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by wolf.z
Fri May 21, 2021 3:22 pm
Forum: HATs and other add-ons
Topic: Definitive working guide for setting up a GPS time server?
Replies: 5
Views: 1721

Re: Definitive working guide for setting up a GPS time server?

...Are there any guides that work for you with the latest Raspberry Pi OS Buster?.... As said befor, setting up NTP is quite generic. However, for making the PPS signal the No1 time source you possibly have to give it a time offset. Otherwise, distant servers will often win in an offset competition...
by wolf.z
Wed May 19, 2021 7:04 pm
Forum: Beginners
Topic: hwclock and NTP
Replies: 5
Views: 511

Re: hwclock and NTP

...You are not running a time source so WolfZ comment is irrelevant. Concerning the very thread starting question, it is not. .... I installed NTP some time ago. I think that is the problem. Is there a way to get the system to use the hardware clock I installed if no web connection is available?......
by wolf.z
Mon May 17, 2021 3:22 pm
Forum: Advanced users
Topic: frame rate dropping substantially when servo motor introduced
Replies: 3
Views: 308

Re: frame rate dropping substantially when servo motor introduced

I'm afraid, you provided too little information.

Assuming, your servo controller is connected via UART, you might face an interrupt handling / OpenCV realtime operation conflict.

But it's just guessing....
by wolf.z
Mon May 17, 2021 3:12 pm
Forum: Other projects
Topic: Chosing power supply for my aeromodel project
Replies: 2
Views: 661

Re: Chosing power supply for my aeromodel project

Not sure, whether I understood the problem. Assuming, you want power for several 5V devices power for 12V devices why would that stress a Raspberry? Use a switching BEC, 3A minimum for both the 5V supply. and another switching BEC for the 12V supply. Cheap switching BEC typically do a step-down DC-D...
by wolf.z
Mon May 17, 2021 2:49 pm
Forum: Beginners
Topic: hwclock and NTP
Replies: 5
Views: 511

Re: hwclock and NTP

...If you have NTP installed too then it will just take over when it starts and keep the system clock accurate. Not necessarily with the rtc clock. Learn about NTP synchronisation and make sure, you have configured NTP driver Type1, "Undisciplined Local Clock (LOCAL)" after having underst...
by wolf.z
Mon May 10, 2021 3:36 pm
Forum: Troubleshooting
Topic: Pi 3B won't connect to WiFi, but wlan0 shows my SSID
Replies: 16
Views: 1225

Re: Pi 3B won't connect to WiFi, but wlan0 shows my SSID

So many possibilities. Just one:
Typical pity is to allow connect for known hardware adresses only. Check config on your router. In case, disable for very first connect, after enable again.
by wolf.z
Fri Apr 23, 2021 5:19 pm
Forum: Troubleshooting
Topic: DNS stopped working
Replies: 16
Views: 1549

Re: DNS stopped working

Maybe some other magic is happening. That happended to me: I definitely cannot explain what happened, but after assumed too much trys and changes of my MacBook's nework configuration by myself it could not get any IP from my router any more. Later, an assumed timeout on the router lets me reconnect ...
by wolf.z
Fri Apr 23, 2021 5:03 pm
Forum: Beginners
Topic: High pitched noise from board when grounded via GPIO?
Replies: 8
Views: 515

Re: High pitched noise from board when grounded via GPIO?

Quite unlikely. The driver for those LEDs usually clocks at 800kHz. A bit too high for most ears. Although it could be a sub- harmonic. FTFY. Still rather unlikely. Possibly a modulation product from mixing with a similar frequency signal. Well, to be more precise. The sound is neither the converte...
by wolf.z
Thu Apr 22, 2021 7:39 pm
Forum: Beginners
Topic: High pitched noise from board when grounded via GPIO?
Replies: 8
Views: 515

Re: High pitched noise from board when grounded via GPIO?

From BoyOh I think what you are hearing is a 100Hz uk 120hz usa noise hum from your power supply You said you fitted a 1000uF capacitor , Might you have fitted it in the wrong position It want's fitting on the power supply Full wave bridge out / Put to Smoothe the 100Hz ripple. Before the Regulator...
by wolf.z
Mon Apr 19, 2021 6:50 pm
Forum: Troubleshooting
Topic: My RPI 4 is damaging my Sd Cards
Replies: 14
Views: 1024

Re: My RPI 4 is damaging my Sd Cards

Sadly there is much too many reasons, another SD Card could develop the very same problems as a first one. It might be the case: You just bought bad SD cards and try to succeed with different cards from the same bad batch - likely You do not shutdown your Pi before power off causing corrupted filesy...
by wolf.z
Wed Apr 14, 2021 11:11 am
Forum: Beginners
Topic: VCR converter
Replies: 3
Views: 191

Re: VCR converter

Seems like too little information you provided. To just start with the hardware, you might have done something wrong. A standard colour scheme of analogue video cabling is red: audio right channel white: audio left channel yellow: video composite signal Thus, you might miss any video hardware link. ...
by wolf.z
Sun Apr 12, 2020 7:59 pm
Forum: Troubleshooting
Topic: systemd-timesyncd DNS lookup fails if DHCP slow
Replies: 4
Views: 468

Re: systemd-timesyncd DNS lookup fails if DHCP slow

Well, a long time ago, I wasted pretty much of my lifetime in figuring out, I was facing a severe NTPD bug. The last thing I dared to think of, was a bug in the NTP implementation. At that time, there was a 4h window in the gpsd driver defined for jumping (instantly stepping ntp) rather than slewing...
by wolf.z
Tue Apr 07, 2020 7:49 pm
Forum: General discussion
Topic: Operation Voltage
Replies: 10
Views: 760

Re: Operation Voltage

Supplement: A voltage drop from about 0.6 Volt @ 0.85A as Moahrs reports, points to either very thin cables or a voltage regulator, far too weak for supplying everything. Even if two separate recommended regulators will get in charge, there is a chance, things will not work as expected, since the mo...
by wolf.z
Fri Mar 20, 2020 9:14 pm
Forum: Advanced users
Topic: Raspberry Pi 4 External Wifi Antenna
Replies: 17
Views: 39042

Re: Raspberry Pi 4 External Wifi Antenna

...If Notupus is a licensed Amateur radio operator. He could go on channel 1 (2.4GHz) setup a MESH node and transmit 1.5Kw (the max allowed). Possible (yes), Probable (not) So good to know, that there is more room for Radio Amateurs pumping up the electro magnetical spectral power densitiy. If Notu...
by wolf.z
Fri Mar 13, 2020 9:12 pm
Forum: Advanced users
Topic: Raspberry Pi 4 External Wifi Antenna
Replies: 17
Views: 39042

Re: Raspberry Pi 4 External Wifi Antenna

Where did you find the spec saying Pi4B has 31dBm transmit power? However, By modifying any radio device its EU or FCC approval will most likely loose validity. When buying a radio with an antenna connector, you are allowed to change the antenna in effect and will not loose approval. With a directio...
by wolf.z
Fri Feb 07, 2020 7:16 pm
Forum: General discussion
Topic: Options for 5GHz settings
Replies: 5
Views: 993

Re: Options for 5GHz settings

Well, let me put it that way. In order to get meaningful results for your strength tests, you have to have a deep understanding of what which radio standard does do. In case, you do know, what IEEE 802.11 a, b, g, n, ac, ax is / what OFDM is / what MIMO is / what frequency hopping, multiple path pro...
by wolf.z
Wed Feb 05, 2020 5:51 pm
Forum: General discussion
Topic: Options for 5GHz settings
Replies: 5
Views: 993

Re: Options for 5GHz settings

Dear Blondie 22, maybe it is a good idea to provide more info. I guess, you soon will get answers. What Pi with what OS are you using? Where did you search for infomation not found? Did you already try to manage network settings? If so, did you try to edit system files or did you try via GUI? Networ...
by wolf.z
Tue Jan 21, 2020 6:44 pm
Forum: General discussion
Topic: Putty Alternative For Mac User
Replies: 11
Views: 2191

Re: Putty Alternative For Mac User

Well, let me put it that way: Putty is an app for doing genuine **nix stuff on a Windows OS. So why not try the onboard MacOS terminal?

In any case of need for more, try this: https://thegeekpage.com/putty-alternative-for-mac-os/
by wolf.z
Fri Jan 17, 2020 10:00 pm
Forum: Beginners
Topic: Unable to connect from Mac to Raspberry Pi4 using SSH
Replies: 7
Views: 598

Re: Unable to connect from Mac to Raspberry Pi4 using SSH

Mmmmh, maybe you should give the exact syntax of the ssh command you are using plus the users you set up on the Pi?
by wolf.z
Fri Jan 17, 2020 9:55 pm
Forum: Beginners
Topic: Access Point & Pihole on the same unit
Replies: 5
Views: 3550

Re: Access Point & Pihole on the same unit

I haven't done this yet but there can't be too much of a problem. Choose the red pill described in this guide: https://blog.cryptoaustralia.org.au/instructions-for-setting-up-pi-hole/ For making the Pi act as an access point, follow this doc: https://www.raspberrypi.org/documentation/configuration/w...
by wolf.z
Thu Jan 16, 2020 7:28 pm
Forum: Beginners
Topic: Access Point & Pihole on the same unit
Replies: 5
Views: 3550

Re: Access Point & Pihole on the same unit

Well, Pihole basically is a DNS Server, able to act as a DHCP server as well. Everything else needed is an ethernet-WLAN bridge. I am pretty sure, even a Pi2 will do the job. On the downside a Pi typically will not achieve datarates of modern wlan routers with MIMO and beamforming. I am afraid, your...
by wolf.z
Wed Jan 15, 2020 10:29 am
Forum: General discussion
Topic: Raspberry pi 4 cluster
Replies: 14
Views: 1632

Re: Raspberry pi 4 cluster

... Certainly USB networking is potentially faster than Ethernet, as long as you use USB3 on the Pi4B. However, you need some hardware in between to allow to USB hosts to talk to each other (AFAIK). Using an Ethernet cable for two Pis needs just that -- one cable. You have to give both of them stat...
by wolf.z
Wed Jan 15, 2020 7:12 am
Forum: General discussion
Topic: Raspberry pi 4 cluster
Replies: 14
Views: 1632

Re: Raspberry pi 4 cluster

... My question is: ... 2. Do you know any good method to join only 2 raspberry? ... From a minimalist's point of view, I like the idea of networking via USB. Since I had no application to run for, I can't report on what preformance you might expect, but you may spare the ethernet hub when networki...
by wolf.z
Mon Dec 16, 2019 8:08 pm
Forum: Beginners
Topic: How can I shrink Raspbian main partition by maximum before backup?
Replies: 6
Views: 4120

Re: How can I shrink Raspbian main partition by maximum before backup?

You are asking for shrinking partitions, then backup. Why not going the other way round, since any repartitioning draws some risk?
Have a look at rpi-clone for cloning and fitting partitions without.
For shrinking even more, give pishrink a try.

And leave your source partition unaltered..
by wolf.z
Mon Dec 16, 2019 7:19 pm
Forum: Beginners
Topic: How to power a Raspberry Pi and servo motors with one power supply
Replies: 4
Views: 614

Re: How to power a Raspberry Pi and servo motors with one power supply

Hmm, some more details would be quite helpfully. That said, e.g. the servo as well as the motor driver hat from waveshare suggest to provide a 5 Volt voltage converter, fed by the 6-12Volt Battery In.

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