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by RattusRattus
Sun Apr 04, 2021 2:16 pm
Forum: Troubleshooting
Topic: installation and starting of SAMBA
Replies: 4
Views: 317

Re: installation and starting of SAMBA

Hi there, I am struggling to see what your problem is. When you tried to install samba the system tells you it is already installed and at the latest version. Why do you think that this is a problem? just because SAMBA is installed does not mean that it is configured.... perhaps you need to configur...
by RattusRattus
Mon Mar 29, 2021 5:15 pm
Forum: HATs and other add-ons
Topic: Two HATS? GPS and PoE?
Replies: 2
Views: 406

Re: Two HATS? GPS and PoE?

See post: https://www.raspberrypi.org/blog/introducing-power-over-ethernet-poe-hat/ Because the fan is controlled over I2C, none of the GPIO are used, so you can stack a second HAT on top of the connector. To do this you will need to buy some longer pass-through headers that expose the pins on the o...
by RattusRattus
Fri Mar 26, 2021 2:05 pm
Forum: Beginners
Topic: Powering LED on/off via USB
Replies: 5
Views: 241

Re: Powering LED on/off via USB

Hi there, Sure you can turn an LED on and off if it connected to a USB port. There are plenty of microcontrollers that you can get (including the Pico https://www.raspberrypi.org/products/raspberry-pi-pico/ ) that you can power and control using USB from the RPi. The micro can easily turn on or off ...
by RattusRattus
Thu Mar 25, 2021 7:45 pm
Forum: Interfacing (DSI, CSI, I2C, etc.)
Topic: Which Pin Should Connect to Which for This OLED Display?
Replies: 5
Views: 647

Re: Which Pin Should Connect to Which for This OLED Display?

WARNING I COULD NOT BE BOTHERED TO CHECK THAT VOLTAGES OF YOUR SYSTEM ARE COMPATIBLE AND NOR CAN I BE HELD RESPONSIBLE FOR ANY ERRORS - WHILST I THINK I AM CORRECT PROCEED AT YOUR OWN RISK looking at the photo of the display rear you can see a table showing how to connect the display. The board in t...
by RattusRattus
Thu Mar 25, 2021 7:20 pm
Forum: Advanced users
Topic: GPIO to detect closure from Sat receiver
Replies: 2
Views: 164

Re: GPIO to detect closure from Sat receiver

Hi, I think that you are saying is that you want to be able to perform auto insert into your radio station: this will be using a satellite based fill in service (SRN perhaps?) Cues for these events are provided by a voltage free (open collector/drain?) output on your satellite receiver Different pin...
by RattusRattus
Wed Mar 24, 2021 7:43 pm
Forum: Beginners
Topic: I2C smbus - write_byte vs write_byte_data
Replies: 1
Views: 533

Re: I2C smbus - write_byte vs write_byte_data

Sure I2C devices sit on a bus at a given address; i2c_addr You can write/send a byte, value , of data to the I2C device using write_byte(i2c_addr, value, force=None) this will simply present your data, value , to the i2C device on address, i2c_addr , on the i2c bus. Now consider that the I2C device ...
by RattusRattus
Tue Dec 22, 2020 10:02 am
Forum: Beginners
Topic: Any GSM modules that will work for the next few years?
Replies: 4
Views: 256

Re: Any GSM modules that will work for the next few years?

where are you on the planet? If you are in the UK I wouldn't worry about 2G being turned of for some years yet, I work in the industry and there are too many 2G only systems still in use, likewise depending on where you are network coverage falls back to 2G all too often. Expect 3G to go away first,...
by RattusRattus
Sat Nov 28, 2020 10:06 pm
Forum: Raspberry Pi 400
Topic: USB Pi 48v Phantom power
Replies: 4
Views: 916

Re: USB Pi 48v Phantom power

hi there,

So 48V phantom power

Typically that means you will need a 48V power source to power the remote device (by sending the power down your XLR cable).
The Pi (and a USB hub) are both 5V

Sorry
/Andy
by RattusRattus
Thu Oct 29, 2020 7:02 pm
Forum: Graphics, sound and multimedia
Topic: Large Touchscreen
Replies: 1
Views: 251

Re: Large Touchscreen

At work we use displays from these guys:
https://www.lilliputuk.com/

We run Android on custom hardware (not a RPi but close enough HW that you shouldn't have a problem)

They work, YMMV. This is NOT a recommendation, I have personally never brought from them.

/Andy
by RattusRattus
Thu Oct 29, 2020 6:56 pm
Forum: Troubleshooting
Topic: External HDD won't power off when connected to USB3 (Rpi4 B 1.4)
Replies: 5
Views: 358

Re: External HDD won't power off when connected to USB3 (Rpi4 B 1.4)

I know I am being pedantic here but SPINNING DOWN disks is not the same as POWER OFF. SPINNING DOWN a disk will put it into a standby state, it still draws power (all be it a lot less than when it is active) but it is not powered off - for a start you can send it a command to start up again.... The ...
by RattusRattus
Sun Oct 25, 2020 5:52 pm
Forum: Troubleshooting
Topic: External HDD won't power off when connected to USB3 (Rpi4 B 1.4)
Replies: 5
Views: 358

Re: External HDD won't power off when connected to USB3 (Rpi4 B 1.4)

Having just read the thread that you pointed to it clearly states that the +5V line remains active, so yes I would expect a USB device not to power off... Unfortunately the reduced schematic https://www.raspberrypi.org/documentation/hardware/raspberrypi/schematics/rpi_SCH_4b_4p0_reduced.pdf doesn't ...
by RattusRattus
Sun Oct 25, 2020 3:34 pm
Forum: Interfacing (DSI, CSI, I2C, etc.)
Topic: Switching negative voltages
Replies: 25
Views: 1779

Re: Switching negative voltages

Are you sure that you want to switch negative voltages? I think you might be interested in switching a Gate that is negative relative to to the Drain.... a fairly good tutorial series is https://www.electronics-tutorials.ws/category/transistor (TL:DR try this subtopic https://www.electronics-tutoria...
by RattusRattus
Sun Oct 18, 2020 9:48 pm
Forum: General discussion
Topic: Overlay two webcam video feeds for realtime red blue 3D.
Replies: 3
Views: 280

Re: Overlay two webcam video feeds for realtime red blue 3D.

Hi there and welcom to the forum Good question! I can't say that I have an answer for you, only that it sounds possible. If it was me attempting this I would try and split the problem down: #1 convert each stream into black and white in an RGB format, all three colour channels (RG&B) should now ...
by RattusRattus
Sun Oct 18, 2020 9:03 pm
Forum: General discussion
Topic: How can I see which file is being accessed in SAMBA?
Replies: 2
Views: 172

Re: How can I see which file is being accessed in SAMBA?

try sudo smbstatus -L for more information take a look at the smbstatus manpage :-) This will only show what is open at the time you call smbstatus. HOWEVER, for a lot of programs, the process will be: open a file read entire content if that file into RAM close the file Now, even though the user may...
by RattusRattus
Sun Oct 04, 2020 6:36 pm
Forum: Troubleshooting
Topic: SSH Connection keeps timing out
Replies: 2
Views: 135

Re: SSH Connection keeps timing out

Hi there,

Sounds like the IP address that you used to have for your RPi has changed.

I am making an assumption that you get IP address assignation using DHCP from your wifi/router? if so have a look on your router to see what new address your RPi has been given...

/Andy
by RattusRattus
Sat Sep 19, 2020 10:12 pm
Forum: Compute Module
Topic: thinner/flusher connector for SODIMM and CM3+
Replies: 18
Views: 1010

Re: thinner/flusher connector for SODIMM and CM3+

Don't forget SODIMM connectors have mechanical retention on the SIDE of the module, so you would need to look at that as well


/Andy
by RattusRattus
Sat Sep 19, 2020 5:56 pm
Forum: Troubleshooting
Topic: ACR122U
Replies: 5
Views: 728

Re: ACR122U

looks like your nfc reader isn't being recognised.

what does

Code: Select all

lsusb
say?

/Andy
by RattusRattus
Fri Sep 18, 2020 5:53 pm
Forum: Beginners
Topic: Serial mystery....
Replies: 6
Views: 336

Re: Serial mystery....

Hi Martin It is entirely possible that yes they have just used USB socket for power only. I guess you can take it apart and buzz out where the lines go. if it really is a USB port D+ and D- lines should go through an ESD filter (may be missing for cheap stuff) and then onto the microcontroller. you ...
by RattusRattus
Fri Sep 18, 2020 3:54 pm
Forum: Beginners
Topic: How increase performance to 12mbps (ProfiBUS)?
Replies: 1
Views: 218

Re: How increase performance to 12mbps (ProfiBUS)?

Hi If I have understood your post correctly you are reading information from a serial port, and are having problems processing an incoming message before the start of the next message. The normal way to handle this is to place all incoming data into a buffer; under interrupts from the serial port ha...
by RattusRattus
Fri Sep 18, 2020 3:32 pm
Forum: Beginners
Topic: Serial mystery....
Replies: 6
Views: 336

Re: Serial mystery....

You need to provide more than "I have brought a thing and I don't know how to use it" (1) What is is? Make Model Supplier weblink etc (2) What is it supposed to do? It is a battery monitor sure, but describe it a bit better, what information is SUPPOSED to be presented on these magic two p...
by RattusRattus
Mon Sep 14, 2020 6:58 am
Forum: Troubleshooting
Topic: Problem powering up H-Bridge
Replies: 6
Views: 257

Re: Problem powering up H-Bridge

Many thanks for the drawing - they ALWAYS help :-) (1) Just to be 100% clear, your cables between the H-Bridges and Arduinos - they do contain a ground connection? (2) can you check the 'step-down' power supply: (2a) What is its output current rating? (2b) Is this a floating isolated power supply (i...
by RattusRattus
Sun Sep 13, 2020 7:18 pm
Forum: Troubleshooting
Topic: Problem powering up H-Bridge
Replies: 6
Views: 257

Re: Problem powering up H-Bridge

Hi there,

Please draw a diagram of what is connected and where

Please also show the power and ground connections

Thanks

/Andy
by RattusRattus
Sat Sep 12, 2020 4:40 pm
Forum: Beginners
Topic: create asd image of my raspbian os
Replies: 6
Views: 368

Re: create asd image of my raspbian os

Hi there In your pc you say the whole of the uSD card showes up as SDD So simply change if=/dev/sd b to if=dev/sd d you may want to add some additional options to your invocation of 'dd': bs=4M (set read and write block size to 4 Megabytes - this speeds up the whole process) status=progress (shows p...
by RattusRattus
Sat Sep 12, 2020 4:29 pm
Forum: Advanced users
Topic: How do I boot other OS from USB.
Replies: 1
Views: 221

Re: How do I boot other OS from USB.

Put an RPi build of EDK_2 on a uSD card this will give a functioning EUFI environment [0] You can then boot any of the normal Linux distros built for ARM32/64 with their installation image on a USB device. For example you can use a standard Debian installer on your USB stick (either ARMHF or ARM64) ...

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