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by laurent
Wed Jul 10, 2019 12:15 pm
Forum: Troubleshooting
Topic: Raspberry Pi 4 temperature
Replies: 275
Views: 51621

Re: Raspberry Pi 4 temperature

I think a solution for keeping the CPU cold, while having a HAT attached, is to design a "cooling HAT" between the Pi and the "useful" HAT stacked on to ! A thin blowing fan (like on laptop ones) on the "cooling HAT" could extract the hot air above the CPU and send it to one side, allowing a lower ...
by laurent
Wed Jul 10, 2019 12:08 pm
Forum: Troubleshooting
Topic: Raspberry Pi 4 temperature
Replies: 275
Views: 51621

Re: Raspberry Pi 4 temperature

I think a solution for keeping the CPU cold, while having a HAT attached, is to design a "cooling HAT" between the Pi and the "useful" HAT stacked on to ! A thin blowing fan (like on laptop ones) on the "cooling HAT" could extract the hot air above the CPU and send it to one side, allowing a lower ...
by laurent
Wed Jul 10, 2019 8:34 am
Forum: Troubleshooting
Topic: Raspberry Pi 4 temperature
Replies: 275
Views: 51621

Re: Raspberry Pi 4 temperature

I think a solution for keeping the CPU cold, while having a HAT attached, is to design a "cooling HAT" between the Pi and the "useful" HAT stacked on to ! A thin blowing fan (like on laptop ones) on the "cooling HAT" could extract the hot air above the CPU and send it to one side, allowing a lower s...
by laurent
Fri Jul 05, 2019 2:27 pm
Forum: Français
Topic: RPI 4 2go pour cours
Replies: 13
Views: 420

Re: RPI 4 2go pour cours

Prends un 4Go si tu peux trouver les 10€. Aucun doute là dessus. Je plussoie fortement ;) Les navigateurs web sont devenus excessifs dans leurs conso en RAM et le web étant incontournable... Rajoute aussi une carte µSD rapide, genre Samsung Pro/Evo plus, Sandisk Extreme et surtout pas une basique c...
by laurent
Fri Jul 05, 2019 2:20 pm
Forum: Français
Topic: Refroidissement Raspberry Pi 4
Replies: 11
Views: 574

Re: Refroidissement Raspberry Pi 4

Je rajoute que perso, là où ça risque de m'embêter le plus, c'est pour les HAT qui gêneront la dissipation (et qui seront potentiellement gênés par la chaleur du SoC à quelques mm :cry:
by laurent
Fri Jul 05, 2019 2:17 pm
Forum: Français
Topic: Refroidissement Raspberry Pi 4
Replies: 11
Views: 574

Re: Refroidissement Raspberry Pi 4

c'est très beau mais est-ce utile ? Tu as un ventilo dans ton smartphone ? pourtant ce sont les mêmes composants. Les SoC des smartphones récents ET puissants (C'est à dire des Cortex A7x comme ceux du Pi 4 ou Snapdragon 8xx) ont souvent un process plus fin que le 28nm du Pi4, ce qui permet de cont...
by laurent
Fri Jul 05, 2019 1:11 pm
Forum: Français
Topic: RPI 4 2go pour cours
Replies: 13
Views: 420

Re: RPI 4 2go pour cours

Salut, Je t'invite à poster ta demande dans la section "Français" du forum, ou à la reformuler en Anglais ici, sinon tu ne risques pas d'avoir beaucoup de réponses ;) https://www.raspberrypi.org/forums/viewforum.php?f=65 Ceci dit, pour t'apporter une réponse, je dirais que le Rapsberry Pi 4 est bien...
by laurent
Mon Jul 01, 2019 9:00 pm
Forum: General discussion
Topic: Raspberry Pi 4 Thread - general discussion
Replies: 711
Views: 62174

Re: Raspberry Pi 4 Thread - general discussion

Many reviewers (and myself) felt the same excitement having this brand new Raspberry Pi between our hands, than the many first released in 2012. I think it's because this SBC is almost totally new, it's a fact. Give feedback and let some time for the software to follow, the best is incoming. Don't y...
by laurent
Thu Jun 27, 2019 9:21 am
Forum: General discussion
Topic: Raspberry Pi 4 Thread - general discussion
Replies: 711
Views: 62174

Re: Raspberry Pi 4 Thread - general discussion

Out of curiosity : do this new SoC integrates a RTC (with battery pin exposed) ?
It's not a request, I know it's not useful for almost users and for those who it's useful, there is plenty of third party boards out there. But sometimes it's just available on some SoC.
by laurent
Tue Jun 25, 2019 3:34 pm
Forum: General discussion
Topic: Raspberry Pi 4 Thread - general discussion
Replies: 711
Views: 62174

Re: Raspberry Pi 4 Thread - general discussion

So, not sure if this is a mistake or not. But looking at the manual for the Pi 4 i recieved today, it shows a 8GB ram variant??? Is this TRUE?? :shock: News are published so fast nowadays :lol: https://hackaday.com/2019/06/25/is-4gb-the-limit-for-the-raspberry-pi-4/ They even dared to quote Sir Gat...
by laurent
Tue Jun 25, 2019 3:04 pm
Forum: General discussion
Topic: Raspberry Pi 4 Thread - general discussion
Replies: 711
Views: 62174

Re: Raspberry Pi 4 Thread - general discussion

I'm thinking on a question right now : as its name self indicates, a HAT add-on is attached on top. But with the CPU reaching 80°C, may is there a potential problem regarding some HAT ? Will it be more safe for HAT designers to add a cutout window square above the CPU in order to let a eventual hea...
by laurent
Tue Jun 25, 2019 2:21 pm
Forum: General discussion
Topic: Raspberry Pi 4 Thread - general discussion
Replies: 711
Views: 62174

Re: Raspberry Pi 4 Thread - general discussion

I'm thinking on a question right now : as its name self indicates, a HAT add-on is attached on top. But with the CPU reaching 80°C, may is there a potential problem regarding some HAT ? Will it be more safe for HAT designers to add a cutout window square above the CPU in order to let a eventual heat...
by laurent
Tue Jun 25, 2019 9:27 am
Forum: General discussion
Topic: Raspberry Pi 4 Thread - general discussion
Replies: 711
Views: 62174

Re: Raspberry Pi 4 Thread - general discussion

Congratulations to the Pi staff for this work, and many many thanks for this brand new Pi !!! I have so many questions but I have no doubt they will find answers soon - the best is coming. :D I'm glad that so many user requests are satisfied in this new Pi, I wonder how user's feedback are took in a...
by laurent
Tue Jun 25, 2019 9:11 am
Forum: General discussion
Topic: Raspberry Pi 4 Thread - general discussion
Replies: 711
Views: 62174

Re: Raspberry Pi 4 Thread - general discussion

Functionally, eMMC is identical to SD cards (same bus protocol) it's just soldered to board, instead of being in a slot. how is soldering on flash memory a good idea? sounds horrible to me if you have to throw away your computer just because the flash chip had too many rewrites. :( It is mandatory ...
by laurent
Mon Jun 03, 2019 9:01 am
Forum: General discussion
Topic: 2cameras and 1raspberry ?
Replies: 3
Views: 204

Re: 2cameras and 1raspberry ?

Hi,
Here is my solution, using a raspberry pi zero with each CSI camera :
viewtopic.php?t=230819

More complex than using regular webcams, but very tweakable.
It works very well, although is there a huge room of improvements.
by laurent
Fri Mar 29, 2019 10:05 am
Forum: General discussion
Topic: Pi 4 questions
Replies: 166
Views: 9107

Re: Pi 4 questions

DougieLawson wrote:
Fri Mar 29, 2019 9:09 am
That's not true you can pass compiler flags to generate code for arm7, arm8 or 64-bit code for arm8.

I use that to get Hercules running faster on a 3B.
You mean that it's possible to run 64 bit ARMv8 compiled binaries on the regular Raspbian ?
by laurent
Fri Mar 29, 2019 8:34 am
Forum: General discussion
Topic: Pi 4 questions
Replies: 166
Views: 9107

Re: Pi 4 questions

As jamesh, Raspberry Pi Engineer & Forum Moderator, said recently: "Compilers. Compilers mean you really don't need to worry about the instruction set at all. So for Intel, ARM, RISC-V, the majority of people who use them don't give a flying whotsit about the ISA." In short, as long as we can rebui...
by laurent
Thu Mar 28, 2019 4:09 pm
Forum: General discussion
Topic: Pi 4 questions
Replies: 166
Views: 9107

Re: Pi 4 questions

I'm sure Pi tower's folks will add amazing features, but I just hope they will maintain compatibility and reasonable power consumption for the Pi4. I'm convinced that If moderns personal computers actually means x86/x64, its mainly thanks to compatibility. They survived along many generations of ver...
by laurent
Fri Mar 01, 2019 10:06 am
Forum: General discussion
Topic: Best way to power 4 x Raspberry Pi
Replies: 31
Views: 1206

Re: Best way to power 4 x Raspberry Pi

Using DC to DC converters sounds like a good idea to me. Do you have a recommendation for use with the Pi 3B+ computer? I successfully tested this model: https://www.banggood.com/9V-35V-To-5V-5A-25W-DC-DC-Buck-Synchronous-Rectification-Step-Down-Power-Supply-Converter-Module-p-1060637.html?rmmds=se...
by laurent
Thu Feb 28, 2019 2:54 pm
Forum: General discussion
Topic: Best way to power 4 x Raspberry Pi
Replies: 31
Views: 1206

Re: Best way to power 4 x Raspberry Pi

There are few advantages using an 12V PSU with DC-DC converters : - Good 12V/lower current PSU are cheaper and easier to find that 5V/high current - By using DC-DC converters you are not limited to 12V on your input, you can go higher, depending your DC-DC converters can accept - Eventual garbage o...
by laurent
Thu Feb 28, 2019 9:48 am
Forum: General discussion
Topic: Best way to power 4 x Raspberry Pi
Replies: 31
Views: 1206

Re: Best way to power 4 x Raspberry Pi

There are few advantages using an 12V PSU with DC-DC converters : - Good 12V/lower current PSU are cheaper and easier to find that 5V/high current - By using DC-DC converters you are not limited to 12V on your input, you can go higher, depending your DC-DC converters can accept - Eventual garbage on...
by laurent
Wed Feb 27, 2019 8:53 am
Forum: General discussion
Topic: Best way to power 4 x Raspberry Pi
Replies: 31
Views: 1206

Re: Best way to power 4 x Raspberry Pi

Hi,
I would rather use a 12V power supply with cheap DC-DC converters for each Pi.
Such rating currents at low voltages are never a good idea to deal with.
by laurent
Wed Feb 13, 2019 1:06 pm
Forum: General discussion
Topic: [Tutorial] How to plug two camera modules on a Raspberry Pi
Replies: 29
Views: 2392

Re: [Tutorial] How to plug two camera modules on a Raspberry Pi

Few words about those IR LEDs : they are 850nm wavelength, 50mA (70 mW ?).
I put a translucent sheet in front of the leds diffuse the light and avoid the beam effect.
by laurent
Wed Feb 13, 2019 12:58 pm
Forum: General discussion
Topic: [Tutorial] How to plug two camera modules on a Raspberry Pi
Replies: 29
Views: 2392

Re: [Tutorial] How to plug two camera modules on a Raspberry Pi

Update: Here comes the night vision ! Before assembly: https://i.postimg.cc/yx2tyQ6V/leds-before-assembly2.jpg https://i.postimg.cc/Mp2gcFr5/leds-before-assembly3.jpg https://i.postimg.cc/yYSw8HnW/leds-before-assembly1.jpg After being glued with hot glue: https://i.postimg.cc/jSHmy4pb/leds-glued1.j...

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