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by drgeoff
Thu Jul 29, 2021 11:36 pm
Forum: Advanced users
Topic: RPi4B loses Wi-Fi when DVI screen connected
Replies: 5
Views: 153

Re: RPi4B loses Wi-Fi when DVI screen connected

For certain resolutions the clock frequency of HDMI signals is in the same band as WI-Fi. Have you tried changing the Wi-Fi channel on your router or using 5 GHz rather than 2.4 GHz?
by drgeoff
Thu Jul 29, 2021 11:32 pm
Forum: Beginners
Topic: Can I solder headers with a rework station (hot air) ?
Replies: 7
Views: 234

Re: Can I solder headers with a rework station (hot air) ?

Probably can but what is wrong with a conventional soldering iron for that?
by drgeoff
Wed Jul 28, 2021 9:38 am
Forum: Advanced users
Topic: How to measure power consumption on Rasp 3B+ or 4B
Replies: 5
Views: 319

Re: How to measure power consumption on Rasp 3B+ or 4B

Get a cheap benchtop power supply with current measurement and solder up a decent lead from a good USB cable. I use one of these. https://www.ebay.co.uk/itm/322110409581?epid=1507593134&hash=item4aff46cb6d:g:j3AAAOSwrklVLmzG One of those less than US$10 in-line USB current and voltage testers c...
by drgeoff
Tue Jul 27, 2021 6:28 pm
Forum: Advanced users
Topic: How to measure power consumption on Rasp 3B+ or 4B
Replies: 5
Views: 319

Re: How to measure power consumption on Rasp 3B+ or 4B

No model of RPi is able to measure its own power consumption. You need externsl hardware to do that.
by drgeoff
Tue Jul 27, 2021 6:04 pm
Forum: Troubleshooting
Topic: Power frustration - low voltage despite good hardware
Replies: 9
Views: 272

Re: Power frustration - low voltage despite good hardware

No official RPT PSU has an output socket for a separate cable, only a plug on the end of a fixed cable. Ergo, any PSU with a socket is not an official PSU.
by drgeoff
Mon Jul 26, 2021 1:50 am
Forum: Troubleshooting
Topic: VGA-HDMI monitor issue
Replies: 5
Views: 157

Re: VGA-HDMI monitor issue

You seem confused. Monitors always have inputs. Rarely do they also have outputs. To use a VGA monitor with a RPi you need an active HDMI to VGA converter. A VGA to HDMI converter will not work. Neither will cables that only work with equipment in which the HDMI socket can be made to output VGA sign...
by drgeoff
Mon Jul 26, 2021 1:42 am
Forum: Beginners
Topic: another way of powering the Pi 4B
Replies: 8
Views: 283

Re: another way of powering the Pi 4B

MrYuri wrote:
Sun Jul 25, 2021 8:06 pm
Don't use two 5v supplies in parallel, at least not if they're of a switching kind.
I wasn't clear enough.
I will run the cables from same supply.
There will be only one power supply.
Yes you can do that.
by drgeoff
Sun Jul 25, 2021 5:29 pm
Forum: HATs and other add-ons
Topic: rpi zero with 18650 Battery hat and OTG functionnality
Replies: 3
Views: 153

Re: rpi zero with 18650 Battery hat and OTG functionnality

I read that 18650 can be charged and discharged simultaneously, so this should not be an issue. Either what you read was incorrect or you have misunderstood it or you have worded your sentence inappropriately. An 18650 (or any chargeable device) can be in one of three states. 1. No current is flowi...
by drgeoff
Sun Jul 25, 2021 4:55 pm
Forum: SDK
Topic: is the arduino support for RPI2040 better then CMAKE ????
Replies: 51
Views: 1327

Re: is the arduino support for RPI2040 better then CMAKE ????

Which one is better depends on the criteria used to assess them. Those criteria will not be constant, but depend on the relative importance of the various factors to whoever is choosing.

The Arduino method may be "Arduino official" but it is certainly not "RaspberryPi official".
by drgeoff
Sun Jul 25, 2021 4:44 pm
Forum: Troubleshooting
Topic: Rpi 4 works fine offline but crashes when connected
Replies: 2
Views: 96

Re: Rpi 4 works fine offline but crashes when connected

Any PSU with a switch in the output cable is a potential cause of the described symptoms. When the RPi is working OK do you ever see the undervoltage warning (yellow lightning symbol) at top right of screen?
by drgeoff
Sun Jul 25, 2021 4:33 pm
Forum: General discussion
Topic: Low light/night vision support?
Replies: 6
Views: 274

Re: Low light/night vision support?

I'm looking for a Pi model that supports night vision but can't seem to find any, my project will consist a Pi that uses image recognition in a any time of the day, and the recognition will probably work very poorly without supporting low light or going automatically to night mode. If no such model...
by drgeoff
Sun Jul 25, 2021 5:17 am
Forum: General discussion
Topic: Pi baker's help wanted : 2 videos to sync
Replies: 5
Views: 255

Re: Pi baker's help wanted : 2 videos to sync

A RPi is far from being the ideal way to tackle your wish. No input for any conventional standard video, no VGA output. Go find out how frame synchronisers work.

Might be more fruitful to investigate how to sync the generation of the two videos.
by drgeoff
Sat Jul 24, 2021 8:35 pm
Forum: Troubleshooting
Topic: Low voltage warning despite official power supply?
Replies: 8
Views: 268

Re: Low voltage warning despite official power supply?

An M.2 SSD does not fit my definition of a low power device.
by drgeoff
Fri Jul 23, 2021 8:06 pm
Forum: Troubleshooting
Topic: The raspberry pi stays with the green and red led without flashing.
Replies: 2
Views: 89

Re: The raspberry pi stays with the green and red led without flashing.

Hi, I need help with this: I have bought a Raspberry pi 4B, I have installed Windows OS on it (On a Kingston 128gb A1 card). When I plug it in the green and red light stay unblinking, I would appreciate if someone could help me with this :) There is no officially supported way to install any versio...
by drgeoff
Fri Jul 23, 2021 9:05 am
Forum: Troubleshooting
Topic: Pi Zero W - LED Flashing (Not boot issue)
Replies: 6
Views: 205

Re: Pi Zero W - LED Flashing (Not boot issue)

The single LED on a Zero or ZeroW combines functions of the red and green LEDs on other models. Any access to the micro-SD card will blink the LED.
by drgeoff
Thu Jul 22, 2021 10:08 pm
Forum: Troubleshooting
Topic: unfrying a raspberry pi 4 (applied 12v to 5v pin, oops)
Replies: 11
Views: 254

Re: unfrying a raspberry pi 4 (applied 12v to 5v pin, oops)

cozeulodorieso wrote:
Thu Jul 22, 2021 8:51 pm
As I understand it, the overvoltage protection diode only protects power that comes in via USB, not via the pins, but I don't really know what I'm talking about.
Your understanding of the overvoltage protection diode in a 4B is wrong. Your assessment of your knowledge is spot on.
by drgeoff
Thu Jul 22, 2021 9:44 am
Forum: Automation, sensing and robotics
Topic: PSTN Auto Dialer for alarms
Replies: 3
Views: 186

Re: PSTN Auto Dialer for alarms

Yes, connecting apparatus which has not been certified/approved to a PSTN/POTS line is illegal in many countries. The cost of getting a homebrew solution through that process would far exceed tens of years of VoIP service. For example I have outgoing only* VoIP service with Localphone in the UK. No ...
by drgeoff
Wed Jul 21, 2021 10:15 pm
Forum: Beginners
Topic: Connecting a Pi to a PC - continued
Replies: 13
Views: 648

Re: Connecting a Pi to a PC - continued

james_r wrote:
Wed Jul 21, 2021 9:50 pm
Hi,
Is this possibly, a crossover vs straight thru cable problem.
No it is not.

The ethernet port on all RPis is autosensing. You never need a crossover cable with a RPi. But it will never be the cause of a problem if you do use one.
by drgeoff
Wed Jul 21, 2021 7:40 pm
Forum: Camera board
Topic: Bit depth of JPEG and PNG Images From PiCam v2.1?
Replies: 6
Views: 273

Re: Bit depth of JPEG and PNG Images From PiCam v2.1?

Bit depth of original image (from any source, not just a PiCam) has little correlation with the file size of the JPEG or PNG compressed version.
by drgeoff
Wed Jul 21, 2021 6:38 pm
Forum: General
Topic: Is there a limitation for number of activated pins for Pico?
Replies: 8
Views: 387

Re: Is there a limitation for number of activated pins for Pico?

Odds micropython has an issue are messems, smaller than odds resistors are too week: first 9 leds can be given enough current, and there is not enough current for the next ones.... Both scenarii are speculations From https://www.raspberrypi.org/forums/viewtopic.php?p=1812826#p1812826 seems maximum ...
by drgeoff
Wed Jul 21, 2021 2:37 pm
Forum: General discussion
Topic: migrating a VS program to RPI
Replies: 21
Views: 822

Re: migrating a VS program to RPI

Visual Studio is an IDE (Integrated Development Environment). Therefore the words "VS Program" don't really make sense. Which programming language is the code written in?
by drgeoff
Wed Jul 21, 2021 10:14 am
Forum: Advanced users
Topic: Synch gpio with exact gpu clock
Replies: 4
Views: 252

Re: Synch gpio with exact gpu clock

My understanding is that both of those clocks are derived from a single crystal oscillator. If so they are always synchronised in one sense of the word.
by drgeoff
Tue Jul 20, 2021 5:47 pm
Forum: Other
Topic: PI 0 w and Kali headless install
Replies: 3
Views: 201

Re: PI 0 w and Kali headless install

charadeur wrote:
Mon Jul 19, 2021 12:49 am
The wpa_supplement.conf file reads.
country=US
ctrl_interface=DIR=/var/run/wpa_supplicant GROUP=netdev
update_config=1

network={
ssid=myssid
psk=mywifikey
key_mgmt=WPA-PSK
}
If the above is accurate there is at least one problem to fix.
by drgeoff
Tue Jul 20, 2021 12:30 pm
Forum: Beginners
Topic: Need help to connect to Wifi 'hotspot' network with username and password
Replies: 2
Views: 121

Re: Need help to connect to Wifi 'hotspot' network with username and password

You have not explicitly said you are trying to do this on a RPi. If you are, what OS are you running and what app or menu or whatever is showing the grey text? My understanding of similar hotspots is that there is no Wi-Fi security, ie the hotspot is open but when you try to use a browser to access ...
by drgeoff
Sun Jul 18, 2021 4:15 pm
Forum: Beginners
Topic: USB Power Supply
Replies: 14
Views: 556

Re: USB Power Supply

davidcoton wrote:
Sun Jul 18, 2021 10:48 am
Ah, sorry, I’d missed the two mains outlets in the photo. Yes, 15A as a carry current does make sense.
You've still got it wrong! There are 3 mains outlets. :)

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