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by mahjongg
Wed Jan 17, 2018 6:55 pm
Forum: General discussion
Topic: Raspberry Pi 3 capacitor
Replies: 3
Views: 65

Re: Raspberry Pi 3 capacitor

jup, thats the 47uF 16V 1206 decoupler cap for USB. its "brother" C98 is responsible for the lower two USB ports, C97 for the upper two. this one would be my replacement if I had to replace C97 http://nl.farnell.com/kemet/c1206c476m8pactu/cap-mlcc-x5r-47uf-10v-1206/dp/1572639 its just 10V, not 16V, ...
by mahjongg
Wed Jan 17, 2018 5:02 pm
Forum: General discussion
Topic: Raspberry Pi 3 capacitor
Replies: 3
Views: 65

Re: Raspberry Pi 3 capacitor

C97 isn't in the partial schematics of the PI3, but I have some older schematics of earlier PI's, and in my schematic of the 2B C97 does appear as a (nearly) 1206 sized (3212 size) 47uF capacitor, estimated at 16Volt, for decoupling of USB ports. That is the best guess I can do. Raspberry PI hardwar...
by mahjongg
Tue Jan 16, 2018 3:41 pm
Forum: Advanced users
Topic: How far in the boot process can the camera be used?
Replies: 5
Views: 146

Re: How far in the boot process can the camera be used?

Moved to advanced users.
by mahjongg
Tue Jan 16, 2018 12:01 pm
Forum: General discussion
Topic: Raspberry PI malfunctioning. Need Help!
Replies: 2
Views: 130

Re: Raspberry PI malfunctioning. Need Help!

A comprehensive help file for booting problems can be found here: https://www.raspberrypi.org/forums/vie ... 28&t=58151.
by mahjongg
Tue Jan 16, 2018 11:50 am
Forum: Nederlands
Topic: thetering shooten via wifi
Replies: 1
Views: 31

Re: thetering shooten via wifi

De "Win 10" van een Raspberry PI is niet vergelijkbaar met een gewone vorm van Windows 10, het betreft hier Win10 for Internet of Things, die alleen de kernel met een gewone windows deelt. Er is geen enkele praktische mogelijkheid om "een gewone" windows te gebruiken op een Raspberry PI, daar deze g...
by mahjongg
Mon Jan 15, 2018 3:41 pm
Forum: Raspberry Pi Desktop for PC and Mac
Topic: Think I’ve nailed the Raspi Boot Loop bug
Replies: 13
Views: 384

Re: Think I’ve nailed the Raspi Boot Loop bug

Sometimes when using your Pi you might get caught in a boot loop. I’ve figured out what seems to be causing it. On my computer I am running Raspbian Jessie on a disk. During boot it will enter a black screen time where only a cursor is shown as it loads everything up. If nothing is pressed on the k...
by mahjongg
Mon Jan 15, 2018 10:50 am
Forum: Advanced users
Topic: Pi 3 Flask Page request from browser and python2 code.
Replies: 2
Views: 80

Re: Pi 3 Flask Page request from browser and python2 code.

Added code tags to original post.
by mahjongg
Mon Jan 15, 2018 12:51 am
Forum: Automation, sensing and robotics
Topic: weird problem: PIR sensor positive on wifi activity
Replies: 16
Views: 1855

Re: weird problem: PIR sensor positive on wifi activity

This particular PIR detector has a 3V3 push-pull compatible logic output, it does NOT have, as most PIR detectors do, have an open collector output, so it does NOT need a pullup resistor. That said the output is "short circuit" protected with a 1K resistor, so it does not have a very low output impe...
by mahjongg
Sun Jan 14, 2018 6:45 pm
Forum: General discussion
Topic: Power over HDMI
Replies: 13
Views: 23609

Re: Power over HDMI

Yes, I Have done this. I connected my Pi 3 to an HDMI to VGA connector (which needed an external 5v supply), pulled out the power supply to shut down, and the Pi continued running (which did admittedly freak me out a little). Thats strange as new PI's even use a specific IC (the RT9741CGV-ND) to bl...
by mahjongg
Sun Jan 14, 2018 6:16 pm
Forum: Beginners
Topic: Suggestion on HAT design
Replies: 6
Views: 179

Re: Suggestion on HAT design

Problem is, if that were part of the HAT spec, people would expect HATs to be stackable. In fact, boards built to the HAT spec are specifically NOT stackable (because of the EEPROM interface). I have an Adafruit TFT board with a pass-through connector, which works for me. This particular board does...
by mahjongg
Sun Jan 14, 2018 5:44 pm
Forum: Beginners
Topic: run a command on start up
Replies: 19
Views: 77085

Re: run a command on start up

hrostami wrote:
Sun Jan 14, 2018 2:24 pm
I made a video about this, a simple solution that works: https://youtu.be/Tvnrx-2QaUU
I wanted to delete 6 of Hrostami's 7 duplicate posts, I seem to have deleted all seven. Sorry.... :|
by mahjongg
Thu Jan 11, 2018 2:44 pm
Forum: General discussion
Topic: schematic diagram of raspberry pi 3 with micro sd card holder
Replies: 2
Views: 162

Re: schematic diagram of raspberry pi 3 with micro sd card holder

No raspberry PI model actually uses the switch in the sd-card holder.
Partial schematics are available on the HELP blog page.
by mahjongg
Thu Jan 11, 2018 2:33 pm
Forum: Off topic discussion
Topic: Silicon on RP zero w PCB
Replies: 8
Views: 512

Re: Silicon on RP zero w PCB

Except for some Chinese junk, which has bare die's with an epoxy blob on top, (remember the watara supervison game boy wannabe?) well I have seen epoxy blobbed dies on the head amplifiers of harddisks too, so not all epoxy blobs are per definition used on junk. also potato chips are much faster than...
by mahjongg
Thu Jan 11, 2018 12:24 pm
Forum: Raspberry Pi Desktop for PC and Mac
Topic: Jessie Lite for x86 PC
Replies: 5
Views: 146

Re: Jessie Lite for x86 PC

try debian with the raspberry PI desktop software, as explained in this sub-forum.
Raspbian doesn't run on x86 platforms, only on ARM.

Debian with the raspberry PI desktop can be downloaded here: https://www.raspberrypi.org/downloads/
by mahjongg
Wed Jan 10, 2018 12:54 am
Forum: Add-ons
Topic: Level Converters
Replies: 2
Views: 91

Re: Level Converters

Level converters of any voltage are not suitable to drive high powered devices. You will likely need a transistor circuit or relay and suitable power supply. No, the level converters you are referring to, used for I2C and such, might not be useable, but there are perfectly useable real level shifte...
by mahjongg
Wed Jan 10, 2018 12:34 am
Forum: Troubleshooting
Topic: issue when I formatted my Samsung microSDHS UHS1-Card 32GB with NOOBS
Replies: 1
Views: 57

Re: issue when I formatted my Samsung microSDHS UHS1-Card 32GB with NOOBS

start by reading the boot problem sticky. viewtopic.php?f=28&t=58151
first impression, either installing a very old version of raspbian, or power (cable) problems.
by mahjongg
Mon Jan 08, 2018 11:15 pm
Forum: Off topic discussion
Topic: Silicon on RP zero w PCB
Replies: 8
Views: 512

Re: Silicon on RP zero w PCB

"just silicon pieces"? or are they perhaps potato chips to you? :mrgreen: you are probably (because you don't identify *which* raspberry PI you mean) talking about the LAN9512 USB hub chip with built in USB-Ethernet controller, and quite possibly the switching power converter that creates 3.3V and 1...
by mahjongg
Mon Jan 08, 2018 6:39 pm
Forum: Troubleshooting
Topic: Pi detecting activity - resistor needed?
Replies: 11
Views: 267

Re: Pi detecting activity - resistor needed?

Place a 100nF capacitor between the GPIO, and GND that will filter out the high frequency pulses that your HVAC is inducing into the leads. It will also help if you twist or shield the wires. or you could run the wire a few windings through a ferrite ring core. It is also possible that your switches...
by mahjongg
Mon Jan 08, 2018 6:33 pm
Forum: Troubleshooting
Topic: Raspberry Pi 3 rainbow screen with lightening bolt
Replies: 11
Views: 310

Re: Raspberry Pi 3 rainbow screen with lightening bolt

The lightening bolt is displayed even when the dips below 4.6V are very short, too short to see with the RED LED, its exactly why the PI doesn't rely on only the power LED.
by mahjongg
Sun Jan 07, 2018 11:44 pm
Forum: Troubleshooting
Topic: Pi detecting activity - resistor needed?
Replies: 11
Views: 267

Re: Pi detecting activity - resistor needed?

if you have both a (50K) internal pullup, and a 5K external pullup, they are actually just in parallel , so the 5K becomes slightly lower, but that doesn't matter. Actually the formula for two parallel resistors is (RA*RB)/(RA+RB) so if RA=50K and RB=5K the value becomes (50*5)/(50+5) = 250/55 = 4.5...
by mahjongg
Sun Jan 07, 2018 6:39 pm
Forum: Beginners
Topic: Exagear help running an .exe
Replies: 2
Views: 119

Re: Exagear help running an .exe

note that exagear (the x86 cpu emulation process) will effectively turn the 1GHz PI processor into a 0.1GHz (or worse) x86 processor, as many ARM instructions are needed to emulate one x86 instruction. so probably your x86 code will "run" like a cold slug. your mileage may vary, but comparing the 1G...
by mahjongg
Sun Jan 07, 2018 6:24 pm
Forum: Troubleshooting
Topic: Pi detecting activity - resistor needed?
Replies: 11
Views: 267

Re: Pi detecting activity - resistor needed?

yes, you need a pullup resistor to 3.3V. I recommend a resistor between 2K2 and 10K. you are now probably running with only the built in software controlled pullup, which are very weak, something like 50K, thats only good for short (< 5cm) wires, and still, (with longer wires acting as signal pickup...
by mahjongg
Sun Jan 07, 2018 2:07 pm
Forum: General discussion
Topic: Force the 3.5mm jack to output video, not HDMI
Replies: 4
Views: 267

Re: Force the 3.5mm jack to output video, not HDMI

By default the Composite video is automatically activated if no HDMI device is detected. this is not true if you install using NOOBS, when using NOOBS it always defaults to HDMI, and you have to switch to PAL or NTSC by pressing 2 or 3 while in NOOBS, or 1 for HDMI or 2 for safe HDMI, the setting i...
by mahjongg
Sun Jan 07, 2018 1:25 pm
Forum: Beginners
Topic: 40pin PATA
Replies: 1
Views: 75

Re: 40pin PATA

yes, but don't use ones with fine pitch (80-pole) cables, see viewtopic.php?f=91&t=83372&p=651745#p665572

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