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by FTrevorGowen
Sun Apr 21, 2019 11:34 am
Forum: Troubleshooting
Topic: Rpi 3 b+. Boot from USB not working. Do I have a defective device?
Replies: 8
Views: 170

Re: Rpi 3 b+. Boot from USB not working. Do I have a defective device?

Are your USB3 pendrives backwards compatible to USB2? ... +1 (& likewise if the card reader is USB3). Did you let Etcher unzip the zipped image file or use something else? Did you check the downloaded file's checksum? You're definitely writing a Raspbian image file, ( not the NOOBS installer - the ...
by FTrevorGowen
Sat Apr 20, 2019 9:11 pm
Forum: Troubleshooting
Topic: Rpi 3 b+. Boot from USB not working. Do I have a defective device?
Replies: 8
Views: 170

Re: Rpi 3 b+. Boot from USB not working. Do I have a defective device?

... I'm attempting to use latest distro from https://www.raspberrypi.org/downloads/raspbian/. I have put the distro on sd-card and usb-drive. I think my Rpi defective because USB-stick LED even doesn't light up, which means as I understand that there is no voltage on on USB ports. How (physically a...
by FTrevorGowen
Fri Apr 19, 2019 4:05 pm
Forum: Beginners
Topic: swapping boot media between models
Replies: 6
Views: 77

Re: swapping boot media between models

Hi Folks, I have a Pi 2 Model B version 1.1 I've been using for a file server. It's running Raspian Stretch not from noobs It runs of an SD card since that model doesn't support USB boot I'd like to move the system image to a USB flash drive and run it in a Pi 3B Plus I'm thinking the flash drive i...
by FTrevorGowen
Fri Apr 19, 2019 11:56 am
Forum: Beginners
Topic: Controlling RPi via another RPi (WIFI)
Replies: 2
Views: 39

Re: Controlling RPi via another RPi (WIFI)

Hello, I have been doing some research, but I can´t find the ideal solution. My problem is that I need to connect an RPIB+ as a master to control an RPIWZ as a slave via Wifi. My objective is to send commands from the RPIB+ to move a "car" two motors using the GPIO with the RPIZW all in a python en...
by FTrevorGowen
Wed Apr 17, 2019 4:30 pm
Forum: Raspbian
Topic: Spurious carriage return output to tty1 about 25/30 seconds after first login prompt following a boot
Replies: 4
Views: 141

Re: Spurious carriage return output to tty1 about 25/30 seconds after first login prompt following a boot

Thanks Trevor Do you have any more pointers that help be find the bug report over at Debian. Roger A long time ago I did find something but now I can't find it at all. But somewhere in the back of my mind I seem to remember that it is related to fsck running in the background after reboot. While se...
by FTrevorGowen
Tue Apr 16, 2019 7:58 pm
Forum: Troubleshooting
Topic: Another Pi 3B+ 3v3 problem
Replies: 6
Views: 168

Re: Another Pi 3B+ 3v3 problem

Andyroo i did not mean that people behind raspberry should do it but me and others who experiment because i think that it is impossible not make a fault sometime and then "puff" Historically many folks have used a separate 3.3V supply derived from the 5V not so much as to "avoid a fault" but becaus...
by FTrevorGowen
Tue Apr 16, 2019 6:51 pm
Forum: Raspbian
Topic: Spurious carriage return output to tty1 about 25/30 seconds after first login prompt following a boot
Replies: 4
Views: 141

Re: Spurious carriage return output to tty1 about 25/30 seconds after first login prompt following a boot

Has anyone else noticed this? On a pi not running any graphical desktop. Boot or reboot and watch the boot log rolling up the screen. At the end of the boot sequence a login prompt appears on the first virtual console (tty1). Wait for about 30 seconds and a spurious carriage return is output to the...
by FTrevorGowen
Tue Apr 16, 2019 1:45 pm
Forum: Advanced users
Topic: USB hub chip compatibility
Replies: 9
Views: 271

Re: USB hub chip compatibility

Can you provide details on your non-working hubs? I've used some starting at 0,99EUR up to some 20EUR and all of them work flawlessly. If your Hub has a Ethernet Port in addition then your comment is valid. +1 and, FWIW, I logged some data about quite a few in my "early Pi" days - at that time some...
by FTrevorGowen
Sun Apr 14, 2019 8:12 pm
Forum: Advanced users
Topic: (List) Compatible USB-Ethernet devices
Replies: 2
Views: 112

Re: (List) Compatible USB-Ethernet devices

Simple wrote:
Thu Apr 11, 2019 4:30 pm
Is there a consensus on which one is best?
Define "best" . FWIW, here's some info. on the USB2.0 ones I've tried:
http://www.cpmspectrepi.uk/raspberry_pi ... pters.html
Trev.
by FTrevorGowen
Sat Apr 13, 2019 6:02 pm
Forum: Troubleshooting
Topic: SD Card Copier Problem
Replies: 2
Views: 81

Re: SD Card Copier Problem

Hi, I'm a noob and using the noob distribution, debian 9.8 Stretch. My Pi is 3B +. I want to make a backup of a fresh Linux system, before installing additional software. When I use the "SD Card Copier" program, copying the debian system is very long, more than 13 hours for the first time. Is this ...
by FTrevorGowen
Sat Apr 13, 2019 5:31 pm
Forum: General discussion
Topic: Can I just use a USB -> Ethernet adapter on a RPi Zero?
Replies: 6
Views: 174

Re: Can I just use a USB -> Ethernet adapter on a RPi Zero?

FWIW, I've tested** quite a few "over the years":
http://www.cpmspectrepi.uk/raspberry_pi ... pters.html
(** with A, A+ or zero Pi's)
Trev.
by FTrevorGowen
Tue Apr 09, 2019 7:30 pm
Forum: Beginners
Topic: Is 2.4A 5V not enough for pi 3 b+?
Replies: 17
Views: 393

Re: Is 2.4A 5V not enough for pi 3 b+?

I have used a Motorola fast phone charge on a Pi with no problem, so it really depends on the quality of the charger and the cable. But as others have said, the best option is to buy a dedicated power supply. before I add my comment, I fully support the recommendation to use the official raspberry ...
by FTrevorGowen
Sat Apr 06, 2019 3:35 pm
Forum: Interfacing (DSI, CSI, I2C, etc.)
Topic: python i2c lcd NLVC1626A 16x2 big character (LCD 19264?)
Replies: 4
Views: 296

Re: python i2c lcd NLVC1626A 16x2 big character (LCD 19264?)

I tried a second time to write on the lcd, but nothing seems to work now, what can possibly gone wrong? Thanks. Emanuele Are you powering the display with 5V with the Pi's I2C pulling up to 3.3V? If so try reducing the display supply voltage (and re-tweaking the contrast pot) - see here: http://www...
by FTrevorGowen
Tue Apr 02, 2019 10:55 pm
Forum: Advanced users
Topic: GPIO States on Boot for Pi 3B
Replies: 2
Views: 111

Re: GPIO States on Boot for Pi 3B

Hi Guys, I'm having a bit of a nightmare with GPIO pins on boot up, has anyone got a list of the pins that are pulled HIGH and LOW on reboot please? This is on a Pi Model 3B running the following : my.hostname.here 4.9.35-v7+ #1014 SMP Fri Jun 30 14:47:43 BST 2017 armv7l GNU/Linux Apologies if this...
by FTrevorGowen
Mon Apr 01, 2019 7:44 pm
Forum: Troubleshooting
Topic: USb devices and low voltage
Replies: 13
Views: 260

Re: USb devices and low voltage

Simplest and lowest cost fix is to buy a power supply and stop using a charger. Chargers can deliver below 4.5v and still be classed as working fine where as the Pi will complain like mad at this. Get one of the official power suppliers made by the foundation - it delivers 5.1v, has decent cable an...
by FTrevorGowen
Sat Mar 30, 2019 1:21 pm
Forum: Raspbian
Topic: hplip version
Replies: 2
Views: 103

Re: hplip version

... I install the following packages for my HP Envy 4500 Printer: system-config-printer hplip simple-scan I personally have found system-config-printer GUI easier than CUPS for setting up printer...... +1 (although I haven't done so since "Wheezy" : http://www.cpmspectrepi.uk/raspberry_pi/MoinMoinE...
by FTrevorGowen
Fri Mar 29, 2019 2:04 pm
Forum: Troubleshooting
Topic: 5V on test points but still undervoltage lightning bolt
Replies: 15
Views: 447

Re: 5V on test points but still undervoltage lightning bolt

... However, when I use a Power Supply at 12V going through a Voltage Regulator (up to 3A Output Load Current) and then to the Pi, the Pi often times fails to boot and always shows the undervoltage lightning bolt on the display. However, when I the measure voltage on the PP7 test point it also show...
by FTrevorGowen
Thu Mar 28, 2019 10:32 pm
Forum: Beginners
Topic: Getting started. Something wrong
Replies: 14
Views: 373

Re: Getting started. Something wrong

... I Downloaded Raspibian "Raspbian Stretch with desktop and recommended software" and "Raspbian Stretch with desktop" from www.raspberrypi.org/downloads/raspbian/ I installed the image to a SD card as I have done many times before ( dd if=2018-11-13-raspbian-stretch.img of=/dev/mmcblk0 ) ... On w...
by FTrevorGowen
Thu Mar 28, 2019 10:23 pm
Forum: General discussion
Topic: Enabling I2C on Raspberry Pi
Replies: 24
Views: 509

Re: Enabling I2C on Raspberry Pi

No I checked but I definitely have it wired as shown. Could it be possible my bread board is dead? How can I check? As @joan has said more explicitly than I did, the diagram does not seem to correspond with your photo. ... AFAICT from your 1st. photo. (compared to the diagram etc.) you may have the...
by FTrevorGowen
Wed Mar 27, 2019 4:28 pm
Forum: Troubleshooting
Topic: Pi 3 B+ doesn't boot from USB-Stick
Replies: 5
Views: 140

Re: Pi 3 B+ doesn't boot from USB-Stick

FWIW, the "simple option" that worked for me was to plug a (pristine, unused) USB flash drive into my P3B+ that was already known to boot from it's uSDHC card and clone the O.S. (Raspbian) to the USB flash drive with Raspbian's SD Card Copier tool. Safely shut & power down the P3B+. Remove the uSDHC...
by FTrevorGowen
Wed Mar 27, 2019 4:10 pm
Forum: General discussion
Topic: Useful addon for GPIO
Replies: 4
Views: 225

Re: Useful addon for GPIO

Another great idea from Alex at Raspi.tv https://shop.rasp.io/products/breadboard-pi-bridge-pi-ports-to-breadboard-in-numerical-order PeterO A long-needed update of this perhaps: http://www.cpmspectrepi.uk/raspberry_pi/MoinMoinExport/SILbreakoutHeader.html ** Well done Alex, Trev. **FWIW a few othe...
by FTrevorGowen
Thu Mar 21, 2019 8:41 pm
Forum: Interfacing (DSI, CSI, I2C, etc.)
Topic: What are the usb-rs232 modules that can work with raspberry pi?
Replies: 2
Views: 108

Re: What are the usb-rs232 modules that can work with raspberry pi?

I am using digitus usb rs232 converter with raspberry. Is there a cheaper usb usb rs232 converter? Can you give me advice about this? In which "direction" do you wish to work? 1) USB (Pi) to (true) RS232 levels at the "other device" end or 2) USB at the "other device" end to 3.3V TTL ("RS232") seri...
by FTrevorGowen
Tue Mar 19, 2019 5:35 pm
Forum: Interfacing (DSI, CSI, I2C, etc.)
Topic: Original SD Card wiring 3 B+
Replies: 3
Views: 139

Re: Original SD Card wiring 3 B+

If that doesn't pan out for you, have you considered switching to booting it from a USB Thumb drive? I would think that should be doable on a 3B+ with minimal fuss. Or even from (your original, if not corrupted) uSDHC card in a uUSB card reader as I've just checked out: pi@raspiP3Bplus18:~ $ uname ...
by FTrevorGowen
Tue Mar 19, 2019 11:36 am
Forum: General discussion
Topic: Power supply Raspberry, Touch-Screen, Cooling-Fan and RFID-Reader
Replies: 7
Views: 210

Re: Power supply Raspberry, Touch-Screen, Cooling-Fan and RFID-Reader

I have two questions, first of all I wanted to ask if it is possible to easily run a raspberry pi 3B+, with a touch-screen, a coolig-fan and a RFID-Reader, just with the normal "Raspberry Pi Universal Power Supply"? ... Not sure about the fan (never needed to use one or a heatsink) but, apart from ...
by FTrevorGowen
Tue Mar 19, 2019 11:26 am
Forum: Interfacing (DSI, CSI, I2C, etc.)
Topic: Variable length read from I2C
Replies: 5
Views: 267

Re: Variable length read from I2C

I have to do it in one read command since the device expects me to do a block read. As a 'C' programmer I suspect you need something like this: http://abyz.me.uk/rpi/pigpio/cif.html#i2cReadBlockData from @joan's pigpio library. (IIRC, I've used the "write" equivalent/similar module in the past to s...

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