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by drgeoff
Wed Apr 24, 2019 8:28 pm
Forum: Troubleshooting
Topic: Low Power icon
Replies: 3
Views: 89

Re: Low Power icon

BTW That icon means low voltage, not low power. Subtle but important difference.
by drgeoff
Wed Apr 24, 2019 7:35 am
Forum: Beginners
Topic: is dead 3V3 a widespread issue?
Replies: 13
Views: 287

Re: is dead 3V3 a widespread issue?

blueagent wrote: ↑
Wed Apr 24, 2019 3:10 am
 i bought a raspberry pi 3 model B+ back in october 2010
Impossible. The very first model of RPi was not launched until February 2012.
by drgeoff
Wed Apr 24, 2019 7:28 am
Forum: General discussion
Topic: Max Power Supply For Raspberry Pi 3 b +
Replies: 34
Views: 700

Re: Max Power Supply For Raspberry Pi 3 b +

Can Anyone Suggest or refer me the Circuit Diagram for 230V AC to 12V DC 5 or 10A power Supply?If Possible, Without Transformer will be good. A transformer of some kind is ESSENTIAL for SAFETY reasons. If you do not understand that you should not attempt to construct a PSU that is fed from AC mains.
by drgeoff
Tue Apr 23, 2019 3:33 pm
Forum: Troubleshooting
Topic: 50 pin cable TFT screen for Raspberry PI 3 B+
Replies: 13
Views: 206

Re: 50 pin cable TFT screen for Raspberry PI 3 B+

No.

You need an interface board which is specific to the actual display you have.
by drgeoff
Tue Apr 23, 2019 3:31 pm
Forum: Beginners
Topic: Pi Zero W Static IP address
Replies: 8
Views: 151

Re: Pi Zero W Static IP address

I have previously found several tutorials, all slightly different depending on the version of Raspbian. All seem to be intended for conection to conventional Broadband routers. I haven't yet found one specific to mobile phone hotspots There is nothing specific needed for mobile phone hotspots. The ...
by drgeoff
Tue Apr 23, 2019 10:53 am
Forum: Beginners
Topic: Pi Zero W Static IP address
Replies: 8
Views: 151

Re: Pi Zero W Static IP address

Follow a tutorial that tells you to edit dhcpcd.conf. Ignore any that modify the interfaces file.
by drgeoff
Mon Apr 22, 2019 4:34 pm
Forum: Off topic discussion
Topic: is the pi worth it?
Replies: 22
Views: 484

Re: is the pi worth it?

fruitoftheloom wrote: ↑
Mon Apr 22, 2019 8:24 am
 but will compliment whatever you buy,
Very unlikely. If you meant "complement" then quite possibly.
by drgeoff
Mon Apr 22, 2019 4:19 pm
Forum: Beginners
Topic: SOLVED: Red light (no act) Stalled - MicroSD cards - Sandisk corrupt or R Pi fried?
Replies: 3
Views: 120

Re: Red light (no act) Stalled - MicroSD cards - Sandisk corrupt or R Pi fried?

BTW there is no spring in the micro-SD card slot of a 3B+. Friction fit only.
by drgeoff
Sun Apr 21, 2019 11:17 am
Forum: Troubleshooting
Topic: Error while making boot SD card: dd: fsync failed for '/dev/sdd': Input/output error
Replies: 6
Views: 122

Re: Error while making boot SD card: dd: fsync failed for '/dev/sdd': Input/output error

dd doesn't care what bytes it is writing. If dd is giving an error message it is not because the file it is writing is corrupted.
by drgeoff
Sat Apr 20, 2019 6:03 pm
Forum: Troubleshooting
Topic: SD woes
Replies: 6
Views: 129

Re: SD woes

Amazon does not sound like a reliable source to me. It does not seem to matter if you buy from Amazon or a reseller now. ‘Sold by Amazon’ used to be solid but now they just seem to buy in any card at a price to move through the chain and maybe get caught themselves. I’ve gone back to supermarket pu...
by drgeoff
Sat Apr 20, 2019 3:44 pm
Forum: Beginners
Topic: ad blocker
Replies: 7
Views: 187

Re: ad blocker

default_user8 wrote: ↑
Sat Apr 20, 2019 1:38 pm
, you will need to be able to change your DNS settings in your router for it to work.
While it is more convenient to change the DNS setting in the router, it is not a requirement. Changing the DNS setting in the computer(s) runing the browsers is equally effective when using PiHole to block ads.
by drgeoff
Sat Apr 20, 2019 11:42 am
Forum: Beginners
Topic: Defective ports?
Replies: 9
Views: 182

Re: Defective ports?

rpdom wrote: ↑
Sat Apr 20, 2019 6:02 am
 3mm should not be an issue for most connectors.
An exception being the 3.5 mm AV socket. The plastic moulding of the plug should come very close to touching the end of the socket's "tube".
by drgeoff
Sat Apr 20, 2019 8:11 am
Forum: Beginners
Topic: How to calculate resistors...
Replies: 55
Views: 924

Re: How to calculate resistors...

So, if the voltage on the positive side of the LED in this case is now 2.54V after the voltage drop from the 1kΩ resistor, and we know the current is 0.74mA - then R of the LED is R = 2.54V / 0.74mA = 3432Ω. That line of thought has the potential to lead you astray. The "resistance" ot the LED is n...
by drgeoff
Fri Apr 19, 2019 6:55 pm
Forum: Networking and servers
Topic: New to networking
Replies: 2
Views: 100

Re: New to networking

Andyroo wrote: ↑
Fri Apr 19, 2019 6:44 pm
 Normally OSMC streams to other devices.
I'm not so sure about that "normally"but OSMC can stream to or from other devices.

Most Synology NAS boxes can run a DLNA server.
by drgeoff
Thu Apr 18, 2019 10:30 pm
Forum: Beginners
Topic: ADC
Replies: 4
Views: 113

Re: ADC

wiem wrote: ↑
Thu Apr 18, 2019 6:24 pm
 it is not the same type , mine is a raspberry shield
It is the same type. There is very little on the board additional to that chip. You can easily find the data sheet for the chip and all the pertinent info that isn't obvious from physical examination of the board can be had from it.
by drgeoff
Thu Apr 18, 2019 7:54 pm
Forum: Beginners
Topic: How to calculate resistors...
Replies: 55
Views: 924

Re: How to calculate resistors...

Maybe one thing here that is throwing me off a bit is these LEDs say they are 20mA - already over the max 16mA GPIO - Probably that 20 mA is the maximum continuous current the LEDs are rated at. Higher than that will adversely affect the lifetime. You should design for a lower current than the maxi...
by drgeoff
Thu Apr 18, 2019 2:07 pm
Forum: Advanced users
Topic: Siri Control-system
Replies: 4
Views: 97

Re: Siri Control-system

So you didn't think that posting the contents of the error messages would help us to help you!
by drgeoff
Thu Apr 18, 2019 1:59 pm
Forum: Beginners
Topic: How to calculate resistors...
Replies: 55
Views: 924

Re: How to calculate resistors...

Figure 2 on the page i linked to in my first post in this thread has typical curves for 8 different LED colours.
by drgeoff
Thu Apr 18, 2019 1:04 pm
Forum: Beginners
Topic: How to calculate resistors...
Replies: 55
Views: 924

Re: How to calculate resistors...

but reality shows that if you put a power supply that can provide more current than the components can take - it blows up. Not quite. The power supply itself should not (in normal operation) be the part that limits the current to what the load can take without endangering the load. A power supply (...
by drgeoff
Thu Apr 18, 2019 9:48 am
Forum: Advanced users
Topic: USB hub chip compatibility
Replies: 9
Views: 295

Re: USB hub chip compatibility

It occurs to me.... The newly release RPF keyboard contains a USB hub. The OP might get one a check to see what chip it uses as one might suspect that the RPT would be certain to use one that is absolutely compatible with Pis. Surely all we need is for someone who has one to report the relevant par...
by drgeoff
Thu Apr 18, 2019 9:45 am
Forum: Troubleshooting
Topic: Raspberry Pi Zero v1.3 (OTG does not work)
Replies: 7
Views: 144

Re: Raspberry Pi Zero v1.3 (OTG does not work)

Ernst wrote: ↑
Thu Apr 18, 2019 9:32 am
 - not enough patience, it took a long time for ssh to get ready on the first boot
Key generation takes a while.
by drgeoff
Thu Apr 18, 2019 7:09 am
Forum: General discussion
Topic: Max Power Supply For Raspberry Pi 3 b +
Replies: 34
Views: 700

Re: Max Power Supply For Raspberry Pi 3 b +

Ok, I think this is good, and that's too much order need. Can' t they just Provide a custom rasp as Sample or Experiment. I just need Like 2-3 right now for Experiment with my product. I expect Element14 will be quite happy to send you only 3 custom designed and manufactured RPis provided you pay f...
by drgeoff
Thu Apr 18, 2019 6:18 am
Forum: General discussion
Topic: Max Power Supply For Raspberry Pi 3 b +
Replies: 34
Views: 700

Re: Max Power Supply For Raspberry Pi 3 b +

Th RPi will not take more current than it needs. You could use a 5 volt 20 Amp supply and not cause damage to the RPi though there are other reasons why that might not be advisable. You question about how much current from the GPIO is unclear. The GPIO header has many pins. Some of those are logic o...
by drgeoff
Thu Apr 18, 2019 6:09 am
Forum: Beginners
Topic: ADC
Replies: 4
Views: 113

Re: ADC

Put ADS1115 into a search engine.
by drgeoff
Thu Apr 18, 2019 6:06 am
Forum: Beginners
Topic: How to calculate resistors...
Replies: 55
Views: 924

Re: How to calculate resistors...

In your LED plus resistor case it is the combination of those two plus the voltage that determines the resulting current. While Ohm's Law applies to the resistor (ie voltage, current and resistance are linearly related) the same is not true of the LED. It has a "forward voltage" which is relatively ...

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