Raspberry Pi Forums

davidcoton

That's the thing. We lived in a few different places around England. And of course visited hundreds more. I don't recall anyone heating their homes with such smelly Aladdin heaters. Obviously you never visited our family home before central heating was installed (late 60s?). blowing heated air thro...

davidcoton

My electric car charger (7kW) was fitted without any changes to the supply. That is quite normal IF you have an adequate supply (not everyone does). There are some tricky regulations about RCD protection and earthing (cannot use incoming PME earth), so many outdoor car charger installations will ne...

davidcoton

..... USA 220V is used by having two phases at 180°, effectively (and possibly implemented as) a 220V centre-tapped system. AIUI high power appliances use the two sides line to line (220V), while the standard US socket uses one side to what we would call neutral (a near ground centre tap). Most dwe...

davidcoton

Well, the "point" revision of the Pi2B when it went from 16-bit to 32-bit definitely was announced. Say what? The Pi2Bv1.1 uses 32-bit cores. The Pi2Bv1.2 uses the same 64-bit capable cores that the Pi3B used. The point was to drop the production of the BCM2836. And--at the time--there wasn't any a...

davidcoton

[off-topic] I'm expecting to get my EV charger connected to the existing single phase giving me a 7KW charger. https://rightcharge.co.uk/guides/how-to-charge-an-electric-car The car is due for delivery next month (May 2020) some time in the future. Yes, single phase may be adequate. Unless you alrea...

davidcoton

May be missing something but I don't see where line voltage is relevant. We are talking about coil to contacts breakdown. Personally tested with professional gear to be IIRC at least 2500v. That was for Tongling brand which cross to the Songle clones in OP. BTW little known fact: USA also uses 220v...

davidcoton

As I indicated, there are two different design approaches (theoretical/experimental). The key to good engineering is to know when to use each. The key to brilliant engineering is to use the fastest method, and produce a result that cannot be improved by the other approach. To get beyond mediocre eng...

davidcoton

We've been releasing new version of Pi boards without announcement for years, and no-one has noticed. ... It's a bit like changing memory chip suppliers - we did that a lot in the early days, each memory chip change required new firmware. No-one noticed. Well, the "point" revision of the Pi2B when ...

davidcoton

If you need a full 1.2A supply from USB (and/or GPIO) for HDD and other peripherals, the 2.5A supply will not be enough. The 4.2A supply should be plenty in any case. As long as the supply capacity is equal to or greater than what you are actually using, there should be no problem. The big "gotcha" ...

davidcoton

There are 2 revision PDFs recent one is Dec 2019 !!! BCM2837 package change BCM2837 package change (2) And to quote from the second one: This PCN just adds Made in Japan to the previously issued PCN (RPI-PCN-Pi3B-001) issued in November 2018 which covered this change. IMHO, that is what gives PCNs ...

davidcoton

what is the usable space inside, length, width, height, 210mm H x131mm W x46mm D (above fitted base plate, into lid space). Ask if you need more. BTW it comes with wall and mast mounts. 1% or so of my ramblings have proved useful to someone, somewhere. Probably optimistic :o :shock: :? :cry: :roll:...

davidcoton

I have the box, yet to put it to use (haven't started that project yet). It looks pretty good, metal so no use for WiFi (which was one thing I did want to try). I have seen IP67 cases with a plug incorporating a membrane with enough flexibility to allow for pressure differences. Can't say whether th...

davidcoton

'dist-upgrade' has a reason. It does indeed, but maybe not what you think. It's nothing to do with upgrades between major versions, just with auto-upgrading dependencies. That's why the new recommended equivalent (for command line use, not scripts) has been renamed. The normal update/upgrade should...

davidcoton

What are you using to supply power? (if not the RPI official supply, include the voltage and current rating.)
Is anything else (apart from keyboard and mouse) connected to USB or GPIO?

Can you try a different keyboard?

davidcoton

"Display power" is not the same as "Display blanking". IIRC you cannot actually turn off the power to the DSI display (or if you can, it won't reconnect when you turn it back on). I think it may be different with HDMI displays. Or, of course, I may just be completely wrong.

davidcoton

In addition to what dickon says, if you really mean that you put the power supply to the two devices in series, then: You can't divide the voltage equally between two devices unless both need exactly the same current at each moment. (A Pi and a Nano won't) Even if you could, you couldn't easily sign...

davidcoton

Cancelor wrote: ↑
Sat Apr 25, 2020 10:53 am
As an alternative and another source of information there is https://foldingathome.org/ installed via a .deb file.

But Folding@home does NOT run on a Pi. I have seen one report of the remote monitoring program of F@h running on a Pi, watching the Big Boys play.

EDIT: typo

davidcoton

THEORETICAL APPROACH Find the spec, find the forward voltage (V f ) and maximum current (I fMAX ), calculate as plugwash says aiming for quarter to half maximum current. EXPERIMENTAL APPROACH Start with a 1K resistor, adjust for required brightness. In both cases note the caveat about V f close to ...

davidcoton

Auto-updated to latest Stable with no problems, no other issues so far but the Pi is not heavily used at present.

davidcoton

You need to test the internal network speed, not the Internet speed. See the many threads on this subject.

davidcoton

Why does the number of wires matter? cat5 wires should work just fine on gigabit hardware, only restricted to 100base-TX speeds Cat5, Cat5e, Cat6, Cat6a and Cat7 relate to the cable characteristic and crosstalk, not to the number of pairs. Cat5 is not guaranteed at GB speed, but may well work espec...

davidcoton

W. H. Heydt wrote: ↑
Thu Apr 23, 2020 12:37 am
(I wish I lived in Theory...everything *works* in Theory.)

Does Theory account for the behaviour of gyroscopes yet?

Or the missing mass of the universe? Dark Matter Identified

davidcoton

Do you have powered peripherals connected? Have you tried without them?

davidcoton

There is no analogue input capability anywhere on any model of RPi released to date. [pedant] Apart from the PMIC analogue inputs on a Pi4B (one of two used for checking the pesky USB-C config resistors at the far end of the link -- but maybe not on a v1.2. Or maybe both are used.). The Pi3B+ has t...

davidcoton

The Pi3B does not have an EEPROM. That (and the support programs/downloads that go with it) belong to the Pi4B.

Search found 5008 matches

Re: vcgencmd uses an APOSTROPHE to indicate temperature

Re: How to control relays in safe way (isolated) ?

Re: How to control relays in safe way (isolated) ?

Re: Is out there a new version of Raspberry Pi 3B?

Re: How to control relays in safe way (isolated) ?

Re: How to control relays in safe way (isolated) ?

Re: LEDs and resistors

Re: Is out there a new version of Raspberry Pi 3B?

Re: Maximum Current Raspi 4B

Re: Is out there a new version of Raspberry Pi 3B?

Re: Anyone have the Nebra Waterproof Enclosure from pi-supply?

Re: Anyone have the Nebra Waterproof Enclosure from pi-supply?

Re: Upgraded from jessie to stretch, can I now upgrade to Buster ?

Re: Keyboard issue

Re: How to detect if display is on or off

Re: Power Raspberry Pi 4 and Arduino Nano via 120v AC power converter

Re: Get your Pi to fight COVID-19

Re: LEDs and resistors

Re: Update to default Pi4 bootloader

Re: Raspberry Pi 4 4GB weak ethernet port?

Re: Raspberry Pi 4 4GB weak ethernet port?

Re: Python 2 EoL...at least in theory

Re: Raspberry Pi 4 doesn't boot after shutdown unless I wait

Re: Reversing Audio Jack

Re: RPI 3B not booting