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by MaitreDede
Thu Nov 23, 2017 10:50 pm
Forum: HATs and other add-ons
Topic: Multiple power sources for pi 3 or 0
Replies: 14
Views: 2981

Re: Multiple power sources for pi 3 or 0

What do you mean by "fail" ? Not powering the pi zero at all ? Not recognizing the pi zero as gadget ? I have understood that the data pin of the "power" usb port of pi 0 are unconnected. Only the pins of "usb" usb port are. So I don't see which kind of failure it can be. And yes, in daily usage, my...
by MaitreDede
Thu Nov 23, 2017 10:10 pm
Forum: Advanced users
Topic: [SOLVED] Determining state of USB OTG-ID signal on Zero
Replies: 5
Views: 1744

Re: [SOLVED] Determining state of USB OTG-ID signal on Zero

I think it will not be easy to test it with pi zero, due to powering issues. You can power it only by one usb port (or you take the risk to burn your usb ports), or gpio pins (again, without usb, or you may see smoke). I am dealing with this question here : https://www.raspberrypi.org/forums/viewtop...
by MaitreDede
Thu Nov 23, 2017 10:09 pm
Forum: HATs and other add-ons
Topic: Multiple power sources for pi 3 or 0
Replies: 14
Views: 2981

Re: Multiple power sources for pi 3 or 0

A last question...

Should I consider "safe" to plug the 2 micro-usb if they are plugged on two "near" usb ports, for example, on a desktop computer, on the back, 2 usb ports one on top of other directly on the motherboard, like http://techreport.com/r.x/intel-z77-qui ... -ports.jpg ?
by MaitreDede
Thu Nov 23, 2017 7:42 pm
Forum: HATs and other add-ons
Topic: Multiple power sources for pi 3 or 0
Replies: 14
Views: 2981

Re: Multiple power sources for pi 3 or 0

On the Pi 3B (and most other models) is a circuit called an "Ideal Diode". The Pi Zero doesn't have one of these Thanks, so I will avoid smoke in my room :lol: So to power the pi zero, I will have to insert an "ideal diode" on both usb ports, and also on gpio. There is still the question of the del...
by MaitreDede
Thu Nov 23, 2017 3:04 am
Forum: HATs and other add-ons
Topic: Multiple power sources for pi 3 or 0
Replies: 14
Views: 2981

Re: Multiple power sources for pi 3 or 0

No. I explain ;) You have power given from two sources, each behind its own safety diode. Let's say that P1 provides 4.9V, and P2 5.1V. Due to the safety diodes, all current is drawn from P2. If I unplug P2, there will be a small time where there will be no power at all, the time needed for the safe...
by MaitreDede
Thu Nov 23, 2017 1:02 am
Forum: HATs and other add-ons
Topic: Multiple power sources for pi 3 or 0
Replies: 14
Views: 2981

Re: Multiple power sources for pi 3 or 0

My understanding on the matter is that it is possible, but you'll have no control over how the power is drawn. For the beginning, I don't need such control. I only need that if a power source is unplugged, the "recovery time" for safety diodes to let power flow from an other power source is handled...
by MaitreDede
Thu Nov 23, 2017 12:49 am
Forum: Advanced users
Topic: [SOLVED] Determining state of USB OTG-ID signal on Zero
Replies: 5
Views: 1744

Re: [SOLVED] Determining state of USB OTG-ID signal on Zero

Hi, The hprt0 does not exists on my pi zero w with latest raspbian version (stretch). I configured my gadget using "libcomposite", following http://isticktoit.net/?p=1383 . It seams that some info are available here : tree /sys/devices/platform/soc/20980000.usb/udc/20980000.usb /sys/devices/platform...
by MaitreDede
Thu Nov 23, 2017 12:04 am
Forum: HATs and other add-ons
Topic: Multiple power sources for pi 3 or 0
Replies: 14
Views: 2981

Re: Multiple power sources for pi 3 or 0

Thanks for your help :) Keyword "load balancing" does not help me, too much "web server" stuff :p But to sum up, if i would like to plug many power sources to same pi, I can plug one source to the micro-usb usb port (only one for pi zero), and other power sources with the safety diode circuit (from ...
by MaitreDede
Wed Nov 22, 2017 11:07 pm
Forum: HATs and other add-ons
Topic: Multiple power sources for pi 3 or 0
Replies: 14
Views: 2981

Multiple power sources for pi 3 or 0

Hi, I would like to know if I can plug multiple power sources to the same board. Before saying "no", please read the post :) I read the hat design guide, it gives info on backpowering the pi : https://github.com/raspberrypi/hats/blob/master/designguide.md#back-powering-the-pi-via-the-j8-gpio-header ...
by MaitreDede
Fri Jul 28, 2017 3:14 am
Forum: HATs and other add-ons
Topic: DSLR PoE shield
Replies: 2
Views: 1187

Re: DSLR PoE shield

Hi,
I am interested in powering the Pi 3 using PoE. Can you give us more informations, like how much power can be provided to the pi, where to buy the board, schematics (if any), tutorial, if exists a version with only the circuits for powering the pi...
Thanks.
by MaitreDede
Fri Jun 02, 2017 7:25 am
Forum: General discussion
Topic: Need large touch screen monitor for pi3B
Replies: 6
Views: 11596

Re: Need large touch screen monitor for pi3B

Hi,

I am also interested in adding a big (22"+) touch screen to a pi, that works (almost) out-of-the-box, preferably on USB, as a real touch device (not a mouse emulation).

Any advice ?

Thanks :)
by MaitreDede
Sun Jul 10, 2016 9:44 pm
Forum: Official Foundation Display
Topic: Dual display with QT / QT WebEngine
Replies: 2
Views: 2372

Re: Dual display with QT / QT WebEngine

Hi,

Do you have a guide/howto/sample to test it please ? :)

I would like to see if I can play with it on a vanilla Raspberry Pi. The furthest I have gone is by following https://wiki.qt.io/RaspberryPi2EGLFS
by MaitreDede
Tue Jul 05, 2016 12:11 am
Forum: C/C++
Topic: compile Chromium Embedded Framework
Replies: 4
Views: 3616

Re: compile Chromium Embedded Framework

Hi,

Did you managed to compile and run CEF already ?
by MaitreDede
Mon May 09, 2016 10:51 am
Forum: Official Foundation Display
Topic: rpi-backlight: Control over display brightness and power
Replies: 25
Views: 15838

Re: rpi-backlight: Control over display brightness and power

How to check (with my eyes or by software) the generation board I have ?
by MaitreDede
Thu Mar 24, 2016 9:24 pm
Forum: C/C++
Topic: Daemon displaying a web page on other screen
Replies: 6
Views: 2087

Re: Daemon displaying a web page on other screen

Ok, but how do I combine everything in a single application ?

Kivy looks like a good start, but can it handle both screens in the same app ?
And does it have a webbrowser component ? (just found code for android webview)
by MaitreDede
Tue Mar 15, 2016 8:38 pm
Forum: C/C++
Topic: Daemon displaying a web page on other screen
Replies: 6
Views: 2087

Re: Daemon displaying a web page on other screen

Yes, the official screen and a HDMI screen.
But the RPi may not have X running to display on the secondary screen (HDMI) to display content. So that is why i said "daemon".
by MaitreDede
Tue Mar 15, 2016 2:17 am
Forum: C/C++
Topic: Daemon displaying a web page on other screen
Replies: 6
Views: 2087

Daemon displaying a web page on other screen

Hi, I would like create a daemon that can display rich web content (animations, videos... just an embedded browser) on a secondary screen. Typical usage : a kiosk with a main touch screen, and a secondary hdmi TV displaying ads. I wrote daemon because it should run event in headless configurations. ...
by MaitreDede
Wed Sep 16, 2015 11:03 am
Forum: Windows 10 for IoT
Topic: Change Voice Langage Speech Synthesis
Replies: 4
Views: 1755

Re: Change Voice Langage Speech Synthesis

Hi,

Copied files, registry keys are present, but voices not in the SpeechSynthesizer.AllVoices list...
Any ideas ? (maybe it is hard-coded :lol: )

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