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by mikerr
Wed Sep 11, 2019 7:46 am
Forum: General discussion
Topic: Rpi686 3.0 Beta 1: A way to run x86 programs on the Pi
Replies: 7
Views: 427

Re: Rpi686 3.0 Beta 1: A way to run x86 programs on the Pi

At first glance just a script to install qemu and debootstrap ?
by mikerr
Sun Sep 08, 2019 10:50 am
Forum: Compute Module
Topic: Beginner Question on PCI use in a computer
Replies: 9
Views: 296

Re: Beginner Question on PCI use in a computer

Mount any Pi inside the case, and power it from a molex 5v ?

Nice way of mounting a Pi in a PC here:
https://hackaday.com/2018/10/05/perhaps ... e-your-pc/
or this rotated version to have the USB/ethernet on the edge
https://www.thingiverse.com/thing:3146738
by mikerr
Sat Sep 07, 2019 9:03 am
Forum: General discussion
Topic: Pi Card Imager - android app prepares SD cards without PC
Replies: 24
Views: 44451

Re: Pi Card Imager - android app prepares SD cards without PC

For NOOBS the SSH file method to enable ssh only works on the very first boot (when NOOBS system formats /creates the partitions).
by mikerr
Sat Sep 07, 2019 8:47 am
Forum: General discussion
Topic: Graph & timeline of Pi Sales
Replies: 88
Views: 26546

Re: Graph & timeline of Pi Sales

1 Million Pi 4 already

https://twitter.com/JamesAdams314/statu ... 6163611654

Launched on 24 June - so thats just 2 months (1st million Pi took a year !)
by mikerr
Tue Aug 06, 2019 7:44 pm
Forum: General discussion
Topic: May I use the RUN pin holes on Raspberry pi 3 like on/off, putting a switch?
Replies: 3
Views: 248

Re: May I use the RUN pin holes on Raspberry pi 3 like on/off, putting a switch?

As above, shorting the RUN header is a hard instant off. For a graceful shutdown/ restart, add this line in /boot/config.txt : dtoverlay=gpio-shutdown and then instead of using run, wire the pushbutton to GPIO3 (pin 5) and GND. Pressing that will shutdown the pi correctly to halt state. Another pres...
by mikerr
Tue Jul 30, 2019 10:54 am
Forum: General discussion
Topic: Raspberry Pi 4 Thread - general discussion
Replies: 861
Views: 88542

Re: Raspberry Pi 4 Thread - general discussion

Not to mention you need a computer to image your sd card +400 +/-, No PC needed to image your SD card, just use your android phone with my app : https://www.raspberrypi.org/forums/viewtopic.php?f=63&t=170856 On stuttery chrome playback, try launching chromium from the command line - hardware accele...
by mikerr
Thu Jul 04, 2019 2:14 pm
Forum: General discussion
Topic: Just received my RPi4b/4GB - no HDMI output!!!
Replies: 75
Views: 6705

Re: Just received my RPi4b/4GB - no HDMI output!!!

NOOBS currently sets some incorrect flags for HDMI1 in config.txt for the underlying OS (hdmi_force_hotplug=1). Your comment "It's a normal hdmi cable with micro hdmi adapter on it." implies you're using HDMI1 (as the blob adapters don't fit in HDMI0 as they hit the power connector). I'm confused a...
by mikerr
Thu Jul 04, 2019 11:38 am
Forum: General discussion
Topic: Just received my RPi4b/4GB - no HDMI output!!!
Replies: 75
Views: 6705

Re: Just received my RPi4b/4GB - no HDMI output!!!

6by9 wrote:
Thu Jul 04, 2019 11:25 am
Hotplug has never been supported on the Pi.
Unless you put hdmi_force_hotplug=1 in config.txt
That's usually the first thing I do.
by mikerr
Thu Jul 04, 2019 9:19 am
Forum: Raspbian
Topic: Diffenreces in Raspbians?
Replies: 4
Views: 347

Re: Diffenreces in Raspbians?

3 versions: Raspbian Lite Boots to a command line, no desktop installed 400MB download, 2.2GB installed Raspbian desktop Desktop with Chrome, VLC, Geany & Thonny. 1GB download, 3.6GB installed Raspbian full desktop & all apps Desktop with: Chrome, VLC, Geany & Thonny BlueJ, Greenfoot, Mu, Node-RED, ...
by mikerr
Thu Jul 04, 2019 8:46 am
Forum: General discussion
Topic: Raspberry Pi 4 Thread - general discussion
Replies: 861
Views: 88542

Re: Raspberry Pi 4 Thread - general discussion

What info does the qr barcode on the bottom show ?

I was hoping it was the serial number like on tinkerboard, but it doesn't seem to be:

Image
by mikerr
Tue Jul 02, 2019 8:00 pm
Forum: General discussion
Topic: Just received my RPi4b/4GB - no HDMI output!!!
Replies: 75
Views: 6705

Re: Just received my RPi4b/4GB - no HDMI output!!!

k-pi wrote:
Tue Jul 02, 2019 7:51 pm
Altered config.txt
hdmi_force_hotplug=1
hdmi_group=2

But still only getting 1024x768, every time I alter it in the Screen Layout Editor to 1366x768 & apply it, it reverts back to 1024x768!
Add
hdmi_mode=81
for 1366x768 ?
by mikerr
Tue Jul 02, 2019 7:12 pm
Forum: General discussion
Topic: Just received my RPi4b/4GB - no HDMI output!!!
Replies: 75
Views: 6705

Re: Just received my RPi4b/4GB - no HDMI output!!!

Hdmi-safe does force-hotplug and more,
including setting a low resolution as you've found.

https://www.raspberrypi.org/documentati ... t/video.md

Is that the official PSU, or a capable one ?
The pi4 draws alot more power than the pi3, and peaks just after the logo....
by mikerr
Tue Jul 02, 2019 6:40 pm
Forum: General discussion
Topic: Just received my RPi4b/4GB - no HDMI output!!!
Replies: 75
Views: 6705

Re: Just received my RPi4b/4GB - no HDMI output!!!

So, just tried powering up the monitor & then the RPi4B once the monitor is on, separately like we used to have to do, & still no HDMI output. If you put this line in config.txt hdmi_force_hotplug=1 it won't matter which order you power or connect screen & pi. Worth doing if you're getting blank/no...
by mikerr
Sat Jun 29, 2019 12:04 pm
Forum: General discussion
Topic: Power Raspberry Pi 4 via 40 pin connector?
Replies: 13
Views: 1534

Re: Power Raspberry Pi 4 via 40 pin connector?

Yes, just be aware the pi4 draws quite a bit more than previous models
https://raspi.tv/2019/how-much-power-do ... asurements
by mikerr
Fri Jun 28, 2019 4:24 pm
Forum: General discussion
Topic: PI4 identify 1,2 or 4GB version
Replies: 4
Views: 1180

Re: PI4 identify 1,2 or 4GB version

Looking at the pi4 board itself, there's only the RAM chip number to go on:

Image

4GB : D9WHV (M - micron logo)

2GB: D9WHZ (M - micron logo)

1GB: 4HBMGCJ ( + QR code)
by mikerr
Fri Jun 28, 2019 2:21 pm
Forum: General discussion
Topic: Very simple OTG on pi4
Replies: 8
Views: 2377

Very simple OTG on pi4

I've found OTG is really simple and useful on the pi4 with new firmware. Since the USB-C power port can now carry data, you can plug that into a USB port on your PC and access the Pi via a drive letter. https://i.imgur.com/FxFQrybm.png https://i.imgur.com/vj802kAt.png Here's how: 1. Add a single lin...
by mikerr
Wed Jun 26, 2019 3:35 pm
Forum: General discussion
Topic: (again) Raspberry Pi sleep/standby modes software support
Replies: 8
Views: 725

Re: (again) Raspberry Pi sleep/standby modes software support

Some more info in this thread:
https://www.raspberrypi.org/forums/view ... 3&t=243421
but although the pi4 is better than previous models - it shuts down to 20 mA - there is no standby/sleep as yet.
by mikerr
Wed Jun 26, 2019 9:52 am
Forum: General discussion
Topic: Raspberry Pi 4 - Sleep Mode
Replies: 8
Views: 3118

Re: Raspberry Pi 4 - Sleep Mode

Other Pi models continue to draw a high ~100mA in shutdown/halt. There is a minor mod to the 3B+ to get 11mA in shutdown state https://www.raspberrypi.org/forums/viewtopic.php?f=63&t=207961&p=1287499#p1286828 but that doesn't work on the 4B The 4B by default shuts down to a decent 20mA draw When the...
by mikerr
Tue Jun 25, 2019 4:06 pm
Forum: General discussion
Topic: A Pi Pie Chart
Replies: 112
Views: 11621

Re: A Pi Pie Chart

Asus Tinkerboard gcc --version gcc (Debian 6.3.0-18+deb9u1) 6.3.0 20170516 ./pichart-openmp -t "Asus Tinkerboard" pichart -- Raspberry Pi Performance OPENMP version 30 Prime Sieve P=14630843 Workers=4 Sec=0.907341 Mops=1029.74 Merge Sort N=16777216 Workers=8 Sec=0.80095 Mops=502.72 Fourier Transform...
by mikerr
Tue Jun 25, 2019 3:41 pm
Forum: General discussion
Topic: PI4 identify 1,2 or 4GB version
Replies: 4
Views: 1180

Re: PI4 identify 1,2 or 4GB version

Oops on my 4GB pi 4B vcgencmd get_mem arm arm=948M So better use meminfo or free -h grep MemTotal /proc/meminfo MemTotal: 3999792 kB free -h total used free shared buff/cache available Mem: 3.8Gi 93Mi 3.6Gi 9.0Mi 100Mi 3.6Gi Swap: 99Mi 0B 99Mi
by mikerr
Tue Jun 25, 2019 2:55 pm
Forum: General discussion
Topic: A Pi Pie Chart
Replies: 112
Views: 11621

Re: A Pi Pie Chart

Pi4B results (Just with raspbian's preinstalled gcc) gcc --version gcc (Raspbian 8.3.0-6+rpi1) 8.3.0 make gcc -std=gnu99 -O3 -mtune=native -march=native -Wall -o pichart-serial pichart.c util.c sieve.c merge.c fourier.c lorenz.c -lm gcc -std=gnu99 -O3 -mtune=native -march=native -Wall -fopenmp -o pi...
by mikerr
Tue Jun 25, 2019 2:39 pm
Forum: General discussion
Topic: Pi4 Sysbench results
Replies: 14
Views: 1959

Pi4 Sysbench results

I previously ran sysbench to compare Pi3B and Asus Tinkerboard, so added pi4 to the mix: sysbench --num-threads=4 --test=cpu --cpu-max-prime=20000 --validate run Number of threads: 4 Pi 3B total time: 129.6265s per-request statistics: min: 47.69ms avg: 48.12ms Asus Tinkerboard total time: 82.5418s p...
by mikerr
Tue Jun 25, 2019 12:07 pm
Forum: General discussion
Topic: Raspberry Pi 4 Thread - general discussion
Replies: 861
Views: 88542

Re: Raspberry Pi 4 Thread - general discussion

Have my hands on a pi4 now - yay ! So onto some quick power draw tests Idling on raspbian desktop: 562 mA 4 cores in use * 1005 mA Shutdown with sudo shutdown -h 20 mA *Quick way to busy the 4 cores: cat /dev/zero >/dev/null & cat /dev/zero >/dev/null & cat /dev/zero >/dev/null & cat /dev/zero >/dev...
by mikerr
Mon Jun 24, 2019 9:46 am
Forum: Teaching and learning resources
Topic: Scratch 3.0 please fix it NOW
Replies: 38
Views: 6758

Re: Scratch 3.0 please fix it NOW

Fixed in buster (and mods probably had to bite their tongue before release)
by mikerr
Mon Jun 24, 2019 9:23 am
Forum: General discussion
Topic: Raspberry Pi 4 Thread - general discussion
Replies: 861
Views: 88542

Re: Raspberry Pi 4 Thread - general discussion

Fantastic news, got my 4GB order in earlier ! Looks like everything I wanted is there: - Faster CPU - Proper gigabit ethernet - USB3 - Oodles of RAM - Buster Struggling to find minor cons, but: - No IR (but cheap to add on) - No SATA ( USB3 - SATA is cheap though) - Single CSI (so compute module sti...

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