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by Burngate
Sat Oct 13, 2018 5:04 pm
Forum: Raspbian
Topic: [Unofficial announcement] Raspbian - October 2018 version
Replies: 17
Views: 862

Re: [Unofficial announcement] Raspbian - October 2018 version

It's not how much rain we get as when.

It's fine and sunny, so I wash the bedding. The wash cycle finishes, and the rain starts.

This morning my neighbour (in the other half of our semi) took his roof off. It promptly started to rain, with the wind blowing it straight into our loft.
by Burngate
Fri Oct 12, 2018 8:05 am
Forum: General discussion
Topic: can I hook up my pi to two Different monitors?
Replies: 7
Views: 237

Re: New to pi

Depending on what needs finishing at home, why not buy yourself a second Pi for home, and just move the SD between the two?
by Burngate
Thu Oct 11, 2018 6:08 pm
Forum: Troubleshooting
Topic: 2 Raspberry Pi 3 B+ gone(?)
Replies: 8
Views: 188

Re: 2 Raspberry Pi 3 B+ gone(?)

I'd say so, yes.

There have been some Pis that died for no apparent reason, but with two dying in a short time, it's likely that something you did was the cause.
So before killing some more, it might be worth while reviewing what you were doing when they died.
by Burngate
Thu Oct 11, 2018 6:04 pm
Forum: Troubleshooting
Topic: only red light on, help.
Replies: 12
Views: 189

Re: only red light on, help.

R72 is only the current limitting resistor for the LED itself.

The regulator chip - sometimes refered to as power management IC, PMIC - is that big block labeled U8.
It's a very sophisticated chip, more-or-less designed for the P1, with lots of legs so it wouldn't be easy to change it.
by Burngate
Thu Oct 11, 2018 5:52 pm
Forum: Troubleshooting
Topic: 2 Raspberry Pi 3 B+ gone(?)
Replies: 8
Views: 188

Re: 2 Raspberry Pi 3 B+ gone(?)

First port of call, if you have a multimeter, is to measure the voltage on pin 1, relative to gnd (the metalwork on a connector is best) If it measures 0, the power management chip has probably died, perhaps because of something you did. If it's measuring 3v3, you've broken something else. One of th...
by Burngate
Thu Oct 11, 2018 5:25 pm
Forum: Troubleshooting
Topic: PI 3B+ not booting. Act led not blinking
Replies: 25
Views: 1876

Re: PI 3B+ not booting. Act led not blinking

Sure - as I understand it, "a very small number" have turned up their toes without provocation, and possibly a larger number have had their toes curled by maltreatment. I have no information regarding the numbers, or the number working perfectly well (other than it's greater than one - mine) I'm not...
by Burngate
Thu Oct 11, 2018 7:59 am
Forum: Troubleshooting
Topic: PI 3B+ not booting. Act led not blinking
Replies: 25
Views: 1876

Re: PI 3B+ not booting. Act led not blinking

gkaiseril wrote:
Wed Oct 10, 2018 2:59 pm
It is possible that you have tripped or blown the poly fuse that protects the Pi.
If the poly-fuse had tripped, there wouldn't be 5v at pin 2; nor would the pwr LED light.

5v at pin 2 and 0v at pin 1 = blown pmic
by Burngate
Wed Oct 10, 2018 7:23 am
Forum: Beginners
Topic: Raspberry Pi Model 3B+ can not boot
Replies: 8
Views: 209

Re: Raspberry Pi Model 3B+ can not boot

Pretty much no.

One chip does the 5v to 3v3 & other rails, and that's what dies.
There has been someone who successfully replaced the chip, but unless you're good at soldering surface-mount, ...
by Burngate
Tue Oct 09, 2018 8:48 am
Forum: General discussion
Topic: Pi Zero W has no pullups on I2C pins, but the Zero does?
Replies: 10
Views: 453

Re: Pi Zero W has no pullups on I2C pins, but the Zero does?

Given that the GPIO pads can handle up to 16mA, even with 1k8 pull-ups already there, you could add your own pull-ups down to 240Ω without breaking anything. Assuming a maximum of 8mA, that rises to 510Ω While it would be nice to have full schematics of all the Pi range, we're unlikely to get them -...
by Burngate
Mon Oct 08, 2018 8:44 am
Forum: Beginners
Topic: Raspberry Pi Model 3B+ can not boot
Replies: 8
Views: 209

Re: Raspberry Pi Model 3B+ can not boot

So ... that's two more in the last few days with dead pmics ...
by Burngate
Sun Oct 07, 2018 8:48 am
Forum: Troubleshooting
Topic: Solved: Raspberry pi 3 b+ will not boot.
Replies: 22
Views: 396

Re: My Raspberry pi 3 b+ will not boot. help needed

Whether or not that PSU couldpower a 3B+ at full tilt is beside the point - it doesn't appear to be booting, and since most of the Pi apart from the USB runs on 3v3, generated by U8, it should at least try to boot. So back to my main point. ml4wZ6k crop.jpg If that's pin 1, it's way over the top. 5v...
by Burngate
Sun Oct 07, 2018 8:25 am
Forum: Off topic discussion
Topic: R Pi in main-stream periodicals
Replies: 9
Views: 831

Re: R Pi in main-stream periodicals

... "mass circulation" ... "mass market" ... the awareness of the general population. Exactly what I was trying to say. Thank you for putting it more succinctly than I managed. And, yes, I'm disappointed that up till now it's been ignored by even those publications such as New Scientist that are su...
by Burngate
Sat Oct 06, 2018 5:53 pm
Forum: Off topic discussion
Topic: R Pi in main-stream periodicals
Replies: 9
Views: 831

Re: R Pi in main-stream periodicals

The other 7 billion can do what they want - Humpty Dumpty is my hero here. "When I use a word," Humpty Dumpty said, in rather a scornful tone, "it means just what I choose it to mean — neither more nor less." Apparently, the French are not going to be allowed to use the phrase "Fake news". I hope we...
by Burngate
Sat Oct 06, 2018 5:46 pm
Forum: Troubleshooting
Topic: Solved: Raspberry pi 3 b+ will not boot.
Replies: 22
Views: 396

Re: My Raspberry pi 3 b+ will not boot. help needed

... Plugged in the power, and...... Nothing... just a red led. no blinking, not green led, nothing on the screen. Nothing. The Red led indicates that the Pi can't read the SD card and therefore will not load/boot. there is nothing wrong with the software or SD cards. I assume you mean the non-blink...
by Burngate
Sat Oct 06, 2018 5:22 pm
Forum: Off topic discussion
Topic: R Pi in main-stream periodicals
Replies: 9
Views: 831

Re: R Pi in main-stream periodicals

My definition of main-stream would be newspapers and monthlies that I read - so New Scientist qualifies, as does the Telegraph, but not Nature and not the Sun. Make of that what you will. Not that it's a question as such - more an observation that others might find interesting / controversial, perha...
by Burngate
Sat Oct 06, 2018 11:51 am
Forum: Off topic discussion
Topic: R Pi in main-stream periodicals
Replies: 9
Views: 831

R Pi in main-stream periodicals

This is the first time I've seen Pis mentioned in main-stream news papers or periodicals. New Scientist, 6 Oct 2018 p. 10, an article about monitoring Borneo's rain forests. Sarab Sethi of Imperial College et al. are using 12 Pis powered by solar panels to capture sound, video, etc. If Pis have been...
by Burngate
Thu Oct 04, 2018 8:15 am
Forum: Troubleshooting
Topic: No HDMI Signal after changing power delivery method
Replies: 11
Views: 248

Re: No HDMI Signal after changing power delivery method

Code: Select all

PC's USB ---> Pi ---> Monitor    OK
 Brick   ---> Pi ---> Monitor  not OK
 Brick   ---> Pi --->  TV        OK
Does the Pi's red LED still light with the suspect brick?
by Burngate
Tue Oct 02, 2018 5:16 pm
Forum: General discussion
Topic: GPIO to measure amps in a wire
Replies: 9
Views: 236

Re: GPIO to measure amps in a wire

A Pi's GPIOs are all digital; the output of a split-core current transformer such as this is analogue, so you'll need an ADC in between it and the Pi Have you used such a ct before? They must be connected to a resistor to get a meaningful output. I'm sure there must be plenty of posts here and elsew...
by Burngate
Mon Oct 01, 2018 9:51 am
Forum: General discussion
Topic: New glossary
Replies: 30
Views: 636

Re: New glossary

... and also any thought on where it should be linked from. At the moment there is just the one link on the top docs page, and I think it's a bit too hidden. I'd move it up a level to the "Help" tab, since it's more to do with generally Helping people than than just with the docs (I'd also be wanti...
by Burngate
Sun Sep 30, 2018 7:52 am
Forum: Troubleshooting
Topic: Raspberry Pi 1 Model A capacitor replacement
Replies: 7
Views: 228

Re: Raspberry Pi 1 Model A capacitor replacement

You may be interested to know it's a model B version 1.0. Aside from having (C) 2011 printed on it, near the USB sockets are two polyfuses, F1 & F2, which were removed in later versions. The model A had only one USB socket, and was missing the USB chip. Who knows, being such an early version of whic...
by Burngate
Sat Sep 29, 2018 8:42 am
Forum: For sale
Topic: A Raspberry Pi2b + Decent Monitor for 85€ or...
Replies: 2
Views: 129

Re: A Raspberry Pi2b + Decent Monitor for 85€ or...

Looking at my Pis, the clue appears to be the silkscreen - my Pi 2B has "Raspberry Pi 2 Model B V1.1" written on it, while the 3B has "Raspberry Pi 3 Model B V1.2"
by Burngate
Fri Sep 28, 2018 5:27 pm
Forum: Off topic discussion
Topic: Add Analog to Digital pins to the pi
Replies: 3
Views: 679

Re: Add Analog to Digital pins to the pi

Also, whilst "lots" of people may want ADCs, their needs vary.
Does everyone want 24-bit resolution? How about speed - 44kHz for audio, rather less for blood pressure.
by Burngate
Fri Sep 28, 2018 5:12 pm
Forum: Automation, sensing and robotics
Topic: RPI Analog In and Out
Replies: 6
Views: 386

Re: RPI Analog In and Out

Ok, I see what you want - and no, a simple comparator wouldn't work. It could be used for the phase, but not the amplitude. For that, an ADC is required, though you could possibly have an analogue peak-detection circuit, before the ADC, so you won't have to read it quite so often. Otherwise, you're ...
by Burngate
Fri Sep 28, 2018 8:43 am
Forum: Automation, sensing and robotics
Topic: RPI Analog In and Out
Replies: 6
Views: 386

Re: RPI Analog In and Out

On the output side, you're happy, but for the input, do you really need to know they're really nice undistorted sine waves? What are you wanting to do if, say, there's 10% second harmonic distortion on one of them? Could you just detect / measure when they go from positive to negative and vice versa...
by Burngate
Fri Sep 28, 2018 8:16 am
Forum: Off topic discussion
Topic: Speaker Wattage and Resistance Questions
Replies: 14
Views: 1064

Re: Speaker Wattage and Resistance Questions

Amplifiers, like a lot of things, are voltage sources - they attempt to give a constant voltage whatever the load, up until too much current kills something. It might be worth your while learning about Ohm's law - that's about volts, amps and resistance and how they relate to each other. Also, how v...

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