm
I am still having the same problem. It has something to do with a java plugin and armhf.
You had more than one problem. The above should have solved one of them. Sorry I can't help with the rest.
by davidcoton
Mon Jan 15, 2018 9:32 pm
Forum: General discussion
Topic: Failing USB hard drive
Replies: 37
Views: 651

Re: Failing USB hard drive

I think I've only done it once. I think I tapped from the circumference towards the axis, as the casing looked strongest that way. I may have mis-remembered. My plan may be theoretically flawed. That's why I put it in the "Last Resort, nothing to lose" category.
by davidcoton
Mon Jan 15, 2018 9:28 pm
Forum: Beginners
Topic: Internal pull up/down function explanation
Replies: 12
Views: 231

Re: Internal pull up/down function explanation

Another way to look at the pull up / down is to consider the output in a default state. When a pull up is used there is a 1 'felt' at the output when the input is not being used and when the pull down is used there is a 0 'felt at the output when the input is not being used. If 'something' is conne...
by davidcoton
Mon Jan 15, 2018 9:11 pm
Forum: General discussion
Topic: Failing USB hard drive
Replies: 37
Views: 651

Re: Failing USB hard drive

The other possible temporary fix when there is nothing to lose is a sharp tap with the handle of a medium sized screwdriver. Sometimes it can unstick things.
Note my use of the word temporary.
by davidcoton
Mon Jan 15, 2018 4:50 pm
Forum: Beginners
Topic: Internal pull up/down function explanation
Replies: 12
Views: 231

Re: Internal pull up/down function explanation

so if we look at the 2 circuits they are the same its just that the 10K pull down resistor is internal on the pi ( actually 50K on pi) Umfortunately, that is not quite true. You can implement an EXTERNAL pull-down like that, but the INTERNAL 50K pull-down is, well, internal -- on the other side of ...
by davidcoton
Mon Jan 15, 2018 2:39 pm
Forum: Troubleshooting
Topic: Pi Zero / WaveShare Display / Won't boot, odd colors
Replies: 4
Views: 101

Re: Pi Zero / WaveShare Display / Won't boot, odd colors

EDIT: could a mod close this thread, whatever the forum method is for that? Mods don't close threads, they only Lock them. and for that someone has to do Something Slightly Bad (TM). You can add a "[SOLVED]" tag to the title of your OP juist by going back to it and clicking the edit button (Pen ico...
by davidcoton
Mon Jan 15, 2018 2:27 pm
Forum: Beginners
Topic: In which order does a Python Program run
Replies: 18
Views: 445

Re: In which order does a Python Program run

That makes sense what you say about Def statements because the program must put some sort of flag against them to know that they exist and where to find them. Yes that is the effect. The "Def" is executed to the extent of labelling its contents and making then available when the routine is called. ...
by davidcoton
Mon Jan 15, 2018 2:13 pm
Forum: Beginners
Topic: Internal pull up/down function explanation
Replies: 12
Views: 231

Re: Internal pull up/down function explanation

The pull-ups don't "supply voltage" - they merely connect a high-value resistor (about 50k) between the 3v3 rail and the GPIO If nothing else is connected to it, that resistor supplies enough electrons - current for a certain time - to the GPIO, such that its voltage rises to 3v3. A pull-down works...
by davidcoton
Sun Jan 14, 2018 11:37 pm
Forum: Troubleshooting
Topic: [SOLVED] python-scrollphathd upgrade problem
Replies: 13
Views: 1218

Re: python-scrollphathd upgrade problem

DougieLawson wrote: No idea why we need that package in a standard Raspbian install since it's for special hardware.
Two possible reasons:
  1. Mistake :o :shock: :?
  2. Preparation for h/w built in to imminent Pi4B :twisted:
by davidcoton
Sun Jan 14, 2018 12:51 pm
Forum: Beginners
Topic: accessing LAN NAS by name not IP Address
Replies: 20
Views: 297

Re: accessing LAN NAS by name not IP Address

Hi that’s interesting i had always assumed it was better to have non-static to be flexible thanks for that. It's better NOT to define a static address on each PC, NAS, or printer itself. That results in making equipment difficult to move between networks. However many DHCP servers (usually part of ...
by davidcoton
Sun Jan 14, 2018 12:41 pm
Forum: Beginners
Topic: In which order does a Python Program run
Replies: 18
Views: 445

Re: In which order does a Python Program run

I found the initial query about order of execution confusing because, in almost any language, the answer is that the program runs from the top to the bottom. I'm afraid that is just not true, although some languages may conventionally be laid out that way. You need to identify the entry point. In C...
by davidcoton
Sun Jan 14, 2018 12:08 am
Forum: Beginners
Topic: In which order does a Python Program run
Replies: 18
Views: 445

Re: In which order does a Python Program run

At the risk of causing further confusion... a mini-introduction to classes. A Class is a collection of data (properties) and behaviours (procedures) that often relate to a type of (physical) object. For example, Class "Car" might have properties like Colour, FuelType, EngineCapacity, TopSpeed. It mi...
by davidcoton
Sat Jan 13, 2018 10:49 am
Forum: Beginners
Topic: Suggestion on HAT design
Replies: 6
Views: 170

Re: Suggestion on HAT design

Problem is, if that were part of the HAT spec, people would expect HATs to be stackable. In fact, boards built to the HAT spec are specifically NOT stackable (because of the EEPROM interface). I have an Adafruit TFT board with a pass-through connector, which works for me. This particular board does ...
by davidcoton
Sat Jan 13, 2018 10:37 am
Forum: General discussion
Topic: Is it possible to run a R Pi on 3.7Volt?
Replies: 19
Views: 646

Re: Is it possible to run a R Pi on 3.7Volt?

... Can either of you, please point me to information from the Rasberry Pi foundation saying it's OK to run a unit by connecting power directly to the output of the on board 3.3V power supply... I can't. Personally I do such tests by powering via the 5V pin (with voltages in the range I indicated)....
by davidcoton
Fri Jan 12, 2018 9:37 pm
Forum: Troubleshooting
Topic: Can't get GPIO (or 5V pin) functioning [solved]
Replies: 12
Views: 233

Re: Can't get GPIO (or 5V pin) functioning

@alphanumeric is right. Swapping the two rows is a consequence of using a female header instead of a male one. To work out with the standard connections, female headers need to be soldered to the other side of the board. Just watch out in case that swaps pin 1 to the wrong end of the board when the ...
by davidcoton
Fri Jan 12, 2018 9:17 pm
Forum: Troubleshooting
Topic: Raspberry PI Configuration gui fail after set access point wifi
Replies: 3
Views: 84

Re: Raspberry PI Configuration gui fail after set access point wifi

Don't use rpi-update unless you know what you are doing, or someone else who does know recommends it. Rpi-update introduces experimental releases of software that may break things in interesting ways.
Meanwhile, as @SurferTim says, it's time to start over.
by davidcoton
Fri Jan 12, 2018 9:14 pm
Forum: Troubleshooting
Topic: HDMI Ground Interference
Replies: 3
Views: 87

Re: HDMI Ground Interference

What voltage are you reading from the PSU, and where? It sounds as if you are trying to read a voltage reference to mains ground, rather than output 0V. Most switching supplies have an isolated output (not referenced to mains ground). When you connect your HDMI monitor, it is referencing the 0V rail...
by davidcoton
Fri Jan 12, 2018 7:05 pm
Forum: General discussion
Topic: New to Pi3/ wifi spd?
Replies: 7
Views: 266

Re: New to Pi3/ wifi spd?

Looked at the USB connections I was using. the one from apple is 1A. The one from Motorola is .780mA. So ordered a 2.5A will get that tomorrow. 1A is not enough for a Pi3B. Is the red LED supposed to flash or stay steady? Not sure if it is part of my PS problem, or just does that. The red LED shoul...
by davidcoton
Fri Jan 12, 2018 7:02 pm
Forum: General discussion
Topic: Is it possible to run a R Pi on 3.7Volt?
Replies: 19
Views: 646

Re: Is it possible to run a R Pi on 3.7Volt?

Since the desingers have even included pop-up warning icons when the 5V line is too low I assume you need to stay within the specified range for reliable operation. In the absence of other information that is a good assumption. But there is other information. Notably the power used on board is regu...
by davidcoton
Thu Jan 11, 2018 11:29 pm
Forum: General discussion
Topic: Is it possible to run a R Pi on 3.7Volt?
Replies: 19
Views: 646

Re: Is it possible to run a R Pi on 3.7Volt?

Yes the Pi can send Bluetooth audio to speakers (with an audio amp), it can't (by itself) take a mic input to send back to the phone.
by davidcoton
Thu Jan 11, 2018 11:19 pm
Forum: General discussion
Topic: Is it possible to run a R Pi on 3.7Volt?
Replies: 19
Views: 646

Re: Is it possible to run a R Pi on 3.7Volt?

Yes.

However it may not help you, because the Pi has no built-in audio input. So you would need something to input the sound -- probably a USB dongle. Needing 5V.

Another thought. Your flip-handset could be great your answering calls, but how do you make a call?

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