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by mahjongg
Fri Jun 22, 2018 5:33 pm
Forum: General discussion
Topic: Pi is too fragile
Replies: 12
Views: 618

Re: Pi is too fragile

Note that on raspberry PI Zero's, all soldering is done only on the top, in a reflow oven, that is also true for the micro-USB connectors, they are surface mount ONLY, so yes its more difficult to solder them mechanically strong that way. Normally these connectors have metal pins protruding into the...
by mahjongg
Fri Jun 22, 2018 9:27 am
Forum: Troubleshooting
Topic: Pi3 hanging at rainbow screen
Replies: 34
Views: 23593

Re: Pi3 hanging at rainbow screen

i'll have to get a new charger with at least 6 V NO! :o :o :( Do NOT attempt a PSU with a higher voltage than 5.25V, with 6V you will trigger the PI's overvoltage protector, which will short the PI, and blow its fuse. If a 5V 2.1A supply gives you undervoltage warnings in 99% of the time its just t...
by mahjongg
Wed Jun 20, 2018 4:49 pm
Forum: General discussion
Topic: Be careful with Pi Zero and CSI slot
Replies: 34
Views: 6796

Re: Be careful with Pi Zero and CSI slot

I have a handful of these now where the connector tab broke off, very frustrating. Anyone know where to buy the connectors? I will try replacing the tab and then glue it in. According to the Raspberry PI Zero's partial schematic it this Molex connector (54548-2271) https://www.molex.com/molex/produ...
by mahjongg
Wed Jun 20, 2018 4:27 pm
Forum: Beginners
Topic: [Answered] RPI 3B+ how to stop Chrome from using 100% CPU
Replies: 6
Views: 171

Re: RPI 3B+ how to stop Chrome from using 100% CPU

You might try to turn on ZRAM, which I hear fixes most low on memory problems. Read: https://www.raspberrypi.org/forums/viewtopic.php?f=62&t=169608&start=50#p1132412 a process (like a browser) suddenly becoming slow points to a system that started swapping RAM to storage (and back) because of using ...
by mahjongg
Tue Jun 19, 2018 11:22 am
Forum: Android
Topic: Android with Wiringpi Library on RPi
Replies: 1
Views: 127

Re: Android with Wiringpi Library on RPi

We don't support android, there is no working android for the PI.

please go to android on pi support groups, for support.

viewtopic.php?f=73&t=71658
by mahjongg
Mon Jun 18, 2018 10:33 am
Forum: Beginners
Topic: New to Raspberry pi, what do I need to know to start a project?
Replies: 9
Views: 335

Re: New to Raspberry pi, what do I need to know to start a project?

If you are going to do any "physical computing" (i.e. using the GPIO's), there is one rule you SHOULD know, and that is that the PI's GPIO pins are not 5V tolerant! You should not put any voltages greater than 4 Volt on any GPIO pin ever! Failure to comply to this might instantly and irreparably des...
by mahjongg
Mon Jun 18, 2018 10:30 am
Forum: General discussion
Topic: Max Amps?
Replies: 10
Views: 288

Re: Max Amps?

Not really, if your power supply peaks above 5.25V, it may damage any USB devices connected to it.

IMHO this supply is not suitable, because of this.

the official PSU is cheap enough not to risk this.
by mahjongg
Mon Jun 18, 2018 10:27 am
Forum: Interfacing (DSI, CSI, I2C, etc.)
Topic: GPIO connector to feed power?
Replies: 4
Views: 152

Re: GPIO connector to feed power?

Yes, you can, but you would be bypassing the polyfuse in the PI, so you have no protection against a short on your PI, no protection against overvoltages (as the protection diode cannot blow the fuse), and you also loose protection against connection faults (reversing 5V and GND, will blow up your P...
by mahjongg
Mon Jun 18, 2018 10:21 am
Forum: Troubleshooting
Topic: Reading 4 Analog ultrasonic sensors with MCP 3008
Replies: 8
Views: 175

Re: Analog sensor with MCP 3008 output 0

Split off from original thread, as this was a hijack, and added code tags.
by mahjongg
Sat Jun 16, 2018 2:39 pm
Forum: Beginners
Topic: Is it possible to compile this code for the Pi if it was intended for different processor architecture?
Replies: 8
Views: 395

Re: Is it possible to compile this code for the Pi if it was intended for different processor architecture?

its often NOT the type of CPU that is the problem, its the type of platform the code expects to be running on. if the code expects certain hardware aspects to exists with certain closely defined aspects, be it interrupt handling, or timers, or DMA or other system specifics then if the other system d...
by mahjongg
Thu Jun 14, 2018 9:17 pm
Forum: General discussion
Topic: Getting RPi. Python script to run 24/7 without laptop turned on
Replies: 69
Views: 1773

Re: Getting RPi. Python script to run 24/7 without laptop turned on

n67 & Heater could you move your systemd discussion elsewhere (to one of the places where this is discussed religiously, I understand there are many of those) :mrgreen: ? its becoming extremely tiresome hearing about why systemd is "evil" all the time. people are starting to (rightfully) complain ab...
by mahjongg
Thu Jun 14, 2018 12:19 pm
Forum: Other
Topic: Pls help with latest linux headers 4.4.48 for kali linux.
Replies: 5
Views: 311

Re: Pls help with headers

Please keep the conversations civil, and yes, we do support other linux distro's here, besides Raspbian, as long as they run on the raspberry PI, even kali linux, as there are legal uses for it.
by mahjongg
Thu Jun 14, 2018 11:23 am
Forum: Camera board
Topic: Two applications using the camera
Replies: 6
Views: 306

Re: Two applications using the camera

No, not at the same time. But I think that if one application stops using the camera, and relinquishes its use of the camera, that then another application can use the camera afterwards. Its not as if somehow the camera knows it should only work with the first application that uses it. I don't know ...
by mahjongg
Wed Jun 13, 2018 3:30 pm
Forum: Raspbian
Topic: Voltage normalised (0x00000000)
Replies: 40
Views: 1467

Re: Voltage normalised (0x00000000)

Perhaps the next Pi should include pads we can solder to so as to completely avoid the micro USB port, while still retaining the polyfuse protection. Actually these solder pads do already exists, in the form of the test pads PP2 and PP3, see this schematic part of the published (abbreviated) schema...
by mahjongg
Wed Jun 13, 2018 1:44 pm
Forum: General discussion
Topic: What is configuration of wiring connection use db9 serial port from output device to RPi 3 by IDC10 head connector
Replies: 5
Views: 198

Re: What is configuration of wiring connection use db9 serial port from output device to RPi 3 by IDC10 head connector

What you have is the backplate of a PC slot, there is no equivalent for that on a PI, and the PI has no RS232 serial I/O. It only has a USART, which creates logic level (3.3V levels) serial signals, these must be converted to RS232 levels (plus and minus 10 to 15 volt) using a "serial driver/receive...
by mahjongg
Wed Jun 13, 2018 12:17 pm
Forum: Raspbian
Topic: Voltage normalised (0x00000000)
Replies: 40
Views: 1467

Re: Voltage normalised (0x00000000)

I disagree about barrel connectors not being appropriate for use because there is an awful lot of consumer and professional equipment out there which continues to use those in high current applications which one would expect they would not do if they were not suitable, were as appalling as some sug...
by mahjongg
Tue Jun 12, 2018 5:27 pm
Forum: General discussion
Topic: Cant Install CharlesProxy Raspbian
Replies: 1
Views: 69

Re: Cant Install CharlesProxy Raspbian

It seems you are trying to install/execute an x86 (intel/AMD) binary. That is not possible on the ARM based raspberry PI.
by mahjongg
Tue Jun 12, 2018 2:36 pm
Forum: Troubleshooting
Topic: Solid Red Light, no boot, please help
Replies: 14
Views: 345

Re: Solid Red Light, no boot, please help

Sorry, should have split off the post from "msarm" as a hijack attempt.
He probably thought that just because he also had a "solid red light, no boot problem", he could hijack your thread.

I could split this thread in two, but I fear it would only lead to more confusion....
by mahjongg
Tue Jun 12, 2018 12:21 pm
Forum: Raspbian
Topic: Voltage normalised (0x00000000)
Replies: 40
Views: 1467

Re: Voltage normalised (0x00000000)

Well my power cable is short, is a crap, could be, but if usb cables are crap, why you don't power de raspberry by a standard connector. Could be users don't will find that kinf of issues... WHY? Because its simply the best solution, if you want a power supply that directly delivers the 5V, +-5% th...
by mahjongg
Mon Jun 11, 2018 2:22 pm
Forum: General discussion
Topic: How do I edit my post?
Replies: 13
Views: 383

Re: How do I edit my post?

Well, it could be that a quite recent (in relative terms) BBS overhaul has changed this edit blocking behavior, that would explain it.
by mahjongg
Mon Jun 11, 2018 11:27 am
Forum: General discussion
Topic: How do I edit my post?
Replies: 13
Views: 383

Re: How do I edit my post?

If you hover your mouse over the pencil you will see "edit" lighting up.

I think editing a post that is already replied to is not allowed for regular users, so try it with a fresh post.
by mahjongg
Mon Jun 11, 2018 9:32 am
Forum: General discussion
Topic: 32 gb sd card not working
Replies: 4
Views: 151

Re: 32 gb sd card not working

+1

Use the etcher program to image the card with raspbian, and you do not have to format the card before you do, and etcher also accepts images as .zips, and unzips them all by itself.

32GB cards should be no problem at all.
by mahjongg
Mon Jun 11, 2018 9:21 am
Forum: Gaming
Topic: Can't add roms to sd card because formatting will delete everything!
Replies: 4
Views: 401

Re: Can't add roms to sd card because formatting will delete everything!

Create an empty memory stick (USB thumb drive) formatted as FAT32 with a single directory in it called retropie. Stick it in a booted up PI running retropie, and wait a minute or so, then take it out (no need to eject the memory stick) and have a look at it on your PC/Mac. The retropie directory sho...
by mahjongg
Mon Jun 11, 2018 9:04 am
Forum: Graphics, sound and multimedia
Topic: How do I add a headphone jack?
Replies: 16
Views: 634

Re: How do I add a headphone jack?

I agree with the above (+1)

If L- and L+ are not combine-able, use separate switched jacks for left and right, instead of trying to combine them into a stereo jack.
by mahjongg
Sun Jun 10, 2018 10:14 pm
Forum: Troubleshooting
Topic: Solid red light, no green ACT
Replies: 7
Views: 263

Re: Solid red light, no green ACT

Are these problems only ever related to the SD card interaction? YES, although in rare cases if the power supply/cable/polyfuse doesn't deliver enough power so that the PI crashes in the first second of the booting process, before the PI's GPU has a chance to boot, that can be an issue too. Its the...

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