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by mahjongg
Tue Dec 12, 2017 11:24 pm
Forum: Français
Topic: erreur clearlookspix
Replies: 1
Views: 47

Re: erreur clearlookspix

demander au forum exagear ...
ici: http://forum.eltechs.com
by mahjongg
Tue Dec 12, 2017 11:11 pm
Forum: Troubleshooting
Topic: How big is Rasbian supposed to be?
Replies: 7
Views: 158

Re: How big is Rasbian supposed to be?

some buggy unzippers report an impossibly large file to unzip, it just buggy software. Use a better unzipper.
by mahjongg
Tue Dec 12, 2017 8:44 pm
Forum: Troubleshooting
Topic: Cannot log in
Replies: 7
Views: 141

Re: Cannot log in

Seems like Raspbian is crashing when you log in.
Probably you have either a corrupted file system, or a bad SD-card.
by mahjongg
Tue Dec 12, 2017 8:37 pm
Forum: General discussion
Topic: camera
Replies: 6
Views: 187

Re: camera

check the camera cable is it inserted correctly in the connector. Are the traces on the flexible PCB cable on the side of the contacts in the connector, so they actually make contact. Also, press on the small connector that connects the camera module to the camera board, to see if it is seated corre...
by mahjongg
Tue Dec 12, 2017 8:30 pm
Forum: Troubleshooting
Topic: Is my SD card now totally wrecked?
Replies: 9
Views: 253

Re: Is my SD card now totally wrecked?

The "officially recommended" solution would be to try to format the card with the only officially recommended formatter, one that normally will remove all partitions on the card, (something that simple formatters often fail to do) the SD associations SD-card formatter, you can download it here: http...
by mahjongg
Tue Dec 12, 2017 8:15 pm
Forum: Beginners
Topic: Connecting Relay with Pi
Replies: 14
Views: 266

Re: Connecting Relay with Pi

Read this before trying to get your relay board to work, it tells you which pitfalls to avoid:
viewtopic.php?f=91&t=83372&p=1225448#p1225448
by mahjongg
Tue Dec 12, 2017 6:31 pm
Forum: Troubleshooting
Topic: Run/Reset pins will reset the Pi if I close solenoid valves.
Replies: 23
Views: 728

Re: Run/Reset pins will reset the Pi if I close solenoid valves.

Almost nobody ever uses these pins, IMHO soldering on a header should not void your warranty, when done competently, but that is not an official opinion just my own. ask your re-seller if he will take back the PI under guarantee with RUN header added. An alternative solution would be springy pins (t...
by mahjongg
Mon Dec 11, 2017 8:44 pm
Forum: Troubleshooting
Topic: I can't start my Raspberry Pi 3 B
Replies: 9
Views: 246

Re: I can't start my Raspberry Pi 3 B

A simple question: can I use a simple formatter (e.g. that of windows) to format the SD card as FAT32? Or I need the official SD-card formatter by force? Thanks if you want to use noobs you MUST format used cards with the official formatter, other formatters do not remove all partitions of the card...
by mahjongg
Mon Dec 11, 2017 12:57 am
Forum: The Pi Store
Topic: Are you looking for "the pi store" ? , I was and here is where
Replies: 7
Views: 345

Re: Are you looking for "the pi store" ? , I was and here is where

True the PI store has been defunct for years, and the raspberry PI foundation has gone back to the proven old ways of distributing software, of having an "install new software menu", which most Linux systems have. No reason to mimic the tablet way of having a "software store". underlaying the "softw...
by mahjongg
Sun Dec 10, 2017 3:56 pm
Forum: Beginners
Topic: GPIO Pin Numbering
Replies: 21
Views: 775

Re: GPIO Pin Numbering

NO :!:
power pins on the GPIO header are *outputs*, the only real power input is the (5 Volt) micro-USB input.
3V3 is made by the PI, and the 5V is simply the 5V from the micro-USB input *after* passing the polyfuse (except on the RPI zero (w) which has no polyfuse).
by mahjongg
Sun Dec 10, 2017 2:56 pm
Forum: Troubleshooting
Topic: I can't start my Raspberry Pi 3 B
Replies: 9
Views: 246

Re: I can't start my Raspberry Pi 3 B

your mistake is that you formatted the card with NTSC (and with the wrong program) you should have formatted the card with the official SD-card formatter, as that be found here: https://www.sdcard.org/downloads/formatter_4/ . This formatter only knows about FAT32 (unless you try to use a card larger...
by mahjongg
Sun Dec 10, 2017 12:04 am
Forum: Troubleshooting
Topic: Run/Reset pins will reset the Pi if I close solenoid valves.
Replies: 23
Views: 728

Re: Run/Reset pins will reset the Pi if I close solenoid valves.

yes, the only thing that is necessary is to keep the leads to the RUN pin as short as possible, no longer than a centimeter, as yes the RUN pin is quite high impedance and so is sensitive and you cannot really do much about that.
by mahjongg
Sat Dec 09, 2017 11:57 pm
Forum: Advanced users
Topic: High pitched noise when fading LED's via PWM
Replies: 4
Views: 168

Re: High pitched noise when fading LED's via PWM

MOSFET gates should not put a load on your GPIO pins (unless the gates are zener protected, and the zener voltage is actually below 3.3V, but that is a long stretch). You can test that by placing a say 10K resistor in series with the GPIO wires running to the gates. so with no load on the GPIO's the...
by mahjongg
Sat Dec 09, 2017 3:51 pm
Forum: Troubleshooting
Topic: Pi zero w totally dead?
Replies: 8
Views: 300

Re: Pi zero w totally dead?

its not worth it, and you have to remove the original regulator as you cannot simply place a voltage at its output, you will destroy it if you try.
buy another pi zero w.
by mahjongg
Sat Dec 09, 2017 1:56 am
Forum: Troubleshooting
Topic: How to check SDCard
Replies: 3
Views: 153

Re: How to check SDCard

if when switching with an identical PI, the same sd-card doesn't boot, and you are using the same supply, then the non booting PI is dead.
by mahjongg
Sat Dec 09, 2017 1:53 am
Forum: Troubleshooting
Topic: No power light; voltage on board low; chip hot
Replies: 4
Views: 170

Re: No power light; voltage on board low; chip hot

yes, encasing the PI in a (plastic) case is an efficient way to protect it against static discharge, it the most important reason for such a case, even though people don't realise it. Zapping your PI doesn't mean your camera module is also damaged, just try. just touching a grounded piece of metal a...
by mahjongg
Fri Dec 08, 2017 6:54 pm
Forum: General discussion
Topic: Should I move to Ubuntu
Replies: 10
Views: 433

Re: Should I move to Ubuntu

In general switching to Ubuntu because you are more familiar with it is a bad idea! In practice both are simply derived from Debian, so both can (when adding the needed desktop libraries) generally use the same software, but on a PI Raspbian is simply much better supported than Ubuntu, and you will...
by mahjongg
Fri Dec 08, 2017 6:47 pm
Forum: Beginners
Topic: Safety Instructions
Replies: 18
Views: 622

Re: Safety Instructions

If its freezing outside, and the air is very dry, walking over a carpet might induce enough static electricity that afterwards when you touch a raspberry PI there is a chance you will zap the PI with fatal consequences. Other than that, except when causing a short when you do so, or when you happen ...
by mahjongg
Fri Dec 08, 2017 6:35 pm
Forum: Troubleshooting
Topic: No power light; voltage on board low; chip hot
Replies: 4
Views: 170

Re: No power light; voltage on board low; chip hot

Either you zapped the PI with static electricity, or you applied more than 4 Volt to a GPIO pin, the PI's GPIO pins are NOT 5Volt tolerant, and applying to much voltage to one of them can cause "latch up" which burns up the GPIO driving logic, causing an internal short in the chip that can spread. S...
by mahjongg
Fri Dec 08, 2017 12:24 pm
Forum: Troubleshooting
Topic: How to check SDCard
Replies: 3
Views: 153

Re: How to check SDCard

Read the boot problem sticky!
by mahjongg
Fri Dec 08, 2017 12:31 am
Forum: Troubleshooting
Topic: Run/Reset pins will reset the Pi if I close solenoid valves.
Replies: 23
Views: 728

Re: Run/Reset pins will reset the Pi if I close solenoid valves.

the schematic of the RPI3 is here: https://www.raspberrypi.org/documentation/hardware/raspberrypi/schematics/Raspberry-Pi-3B-V1.2-Schematics.pdf it contains the reset (RUN) circuit. see the middle part, and the circuit to the left of it. In short after the 1V8 power has some up, the 5VCore voltage i...
by mahjongg
Wed Dec 06, 2017 2:12 pm
Forum: General discussion
Topic: 3V3 rise time
Replies: 21
Views: 674

Re: 3V3 rise time

Well, we answered the Original Posters question, if the startup of the 3V3 regulator has a better startup response than 4.5V per millisecond for his projects use. It indeed does (provided the 5V power supply does). As for the assumption you made, that for the SD-card card this power-up is "chaos" . ...
by mahjongg
Tue Dec 05, 2017 10:55 pm
Forum: General discussion
Topic: 3V3 rise time
Replies: 21
Views: 674

Re: 3V3 rise time

mahjongg, It is indeed a bit strange that the 3V3 voltage seems to starts rising *before* the 5V arrives, in fact that is impossible No it does not do the impossible (that would be impossible:)) The yellow trace is the 5v rail. We can tell because it ends up at 5v up from zero. See how it says "2.0...
by mahjongg
Tue Dec 05, 2017 6:00 pm
Forum: General discussion
Topic: 3V3 rise time
Replies: 21
Views: 674

Re: 3V3 rise time

That explains why the 3V3 steps are synchronous with the 5V steps.
by mahjongg
Tue Dec 05, 2017 5:10 pm
Forum: General discussion
Topic: LedEdit
Replies: 1
Views: 105

Re: LedEdit

Exagear is an x86 (intel CPU) emulator, (so you can run x86 versions of Linux, or DOS) having it doesn't automatically imply you can run windows application on your PI! Use the exagear forum for information, http://forum.eltechs.com/viewforum.php?f=4&sid=89d32b99fd611ee2509d6e85428b1bd1 Unfortunatel...

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