Raspberry Pi Forums

Burngate

carbone wrote: ↑
Sun Feb 02, 2020 12:18 am
Forgive me but why spend time soldering pins you don't need when the component is designed to be cut to the length desired?

Because next week or the week after, your goals will have changed, and you'll need more.

Burngate

Back in the day the Foundation were pre-announcing revision changes - https://www.raspberrypi.org/blog/upcoming-board-revision But back then, the Foundation was different, and so was the whole Raspberry Pi scene. The Pi started as a punt in the dark - they had hoped to sell 10,000 - and the idea of...

Burngate

... something bad happening when the pi is turned on. When first turned on, most GPIOs are inputs, some have 50k pull-downs activated, and some pull-ups. A couple (GPIOs 2 & 3) have low-impedance (1k8) external pull-ups. A resistor to ground would keep the transistor off until the GPIO was set to o...

Burngate

Windows of any variety refuses to read a Linux-based file system, so is not much use for backing up your SD card. The best it could do is make an image of the whole card - but that might not be helpful if you need to reimage a fresh card. Better would be to use your Pi - which understands its own fi...

Burngate

I powered my Pi using the USB port. Do you please give me a suggestion about how may i solve this damn problem? Buy a decent PSU - preferably the official one. The USB port on your laptop is very good for what it is, just as the salesman described, but what he didn't tell you is that it isn't good ...

Burngate

... I followed recovery instructions formating empty sdcard and copying recovering files. Does that mean you've read https://www.raspberrypi.org/forums/viewtopic.php?f=28&t=58151 , particularly the fourth post, and followed the instructions to reload the bootrom? If that hasn't brought it back to l...

Burngate

Your other (similar)post implies it's actually a Pi 4 B, and the red LED going off supports this. Whatever, it's almost certainly a power supply problem - the red LED should never go off. What are you using to power your Pi? The Troubleshooting subforum should be your first port of call, with https:...

Burngate

A family member with medical background working on this tells me ... As always, Wikipedia will tell you more than you want to know https://en.wikipedia.org/wiki/Coronavirus Apart from it being an RNA virus, what slightly bemuses me is that, this time round, it hasn't been given a cuddly name like S...

Burngate

As always, we're talking in a vacuum. We don't know how long the supply chain is, or how fast it moves, so if this particular coronavirus (2019-nCoV) stops production, we have no idea when we'll feel the effect. And could Sony take up the slack? Same goes for all the other production lines in the af...

Burngate

Could a metal box fulfill your needs? My personal opinion is that allowing WiFi to scream at neighbourhood is a bad idea, but only putting PoE on boards with WiFi where you don't need it, and not on wired-network-only boards where it could be advantageous seems ... odd. But I won't query it 'cos the...

Burngate

Being a teenager happened a long time ago, for me, but I can still remember bits of it. Part of what I remember is being told to take responsibility for my own actions. Maybe I had extraordinary parents - they let me and my sister get on with our lives, instead of mollycoddling us. So my advice (for...

Burngate

... a python script for 5 tactile push buttons from general GPIO pins (11, 13, 15, 16, 18 pulled high) that all travel through a single 1K resistor. One resistor? Not sure I understand how that could work ... a diagram perhaps? And, of course, the code you're using. On a whim I pulled all the GPIOs...

Burngate

Also I note, you have marked the diagram with "no ground" There needs to be a return path for currents from the GPIOs through the optoisolators, so why have you deliberately not connected the ground? EDIT: I'm talking rubbish here; please ignore me! There doesn't need to be a ground - the GPIO is th...

Burngate

It might also be useful to post details of your 3-pin buzzer

Burngate

You haven't connected the grounds of the two Pis together. The top Pi, supplying the 3v3, "knows" whether its GPIOs are at 3v3 or at ground. The bottom one just sees a floating GPIO, which could be anywhere between its ground and 3v3 (hopefully not outside that range, but you can't be sure) You coul...

Burngate

import RPi.GPIO as GPIO import time import os GPIO.setmode(GPIO.BCM) GPIO.setup(23, GPIO.IN) while True: if GPIO.input(23): os.system("sudo shutdown -h now") prev_input = input time.sleep(0.05) (put that in code tags for you, as the forum removes leading indents) You haven't mentioned any pull-ups....

Burngate

ElEscalador wrote: ↑
Wed Jan 22, 2020 2:40 pm
... My wife likes her Ring..

That's because you gave it to her.

You could perhaps replace yor wife ... but that probably means another Ring

Burngate

It surprises me that no pads were lifted off the board. As drgeoff says, there appears to be enough solder on the pads, but the picture isn't sharp enough to tell whether there's any evidence of the pins having broken away from the solder - cratering of the solder surface - or never having been in c...

Burngate

Wasn't that part of the problem with the original version of the PoE hat? A switch-mode supply has a series inductor, parallel capacitor feeding its output. It can only respond to a changing demand on the next switching cycle, and whilst the coil can keep the current constant between switches, the c...

Burngate

Yeah, I was wrong yet again - L3, C8, and 1V1-DDR.

So how come the Pi keeps working - unless there're other caps on the rail, probably close to the ram chip ...

Burngate

Jury service is something that I do have first hand experience of. Two years ago I was on a Jury for a potential murder trial. After much deliberation we eventually decided on a verdict of manslaughter. It was hard and took two weeks to get to that point. Later I found that the accused had previous...

Burngate

I've not actually bought a 4B yet (I know, I know, I will, one of these days) so this is just going on the various pictures I've found. But 5v goes in on pins 12 & 13, and pins 28 & 29. On that first pic in the first post, you can clealy see those pairs of pins joined together with paralleled caps, ...

Burngate

FAT32 will support partitions larger than 4GB, but Windows prefers to do its own thing. NTFS isn't supported out-of-the-box by Raspbian, so trying to use that could be difficult. As Maze_fr says, install an image on your card using BalenaEtcher, rather than trying to use Noobs (others might disagree...

Burngate

Companies may decide to employ me or not. Depending on what their algorithms tell them about me. That's been going on since time immemorial. They were just using their own inbuilt biases instead of the ones built into their algorithms. I was offered an interview for a job near London, that happened...

Burngate

Don't want to start an argument, here, but the question was "Can I use transistors". A single FET is a transistor, though a couple of resistors are also needed! A 74HCT125 also contains transistors, of course, so fits the bill, but just seems rather overkill for this job. Otherwise, you're absolutel...

Search found 6285 matches

Re: Soldering Pins

Re: New Pi 4B v1.2?

Re: Controlling LED strip using NPN transistor, resistor from gpio to ground?

Re: SD card. Backup issue

Re: Raspberry Pi 1 B booting Problem.

Re: Pi4 not boot and cannot recover bootloader

Re: Raspberry Pi 1 B booting Problem.

Re: Current news vs Pi production

Re: Current news vs Pi production

Re: Wifi Antenna

Re: Kids are getting smarter

Re: Continual Tilde (~)

Re: DHT11 with 8 Channel Relay, need help with circuit

Re: buzzer 3 Pins

Re: Control multiple Raspberry Pi with one button (GPIO)

Re: GPIO help

Re: Intercept Ring Doorbell images ?

Re: USB C power port fell off

Re: RPi3 official PSU solved my problems. But why?

Re: Raspberry pi 4 get really hot

Re: algorithms and ethics at the Barbershop

Re: Raspberry pi 4 get really hot

Re: Raspberry Pi 4B, problem with the SD card

Re: algorithms and ethics at the Barbershop

Re: Glitchy WS2812B LEDs