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by Burngate
Sat Oct 21, 2017 5:35 pm
Forum: Troubleshooting
Topic: induction problem gpio relay load
Replies: 36
Views: 2184

Re: induction problem gpio relay load

:o I feel so stupid. I put it in so long ago that I forgot ... Many years ago, I built my HiFi system. Over the years, I've altered it, added stuff, changed bits ... Each time I come to it, I've forgotten what I did last time. So I go looking for the paperwork ... can't find it ... tear it apart to...
by Burngate
Sat Oct 21, 2017 5:14 pm
Forum: Beginners
Topic: Feature request: make it easier to customise desktop and start menu shortcuts
Replies: 11
Views: 440

Re: Feature request: make it easier to customise desktop and start menu shortcuts

Hmm Over the years, I've bought a dozen or so new-to-me cars. The major controls - accelerator, brake, clutch, steering wheel - have always been the in the same place and work the same way, so what I learned at age 18 is still applicable today. Windscreen wipers - my Volvo needs a stalk to be shifte...
by Burngate
Sat Oct 21, 2017 11:16 am
Forum: Beginners
Topic: Absolute new to GPIO concept
Replies: 17
Views: 473

Re: Absolute new to GPIO concept

my concept it GPIO is that it has pins, and each pin has different voltage..and when we connect a certain GPIO pin using a jumper cable then it will send that amount of VOLTAGE to the connected device. please correct me if i am wrong. and it also has a ground PIN, whats that for? Electric current g...
by Burngate
Fri Oct 20, 2017 4:51 pm
Forum: Troubleshooting
Topic: induction problem gpio relay load
Replies: 36
Views: 2184

Re: induction problem gpio relay load

Forgive me for being dense, but it appears to me that the power to the solenoids (black and white wires, left hand side of thr Relay.jpg picture) is coming directly from a transformer. If so, then it's AC, not DC. Maybe you could tidy up the wiring round the breadboard, as well as moving the ribbon ...
by Burngate
Fri Oct 20, 2017 10:50 am
Forum: Beginners
Topic: HELP Transmitting Photos Via RF
Replies: 1
Views: 116

Re: HELP Transmitting Photos Via RF

Hmm. Divide the problem into more managable bits. First, the source. 8k x 4.5k infrared camera? You've got one in mind? If not, a little research is necessary. You're wanting to send about 500 8000 x 4500 pixel photos in 24 hours. If they're 8 bits per pixel, uncompressed, I make that 200kB/s. Not u...
by Burngate
Wed Oct 18, 2017 4:55 pm
Forum: Interfacing (DSI, CSI, I2C, etc.)
Topic: Read 4-20mA values or 0-5VDC
Replies: 1
Views: 176

Re: Read 4-20mA values or 0-5VDC

I would recommend the 5v version.

Someone else has been down the same path, so you could perhaps gain some knowledge from that thread
viewtopic.php?f=37&t=194197
by Burngate
Wed Oct 18, 2017 10:30 am
Forum: Graphics, sound and multimedia
Topic: usb card gets hot
Replies: 5
Views: 441

Re: usb card gets hot

I understood him to mean the 3.5mm jack on the Kingwin USB-3DSA sound card, not the Pi's own jack. Almost certainly, the jack's ground connection is connected to the USB power negative, which is connected to the Pi's ground. But that shouldn't be connected to anything else, because the Pi's power su...
by Burngate
Wed Oct 18, 2017 10:15 am
Forum: Beginners
Topic: GPIO Interaction
Replies: 8
Views: 231

Re: GPIO Interaction

Follow Dougie's two Golden Rules: 1) Power down, change wiring, power up. 2) Keep away from pins 2 & 4 But ... Even if you never intentionally break either rule, at some point you will make a mistake, connect two things that shouldn't be connected, and let out the magic smoke. By the time you've rea...
by Burngate
Mon Oct 16, 2017 9:06 am
Forum: Other projects
Topic: Nicd Battery charging Help.
Replies: 4
Views: 267

Re: Nicd Battery charging Help.

Yuasa batteries and car batteries are lead-acid. They're very tolerant of mistreatment - a car alternator just puts 14v or so across it and lets it take whatever current it wants. The automotive industry wouldn't have survived more than a century if the battery was more prone to failure. Once fully ...
by Burngate
Sun Oct 15, 2017 9:45 am
Forum: Other projects
Topic: Nicd Battery charging Help.
Replies: 4
Views: 267

Re: Nicd Battery charging Help.

1, You haven't supplied enough information about the solar panel or the "solar charger controller", so all I can do is guess. I'm guessing it's designed to have a 14.4v NiCd battery attached, and can successfully charge it. But there are lots of different battery technologies, each requiring differe...
by Burngate
Tue Oct 10, 2017 4:55 pm
Forum: Troubleshooting
Topic: Re-start with three cores corrupts SD-card?
Replies: 11
Views: 564

Re: Re-start with three cores corrupts SD-card?

People have reported not getting corruption even without properly shutting down, so not getting corruption several times in a row isn't evidence of no problem. Knowing nothing about the shut-down sequence, so waving hands around frantically in an effort to convince at least someone that I'm not a ch...
by Burngate
Tue Oct 10, 2017 4:37 pm
Forum: Troubleshooting
Topic: HDMI earth /spike causing sd card corruption??
Replies: 4
Views: 177

Re: HDMI earth /spike causing sd card corruption??

... As they are running on the hospital ups there should not be spikes... The ups might isolate the hospital from outside problems, but I would expect things such as MRI scanners to put noise on the internal system. As wally333 says, the Pi is normally floating, and most modern TVs also. Connecting...
by Burngate
Tue Oct 10, 2017 3:53 pm
Forum: Troubleshooting
Topic: Re-start with three cores corrupts SD-card?
Replies: 11
Views: 564

Re: Re-start with three cores corrupts SD-card?

Gert van Loo wrote:
Tue Oct 10, 2017 9:22 am
maxcpus=3.
Does it only happen with 3, or does 2 or 1 do the same?
Does full shutdown followed by restart using the "run" pins also corrupt the card?
by Burngate
Tue Oct 10, 2017 10:47 am
Forum: Beginners
Topic: infared and noir camera.
Replies: 2
Views: 182

Re: infared and noir camera.

... But I read it somewhere seems to suggest that noir is a low light camera, not a true infared camera. Is this true? No, it's not. Whoever wrote that is misinformed. I always thought that noir camera is nothing more than a regular camera such as the pi camera without the ir filter, thus infared c...
by Burngate
Tue Oct 10, 2017 10:18 am
Forum: Beginners
Topic: Powering Pi from PC PSU?
Replies: 4
Views: 206

Re: Powering Pi from PC PSU?

https://www.newegg.com/global/au/Product/Product.aspx?Item=N82E16817170016&cm_re=psu-_-17-170-016-_-Product Just as a matter of interest, I vaguely remember something about those needing a load on one or more of the rails for them to switch on. Hopefully I'm wrong, or it's the 5v rail that requires...
by Burngate
Mon Oct 09, 2017 10:28 am
Forum: Beginners
Topic: Powering Pi from PC PSU?
Replies: 4
Views: 206

Re: Powering Pi from PC PSU?

5v, 25W so 5A. Yes, you can run one or two Pis, maybe more from one rail. A 5A fuse would protect the PSU from accidents such as shorting the output. A separate fuse for each Pi would protect the cable feeding the Pi (otherwise you should use cable that could carry the full 5A to each Pi, even thoug...
by Burngate
Sat Oct 07, 2017 5:03 pm
Forum: Troubleshooting
Topic: Raspberry pi 3 can not read sd card when boot, location set sd card generates sound
Replies: 4
Views: 179

Re: Raspberry pi 3 can not read sd card when boot, location set sd card generates sound

Michael Hold wrote:
Sat Oct 07, 2017 9:48 am
location set SD card
What is that?
generates sound
Apart from a couple of clicks, I heard nothing.
by Burngate
Fri Oct 06, 2017 10:25 am
Forum: Beginners
Topic: Question / help with a project idea.
Replies: 3
Views: 184

Re: Question / help with a project idea.

I wonder if it's possible to take a string of Neopixels https://www.adafruit.com/product/1138, and separate them?
by Burngate
Fri Oct 06, 2017 10:12 am
Forum: Advanced users
Topic: 3 GHz sine wave using raspberry pi
Replies: 7
Views: 675

Re: 3 GHz sine wave using raspberry pi

mahmod rafat wrote:
Thu Oct 05, 2017 2:56 pm
... sine wave signal with frequency 3 GHz ...
How accurate do you need the frequency to be? ±1MHz? ±10Hz?
How pure do you need the sine wave to be? Can you live with its harmonics at -10dB, or do you need better?
Where are you going to send the signal? How much power do you need?
by Burngate
Fri Oct 06, 2017 10:06 am
Forum: General discussion
Topic: gpio header diagram maker
Replies: 22
Views: 928

Re: gpio header diagram maker

Nice. Well worth the £10 (he or she will now have learnt something about the value of time, so your next project will cost you £100) A couple of comments / questions. It's hosted on your Synology device, not my own, so if that dies, my project is lost? Can I keep a back-up on my own system? All the ...
by Burngate
Fri Oct 06, 2017 8:54 am
Forum: General discussion
Topic: unreadable font at https://www.raspberrypi.org/products/ [solved]
Replies: 13
Views: 735

Re: unreadable font at https://www.raspberrypi.org/products/

... but on 5th - yesterday - on the sticky thread https://www.raspberrypi.org/forums/viewtopic.php?f=63&t=187256#p1218978 he said Not hugely exciting, but we had a few pages on the website (products etc) that had a very difficult to read font. This should now be fixed. Not that I can see any problem...
by Burngate
Thu Oct 05, 2017 5:16 pm
Forum: Off topic discussion
Topic: is software harder than hardware? :)
Replies: 38
Views: 2217

Re: is software harder than hardware? :)

Seems to me there are levels of hardware design, and probably also software. Putting a few dozen components on a circuit board isn't the same skill as putting a few arm cores and a gpu onto silicon. But, being more hardware orientated, it seems to me it's easier to just try something and see in soft...
by Burngate
Thu Oct 05, 2017 9:51 am
Forum: General discussion
Topic: Why no enthusiast Raspberry Pi products?
Replies: 53
Views: 2887

Re: Why no enthusiast Raspberry Pi products?

Thanks to those who actually showed up to help, and/or have a conversation. In the future, I'll likely take my thoughts somewhere a little less hostile. I think you might have accidentally hit a tender spot - a bit like asking a Glaswegian why Rangers aren't doing very well. In one pub, you'll get ...
by Burngate
Thu Oct 05, 2017 9:20 am
Forum: Beginners
Topic: Current draw from GPIO pins
Replies: 28
Views: 1038

Re: Current draw from GPIO pins

But it's still up to the user, and the GPIO is still general purpose. The important bit is "input output" That implies signals, data, etc. Not power. If they were intended to supply power, they should be called GPP -- "General Purpose Power". A family car might be described as "General Purpose" in ...
by Burngate
Wed Oct 04, 2017 5:42 pm
Forum: Beginners
Topic: Current draw from GPIO pins
Replies: 28
Views: 1038

Re: Current draw from GPIO pins

GPIO =General Purpose Input Output. That implies a particular use. I would disagree. General purpose means, to me, no particular use at all, do what you want. Powering sensors is not normally part of the role of input/output. Of course, you can draw 16mA from one or more pins, up to the recommended...

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