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by drgeoff
Mon Jun 17, 2019 8:19 am
Forum: General discussion
Topic: "sudo apt-get upgrade"
Replies: 11
Views: 427

Re: "sudo apt-get upgrade"

Try

Code: Select all

sudo apt-get update
sudo apt-get upgrade
by drgeoff
Fri Jun 14, 2019 7:11 pm
Forum: Beginners
Topic: Serial Communication in RPI3
Replies: 10
Views: 225

Re: Serial Communication in RPI3

Yes you should use the RPi's 3.3 volt not 5 volt. Connecting 5 volt TTL signals to any RPi GPIO pin (including the UART Rx) is an easy way to fatally damage the RPi. The GPIOs are not 5 volts tolerant. I had the 5V GPIO pin of the RPI connected to the adapter's 5V, not to a TTL signal. But now I sh...
by drgeoff
Fri Jun 14, 2019 7:02 pm
Forum: General discussion
Topic: Problem with WIFI on latest full raspbian
Replies: 9
Views: 297

Re: Problem with WIFI on latest full raspbian

alphanumeric wrote:
Fri Jun 14, 2019 12:30 pm
JFYI You can use the downloaded file as is with no need to unzip it first. Win32Disk Imager and Etcher can write to the SD card with it as is.
Are you sure Win32DiskImager can use the zipped file?
by drgeoff
Fri Jun 14, 2019 4:33 pm
Forum: Beginners
Topic: Serial Communication in RPI3
Replies: 10
Views: 225

Re: Serial Communication in RPI3

So far my connections are: - Manometer's usb to female-female usb adapter - Female Female adapter connected with USB to TTL Serial - Adapter's RX to RPI's TX - Adapter's TX to RPI's RX - Adapter's ground to RPI's ground - (?) Adapter's +5V to RPI's 5V. (Am I supposed to use the 3.3V instead? Not su...
by drgeoff
Thu Jun 13, 2019 2:38 pm
Forum: General discussion
Topic: CMOS Technology on BCM2837
Replies: 3
Views: 146

Re: CMOS Technology on BCM2837

I don't know the transistor type, but it is 40nm size. That is not strictly accurate. 40nm feature size does not mean the transistors are 40 nm. http://vlsi-soc.blogspot.com/2014/06/feature-size-of-transistors.html https://electronics.stackexchange.com/questions/101568/whats-the-difference-between-...
by drgeoff
Thu Jun 13, 2019 1:56 pm
Forum: HATs and other add-ons
Topic: TV Hat - multiple channels?
Replies: 6
Views: 249

Re: TV Hat - multiple channels?

The standard definition versions of BBC1 and ITV are on different muxes so would need two TV HATs. The HD versions are on the same mux so one TV HAT should suffice.

For full details of what is on each mux see https://ukfree.tv/transmitters/multiplexes
by drgeoff
Tue Jun 11, 2019 8:44 pm
Forum: Automation, sensing and robotics
Topic: irritating battery limits
Replies: 21
Views: 566

Re: irritating battery limits

I am guessing the blue rectangle labelled 5v is a boost regulator? And the 'irrelevant control circuit' is a motor controller? You don't seem to have any battery balancing in place, just three Lipos connected in parallell. I would not recommend this, as it complicates matters. Better to stick to a ...
by drgeoff
Mon Jun 10, 2019 4:03 pm
Forum: General discussion
Topic: how to install application software
Replies: 16
Views: 458

Re: how to install application software

Andyroo wrote:
Mon Jun 10, 2019 3:52 pm
They are no longer in my bookmarks.
Hurry for that! (Maybe too cryptic. If so, look carefully at the first line of Andyroo's second reply in this topic.)
by drgeoff
Sun Jun 09, 2019 8:47 am
Forum: Networking and servers
Topic: Fastest possible WIFI speed on 3B?
Replies: 2
Views: 130

Re: Fastest possible WIFI speed on 3B?

PhatFil wrote:
Sun Jun 09, 2019 12:26 am
A 3B is limited to 54mbs 802.11 g
Incorrect.

The Wi-Fi chip on a 3B supports 802.11 b/g/n and as such is not limited to 54 Mbit/s.

The actual speed that can be achieved in practice depends on too many factors to be able to give a specific number.
by drgeoff
Sat Jun 08, 2019 9:51 pm
Forum: HATs and other add-ons
Topic: PoE hat not working
Replies: 5
Views: 188

Re: PoE hat not working

Andyroo wrote:
Sat Jun 08, 2019 5:47 pm
Wonder if tech support mixed up PPPoE and PoE?

First line from my ISP did not know the user of their routers could read the error logs (let alone understand them) so it would not surprise me.
Sadly, nothing has ever surprised me about first line support from any organisation!
by drgeoff
Sat Jun 08, 2019 2:36 pm
Forum: Media centres
Topic: Samsung Universal Remote CEC with RPi3 OSMC
Replies: 10
Views: 11315

Re: Samsung Universal Remote CEC with RPi3 OSMC

Johanflor3y wrote:
Sat Jun 08, 2019 12:44 pm
Hi, all i fixt iT on my Samsung 2018 model, put in the pi3 and kodi in the arc slot of the tv. Do not create a profil just leave iT to unknown and that work 8-) my remote of my Samsung works now in kodi. 8-) 8-)
Using the ARC equipped HDMI socket is not essential.
by drgeoff
Sat Jun 08, 2019 2:27 pm
Forum: HATs and other add-ons
Topic: PoE hat not working
Replies: 5
Views: 188

Re: PoE hat not working

I have never heard of an ISP supplied home router with PoE equipped port(s).
by drgeoff
Fri Jun 07, 2019 11:16 am
Forum: Wanted
Topic: Blinking LED project to affect people afflicted with Alzheimer’s
Replies: 8
Views: 369

Re: Blinking LED project to affect people afflicted with Alzheimer’s

A couple of $/£/€ will buy a 555 timer IC and the few necessary resistors and capacitors required to generate such low frequencies. With a variable resistor you can adjust the frequency by turning a knob. No RPi. No software.
by drgeoff
Fri Jun 07, 2019 11:10 am
Forum: Networking and servers
Topic: Android 9 gets wrong IP address from RPi access point
Replies: 5
Views: 145

Re: Android 9 Lpgets wrong IP address from RPi access point

Looks like the phone is connected to the data network of your cellular service.
by drgeoff
Thu Jun 06, 2019 6:32 pm
Forum: Beginners
Topic: Error when attempting to format new SD card.
Replies: 34
Views: 709

Re: Error when attempting to format new SD card.

IF YOU IMAGE A CARD USING AN IMAGE WRITER SUCH AS ETCHER, HOWEVER THERE IS NO NEED TO FORMAT THE CARD BEFOREHAND! As Etcher, and other similar programs, simply change every bit in every sector of the card and therefore will overwrite everything that formatting the card has done. The only reason you...
by drgeoff
Thu Jun 06, 2019 1:38 pm
Forum: Beginners
Topic: Error when attempting to format new SD card.
Replies: 34
Views: 709

Re: Error when attempting to format new SD card.

[Most manufactures will not warranty SD cards which have been used in a computer such as a RPi. So how is one expected to print pictures or back up the contents of the SD card??? I think you have misunderstood. A "computer such as a RPi" is subtly different from a computer which is not such as a RPI.
by drgeoff
Thu Jun 06, 2019 8:41 am
Forum: General discussion
Topic: marine navigation
Replies: 6
Views: 246

Re: marine navigation

Sailsquatch wrote:
Wed Jun 05, 2019 1:08 am
i know of a local inventor who has been making thise micro stereos that are pretty loud and use absolutley no power,
Either he or you is not telling the truth.
by drgeoff
Wed Jun 05, 2019 7:42 am
Forum: Automation, sensing and robotics
Topic: Pi in the Car - Accessory Power Monitoring
Replies: 11
Views: 588

Re: Pi in the Car - Accessory Power Monitoring

bpm009 wrote:
Wed Jun 05, 2019 3:08 am
Quick question, forgive my lack of diagram knowledge, but what is being shown with the 2 triangles pointing at each other as the Accessory feed goes to Relay 1?
Diodes.
by drgeoff
Wed Jun 05, 2019 7:33 am
Forum: Advanced users
Topic: RPI Ethernet Gadget intermediary.
Replies: 4
Views: 222

Re: RPI Ethernet Gadget intermediary.

Not clear what you are asking. A Zero has one USB port and no ethernet port. No model of RPi has two ethernet ports. Yes it is feasible to use a USB-ethernet adaptor to add a second ethernet port to a RPi that has ethernet and USB.
by drgeoff
Mon Jun 03, 2019 11:16 pm
Forum: Off topic discussion
Topic: Elgato capture on Raspberry Pi 3 b+?
Replies: 3
Views: 601

Re: Elgato capture on Raspberry Pi 3 b+?

@6by9

I think you have totally misunderstood.

The OP is attempting to capture the HDMI output from a RPi 3B+ using the Elgato on another (unspecified) computer. He is not attempting to capture HDMI into the RPi.
by drgeoff
Mon Jun 03, 2019 6:18 pm
Forum: General discussion
Topic: Why 80 pin IDE cable fried my Pi
Replies: 11
Views: 327

Re: Why 80 pin IDE cable fried my Pi

When the 40 pin interface on IDE drives and motherboards was devised a 20 Mbyte drive would have been considered huge and transfer speeds were low. It was only much later that drive sizes and speeds had increased to the point that the high data rates on the cable gave rise to data corruption (throug...
by drgeoff
Mon Jun 03, 2019 12:42 pm
Forum: Troubleshooting
Topic: g_mass_storage + kenwood car stereo
Replies: 12
Views: 253

Re: g_mass_storage + kenwood car stereo

A Zero or ZeroW may require more power than the USB port of the car stereo is designed to deliver.
by drgeoff
Sun Jun 02, 2019 9:51 pm
Forum: Beginners
Topic: controlling a 12v motor with a transistor - only getting a low noise and slight move in motor
Replies: 4
Views: 165

Re: controlling a 12v motor with a transistor - only getting a low noise and slight move in motor

andresleon wrote:
Sun Jun 02, 2019 8:03 pm
My mistake entirely. I wired it incorrectly. Thank you all for reaching out to assist!
The best thanks I could receive would be for you to promise never to use that abominable "reach out" expression again. :)
by drgeoff
Sun Jun 02, 2019 8:01 pm
Forum: Networking and servers
Topic: DNS conflict
Replies: 8
Views: 223

Re: DNS conflict

Domain Name Servers return an IP address when given a name. If you still have the same problem when doing everything by IP address only then you don't have a DNS conflict or any other DNS issue.
by drgeoff
Sun Jun 02, 2019 7:50 pm
Forum: Troubleshooting
Topic: 2 long blinks and then a short blink
Replies: 11
Views: 161

Re: 2 long blinks and then a short blink

IMO your "messing with GPIO" damaged it. Not repairable.

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