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by drgeoff
Tue Aug 13, 2019 1:58 pm
Forum: General discussion
Topic: 'Sniffing' Serial Commands?
Replies: 25
Views: 719

Re: 'Sniffing' Serial Commands?

You should get hands on something like this https://www.saleae.com/ I'll second this. I've had several since they first came out. Best serial troubleshooting tool I've ever owned. Or get a <$10 clone ("8 ch 24 MHz logic analyzer") from ebay and the Sigrok open source software. https://sigrok.org/wi...
by drgeoff
Mon Aug 12, 2019 6:50 pm
Forum: Beginners
Topic: Can’t ssh into raspberry Pi Zero
Replies: 10
Views: 277

Re: Can’t ssh into raspberry Pi Zero

The file should be named ssh, not ssh.txt See section 3: https://www.raspberrypi.org/documentation/remote-access/ssh/README.md /Mogens FYI. ssh.txt also works. That was done because so many people had file extensions set to 'not shown' in Windows File Explorer and did not realise the file they had ...
by drgeoff
Sun Aug 11, 2019 7:01 pm
Forum: General discussion
Topic: Raspberry Pi 4 Power solution
Replies: 7
Views: 327

Re: Raspberry Pi 4 Power solution

That recommended 3 Amp figure includes up to 1.2 Amp for peripherals and add-ons. Do the maths for your specific situation.
by drgeoff
Sun Aug 11, 2019 6:56 pm
Forum: Other
Topic: Can't turn on the Bluetooth on Kali Linux
Replies: 5
Views: 409

Re: Can't turn on the Bluetooth on Kali Linux

Questions about Kali are best asked on its own forum.

https://forums.kali.org/forumdisplay.ph ... chitecture
by drgeoff
Sun Aug 11, 2019 6:03 pm
Forum: Troubleshooting
Topic: Red Battery icon - Discharging%
Replies: 11
Views: 1664

Re: Red Battery icon - Discharging%

chiques wrote:
Sun Aug 11, 2019 5:54 pm
A voltage indicator would be more useful.
An indicator is already provided - the yellow lightning bolt when voltage is low.
by drgeoff
Sun Aug 11, 2019 5:54 pm
Forum: Beginners
Topic: Running multiple apps on PI
Replies: 9
Views: 209

Re: Running multiple apps on PI

It is quite possible that all the UPS circuitry, even the indicators, is NOT mains-isolated. In such a case a direct electrical connection to the indicator circuit could prove fatal to human (or animal) life. General rule when mains is involved. If you don't fully understand what you are doing or ne...
by drgeoff
Sun Aug 11, 2019 1:45 pm
Forum: Troubleshooting
Topic: Issues with gpio
Replies: 7
Views: 190

Re: Issues with gpio

Remotes with more than a few buttons often use a matrix arrangement. For those, you cannot emulate key presses by a simple pull to ground.
by drgeoff
Sun Aug 11, 2019 10:42 am
Forum: Other projects
Topic: Homemade airfryer
Replies: 9
Views: 391

Re: Controlling a premade appliance?

Any decent air-fryer should have safety mechanisms eg to prevent dangerous overheating if fan or thermostat fails. Be sure that your homebrew version has similar or your mods to a premade one do not compromise them. And sorry to be blunt but "a bachelor's degree in computer hardware engineering", ev...
by drgeoff
Sun Aug 11, 2019 10:29 am
Forum: Off topic discussion
Topic: Longest Raspberry Pi uptime
Replies: 90
Views: 53962

Re: Longest Raspberry Pi uptime

Andyroo wrote:
Sat Aug 10, 2019 8:08 pm
drgeoff wrote:
Fri Aug 09, 2019 7:03 pm
...
Methinks that's far from being a "national power outage".
No - some folk in London where impacted so that makes it national from their / the news point of view... The just do not understand things south of Watford :lol:
3 errors/typos in that. Was it a rushed reply?
by drgeoff
Sun Aug 11, 2019 10:24 am
Forum: General discussion
Topic: Protect over voltage on Voltage Divider ciruit
Replies: 12
Views: 293

Re: Protect over voltage on Voltage Divider ciruit

What ADC? No mention in this thread of an ADC until trejan's post. If they want to know the exact voltage then they'd need one. If they're happy with knowing they're just over some preset voltage then no. The threshold voltage on a RPi GPIO is not sufficiently well defined to know with certainty if...
by drgeoff
Sun Aug 11, 2019 10:05 am
Forum: General discussion
Topic: When are people in the U.S. getting their Pi 4s?
Replies: 160
Views: 7992

Re: When are people in the U.S. getting their Pi 4s?

Sigh! Is there no end to these "know-it-alls" who actually know very little?
by drgeoff
Sun Aug 11, 2019 9:57 am
Forum: General discussion
Topic: Protect over voltage on Voltage Divider ciruit
Replies: 12
Views: 293

Re: Protect over voltage on Voltage Divider ciruit

trejan wrote:
Sun Aug 11, 2019 2:05 am
Use bigger value resistors as you'll be dissipating ~10mA across your voltage divider with your current selection. You may need a 10-100nF ceramic cap from the ADC input to ground as well.
What ADC? No mention in this thread of an ADC until trejan's post.
by drgeoff
Sat Aug 10, 2019 7:48 pm
Forum: General discussion
Topic: USB power supply to power 4x Pi 4B cluster
Replies: 8
Views: 375

Re: USB power supply to power 4x Pi 4B cluster

That "Smart Voltage" paragraph is marketing mumbo-jumbo. There is no way that a PSU can compensate for voltage drop in an unknown cable without having an extra pair of sense wires connected to the non-PSU end of the cable.
by drgeoff
Sat Aug 10, 2019 6:22 pm
Forum: General discussion
Topic: battery questions
Replies: 4
Views: 142

Re: battery questions

The Powerboost 1000 is not really up to the demands of a RPi4B.
by drgeoff
Sat Aug 10, 2019 6:21 pm
Forum: General discussion
Topic: When are people in the U.S. getting their Pi 4s?
Replies: 160
Views: 7992

Re: When are people in the U.S. getting their Pi 4s?

I think it would be more accurate to say that RS and Farnell are the ones ordering and stumping up the money to have most (not all) of the RPi models manufactured under licence from RPF or RPT. I don't know what manufacturing facilities those two companies have in-house but it is well known that man...
by drgeoff
Sat Aug 10, 2019 4:50 pm
Forum: Beginners
Topic: Pi Zero W dead?
Replies: 5
Views: 168

Re: Pi Zero W dead?

Just in case. The USB test requires the cable be plugged in to the micro-USB socket nearest the mini-HDMI socket.
by drgeoff
Sat Aug 10, 2019 4:03 pm
Forum: Troubleshooting
Topic: Can't SSH outside LAN despite port forwarding
Replies: 6
Views: 192

Re: Can't SSH outside LAN despite port forwarding

Are you trying to test using your public IP address from a device on the same LAN as the RPi? Some routers don't support that - hairpinning.

If yes to that question, try from elsewhere or from a device connected to the internet over 3G/4G mobile network.
by drgeoff
Sat Aug 10, 2019 2:13 pm
Forum: Beginners
Topic: microSD card size?
Replies: 17
Views: 490

Re: microSD card size?

Hi, I’m waiting for my Raspberry Pi4 4Go, I m a newbie... My question, is it possible to install Buster on formated exfat sd 16gb or more? Fat is limited with files size. I prefer exfat. Is it possible? Only a small partition (about 250 Mbyte) on the card will be FAT and Linux will not normally sto...
by drgeoff
Sat Aug 10, 2019 9:04 am
Forum: Troubleshooting
Topic: Software solution screen dimmer available?
Replies: 11
Views: 270

Re: Screen add on, Screen dimmer available?

Has your screen the hardware which allows for dimming? Most likely it's backlight is simply connected to VCC for max brightness. The indignant OP has not answered this question. All software solutions require hardware support. If the backlight does not have controllable hardware then there is no wa...
by drgeoff
Sat Aug 10, 2019 8:58 am
Forum: Troubleshooting
Topic: RPi3B+ connecting to WAP(on phone) but no internet
Replies: 6
Views: 79

Re: RPi3B+ connecting to WAP(on phone) but no internet

When you set static IP on the RPi did you also make correct settings for gateway and DNS?
by drgeoff
Sat Aug 10, 2019 8:51 am
Forum: Beginners
Topic: microSD card size?
Replies: 17
Views: 490

Re: microSD card size?

Think I remember reading that if DD is used to place an image on the card there is a size limit. If etcher is used that limit is eliminated. The problem is if you try to *copy* NOOBS with a Windows or Mac system without first reformatting any SD card larger than 32GB. Larger cards are formatted in ...
by drgeoff
Sat Aug 10, 2019 8:41 am
Forum: General discussion
Topic: Protect over voltage on Voltage Divider ciruit
Replies: 12
Views: 293

Re: Protect over voltage on Voltage Divider ciruit

Or put a 2.7 volt zener diode across R2.
by drgeoff
Fri Aug 09, 2019 11:53 pm
Forum: Beginners
Topic: microSD card size?
Replies: 17
Views: 490

Re: microSD card size?

nmrider66 wrote:
Fri Aug 09, 2019 11:28 pm
Think I remember reading that if DD is used to place an image on the card there is a size limit. If etcher is used that limit is eliminated.

Is my memory working?
About that, at least, your memory is not working.

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