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by Burngate
Thu Apr 26, 2018 8:58 am
Forum: Troubleshooting
Topic: Problems with the Pi
Replies: 1
Views: 25

Re: Problems with the Pi

MrQuestionsGuy wrote:
Wed Apr 25, 2018 5:16 pm
... The power/CPU monitor LED flashs, then holds for 2 seconds then stays off.
Do you mean the red LED on the Pi?
If so, it means your power supply isn't good enough. Get a proper one.

In any case, read viewtopic.php?f=28&t=58151
by Burngate
Wed Apr 25, 2018 9:28 am
Forum: General discussion
Topic: Industrial Reliability for 24/7 Use
Replies: 34
Views: 1057

Re: Industrial Reliability for 24/7 Use

IMHO the only real design error i can remember was the connection of the two 1V8 lines together in the very first PI that caused the overheating of the LAN9512 chip,. Was it a "design error" that had the USB socket overhanging the edge of the board? Electronically of no consequence, but aesthetical...
by Burngate
Wed Apr 25, 2018 9:08 am
Forum: General discussion
Topic: Cat 5 for 5V and Ground
Replies: 6
Views: 227

Re: Cat 5 for 5V and Ground

According to https://en.wikipedia.org/wiki/Category_5_cable Cat 5e UTP cable uses 24AWG wire, and should be better than 0.094 Ω/m. Ohm's law will tell you how much voltage drop you can expect in your situation (not forgetting that all the individual currents will return through the ground wire) but ...
by Burngate
Tue Apr 24, 2018 5:32 pm
Forum: Troubleshooting
Topic: Did I destroy my raspberry?
Replies: 5
Views: 233

Re: Did I destroy my raspberry?

A few questions to ask ...
How did you short-circuit between 5v & ground - as in: drop a screwdriver on the header? (my own second-favourite, with pouring coffee over it being favourite)

Does the big chip get hot very quickly?

If you have a meter, is there still 3v3 on pin 1?
by Burngate
Mon Apr 23, 2018 6:48 am
Forum: General discussion
Topic: UPS for a Pi
Replies: 10
Views: 514

Re: UPS for a Pi

Hmm ... you'd have thought, at my age, I'd have learned to not jump in with both feet, before reading beyond the first page.

Mea culpa. Sorry.
by Burngate
Sun Apr 22, 2018 10:16 am
Forum: General discussion
Topic: UPS for a Pi
Replies: 10
Views: 514

Re: UPS for a Pi

I agree about omitting D1 ... Aha! No, I'm going to revoke my agreement now. ... it creates a path for current to flow from the battery to the UBEC - through R1. In my original circuit, that's blocked by D1. If you have that flow, there's potential for a moderate drain on the battery - the UBEC sti...
by Burngate
Sat Apr 21, 2018 11:39 am
Forum: Beginners
Topic: How can I tell if I'm powering my motors through the battery or the RPi?
Replies: 8
Views: 193

Re: How can I tell if I'm powering my motors through the battery or the RPi?

Ill add them once I get a chance. But in the meantime, assuming my wiring is correct. If I disconnect the battery pack, will the rpi attempt to power the DC motors itself from the 5v output? According to the datasheet in front of me, VCC2 (pin 8, supplying the output circuit) shouldn't be lower tha...
by Burngate
Wed Apr 18, 2018 5:52 pm
Forum: Graphics, sound and multimedia
Topic: Which Amplifier Board to use with Raspberry pi and outdoor
Replies: 3
Views: 125

Re: Which Amplifier Board to use with Raspberry pi and outdoor

The power delivered to the speakers depends on the power supplied to the amp. Obvious, it may seem, but not always taken into account. On the output side of an amp - any of them, really, but definitely with class D - is a switch. In the case of these three, that switch can do two things: connect one...
by Burngate
Wed Apr 18, 2018 5:28 pm
Forum: Raspbian
Topic: Under-voltage detected! (0x00050005) ... how to disable?
Replies: 57
Views: 2367

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

The SoC itself also uses 5V directly For the Pi 3B+ is the SoC using the incoming 5V supply or is it using a 5V generated by the PMIC chip ? The chip has 5 outputs, four buck and one LDO linear, none of them 5v. Not terribly surprising - 5v out from possibly less than 5v in would require boost, so ...
by Burngate
Wed Apr 18, 2018 10:05 am
Forum: Beginners
Topic: Beginners Error = Destroyed Micro SD
Replies: 6
Views: 241

Re: Beginners Error = Destroyed Micro SD

Roken wrote:
Tue Apr 17, 2018 7:07 pm
... Fortunately, after you do it once, you won't do it again.
Who says I haven't?
by Burngate
Wed Apr 18, 2018 10:03 am
Forum: Off topic discussion
Topic: Questions related(non) to Raspberry PI
Replies: 13
Views: 2933

Re: Questions related(non) to Raspberry PI

1) Fluke 8020 from decades ago and still good. It cost alot, new, but I didn't pay for it - my employers gave it to me. I wouldn't pay more than a tenner! As bensimmo says, the leads are important - and also what lets you down, so be prepared to buy several sets. 2) When I started out tele-mending i...
by Burngate
Wed Apr 18, 2018 9:10 am
Forum: Raspbian
Topic: Under-voltage detected! (0x00050005) ... how to disable?
Replies: 57
Views: 2367

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

I should have kept quiet, but now I've joined in, I'll have to carry on. There appears to be two different scenarios being discussed, here in this thread, which maybe should be separated. The first is what the Pi was invented for - the beginner just setting out gets a Pi, plugs it into a monitor, pl...
by Burngate
Tue Apr 17, 2018 6:03 pm
Forum: Troubleshooting
Topic: Did I destroy my raspberry?
Replies: 5
Views: 233

Re: Did I destroy my raspberry?

The power through the USB socket goes fairly directly to the 5v and ground header pins, with only a fuse in the way, so no major electronics should be damaged.
And, since you still have the red LED glowing, it would seem the fuse survived as well (it should in any case heal itself with time)
by Burngate
Tue Apr 17, 2018 5:54 pm
Forum: Raspbian
Topic: Under-voltage detected! (0x00050005) ... how to disable?
Replies: 57
Views: 2367

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

I've been watching this thread with interest. According to the front page a week ago (11 April) the Pi 3+ comes with a new power chip - MXL7704. The pdf for this chip says minimum input is 4.0v So the Pi is perfectly happy with >4.0v, even though USB spec says >4.4v, and the alarm goes off at betwee...
by Burngate
Tue Apr 17, 2018 4:59 pm
Forum: Automation, sensing and robotics
Topic: Rpi and relay to switch on/off lights
Replies: 27
Views: 73428

Re: Rpi and relay to switch on/off lights

Before I was allowed to join Thames TV I had to take a colour-blindness test. They weren't worried about my life - it was their pictures they were considering. I passed, but I still managed to ruin some perfectly good pictures. Marconi, in their Mk 7 camera, used pink for everything. They must have ...
by Burngate
Tue Apr 17, 2018 10:25 am
Forum: Automation, sensing and robotics
Topic: Rpi and relay to switch on/off lights
Replies: 27
Views: 73428

Re: Rpi and relay to switch on/off lights

Apart from agreeing with Dougie, in the US, apparently, Live is Black with Neutral White. So he almost got half of it right. https://www.allaboutcircuits.com/textbook/reference/chpt-2/wiring-color-codes-infographic/ It's worth noting that Red for Live & Green Earth isn't such a good idea since those...
by Burngate
Tue Apr 17, 2018 9:37 am
Forum: General discussion
Topic: GPIO Pin Layout
Replies: 5
Views: 269

Re: GPIO Pin Layout

Putting in my ha'peth ... You'll have to ask Dr. Upton CBE for the details, but he seems to have chosen the GPIO-to-pin order in part to ease the board layout from underneath the chip to the board edge. A different ordering could have required extra board layers, which would have cost more. The orig...
by Burngate
Tue Apr 17, 2018 8:47 am
Forum: Troubleshooting
Topic: Pi 3 not generating video anymore. sd card and PSU are okay.
Replies: 18
Views: 526

Re: Pi 3 not booting anymore. sd card and PSU are okay.

Yes, there is ...as long as your monitor has an old-fashioned video input.
There's info in pictorial buying guide; first page has lots of pictures, a few of which might be interesting, such as the wiring of the audio/video jack, and what to look for on the back of the monitor.
by Burngate
Fri Apr 13, 2018 6:17 pm
Forum: General discussion
Topic: Unpleasant new board smell ?
Replies: 54
Views: 5874

Re: Unpleasant new board smell ?

Probably of no interest to anyone, but ... We took my daughter's VW for its full service, MOT, &c. to the local VW dealer. As usual, the last thing they did was give it a spring clean, just to Keep the Customer Satisfied (S & G 1970) It smelt godorfal . Their other customers may think it smells nice...
by Burngate
Fri Apr 13, 2018 8:32 am
Forum: Troubleshooting
Topic: Pi 3 not generating video anymore. sd card and PSU are okay.
Replies: 18
Views: 526

Re: Pi 3 not booting anymore. sd card and PSU are okay.

Just a thought - is the sd-card socket clean, or have the contacts got bent?
by Burngate
Wed Apr 11, 2018 6:36 pm
Forum: Beginners
Topic: Display of Battery Percentage
Replies: 3
Views: 94

Re: Display of Battery Percentage

Batteries are irritating things. While they're being charged, they have one voltage. Start discharging them, the voltage sags gently. Then stays more-or-less constant. Until almost empty, at which point the voltage drops like the side of a house. So you'll probably find even an ADC won't tell you wh...
by Burngate
Sat Apr 07, 2018 11:19 am
Forum: General discussion
Topic: Lightning bolt symbol [solved]
Replies: 31
Views: 1198

Re: Lightning bolt symbol

rishitghosh wrote:
Sat Apr 07, 2018 10:44 am
Affix cable : https://www.amazon.in/gp/product/B0767B ... UTF8&psc=1
At 289 Rupee, about £3, not terrifically expensive. But no information about the guage of wire in it, which is irritating.
by Burngate
Sat Apr 07, 2018 10:33 am
Forum: General discussion
Topic: selling
Replies: 8
Views: 432

Re: selling

Our condolences - one of the more stressful episodes in our lives. It might help to tell us where you are living. Being a world-wide ... passion? movement? ... you might find someone close by who could help you out. Also, if he happened to use this forum to any extent, he might have a log-on which w...
by Burngate
Sat Apr 07, 2018 10:11 am
Forum: Interfacing (DSI, CSI, I2C, etc.)
Topic: Adding 3 buttons to GPIO - resistor question
Replies: 1
Views: 93

Re: Adding 3 buttons to GPIO - resistor question

You've got your buttons / switches connected to your Pi, and you start it up with a new install of Raspbian ... will pressing the buttons break anything? If a GPIO is set as an output, and attempts to drive it high, while a switch attempts to pull it low, bad things could happen. That would be the c...
by Burngate
Thu Apr 05, 2018 11:32 am
Forum: Troubleshooting
Topic: Power LED not working on Pi 3
Replies: 12
Views: 1173

Re: Power LED not working on Pi 3

Do you get the lightning bolt icon?
Has it just started happening? - did the pwr led previously work?
What have you changed between then and now?

Have you a meter - if so, can you measure between pins 2 and 6?

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