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by drgeoff
Sun Nov 28, 2021 8:07 pm
Forum: General discussion
Topic: Help/Advice Wanted - Raspberry Pi 12V Marine Use Case
Replies: 5
Views: 235

Re: Help/Advice Wanted - Raspberry Pi 12V Marine Use Case

If your Fusion can play from USB drives then it is a USB host. A RPi3B(+) can only act as a USB host. USB is not a symmetrical system. On end is host and the other end is device. A host cannot connect directly to a host nor can a device connect directly to a device. So you can immediately discount u...
by drgeoff
Sat Nov 27, 2021 11:37 pm
Forum: Troubleshooting
Topic: Raspberry Pi won't boot
Replies: 3
Views: 150

Re: Raspberry Pi won't boot

I was using a Raspberry Pi to program a LED ring using Adafruit's tutorials. I was getting confused because Adafruit has several guides for programming LEDs, all with different steps! In following one tutorial, I attempted to install adafruit_blinka, but the installer seemed to be frozen. I closed ...
by drgeoff
Sat Nov 27, 2021 8:50 pm
Forum: General discussion
Topic: Raspberry voltage requirement
Replies: 17
Views: 550

Re: Raspberry voltage requirement

Those pads are relatively fragile. Too easy to rip the pad off the board if the wire gets an accidental tug. Better to use the Zero2W's 5V and 0V holes in the GPIO area, Or if you are ever going to fit header pins do that first. Then solder the power wires to those solder joints on the underside of ...
by drgeoff
Sat Nov 27, 2021 7:01 pm
Forum: General discussion
Topic: Raspberry voltage requirement
Replies: 17
Views: 550

Re: Raspberry voltage requirement

on Pi1 to Pi3 the audio circuits are powered from the normal 3V3; the Pi4 has a separate low noise 3V3 audio supply, but the published schematics do not show whether its regulator is linear or switched mode). Actually RPis from the 2B onwards have had a separate supply for the PWM audio buffer. And...
by drgeoff
Sat Nov 27, 2021 6:51 pm
Forum: General discussion
Topic: Raspberry voltage requirement
Replies: 17
Views: 550

Re: Raspberry voltage requirement

You would be amazed by the number of people claiming they hear 'better' sound with a linear power supply. There are some hifi power supplies costing around 500 euros and are intended to power streamers with only a digital output. Are those the same people that will pay £150 for a mains lead (https:...
by drgeoff
Sat Nov 27, 2021 8:39 am
Forum: General
Topic: What is the fastest way transmit byte from pico to rpi through UART?
Replies: 4
Views: 227

Re: What is the fastest way transmit byte from pico to rpi through UART?

You could try increasing the baud rate. Line 16 of uart_tx.c
by drgeoff
Thu Nov 25, 2021 4:42 pm
Forum: General discussion
Topic: Unable to find Raspberry Pi 4B for sale anywhere. Why?
Replies: 32
Views: 1016

Re: Unable to find Raspberry Pi 4B for sale anywhere. Why?

Then stop concern trolling over it! I'm not concern trolling, only interested in all the different Raspberry Pi computers and how they work. My personal opinion is that this little computer provides an opportunity for learning many things. On one hand I understand a vendor wants a parts is parts in...
by drgeoff
Thu Nov 25, 2021 9:10 am
Forum: Troubleshooting
Topic: Zero 2 W: Data USB port not working
Replies: 3
Views: 130

Re: Zero 2 W: Data USB port not working

All versions in the Zero family have a micro-USB socket. USB peripherals do not so you need some adaptor. Suspect that. Also be aware that some USB to micro-USB cables have only the two power wires and won't work as a data connection.
by drgeoff
Wed Nov 24, 2021 10:08 pm
Forum: General discussion
Topic: CEC not working anymore on raspberry pi zero.
Replies: 5
Views: 240

Re: CEC not working anymore con raspberry pi zero.

R0cket wrote:
Wed Nov 24, 2021 9:19 pm
1 hour of no TV?! Thats not possible for me to do. Any other suggetsions?
How do you manage without ever sleeping? But yes, I offer no guarantee that an hour of no TV will get the CEC working again so you are probably making a good call if you don't interrupt your viewing.
by drgeoff
Wed Nov 24, 2021 3:13 pm
Forum: MicroPython
Topic: GPIO output less than 3.3V
Replies: 11
Views: 390

Re: GPIO output less than 3.3V

What voltage do you measure if you simply set the GPIO as a HIGH output?
by drgeoff
Wed Nov 24, 2021 2:12 pm
Forum: Troubleshooting
Topic: I cannot connect to the internet after changing to static IP
Replies: 9
Views: 228

Re: I cannot connect to the internet after changing to static IP

have fun wrote:
Tue Nov 23, 2021 3:02 pm
Hi, I set the IP of the PI to static ...
Post the details of exactly what you did in your attempt to achieve that.
by drgeoff
Wed Nov 24, 2021 2:08 pm
Forum: General discussion
Topic: CEC not working anymore on raspberry pi zero.
Replies: 5
Views: 240

Re: CEC not working anymore con raspberry pi zero.

I have occasionally had CEC issues, not confined to RPi as source, which were only resolved by removing mains power to the TV for tens of minutes. Try one hour.
by drgeoff
Wed Nov 24, 2021 8:52 am
Forum: General discussion
Topic: Permanent Connection to these right-angle pins
Replies: 10
Views: 384

Re: Permanent Connection to these right-angle pins

Or solder wires to where the pins are soldered on the underside of the board.
by drgeoff
Wed Nov 24, 2021 8:45 am
Forum: Networking and servers
Topic: UDP works on Windows 7 but not RPI4
Replies: 8
Views: 285

Re: UDP works on Windows 7 but not RPI4

I have a black box that communicates via UDP. It listens for a hex array command and responds with data, serial number etc. The program is written in Python and works perfectly on a windows 7 machine running Python 3.7. I transferred the program to my Raspberry PI4, set up the static IP address (19...
by drgeoff
Tue Nov 23, 2021 10:09 pm
Forum: General discussion
Topic: Power Choices for USB C
Replies: 1
Views: 118

Re: Power Choices for USB C

The USB-C socket is rated for up to 3 Amps. Allowing up to 1.8 Amps for the 4B itself that leaves 1.2 Amps to be used by all devices plugged into the USB2 and USB3 sockets and powered from the 5 Volt pins on the GPIO header. You should be very careful about taking much current from the 3.3 Volt pins.
by drgeoff
Tue Nov 23, 2021 5:05 pm
Forum: Interfacing (DSI, CSI, I2C, etc.)
Topic: SDTV settings on the Pi Zero
Replies: 2
Views: 123

Re: SDTV settings on the Pi Zero

AIUI the overscan settings in config.txt also apply to the composite video output.
by drgeoff
Tue Nov 23, 2021 2:34 pm
Forum: Raspberry Pi 400
Topic: Second hand hardware
Replies: 4
Views: 466

Re: Second hand hardware

Not possible to answer that question given the information supplied.
by drgeoff
Tue Nov 23, 2021 2:22 pm
Forum: Beginners
Topic: Power supply for pico
Replies: 5
Views: 192

Re: Power supply for pico

Just use a USB powerbank. You probably don't need a particularly large capacity one as I guess the required run time will be relatively short. I would hope that at least one of your team has the brains to realise what info is needed and then do the calculation.
by drgeoff
Mon Nov 22, 2021 6:45 pm
Forum: General discussion
Topic: Raspi 3B+ or 4 power supply by battery
Replies: 7
Views: 285

Re: Raspi 3B+ or 4 power supply by battery

You won't damage the RPi. You probably will not do terminal damage to the powerbank. Whether the arrangement will function satisfactorily is difficult to predict. If the powerbank actually has a single step-up converter producing 5 Volts at up to 4 Amps then it should be OK. But if it has 2 coverter...
by drgeoff
Mon Nov 22, 2021 5:07 pm
Forum: General discussion
Topic: The crystal oscillator of Pi 4B
Replies: 16
Views: 582

Re: The crystal oscillator of Pi 4B

Short term or long term stability? Temperature dependency and aging atop initial accuracy.
by drgeoff
Mon Nov 22, 2021 12:11 am
Forum: General discussion
Topic: Hard Reset on pi Zero 2 W
Replies: 8
Views: 319

Re: Hard Reset on pi Zero 2 W

cleverca22 wrote:
Mon Nov 22, 2021 12:01 am
RUN is now a test-point on the other side of the board, check under the hdmi connector
No that is where the composite video (TV) pad is. The RUN pad is in the diagonally opposite corner near the GPIO pin hole 39. See the photo linked in my post above.
by drgeoff
Mon Nov 22, 2021 12:02 am
Forum: Beginners
Topic: Resister Values
Replies: 31
Views: 846

Re: Resister Values

Using a typical signal generator as source the polarised capacitor is probably the wrong way round in theory. Though for the circuit to work the voltage across it will be quite small.
by drgeoff
Sun Nov 21, 2021 11:56 pm
Forum: General discussion
Topic: Hard Reset on pi Zero 2 W
Replies: 8
Views: 319

Re: Hard Reset on pi Zero 2 W

There are no RUN holes on a Zero2W. But there are labelled pads on the underside. Same change for the composite video out.

Photos at https://eji4evk5kxx.exactdn.com/wp-cont ... sy=1&ssl=1
by drgeoff
Sun Nov 21, 2021 5:58 pm
Forum: Compute Module
Topic: Keep loosing 2.4GHz after updates on Bullseye
Replies: 9
Views: 344

Re: Keep loosing 2.4GHz after updates on Bullseye

Well, just came home and out of curiosity plugged in my ALFA usb wifi adapter and it works fine. It is plugged in with a foot long usb cable and connected right away to my 2.4GHz network side. So i guess it is not usb interference??? Is your alfa usb wifi adapter usb 3? I suspect not. No, but it pl...
by drgeoff
Sun Nov 21, 2021 5:52 pm
Forum: General discussion
Topic: Apple TV 3 Connector Model Numbers with CM4
Replies: 4
Views: 199

Re: Apple TV 3 Connector Model Numbers with CM4

Still trying to get 7 Watts from a 6 Watt PSU?

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