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by mahjongg
Fri Nov 28, 2025 8:03 pm
Forum: Beginners
Topic: questions on the voltage of the 5V GPIO pin
Replies: 16
Views: 724

Re: questions on the voltage of the 5V GPIO pin

There is no such thing as a "5V GPIO pin" !

The nominal output voltage of a GPIO pin is 3.3Volt!

Voltage drop of the power supply is mainly caused by the
cable between the PSU and the RPI, that is why the oficial PSU outputs 0.1Volt extra to compensate this (5.1 Volt).

The Regulator on the RPI ...
by mahjongg
Wed Oct 29, 2025 3:43 pm
Forum: For sale
Topic: 48V Voltage Monitor HAT (Stackable)
Replies: 10
Views: 1309

Re: 48V Voltage Monitor HAT (Stackable)



True, you cannot legally call your device a HAT as each cannot have an EEPROM on it , please read the specifications for a HAT. but you CAN stack two voltage monitors if you use male/female headers for your board its just not legally a HAT, HAT's cannot be stacked!



While I hate to argue with ...
by mahjongg
Wed Oct 29, 2025 2:50 pm
Forum: For sale
Topic: 48V Voltage Monitor HAT (Stackable)
Replies: 10
Views: 1309

Re: 48V Voltage Monitor HAT (Stackable)

True, you cannot legally call your device a HAT as each cannot have an EEPROM on it , please read the specifications for a HAT. but you CAN stack two voltage monitors if you use male/female headers for your board its just not legally a HAT, HAT's cannot be stacked!
by mahjongg
Sun Oct 26, 2025 2:46 pm
Forum: Troubleshooting
Topic: [solved] Pi4B Recently Drops WiFi
Replies: 10
Views: 664

Re: [solved] Pi4B Recently Drops WiFi

Well, turns out I don't need any more ideas. Now the Pi refuses to connect via either WiFi or Ethernet. It boots, but neither network interface will establish a connection with the router. In other words, problem solved by bricking the Pi.

op asked for deletion of his fist post.
by mahjongg
Wed Oct 15, 2025 12:42 pm
Forum: Troubleshooting
Topic: small beeping sound from pi when i connect to battery
Replies: 3
Views: 288

Re: small beeping sound from pi when i connect to battery



Is the buck convertor or the pi making the beep ?


the sound is coming from the pi.


As the RPI has no component meant to produce sound (no speaker or buzzer) the comment "the sound is coming from the PI" is meaningless.

you need to find out where the sound is actually coming from! There ...
by mahjongg
Wed Oct 08, 2025 11:51 am
Forum: Raspberry Pi Connect
Topic: Connect and resolution oddity
Replies: 23
Views: 3435

Re: Connect and resolution oddity

unlocked post for OP.
by mahjongg
Tue Sep 16, 2025 11:13 pm
Forum: Beginners
Topic: No Clue, Can't Boot
Replies: 4
Views: 939

Re: No Clue, Can't Boot

You probably formatted the sd cards wrong (with ntfs, the PI expects FAT32) go to the boot problem sticky in beginners for more info
by mahjongg
Mon Apr 07, 2025 11:54 am
Forum: Troubleshooting
Topic: Raspberry Pi 3B sporadic power cycling
Replies: 1
Views: 247

Re: Raspberry Pi 3B sporadic power cycling

The output of 5.1 volt of the official PSU is NOT a "fault" but a design choice. under normal circumstances this will result in 5.0Volt at the PI's regulator, due to normal losses in the USB cable and connectors.
by mahjongg
Tue Mar 25, 2025 11:58 pm
Forum: Beginners
Topic: Laptop Screen
Replies: 9
Views: 659

Re: Laptop Screen

Nobody has ever made this working, so it is NOT do-able! sorry :(
by mahjongg
Tue Mar 04, 2025 1:55 pm
Forum: Compute Module
Topic: External Antenna connector type on CM4
Replies: 11
Views: 2139

Re: External Antenna connector type on CM4

With a gain of 3dB more than the official RPL antenna, I suspect the first of these antenna may take CM4s above the legal WiFi level in Europe. Best to check with one of your engineers at least.or you might get into trouble!
by mahjongg
Mon Nov 11, 2024 7:58 pm
Forum: Raspberry Pi OS
Topic: How to Install Linux Software on Raspberry Pi 5?
Replies: 8
Views: 19880

Re: How to Install Linux Software on Raspberry Pi 5?

Yes, you can install linux software on a raspberry PI that has raspberry PI OS installed, but you have to realise that x86 Linux applications WON'T RUN! as a raspberry PI does not have an INTEL/AMD CPU but instead uses an ARM CPU, but most applications have been re-compiled for ARM.

so you have to ...
by mahjongg
Mon Oct 21, 2024 5:10 pm
Forum: Troubleshooting
Topic: Pi not working
Replies: 15
Views: 1993

Re: Pi not working

from an earlier thread written by James: https://forums.raspberrypi.com/viewtopic.php?t=375706&hilit=warranty#p2247975
Your warranty is with the supplier, so that is where you need to go for front-line support and warranty claims. We at Raspberry Pi do NOT deal with warranty claims for products ...
by mahjongg
Thu Oct 17, 2024 2:48 pm
Forum: Français
Topic: Comment installé un Serveur Minecraft sur un Cluster de 3 Raspberry Pi
Replies: 3
Views: 1594

Re: Comment installé un Serveur Minecraft sur un Cluster de 3 Raspberry Pi

Vous ne pouvez pas supprimer vos premiers messages si d'autres ont répondu, vous ne possédez plus le fil de discussion.
by mahjongg
Fri Oct 11, 2024 4:08 pm
Forum: Other projects
Topic: Alternate power source-100W USB-C connection
Replies: 39
Views: 7708

Re: Alternate power source-100W USB-C connection

perhaps they have read the fiorum rules https://forums.raspberrypi.com/viewtopic.php?p=154684#p154684 and are afraid they will be banned if they do because of the rule "Posts that ask technical questions about competing (also ran) Raspberry Pi like boards, or that advertise for one, will be deleted ...
by mahjongg
Tue Oct 01, 2024 2:26 pm
Forum: General discussion
Topic: Do RPi's have a limited lifespan?
Replies: 27
Views: 6059

Re: Do RPi's have a limited lifespan?

IMHO the main reason for RPI's stopping working is NOT the PI itself, which cannot overheat, as it will slow down to protect itself from overheating. The most common part that stops working is the sd-card, which do have a limited lifespan, depending on their use. Every memory flash cell has a ...
by mahjongg
Sun Sep 08, 2024 5:29 pm
Forum: 日本語
Topic: リレー回路の接続数について
Replies: 2
Views: 6900

Re: リレー回路の接続数について

リレー モジュールを Raspberry PI (または Pico) で使用しようとした多くの人は、動作させるのに苦労し、直感に反する結果になることが多々あります。たとえば、オフとしてプログラムしているのに常にオンになり、モジュールではなくソフトウェアを疑うなどです。主な理由は、これらのモジュールが 5V 信号を使用する制御システム (Arduino など) で動作するように設計されており、これらのモジュールの設計者は、モジュールを 3.3V 信号で使用しようとした場合に何が起こるかを考慮しておらず、これらのモジュールの販売者も気にしていないことです ...
by mahjongg
Sat Sep 07, 2024 11:51 am
Forum: General
Topic: RP2350 Errata E9 - Pull-down lock-up
Replies: 119
Views: 27475

Re: RP2350 Errata E9 - Pull-down lock-up

dp11 wrote: ↑
Fri Sep 06, 2024 3:07 pm
 The datasheet and E9 have been updated : https://datasheets.raspberrypi.com/rp23 ... asheet.pdf
by mahjongg
Sun Sep 01, 2024 12:37 pm
Forum: General discussion
Topic: Delete my account please
Replies: 2
Views: 908

Re: Delete my account please

I can banhammer you. which has the same effect, and you have just one pos.....
by mahjongg
Sat Aug 24, 2024 8:26 pm
Forum: SDK
Topic: Typo in 'picotool'
Replies: 3
Views: 507

Re: Typo in 'picotool'

use this to contact the pictool makers.
https://www.raspberrypi.com/contact/

There is little that forum members can do about this.
by mahjongg
Sat Aug 24, 2024 8:22 pm
Forum: Raspberry Pi OS
Topic: Please remove broken mirror from mirrorbrain (2024)
Replies: 11
Views: 1159

Re: Please remove broken mirror from mirrorbrain (2024)

theofficialgman wrote: ↑
Sat Aug 24, 2024 4:55 pm
 [I do not require any further community member contact.
Then why are you here, this forum is exclusively for community member contact,
Instead contact per e-mail.
by mahjongg
Sun Aug 18, 2024 1:20 pm
Forum: HATs and other add-ons
Topic: Thought I had posted here about SSD drives ...
Replies: 7
Views: 752

Re: Thought I had posted here about SSD drives ...

Just look at the your posts option in the hamburger menu, we do not do e-mailing here much.
by mahjongg
Thu Aug 15, 2024 3:44 pm
Forum: Raspberry Pi OS
Topic: Please remove broken mirror from mirrorbrain (2024)
Replies: 11
Views: 1159

Re: Please remove broken mirror from mirrorbrain (2024)

made other moderators aware, but next time just use this link. https://www.raspberrypi.com/contact/
by mahjongg
Wed Aug 14, 2024 10:29 pm
Forum: Raspberry Pi OS
Topic: How to bind screenshot to print screen key
Replies: 7
Views: 1105

Re: How to bind screenshot to print screen key

ZeroGPT claims it is NOT written by an AI, but 100% human written, but I agree i smells "robotic" have locked it for editing and will keep an eye on it.
by mahjongg
Sat Aug 10, 2024 2:18 pm
Forum: Troubleshooting
Topic: Disable low voltage popup in Raspbian (Pi 5)
Replies: 9
Views: 1421

Re: Disable low voltage popup in Raspbian (Pi 5)

yes, even when you think it works fine, at the same time it might corrupt your sd-card content! so don't gamble it wil be fine,, and later complain that it doesn't boot "just like that".
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