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by Tzarls
Thu Jul 04, 2019 10:29 pm
Forum: General discussion
Topic: Raspberry Pi 4 usb boot?
Replies: 304
Views: 48565

Re: Raspberry Pi 4 usb boot?

James, you and your colleagues are doing a wonderful job but please don't feed the trolls. On the contrary, this is where the fun begins. The product has been in the wild for [checks notes] 10 days now and we're frankly disappointed about the quality of the troll armada that has followed this Pi re...
by Tzarls
Tue Jul 02, 2019 6:53 pm
Forum: Off topic discussion
Topic: Help with this circuit
Replies: 4
Views: 579

Re: Help with this circuit

Replace the 10k with zero resistance link, that's what I meant with "remove".

Thank you, I can go on with my project now. :)
by Tzarls
Tue Jul 02, 2019 7:16 am
Forum: Off topic discussion
Topic: Help with this circuit
Replies: 4
Views: 579

Re: Help with this circuit

Great, thanks for your answer. And what would happen if Opto's emitter was at battery voltage? In other words, what would happen if I removed the 10k resistor? Would it still work?
by Tzarls
Tue Jul 02, 2019 6:53 am
Forum: Off topic discussion
Topic: Help with this circuit
Replies: 4
Views: 579

Help with this circuit

Hi guys. I´m looking for help analyzing this circuit: (simple drawing) https://www.dropbox.com/s/rijqpf96i4fxhtn/optocircuit.png?dl=0 - Batt is putting out 5V (actually it's less than that but just say 5V to make thing simpler for now) - Grounds are tied (but I gues it would still work if they weren...
by Tzarls
Mon Jun 10, 2019 4:07 pm
Forum: General discussion
Topic: Pi Zero W as Bluetooth Dongle to inspect Bluetooth traffic
Replies: 6
Views: 409

Re: Pi Zero W as Bluetooth Dongle to inspect Bluetooth traffic

Yes, and the project seems to have some bad comments.

Thanks anyway, let's see if someone else knows how to achieve what I want.
by Tzarls
Fri May 17, 2019 1:06 pm
Forum: General discussion
Topic: Pi Zero W as Bluetooth Dongle to inspect Bluetooth traffic
Replies: 6
Views: 409

Re: Pi Zero W as Bluetooth Dongle to inspect Bluetooth traffic

But I don't need to actually sniff packets off the air. The idea is to have the robot connect directly to the Pi, which would be acting as the Windows PC's bluetooth adapter. In reality this would be more like a MITM thing than actual sniffing.
by Tzarls
Fri May 17, 2019 7:17 am
Forum: General discussion
Topic: Pi Zero W as Bluetooth Dongle to inspect Bluetooth traffic
Replies: 6
Views: 409

Pi Zero W as Bluetooth Dongle to inspect Bluetooth traffic

Hi. I have this small "robot" which can be programmed using Scratch 2 on Windows with some extensions made by the manufacturer. The robot connects to the computer using Bluetooth. I had the idea that, if I could inspect the messages sent from and to the robot I could make a Python API to program it ...
by Tzarls
Thu Mar 28, 2019 12:17 pm
Forum: General discussion
Topic: Pi 4 questions
Replies: 166
Views: 9947

Re: Pi 4 questions

Since the only thing we know for sure about the Pi4, or Pi5, or Pi6 is that price will be 35$...can I pre-order right now? Coumt me as first in line, others can stand behind me. 😁
by Tzarls
Mon Mar 18, 2019 2:45 am
Forum: General programming discussion
Topic: Mixing C and assembly?
Replies: 18
Views: 1875

Re: Mixing C and assembly?

A few years ago I got involved in porting some software to the Raspberry Pi, and had to investigate how function arguments and returns work in assembly - learnt a lot about r, s and d registers. The whole discussiones and work progress is documented here: https://www.gamedev.net/forums/topic/634187-...
by Tzarls
Sat Mar 16, 2019 10:50 pm
Forum: General discussion
Topic: design of a generic raspberry pi 3 form factor open source notebook cabinet?
Replies: 18
Views: 1440

Re: design of a generic raspberry pi 3 form factor open source notebook cabinet?

Such "cabinet" exists:

http://www.wawaperu.org/

I've seen it working with a Raspberry Pi and at least one iother kind of SBC.
by Tzarls
Wed Jan 16, 2019 10:48 pm
Forum: Advanced users
Topic: Raspberry PI cold boot attack protected / Zero out RAM after boot?
Replies: 71
Views: 4859

Re: Raspberry PI cold boot attack protected / Zero out RAM after boot?

Another idea, this time with some hardware hacking: Could you just modify the power adapter in such a way that when it is connected to the load (the RPi) it slowly charges some kind of device (a capacitor?) and only after that it powers its main device (the RPi)? By delaying the reboot process the R...
by Tzarls
Wed Jan 16, 2019 12:40 am
Forum: Advanced users
Topic: Raspberry PI cold boot attack protected / Zero out RAM after boot?
Replies: 71
Views: 4859

Re: Raspberry PI cold boot attack protected / Zero out RAM after boot?

Ok, here's the solution you've been looking for, without having to redesign SOCs or spend millions. You just need to design a new case based on this guidelines: The case should be closedd and cover the SD slot with some kind of lid. When the lid is opened it activates some mechanism that moves some ...
by Tzarls
Wed Dec 26, 2018 5:42 am
Forum: Off topic discussion
Topic: Merry Xmas RasberryPi!
Replies: 21
Views: 2289

Re: Merry Xmas RasberryPi!

What are we all eating today? Well... Just came back from having a late Festivus dinner at TGI Friday's... That would be ribs for me, some chicken for the kids and lemonade and chicha morada for drinks... And yes, it's summer solstice around here. Live long and prosper, and may the schwatrz be with...
by Tzarls
Sat Nov 24, 2018 3:41 am
Forum: Off topic discussion
Topic: My 1st ever dead Pi.
Replies: 14
Views: 2656

Re: My 1st ever dead Pi.

You must have tripped your Pi's polyfuse, maybe when testing voltages. Now it has reset, that's why it is working again. I had something like this happen once to one of my Raspis, one that was doing almost nothing, just displaying photos over and over. One day it was dead. After a coupe of days it w...
by Tzarls
Thu Aug 02, 2018 5:30 am
Forum: General discussion
Topic: RPI 3B+ reports incorrect clockspeed. Video
Replies: 60
Views: 4321

Re: RPI 3B+ lies about it's clockspeed. Video

One Meg just does not cut it with modern browsers, even with all sorts of ad and script blockers and a pi-hole up front in a separate Rpi. The 3B doesn't just slow down when hot...it 'effin quits. You mean 1 Gig, right? FWIW, I have a RPi3B in an AIY Voice V1 - no heatsink, locked in a cardboard bo...
by Tzarls
Tue Jul 24, 2018 5:19 pm
Forum: Off topic discussion
Topic: What was your 1st game?
Replies: 49
Views: 17854

Re: What was your 1st game?

My first computer game must have been one called "chopper" where you controled a helicopter and had to manuever through caves and rescue people from the top of buildings. All graphics were done with text characters. As far as I remember this was on an Olivetti machine, like 200 years ago. I don't re...
by Tzarls
Fri Jun 29, 2018 9:25 pm
Forum: Beginners
Topic: virtual keyboard for touch screen?
Replies: 49
Views: 12998

Re: virtual keyboard for touch screen?

ok, I give up with Jessie Don't. For downloading I usually "cheat" - I download the package using my Windows Pc and then transfer the file to the Pi (mainly because I use Windows to browse,so it's faster that way) but you can do it that way directly from the chromium browser on the Pi. Or investiga...
by Tzarls
Fri Jun 29, 2018 5:20 am
Forum: Beginners
Topic: virtual keyboard for touch screen?
Replies: 49
Views: 12998

Re: virtual keyboard for touch screen?

I use Jessie and xvkbd and everything works ok. Now, I remember having the problem you describe (not being able to launch the keyboard again) and found that the version in the repositories apparently had a problem when shutting down. I don't remember exactly how I solved it but I think it had to do ...
by Tzarls
Sat May 26, 2018 6:51 pm
Forum: Beginners
Topic: (Solved) How to shut down a rasp you cant connect to
Replies: 9
Views: 851

Re: How to shut down a rasp you cant connect to

If you have an USB keybiard you can try the following:
1. Plug the keyboard to the Raspberry.
2. Press this combination: control alt f1
3. Write this command: sudo shutdown - h now

If this works, after a few seconds you should see the activity led blinking 10 times, which means your Raspberry is off.
by Tzarls
Wed May 02, 2018 11:06 pm
Forum: The MagPi
Topic: STICKY: Errata
Replies: 54
Views: 64234

Re: STICKY: Errata

Issue 69, page 38: For playing music using omxplayer it says to use the following:

Code: Select all

oxmplayer ~/Music/Anton_Rothschild_-_03_-_Its_Not_Vegas.mp
It should be omxplayer, not oxmplayer.
by Tzarls
Thu Mar 29, 2018 6:35 am
Forum: General discussion
Topic: How expensive does "The Pi Bug" get?
Replies: 32
Views: 2795

Re: How expensive does "The Pi Bug" get?

But what sort of sound should it make? A buzz is no good - we'd really like something that sounds like bagpipes, or maybe church bells. What makes a church bell sound like it does? So now, before we start working out the details of the project, we have to find out what it's going to do. The first t...
by Tzarls
Sun Mar 04, 2018 5:07 am
Forum: Beginners
Topic: Ultrasonic Theremin Problems
Replies: 16
Views: 1664

Re: Ultrasonic Theremin Problems

AFAIK there is a problem with the ultrasonic sensor interface in gpiozero - Basically the sensor won't detect any distance so any project based on distance will not work. I had to develop my own ultrasonic class using Pigpio to make the theremin and other projects work.
by Tzarls
Thu Feb 08, 2018 8:19 pm
Forum: Español
Topic: Raspberry Jam en Lima, Perú
Replies: 0
Views: 332

Raspberry Jam en Lima, Perú

Hola a todos. Les comento que el 3 de marzo estaremos realizando un Raspberry Jam en la ciudad de Lima, Perú, con motivo del aniversario de la Raspberry Pi. La reunión está organizada por la empresa Generación Tec en coordinación con el FabLab de la Universidad ESAN y se llevará cabo en el local de ...
by Tzarls
Mon Jan 29, 2018 6:54 pm
Forum: Camera board
Topic: Camera: Looking for a C++ library that includes encoders
Replies: 2
Views: 733

Re: Camera: Looking for a C++ library that includes encoders

Thanks, I'll have a look at the code you mention.
by Tzarls
Tue Jan 23, 2018 8:46 pm
Forum: Camera board
Topic: Camera: Looking for a C++ library that includes encoders
Replies: 2
Views: 733

Camera: Looking for a C++ library that includes encoders

Hello to all. I need to use the Raspberry Camera (V2) from C++. Not wanting to reinvent the wheel, I searched for some existing library with some kind of interface for controlling the camera and found these 2 examples: https://github.com/cedricve/raspicam http://robotblogging.blogspot.pe/2013/10/an-...

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