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by drgeoff
Sun Jul 12, 2020 7:55 am
Forum: Troubleshooting
Topic: New to pi and sd won't boot
Replies: 1
Views: 40

Re: New to pi and sd won't boot

Read the "not booting" sticky.
by drgeoff
Sat Jul 11, 2020 10:58 pm
Forum: Troubleshooting
Topic: Booted once, wont boot. Followed stickies..
Replies: 16
Views: 329

Re: Booted once, wont boot. Followed stickies..

I hadn't counted on someone who wrote "award winning 1" cubed nano fighting robots. I even wrote the C code to a robot that sorts M&M candies into piles by color, that I also designed using atmel processors from scratch before arduino was designed and marketed. Yes, 20 years ago! I've been at this t...
by drgeoff
Sat Jul 11, 2020 10:23 pm
Forum: Troubleshooting
Topic: Booted once, wont boot. Followed stickies..
Replies: 16
Views: 329

Re: Booted once, wont boot. Followed stickies..

As you have the means to flash SD cards you obviously have another computer. Find and follow the instructions to enable the ssh server on the RPi, connect by ethernet to your router and ssh in to the RPi. Or optionally find and follow the instructions to configure the RPi to connect to your Wi-Fi an...
by drgeoff
Sat Jul 11, 2020 9:54 pm
Forum: General discussion
Topic: Is there a limit on the number of USB ports used by the Pi4?
Replies: 2
Views: 133

Re: Is there a limit on the number of USB ports used by the Pi4?

Yes there is a limit but you'll be fine with adding a 4-port USB hub.
by drgeoff
Sat Jul 11, 2020 8:15 pm
Forum: General discussion
Topic: HDMI cable and Pi4b case
Replies: 5
Views: 198

Re: HDMI cable and Pi4b case

Enlarge the hole in the plastic case?
by drgeoff
Sat Jul 11, 2020 5:54 pm
Forum: Ubuntu
Topic: wired usb keyboard and mouse not inputting data
Replies: 15
Views: 364

Re: wired usb keyboard and mouse not inputting data

The cheap £2 PS/2 adaptors on ebay didn't work properly with my UK keyboard, none of the media keys worked and country specific positions such as the backslash, hash key, bar etc were all wrong. It may work ok for a US keyboard with no media keys. The adaptor that did work was the StarTech, this on...
by drgeoff
Sat Jul 11, 2020 5:24 pm
Forum: General discussion
Topic: How do I install uSB 3.0 Drivers I have a USB hard drive that isn't showing up on pi4
Replies: 31
Views: 1060

Re: How do I install uSB 3.0 Drivers I have a USB hard drive that isn't showing up on pi4

That Plextor is an SSD, not a hard drive.

From Specifications:
Power Requirement DC 3.3V 2.5A (Max.)
by drgeoff
Sat Jul 11, 2020 10:42 am
Forum: Advanced users
Topic: Reclaim space after SD Card Clone
Replies: 4
Views: 1138

Re: Reclaim space after SD Card Clone

jagganath wrote:
Sat Jul 11, 2020 10:09 am
any update on this SD reclamation ? there is no more "raspi-config"
Yes there is. From terminal or from one of GUI menus.
by drgeoff
Sat Jul 11, 2020 9:12 am
Forum: General discussion
Topic: Raspberry Pi for industrial applications.
Replies: 8
Views: 336

Re: Raspberry Pi for industrial applications.

The "discontinued" on those PiHut pages means that PiHut have discontinued stocking and selling them.
by drgeoff
Sat Jul 11, 2020 9:04 am
Forum: Beginners
Topic: How to take control of Android from RPI?
Replies: 6
Views: 217

Re: How to take control of Android from RPI?

just install Termux on your smartphone and you will have full access to your Android (of course within the limits of a normal 'app') via 'ssh', 'scp', 'rsync' and all the other useful tools known from linux. The first rule of recovery of deleted files is do not write anything to the storage medium....
by drgeoff
Sat Jul 11, 2020 7:46 am
Forum: Beginners
Topic: Can the Pi 4 communicate over the USB C port?
Replies: 5
Views: 207

Re: Can the Pi 4 communicate over the USB C port?

The USB-C socket on a RPi4B can be configured as a USB2.0 host or client port.
by drgeoff
Fri Jul 10, 2020 11:26 pm
Forum: General discussion
Topic: RPi to old TV set up...
Replies: 22
Views: 533

Re: RPi to old TV set up...

What I want to know is, WTAF were they thinking connecting the chassis to neutral (if I've understood the other thread on this basic topic well enough)? There must have been a reason, but for the life of me I can't see it. Maybe you are too young! This was circa 1971. Electronic components were sig...
by drgeoff
Fri Jul 10, 2020 10:50 pm
Forum: General discussion
Topic: RPi to old TV set up...
Replies: 22
Views: 533

Re: RPi to old TV set up...

davidcoton wrote:
Fri Jul 10, 2020 9:43 pm
DO NOT ADD ANY EXTRA CONNECTIONS TO OLD TELEVISIONS
unless you know that the chassis is isolated, or you can design mains-proof isolation into your connection (that is NOT simple).
+1
by drgeoff
Fri Jul 10, 2020 10:47 pm
Forum: General discussion
Topic: RPi to old TV set up...
Replies: 22
Views: 533

Re: RPi to old TV set up...

hippy wrote:
Fri Jul 10, 2020 9:05 pm
Dazzathedrummer wrote:
Fri Jul 10, 2020 8:52 pm
There’s a red button on the back that cuts the whole thing off - I guess that’s some kind of panic button!
Possibly a resettable fuse for when things do go bad.
Correct.
by drgeoff
Fri Jul 10, 2020 8:35 pm
Forum: General discussion
Topic: RPi to old TV set up...
Replies: 22
Views: 533

Re: RPi to old TV set up...

One of the original "PAL patent avoiding" Sonys. The Hue control is the clue for that. Model no. something like KV-1320UB. I still have an even earlier 1300UB model. Black case without the speaker grille panel left of the 1320 screen. Speaker on right below the tuning knob and controls. Both models ...
by drgeoff
Fri Jul 10, 2020 6:06 pm
Forum: General discussion
Topic: RPi to old TV set up...
Replies: 22
Views: 533

Re: RPi to old TV set up...

If you still have an old VHS recorder up in the loft you can use that as an RF modulator. Even if not the final solution it will let you see if the achievable result meets your quality requirements. If it doesn't, don't waste your money buying other RF modulators because they will not be any better....
by drgeoff
Fri Jul 10, 2020 2:19 pm
Forum: Networking and servers
Topic: Can I use Pi as second router configured to use different DNS service?
Replies: 3
Views: 111

Re: Can I use Pi as second router configured to use different DNS service?

You need to disable the DHCP server on your Netgear router. Then run your own DHCP server (which is used to push DNS settings to client machines) on your Raspberry Pi. With dhcpd and something like this in /etc/dhcpd.conf ( not dhcp c d.conf) # Sample /etc/dhcpd.conf # (add your comments here) defa...
by drgeoff
Thu Jul 09, 2020 11:26 pm
Forum: General discussion
Topic: 3.5" GPIO LCD Display Troubles
Replies: 3
Views: 131

Re: 3.5" GPIO LCD Display Troubles

Try running raspi-config and enable "boot to desktop".

(BTW that flashing thing is called a cursor, not "course".)
by drgeoff
Thu Jul 09, 2020 10:14 pm
Forum: Graphics, sound and multimedia
Topic: How to configure the composite video output to a 7" LCD?
Replies: 11
Views: 249

Re: How to configure the composite video output to a 7" LCD?

i believe the composite output is disabled if hdmi is detected on he rpi4, composite remains off by default and you need to enable it in config.txt The first line of the opening post contains "... and want to use it for my Raspberry Pi 3B+ ." One "DL" is enough on these forums is sufficient, thank ...
by drgeoff
Thu Jul 09, 2020 6:39 pm
Forum: Beginners
Topic: GPIO - high side switching an LED
Replies: 5
Views: 169

Re: GPIO - high side switching an LED

I can't seem to figure out how to high-switch an LED for a matrix that I'm building. It needs to be high-switchable. I tried building a Sziklai Pair circuit but it would not with the GPIO as the GPIO isn't strictly an on/off switch. It seems to be too sensitive, I can turn the led on or off using m...
by drgeoff
Thu Jul 09, 2020 4:45 pm
Forum: Troubleshooting
Topic: Please help, Blender3D is rebooting my raspberry
Replies: 3
Views: 126

Re: Please help, Blender3D is rebooting my raspberry

The red LED should never go out. You need to be certain that you don't have a power supply problem before other troubleshooting. Use a proper PSU, not a phone charger. Especially not a charger that has been damaged previously.
by drgeoff
Thu Jul 09, 2020 4:30 pm
Forum: Graphics, sound and multimedia
Topic: How to configure the composite video output to a 7" LCD?
Replies: 11
Views: 249

Re: How to configure the composite video output to a 7" LCD?

Are you sure the RPi is now booting? Red LED steady and green one flashing randomly for circa 30 seconds?

What happens if you reinstall the OS you began with?
by drgeoff
Thu Jul 09, 2020 3:53 pm
Forum: Other projects
Topic: Homemade Powerbank trouble
Replies: 2
Views: 104

Re: Homemade Powerbank trouble

From https://grobotronics.com/powerbank-modu ... html?sl=en

"Output current: 1A (max.)"

1 Amp is not enough to run a RPi4B.
by drgeoff
Thu Jul 09, 2020 3:39 pm
Forum: General discussion
Topic: Powerswitch that prevents startup after powercut
Replies: 16
Views: 498

Re: Powerswitch that prevents startup after powercut

Back to your original circuit. Have you checked that the relay is operating? Disconnect the mains from it and instead connect a multimeter, set to ohms or continuity, to the COM and NO terminals. Push and hold the switch to power up the RPi and confirm that after the RPi boots you get continuity.
by drgeoff
Thu Jul 09, 2020 1:42 pm
Forum: Beginners
Topic: is it possible to use 3x 1440p monitors at same time with Raspi4?
Replies: 6
Views: 230

Re: is it possible to use 3x 1440p monitors at same time with Raspi4?

If the aim is to have the same content on the three monitors you can use something along the lines of https://www.amazon.co.uk/Splitter-Xbox3 ... B00LM4IJ60 or https://www.amazon.co.uk/dp/B07VNDK84Z

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