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by FTrevorGowen
Thu Feb 21, 2019 5:35 pm
Forum: General discussion
Topic: Raspberry Pi 3 Model A+ based Tablet projects?
Replies: 5
Views: 184

Re: Raspberry Pi 3 Model A+ based Tablet projects?

Hi, ... So my question: Are there any Model A based tablet projects? Soldering wouldn't be the problem for me but I would like to have an already existing case for Pi, battery and display (the official Raspberry Pi 7" one would be okay). Thx! Well not quite a tablet, but, FWIW, my P3A+ and Raspberr...
by FTrevorGowen
Thu Feb 21, 2019 4:43 pm
Forum: Troubleshooting
Topic: Not getting internet in raspberrypi
Replies: 2
Views: 45

Re: Not getting internet in raspberrypi

... My laptop doesn't have an Ethernet port, so I am using TPlink USB-Ethernet cable. Someone help me...! Is that a USB-to-Ethernet adapter? (ie. similar to one of these but using an ethernet plug rather than a socket) and not one of these: http://www.cpmspectrepi.uk/raspberry_pi/MoinMoinExport/USB...
by FTrevorGowen
Thu Feb 21, 2019 2:31 pm
Forum: Troubleshooting
Topic: Power symbol on desktop
Replies: 5
Views: 81

Re: Power symbol on desktop

It is a raspberry pi 3 model b and the power supply has got 5.1 volts coming out and the following link is the cable I am using https://rover.ebay.com/rover/0/0/0?mpre=https%3A%2F%2Fwww.ebay.co.uk%2Fulk%2Fitm%2F282848279079 O.K. Is it one of the official power supplies** (white or black)? Is the ca...
by FTrevorGowen
Thu Feb 21, 2019 2:06 pm
Forum: Troubleshooting
Topic: Power symbol on desktop
Replies: 5
Views: 81

Re: Power symbol on desktop

Hi all I am currently putting my raspberry pi with the relay board into a self contained box and I have used a panel mount micro usb connector and since I have used this it shows a power symbol on the desktop that goes on and off When I connect the power supply direct to the pi it is ok. Now I know...
by FTrevorGowen
Thu Feb 21, 2019 1:54 pm
Forum: Interfacing (DSI, CSI, I2C, etc.)
Topic: I need help picking Bi-directional Logic Level Converter
Replies: 1
Views: 45

Re: I need help picking Bi-directional Logic Level Converter

Hello, I'm new to the RPI and IC community, and would like an experienced advice/help. I am looking for Bi-directional Logic Level Converter (preferably the contacts supports SPI) 2.2v <--> 3.3v 3.3v <--> 5.5v if you are using/used it before and recommend it, please leave a link of the item below. ...
by FTrevorGowen
Wed Feb 20, 2019 1:52 pm
Forum: Raspbian
Topic: [Solved] etcher validate failed on stretch images (2018-11-13 versions)
Replies: 9
Views: 275

Re: [Solved] etcher validate failed on stretch images (2018-11-13 versions)

Norton will not be my solution as I don't have it. Unless I've enabled something in Preview Program of Windows 10 or they've added something else to it. OOC are you using a "built-in card-slot" or an external, USB-based card reader/writer? (Historically the compatibility of laptop/netbook/tablet ca...
by FTrevorGowen
Wed Feb 20, 2019 1:33 pm
Forum: Beginners
Topic: Power Outage
Replies: 16
Views: 212

Re: Power Outage

Hi forum. I have a question. Why does the Raspberry Pi (i'm using model 3 b+) not automatically restart/startup/bootup/(use what ever name here) when the power is turned back on after a power outage. It seems so strange, especially since they way i'm starting up the pi is to simply plug in the micr...
by FTrevorGowen
Tue Feb 19, 2019 10:40 pm
Forum: Troubleshooting
Topic: HDMI working different on all RPi3 models [solved]
Replies: 4
Views: 132

Re: HDMI working different on all RPi3 models

topguy wrote:
Tue Feb 19, 2019 10:30 am
...
Also someone here will probably give you tips on how to run the "tvservice" command to figure out what the Pi thinks its sending out.
(or you can google it)
Were you thinking of these notes: http://www.cpmspectrepi.uk/raspberry_pi ... tings.html ? :)
Trev.
by FTrevorGowen
Tue Feb 19, 2019 10:35 pm
Forum: Troubleshooting
Topic: RPI 3 b+ don't boot after reboot and stop working after an hour
Replies: 6
Views: 135

Re: RPI 3 b+ don't boot after reboot and stop working after an hour

Thanks for your help! I formated my SD card and reinstall all again, but the problem it's the same. At some point i get [16097.167472] mmcblk0: error -5 sending stop command, original cmd response 0x900, card status 0x900 [16097.167519] mmcblk0: error -5 transferring data, sector 28968400, nr 24, c...
by FTrevorGowen
Sat Feb 16, 2019 8:34 pm
Forum: Advanced users
Topic: Number of devices in a wifi network
Replies: 4
Views: 220

Re: Number of devices in a wifi network

Hi, someone knows approximately how many devices(smartphone) connected at the same time can accept a RPi3(with DHCP router) in stand alone wifi network mode? Can you clarify - are the devices connecting to the Pi's WiFi (ie. using the Pi as an "access point" IIRC) or to the router's WiFi? (If the l...
by FTrevorGowen
Sat Feb 16, 2019 5:22 pm
Forum: Beginners
Topic: Cannot SSH into my Raspberry Pi 3
Replies: 12
Views: 305

Re: Cannot SSH into my Raspberry Pi 3

I did it! I was entering the loopback address that was returned from hostname -I. I looked in ifconfig and read the section of wlan0 inet. Thank you @HawaiianPi and all the others that helped me! :D OOC, I've just run man hostname and refreshed my memory w.r.t. the various options - it seems that t...
by FTrevorGowen
Fri Feb 15, 2019 3:48 pm
Forum: Beginners
Topic: Quick Question - Powering 7" Official Display/Case
Replies: 10
Views: 203

Re: Quick Question - Powering 7" Official Display/Case

It turns out my 64 GB SD card just wasn’t working for boot purposes. I believe the default format for 64GB (and larger) cards is not compatible with the Pi's boot loader. You need some extra magic incantation to format it correctly for NOOBS. No problem with Etcher, which writes a correctly formatt...
by FTrevorGowen
Thu Feb 14, 2019 10:03 pm
Forum: Advanced users
Topic: Run Pi without monitor connected
Replies: 4
Views: 192

Re: Run Pi without monitor connected

Hi guys, I've written some code that turns my pi into a Phase Quadrature mouse emulator. I need this to run basically headless but I need the GUI enabled to process mouse data. Everything works perfect while the monitor is connected but as soon as the monitor is disconnected it stops outputting the...
by FTrevorGowen
Thu Feb 14, 2019 9:26 pm
Forum: Beginners
Topic: Quick Question - Powering 7" Official Display/Case
Replies: 10
Views: 203

Re: Quick Question - Powering 7" Official Display/Case

My display is not powering on. There's no mention of the yellow and green jumper wires in the instructions. Are those supposed to be connected somewhere? Unused parts...hmmm, maybe that's why it's not powering on...? The ribbon video cable is connected to the pi and the display board. I also connec...
by FTrevorGowen
Wed Feb 13, 2019 9:58 pm
Forum: General discussion
Topic: (Micro-)SD Card and its "associated" Pi "Tracking" - a couple of approaches
Replies: 3
Views: 155

Re: (Micro-)SD Card and its "associated" Pi "Tracking" - a couple of approaches

While I appreciate the effort that must have gone into this, I don't think it is of use to me where I have multiple OSs for different hardware spread among my SD cards (TinkerOS, Raspbian, and Android 6.01) I solve this issue by using different brands, because the cards have different paint on them...
by FTrevorGowen
Wed Feb 13, 2019 9:22 pm
Forum: HATs and other add-ons
Topic: [SOLVED] vga666 doesn't work with Raspbian Stretch Full/Lite
Replies: 3
Views: 131

Re: vga666 doesn't work with Raspbian Stretch Full/Lite

Hello, I have a Raspberry Pi Zero W an made me a Gert VGA 666 board. The wireing was double and triple checked. Same with the resistors. I have modyfied the config.txt dtoverlay=vga666 enable_dpi_lcd=1 display_default_lcd=1 #For 1024x768 60Hz dpi_group=2 dpi_mode=16 spi and i2c are disabled. But it...
by FTrevorGowen
Wed Feb 13, 2019 8:51 pm
Forum: General discussion
Topic: (Micro-)SD Card and its "associated" Pi "Tracking" - a couple of approaches
Replies: 3
Views: 155

(Micro-)SD Card and its "associated" Pi "Tracking" - a couple of approaches

If, like me, you have quite a few Pi's and (even more) "associated" uSD cards keeping track of which card was (last) used in which Pi becomes a bit of a headache. Whilst it's relatively easy to give each Pi a unique hostname, because of their small size, uSD cards are difficult to (physically) label...
by FTrevorGowen
Mon Feb 04, 2019 4:31 pm
Forum: Troubleshooting
Topic: Low voltage warning on boot
Replies: 24
Views: 628

Re: Low voltage warning on boot

Thank you all for replying. I have to say that my post has generated a more "spirited" discussion than I would have liked. Lets be pleasant to each other. I did do 4 years of a 5 year electrical apprenticeship in the worlds most famous shipyard. Unfortunately its most famous product sank on its mai...
by FTrevorGowen
Sun Feb 03, 2019 11:11 pm
Forum: Troubleshooting
Topic: Can't write to usb memory stick-pi3b+
Replies: 5
Views: 149

Re: Can't write to usb memory stick-pi3b+

I can't write to my usb memory stick with the file manager even after running sudo chmod 777 CRUCIAL. I suppose I will sudo cp next.. Strange. What O.S? Is it being auto-mounted (by the file manager)? If not, how are you mounting it (eg. have you changed /etc/fstab ?) What make/model and what does ...
by FTrevorGowen
Sat Feb 02, 2019 1:07 pm
Forum: Beginners
Topic: Powering Raspberry pi 3 b+
Replies: 3
Views: 140

Re: Powering Raspberry pi 3 b+

Simple question, im planning to use my samsung charger to power up my rasp, it says that can power a maximum of 5v 2A, but the rasp needs 5v 2.5A to work fine. I want to use it as a pistation. Can i use my charger or should i buy an oficial power supply of 2.5A? OOC, which Samsung charger? Is it on...
by FTrevorGowen
Thu Jan 31, 2019 6:17 pm
Forum: Troubleshooting
Topic: The most stubborn pi3 around. I HAVE GONE UP AND DOWN THE STICKY
Replies: 17
Views: 564

Re: The most stubborn pi3 around. I HAVE GONE UP AND DOWN THE STICKY

... I have also been through 3 different SD cards. 2 Sandisk cards and an official Rpi card with N00bs preinstalled. On all cards I have tried using both the zip and torrent versions of n00bs and installed them on the cards after using the official SD card formatting software with a full overwrite ...
by FTrevorGowen
Thu Jan 31, 2019 4:32 pm
Forum: General discussion
Topic: Two devices blown up while connecting both 3V3 and 5V power supplies with logic switcher
Replies: 3
Views: 195

Re: Two devices blown up while connecting both 3V3 and 5V power supplies with logic switcher

Hi there, I am having issues with the logic 3V3-5V switcher when powered from the RPi. What I need to do is simply increase the output signal ofthe RPi from 3V3 to 5V so using the switcher seems the obvious thing to do (as suggested here https://www.raspberrypi-spy.co.uk/2018/09/using-a-level-shift...
by FTrevorGowen
Wed Jan 30, 2019 2:01 pm
Forum: Interfacing (DSI, CSI, I2C, etc.)
Topic: I2C fails after 3 months
Replies: 8
Views: 342

Re: I2C fails after 3 months

There are no explicit level shifters, as far as I know. Probably the 10k resistors to the +5V should be removed?! But why was it running for such a long period, if the setup is wrong? Yes, remove them. The Pi already has 1k8 pullups to 3.3V built in. (*) Put 350V on a 240V incandescent light bulb a...
by FTrevorGowen
Wed Jan 30, 2019 1:32 pm
Forum: Interfacing (DSI, CSI, I2C, etc.)
Topic: I2C fails after 3 months
Replies: 8
Views: 342

Re: I2C fails after 3 months

Thank you for replying to my post. I don't think that the Python code (or even the driver) causes the problem. Because, I don't even "see" the sensors when using i2cdetect . There are no explicit level shifters, as far as I know. Probably the 10k resistors to the +5V should be removed?! But why was...
by FTrevorGowen
Tue Jan 29, 2019 11:28 pm
Forum: Troubleshooting
Topic: RasPi B+ not power on
Replies: 14
Views: 426

Re: RasPi B+ not power on

... I proved the converter alone and RasPi still reboots. But, if I connect converter output with micro USB adapter to micro USB port, RasPi boots fine. I'm confused :? When not using the "micro USB adapter to micro USB port" how are you connecting the converter output to the Pi? (A photo. would be...

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