cmnybo
@cmnybo@discuss.tchncs.de
- Comment on What use a smart card reader? 9 hours ago:
You could get a bunch of the cheap EEPROM type smart cards and use them to launch programs or play music or something.
- Comment on Get ready to see ads on your… Samsung refrigerator 10 hours ago:
Yeah, there’s no way I’m buying an internet connected fridge with a giant screen.
- Comment on Campaigners urge EU to mandate 15 years of OS updates 22 hours ago:
Just require any new operating systems to support 15 year old hardware. We should require manufacturers to provide 15 years of UEFI and firmware updates too.
- Comment on Researchers embed digital 'fingerprints' into 3D printed parts — tech may make future ghost guns more traceable 1 day ago:
Luckily we have open source firmware and we can build our own printers.
Most ghost guns are not 3D printed so this is nothing but security theater and an invasion of privacy.
- Comment on Ender 3 V2 Causing Circuit Breaker to Trip (Even when PSU is flipped off!) 1 day ago:
It’s pretty common to have breakers with built in GFCI these days.
- Comment on Ender 3 V2 Causing Circuit Breaker to Trip (Even when PSU is flipped off!) 2 days ago:
Earth leakage would only trip the breaker if it was a GFCI, so the problem is something else.
- Comment on Ender 3 V2 Causing Circuit Breaker to Trip (Even when PSU is flipped off!) 2 days ago:
Is it plugged into a GFCI protected outlet?
The power supply will have RFI filters in it and they always have some leakage. They may be installed before the power switch. There could just be too many devices with some earth leakage connected to the circuit, causing it to trip without any of them being faulty.
- Comment on 3 days ago:
They used 6 bit encoding for the text, so the drive stored around 5 million characters which would be around 2500-3000 pages of text.
For the break even point you also have to consider how much time it takes to find and access a file and how much time it takes to edit it.
- Comment on What would stop you from switching to a flip phone (or dumbphone) in 2025? 3 days ago:
Any decent password manager should handle generating TOTP codes. A phone is not needed for that.
- Comment on California could mandate tobacco-style health labels on social media 4 days ago:
There’s a huge difference between e-mail and a site that is specifically designed to keep people addicted.
The warning won’t do anything though. I would be surprised if it takes more than a day before ublock origin has a filter to hide it.
- Comment on [deleted] 5 days ago:
I haven’t really noticed any obvious bot activity, at least in the communities that I’m subscribed to. I’m sure there is probably some, but it’s nothing like reddit.
- Comment on Proton Mail Suspended Journalist Accounts at Request of Cybersecurity Agency 5 days ago:
There aren’t many VPN providers that have port forwarding and allow P2P. Proton is about the only choice if you want to seed.
- Comment on Roku wants you to see a lot more AI-generated ads 5 days ago:
I will never buy any of their devices. I prefer to self host my own ad free streaming using open source software.
- Comment on Spotify adds lossless streaming after 8 years of teasing 1 week ago:
Higher resolutions and sample rates only matter when the recordings are going to be edited.
- Comment on E-Paper Display Reaches the Realm of LCD Screens 1 week ago:
It’s certainly not the first e-paper display that’s fast enough for computer use. Dasung has had 60Hz greyscale and 30Hz color monitors available for a while now.
- Comment on Google admits the open web is in ‘rapid decline’ 1 week ago:
It’s not entirely their fault. The AI companies share a good portion of the blame too.
- Comment on Choosing my first printer is driving me mad. 1 week ago:
Printing services are not good if you’re designing your own parts and need to make test prints to get things to fit. It will take a month or more instead of a day to go through several iterations and cost a lot of money too.
- Comment on Forgejo fills up hard drive with repo-archives 1 week ago:
Are you using anything to defend against bots?
- Comment on Google's plan to restrict sideloading on Android has a potential escape hatch for users 1 week ago:
We already have to do that to install older apps. It’s inconvenient, but not as bad as having to boot up an ancient phone every time you need to use the app.
- Comment on Current limiting 1 week ago:
The other ranges connect exactly the same.
- Comment on Current limiting 1 week ago:
Yes, that is wired correctly.
Did you get the 5 amp current sensor or the 30? The higher current ones output less voltage per amp, which will make it harder to measure small currents.
- Comment on UK government trial of Microsoft's M365 Copilot finds no clear productivity boost 1 week ago:
People probably tried it, found out that it’s crap and stopped using it.
- Comment on Current limiting 1 week ago:
The sense output from the op amp connects directly to an ADC input. The output is 1 volt per amp. If sense_a is already connected to ground, you will have to disconnect it.
The hall effect current sensor will work fine too. They do tend to have an offset, but you can calibrate that out in software. Just take a reading when the motor is off and subtract it from the reading when the motor is on. If you do use the hall effect sensor, you could connect it between sense_a and ground so it will only measure the motor current.
- Comment on Current limiting 1 week ago:
A current shunt is a resistor that can handle the full current of the motor. You would probably want a 0.1Ω resistor rated for at least 1 watt.
You measure the voltage drop across it to determine the current. The voltage will be quite low. With a 0.1Ω resistor and a 2A load, it will be 0.2V. You want to amplify that up closer to the full scale input of the ADC to get a decent resolution. An op amp with a gain of 10 would work well for that. Use a rail to rail op amp that can run from the 3.3V power supply.
Here is a schematic:
SchematicR4, D1 & D2 protect the op amp input from any spikes the motor produces.
- Comment on Roblox continues efforts for child safety by expanding age estimation to all users by end of the year 1 week ago:
Luanti is significantly lighter weight than modern versions of Minecraft. It doesn’t need a dedicated GPU and will run on almost anything.
- Comment on Current limiting 1 week ago:
The L298 has two sense pins. Connect a current shunt between each sense pin and ground and you can measure the motor current. Use an op amp to amplify it and measure it with the ADC in the microcontroller. The microcontroller can stop the motor if the current gets too high.
- Comment on 18% of people running Nextcloud don't know what database they are using 1 week ago:
FAT32 is still a very common filesystem for flash drives and memory cards because it works on everything. Lots of people are likely to run into the 4GB file size limit.
- Comment on Big Surprise—Nobody Wants 8K TVs 2 weeks ago:
Yeah, as long as they don’t discontinue them.
- Comment on Big Surprise—Nobody Wants 8K TVs 2 weeks ago:
I would much rather have 1080p content at a high enough bitrate that compression artifacts are not noticeable.
- Comment on Ooni Volt 2 - they put "AI" in a pizza oven 2 weeks ago:
If it doesn’t burn wood, then it’s not a pizza oven.
